ASTM B446-23

Standard Specification for Nickel-Chromium-Molybdenum-Niobium Alloy, Nickel-Chromium-Molybdenum-Silicon Alloy, and Nickel-Chromium-Molybdenum-Tungsten Alloy Rod and Bar

ABSTRACT
This specification covers nickel-chromium-molybdenum-columbium (UNS N06625), nickel-chromium-molybdenum-silicon alloy (UNS N06219), and nickel-chromium-molybdenum-tungsten alloy (UNS N06650) in the form of hot-worked rod and bar and cold-worked rod. The matreial shall conform to the required chemical composition for carbon, manganese, silicon, phosphorus, sulfur, chromium, columbium, tantalum, cobalt, molybdenum, iorn, aluminum, titanium, copper, nickel, tungsten, and nitrogen. The materials shall conform to the the heat treatment and room temperature tensile properties such as tensile strength, yield strength, and elongation. Dimensions of the alloys such as diameter, thickness, or width, length and straightness shall also be determined.
SCOPE
1.1 This specification covers nickel-chromium-molybdenum-niobium alloy (UNS N06625), nickel-chromium-molybdenum-silicon alloy (UNS N06219), and Nickel-Chromium-Molybdenum-Tungsten Alloy (UNS N06650)2 in the form of both hot-worked and cold-worked rod and bar in the conditions shown in Table 1.  
1.1.1 UNS N06625 products are furnished in three grades of different heat-treated conditions:
1.1.1.1 Grade 1 (Annealed)—Material is normally employed in service temperatures up to 1100 °F (593 °C).
1.1.1.2 Grade 2 (Solution Annealed)—Material is normally employed in service temperatures above 1100 °F (593 °C) when resistance to creep and rupture is required.  
Note 1: Hot-working or reannealing may change properties significantly, depending on working history and temperatures.
1.1.1.3 Grade 3 (Solution Annealed and Cold Worked)—Material is normally employed in services where higher strengths are needed.  
1.1.2 Alloys UNS N06219 and UNS N06650 are supplied in solution annealed condition only.  
1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.  
1.3 The following precautionary caveat pertains only to the test methods portion, Section 12, of this specification: This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to become familiar with all hazards including those identified in the appropriate Safety Data Sheet (SDS) for this product/material as provided by the manufacturer, to establish appropriate safety, health, and environmental practices, and determine the applicability of regulatory limitations prior to use.  
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

• Status: Published
• Publication Date: 31-Oct-2023
• ICS: 77.150.40 - Nickel and chromium products
• Technical Committee: B02 - Nonferrous Metals and Alloys
• Drafting Committee: B02.07 - Refined Nickel and Cobalt and Their Alloys

Relations

• Replaces: ASTM B446-19 - Standard Specification for Nickel-Chromium-Molybdenum-Columbium Alloy (UNS N06625), Nickel-Chromium-Molybdenum-Silicon Alloy (UNS N06219), and Nickel-Chromium-Molybdenum-Tungsten Alloy (UNS N06650) Rod and Bar
• Effective Date: 01-Nov-2023
• Refers: ASTM E8/E8M-24 - Standard Test Methods for Tension Testing of Metallic Materials
• Effective Date: 01-Jan-2024
• Refers: ASTM E8/E8M-22 - Standard Test Methods for Tension Testing of Metallic Materials
• Effective Date: 01-May-2022
• Referred By: ASTM B443-19 - Standard Specification for Nickel-Chromium-Molybdenum-Columbium Alloy and Nickel-Chromium-Molybdenum-Silicon Alloy Plate, Sheet, and Strip
• Effective Date: 01-Nov-2023
• Referred By: ASTM F1511-18(2023) - Standard Specification for Mechanical Seals for Shipboard Pump Applications
• Effective Date: 01-Nov-2023
• Referred By: ASTM B366/B366M-23 - Standard Specification for Factory-Made Wrought Nickel and Nickel Alloy Fittings
• Effective Date: 01-Nov-2023

Overview

ASTM B446-23 is the standard specification for rod and bar products made from nickel-chromium-molybdenum alloys with additional elements such as niobium, silicon, or tungsten. These high-performance alloys, designated as UNS N06625, UNS N06219, and UNS N06650, are supplied as hot-worked or cold-worked rod and bar. This specification covers both dimensional tolerances and chemical composition, as well as mechanical properties and permissible finishes for a wide range of industrial and engineering applications where corrosion resistance and high strength are required.

Key Topics

• Material Grades:
  • UNS N06625: Available in three grades:
    • Grade 1 (Annealed): For service up to 1100 °F (593 °C).
    • Grade 2 (Solution Annealed): For service above 1100 °F when resistance to creep and rupture is required.
    • Grade 3 (Solution Annealed and Cold Worked): Employed where higher strength is necessary.
  • UNS N06219 and UNS N06650: These alloys are provided in solution annealed condition only.
• Product Forms:
  • Hot-worked rod and bar
  • Cold-worked rod and bar
• Chemical Composition:
  • Strict limits on elements including carbon, manganese, silicon, phosphorus, sulfur, chromium, niobium (columbium), tantalum, cobalt, molybdenum, iron, aluminum, titanium, copper, nickel, tungsten, and nitrogen.
• Mechanical Properties:
  • Defined tensile strength, yield strength, and elongation requirements, depending on grade and processing.
• Dimensional Tolerances:
  • Specified tolerances for diameter, thickness, width, straightness, and length.
• Heat Treatment:
  • Precise heat treatment procedures based on grade and intended application.
• Product Marking and Certification:
  • Detailed requirements for marking, documentation, and certification for traceability and quality assurance.

Applications

Rod and bar products specified in ASTM B446-23 are widely used in industries that demand superior resistance to corrosion, oxidation, and high-temperature environments, including:

• Chemical Processing: Components for reactors, heat exchangers, and piping requiring resistance to aggressive media.
• Oil and Gas: Parts for deep-sea and sour gas extraction environments, including downhole equipment and valves.
• Power Generation: Used in turbine components and high-stress areas exposed to heat and corrosive gases.
• Aerospace: Engine parts and structural components that must retain strength and integrity at high temperatures.
• Marine Engineering: Shafts and fasteners exposed to saltwater, where both mechanical strength and corrosion resistance are critical.

These applications benefit from the alloys' excellent mechanical and thermal properties, ensuring safety, longevity, and reliable performance.

Related Standards

Several other ASTM standards are referenced within ASTM B446-23 for testing and additional requirements:

• ASTM B443: Specification for plate, sheet, and strip of nickel-chromium-molybdenum alloys.
• ASTM B880: General requirements for chemical check analysis limits for nickel, nickel alloys, and cobalt alloys.
• ASTM B899: Terminology relating to non-ferrous metals and alloys.
• ASTM E8/E8M: Test methods for tension testing of metallic materials.
• ASTM E29: Practice for using significant digits in test data.
• ASTM E1473: Test methods for chemical analysis of nickel, cobalt, and high-temperature alloys.

These related standards provide additional guidance on analysis, terminology, and mechanical testing, ensuring comprehensive control of product quality and consistency.

---

Keywords: ASTM B446, nickel-chromium-molybdenum alloy, UNS N06625, UNS N06219, UNS N06650, rod and bar specification, corrosion-resistant alloys, high-temperature alloys, industrial standards, ASTM standards

Standards Content (Sample)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: B446 − 23
Standard Specification for
Nickel-Chromium-Molybdenum-Niobium Alloy, Nickel-
Chromium-Molybdenum-Silicon Alloy, and Nickel-Chromium-
Molybdenum-Tungsten Alloy Rod and Bar
This standard is issued under the fixed designation B446; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope* those identified in the appropriate Safety Data Sheet (SDS) for
this product/material as provided by the manufacturer, to
1.1 This specification covers nickel-chromium-
establish appropriate safety, health, and environmental
molybdenum-niobium alloy (UNS N06625), nickel-chromium-
practices, and determine the applicability of regulatory limi-
molybdenum-silicon alloy (UNS N06219), and Nickel-
2 tations prior to use.
Chromium-Molybdenum-Tungsten Alloy (UNS N06650) in
1.4 This international standard was developed in accor-
the form of both hot-worked and cold-worked rod and bar in
dance with internationally recognized principles on standard-
the conditions shown in Table 1.
ization established in the Decision on Principles for the
1.1.1 UNS N06625 products are furnished in three grades of
Development of International Standards, Guides and Recom-
different heat-treated conditions:
mendations issued by the World Trade Organization Technical
1.1.1.1 Grade 1 (Annealed)—Material is normally em-
Barriers to Trade (TBT) Committee.
ployed in service temperatures up to 1100 °F (593 °C).
1.1.1.2 Grade 2 (Solution Annealed)—Material is normally
2. Referenced Documents
employed in service temperatures above 1100 °F (593 °C)
when resistance to creep and rupture is required. 2.1 ASTM Standards:
B443 Specification for Nickel-Chromium-Molybdenum-
NOTE 1—Hot-working or reannealing may change properties
Columbium Alloy and Nickel-Chromium-Molybdenum-
significantly, depending on working history and temperatures.
Silicon Alloy Plate, Sheet, and Strip
1.1.1.3 Grade 3 (Solution Annealed and Cold Worked)—
B880 Specification for General Requirements for Chemical
Material is normally employed in services where higher
Check Analysis Limits for Nickel, Nickel Alloys and
strengths are needed.
Cobalt Alloys
1.1.2 Alloys UNS N06219 and UNS N06650 are supplied in
B899 Terminology Relating to Non-ferrous Metals and Al-
solution annealed condition only.
loys
1.2 The values stated in inch-pound units are to be regarded
E8/E8M Test Methods for Tension Testing of Metallic Ma-
as standard. The values given in parentheses are mathematical
terials
conversions to SI units that are provided for information only
E29 Practice for Using Significant Digits in Test Data to
and are not considered standard.
Determine Conformance with Specifications
E1473 Test Methods for Chemical Analysis of Nickel,
1.3 The following precautionary caveat pertains only to the
Cobalt, and High-Temperature Alloys
test methods portion, Section 12, of this specification: This
standard does not purport to address all of the safety concerns,
3. Terminology
if any, associated with its use. It is the responsibility of the user
of this standard to become familiar with all hazards including
3.1 Definitions:
3.1.1 For definitions of terms used in this specification,
refer to Terminology B899.
3.2 Definitions of Terms Specific to This Standard:
This specification is under the jurisdiction of ASTM Committee B02 on
Nonferrous Metals and Alloys and is the direct responsibility of Subcommittee
B02.07 on Refined Nickel and Cobalt and Their Alloys.
Current edition approved Nov. 1, 2023. Published November 2023. Originally
approved in 1966. Last previous edition approved in 2019 as B446 – 19. DOI: For referenced ASTM standards, visit the ASTM website, www.astm.org, or
10.1520/B0446-23. contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
Designation (UNS N06650) was established in accordance with Practice E527 Standards volume information, refer to the standard’s Document Summary page on
and SAE J 1086, Practice for Numbering Metals and Alloys (UNS). the ASTM website.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
B446 − 23
TABLE 1 Conditions for Hot-Worked and Cold-Worked Rod and TABLE 3 Permissible Variations in Dimension of Cold-Worked
A
Bar Rod and Bar
Tensile Yield Elongation
Permissible Variations from Specified
Diameter or Distance
A
Strength Strength in 2 in. or Specified Dimension ,
Dimension, in. (mm)
Between Parallel Surfaces,
in. (mm)
min, ksi (0.2 % offset), 50 mm or
in. (mm) Plus Minus
(MPa) min, ksi (MPa) 4D, min, %
B 1 3
⁄16 (1.6) to ⁄16 (4.8), excl 0 0.002 (0.05)
UNS N06625 Grade 1 (Annealed)
3 1
⁄16 (4.8) to ⁄2 (12.7), excl 0 0.003 (0.08)
Up to 4 (102), incl 120 (827) 60 (414) 30
1 15
⁄2 (12.7) to ⁄16 (23.8), incl 0.001 (0.03) 0.002 (0.05)
Over 4 (102) to 10 (254), 110 (758) 50 (345) 25
15 15
incl Over ⁄16 (23.8) to 1 ⁄16 (49.2), incl 0.0015 (0.04) 0.003 (0.08)
C 15 1
Over 1 ⁄16 (49.2) to 2 ⁄2 (63.5), incl 0.002 (0.05) 0.004 (0.10)
UNS N06625 Grade 2 (Solution Annealed)
All sizes 100 (690) 40 (276) 30 A
Dimensions apply to diameter of rods, to distance between parallel surfaces of
UNS N06625 Grade 3 (Solution Annealed and Cold-Worked)
squares and hexagonals, and separately to width and thickness of rectangles.
Up to 2.5 in. (63 mm) 135 (930) 100 (690) 25
UNS N06219 All (Solution Annealed)
All sizes 96 (660) 39 (270) 50
UNS N06650 All (Solution Annealed)
TABLE 4 Permissible Variations in Dimension or Distance
All sizes 116 (800) 58 (400) 45
Between Parallel Surfaces of Hot-Worked Rod and Bar
A
Forging quality is furnished to chemical requirements and surface inspection
Permissible Variations from
only. No tensile properties are required. Forging stock is typically supplied in the
Specified Dimensions, in.
Specified Dimension,
hot worked condition, (see X1.1.5). A
(mm)
in. (mm)
B
Annealed 1600 °F (871 °C) minimum.
Plus Minus
C
Solution annealed at 2000 °F (1093 °C) minimum, with or without subsequent
stabilization anneal at 1800 °F (982 °C) minimum to increase resistance to Rod and bar, hot-worked:
sensitization. 1 (25.4) and under 0.016 (0.41) 0.016 (0.41)
Over 1 (25.4) to 2 (50.8), incl 0.031 (0.79) 0.016 (0.41)
Over 2 (50.8) to 4 0.047 (1.19) 0.031 (0.79)
(101.6), incl
Over 4 (101.6) 0.125 (3.18) 0.063 (1.60)
3.2.1 bar, n—material of rectangular (flats) or square solid
Rod and bar, rough-turned or
section up to and including 10 in. (254 mm) in width and ⁄8 in.
ground:
(3.2 mm) and over in thickness in straight lengths. Under 1 (25.4) 0.005 (0.13) 0.005 (0.13)
1 (25.4) and over 0.031 (0.79) 0
3.2.1.1 Discussion—Hot-worked rectangular bar in widths
B
Forging quality rod:
10 in. (254 mm) and under may be furnished as hot-rolled plate
Under 1 (25.4) 0.005 (0.13) 0.005 (0.13)
1 (25.4) and over 0.031 (0.79) 0
with sheared or cut edges in accordance with Specification
A
B443, provided the mechanical property requirements of this
Dimensions apply to diameter of rods, to distance between parallel surfaces of
squares and hexagonals, and separately to width and thickness of rectangles.
specification are met.
B
Spot grinding is permitted to remove minor surface imperfections. The depth of
3.2.2 rod, n—material of round solid section furnished in these spot ground areas shall not exceed 3 % of the diameter of the rod.
straight lengths.
4. Ordering Information
performance of material ordered under this specification.
4.1 It shall be the responsibility of the purchaser to specify
Examples of such requirements include, but are not limited to,
all requirements that are necessary for the safe and satisfactory
the following:
4.1.1 ASTM specification designation and year date to
A,B
TABLE 2 Chemical Requirements
which the product is to be furnished and be certified as
Composition
meeting,
Limits, %
Element
4.1.2 UNS number,
N06625 N06219 N06650
4.1.3 Section—Rod (round) or bar (square, rectangular, or
Carbon 0.10 0.05 0.03
hexagonal),
Manganese 0.50 0.50 0.50
Silicon 0.50 0.70–1.10 0.50
4.1.4 Dimensions, including length,
Phosphorus 0.015 0.020 0.020
4.1.5 Condition (see 1.1.1, 1.1.2, and Appendix),
Sulfur 0.015 0.010 0.010
Chromium 20.0–23.0 18.0–22.0 19.0–21.0 4.1.6 Grade designation,
C
Niobium + tantalum 3.15–4.15 . 0.05–0.50
4.1.6.1 If no grade of N06625 is specified, Grade 1 will be
Cobalt (if determined) 1.0 1.0 1.0
supplied.
Molybdenum 8.0–10.0 7.0–9.0 9.5–12.5
Iron 5.0 2.0–4.0 12.0–16.0 4.1.7 Shape and finish characteristics (Section 8),
Aluminum 0.40 0.50 0.05–0.50
4.1.8 Quantity—Feet (or metres) or number of pieces,
Titanium 0.40 0.50 .
4.1.9 Samples for Product (Check) Analysis—State whether
Copper . 0.50 0.30
D
Nickel 58.0 min Bal. Bal.
samples for product (check) analysis should be furnished (see
Tungsten . . 0.50–2.50
5.2),
Nitrogen . . 0.05–0.20
4.1.10 Product Marking (see Section 16)—State product
A
All values are maximums unless specified as a minimum or a range is provided.
marking requirements, and
B
Where ellipses (.) appear in this table there is no requirement and the element
need neither be analyzed for or reported. 4.1.11 Purchaser Inspection (see Section 13)—If purchaser
C
Columbium and Niobium are interchangeable names for the same element and
wishes to witness tests or inspection of material at place of
both names are acceptable for use in B02.07 specifications.
D manufacture, the purchase order must so state, indicating
Nickel shall be determined arithmetically by difference.
which test or inspections are to be witnessed.
B446 − 23
5. Chemical Composition 7.5.1 The permissible variations in straightness of cold-
worked rod and bar as determined by the departure from
5.1 The material shall conform to the composition limits
straightness shall be as prescribed in Table 7.
specified in Table 2.
7.5.2 The permissible variations in straightness of hot-
5.2 If a product (check) analysis is performed by the
worked rod and bar as determined by the departure from
purchaser, the material shall conform to the product (check)
straightness shall be as specified in Table 8.
analysis variations in Specification B880.
8. Workmanship, Finish, and Appearance
6. Mechanical Properties and Other Requirements
8.1 The material shall be uniform in quality and condition,
6.1 Mechanical Properties—The material shall conform to
smooth, commercially straight or flat, and free of injurious
the heat treatment and room temperature tensile properties
imperfections.
prescribed in Table 1.
9. Sampling
7. Dimensions and Permissible Variations
9.1 Lot—Definition:
7.1 Diameter, Thickness, or Width—The permissible varia-
9.1.1 A lot for chemical analysis shall consist of one heat.
tions from the specified dimensions of cold-worked rod and bar
9.1.2 A lot for mechanical properties testing shall consist of
shall be as prescribed in Table 3, and of hot-worked rod and bar
all material from the same heat, nominal diameter or thickness,
as prescribed in Table 4.
and condition.
7.2 Out-of-Round—Hot-worked rods and cold-worked rods
9.1.2.1 Where material cannot be identified by heat, a lot
(except “forging quality”) all sizes, in straight lengths, shall not
shall consist of not more than 500 lb (227 kg) of material in the
be out-of-round by more than one half the total permissible
same size and condition except that a single piece weighing
variations in diameter shown in Tables 3 and 4, except for
over 500 lb (227 kg) shall be considered as one lot.
hot-worked rods ⁄2 in. (12.7 mm) in diameter and under, which
9.2 Test Material Selection:
may be out-of-round by the total permissible variations in
diameter shown in Table 4. 9.2.1 Chemical Analysis—Representative samples from
each lot shall be taken during pouring or subsequent process-
7.3 Machining Allowances for Hot-Worked Materials—
ing.
When the surfaces of hot-worked products are to be machined,
9.2.1.1 Product (check) analysis shall be wholly
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: B446 − 19 B446 − 23
Standard Specification for
Nickel-Chromium-Molybdenum-Columbium Alloy (UNS
N06625), Nickel-Chromium-Molybdenum-Silicon Alloy (UNS
N06219), Nickel-Chromium-Molybdenum-Niobium Alloy,
Nickel-Chromium-Molybdenum-Silicon Alloy, and Nickel-
Chromium-Molybdenum-Tungsten Alloy (UNS N06650) Rod
and Bar
This standard is issued under the fixed designation B446; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope*
1.1 This specification covers nickel-chromium-molybdenum-columbium nickel-chromium-molybdenum-niobium alloy (UNS
N06625), nickel-chromium-molybdenum-silicon alloy (UNS N06219), and Nickel-Chromium-Molybdenum-Tungsten Alloy
(UNS N06650) in the form of both hot-worked and cold-worked rod and bar and cold-worked rod in the conditions shown in Table
1.
1.1.1 UNS N06625 products are furnished in twothree grades of different heat-treated conditions:
1.1.1.1 Grade 1 (Annealed)—Material is normally employed in service temperatures up to 1100°F (593°C).1100 °F (593 °C).
1.1.1.2 Grade 2 (Solution Annealed)—Material is normally employed in service temperatures above 1100°F (593°C)1100 °F
(593 °C) when resistance to creep and rupture is required.
NOTE 1—Hot-working or reannealing may change properties significantly, depending on working history and temperatures.
1.1.1.3 Grade 3 (Solution Annealed and Cold Worked)—Material is normally employed in services where higher strengths are
needed.
1.1.2 Alloys UNS N06219 and UNS N06650 are supplied in solution annealed condition only.
1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only and are not considered standard.
1.3 The following precautionary caveat pertains only to the test methods portion, Section 12, of this specification: cThisThis
standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user
This specification is under the jurisdiction of ASTM Committee B02 on Nonferrous Metals and Alloys and is the direct responsibility of Subcommittee B02.07 on Refined
Nickel and Cobalt and Their Alloys.
Current edition approved April 1, 2019Nov. 1, 2023. Published April 2019November 2023. Originally approved in 1966. Last previous edition approved in 20142019 as
B446B446 – 19.– 03 (2014). DOI: 10.1520/B0446-19. DOI: 10.1520/B0446-23.
Designation (UNS N06650) was established in accordance with Practice E527 and SAE J 1086, Practice for Numbering Metals and Alloys (UNS).
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
B446 − 23
TABLE 1 Conditions for Hot-Worked and Cold-Worked Rod and
A
Bar and Cold-Worked Rod
Tensile Yield Elongation
Diameter or Distance
Strength Strength in 2 in. or
Between Parallel Surfaces,
min, ksi (0.2 % offset), 50 mm or
in. (mm)
(MPa) min, ksi (MPa) 4D, min, %
B
UNS N06625 Grade 1 (Annealed)
Up to 4 (102), incl 120 (827) 60 (414) 30
Over 4 (102) to 10 (254), 110 (758) 50 (345) 25
incl
C
UNS N06625 Grade 2 (Solution Annealed)
All sizes 100 (690) 40 (276) 30
UNS N06625 Grade 3 (Solution Annealed and Cold-Worked)
Up to 2.5 in. (63 mm) 135 (930) 100 (690) 25
UNS N06219 All (Solution Annealed)
All sizes 96 (660) 39 (270) 50
UNS N06650 All (Solution Annealed)
All sizes 116 (800) 58 (400) 45
A
Forging quality is furnished to chemical requirements and surface inspection
only. No tensile properties are required. Forging stock is typically supplied in the
hot worked condition, (see X1.1.5).
B
Annealed 1600°F (871°C)1600 °F (871 °C) minimum.
C
Solution annealed at 2000°F (1093°C)2000 °F (1093 °C) minimum, with or
without subsequent stabilization anneal at 1800°F (982°C)1800 °F (982 °C) mini-
mum to increase resistance to sensitization.
of this standard to become familiar with all hazards including those identified in the appropriate Safety Data Sheet (SDS) for this
product/material as provided by the manufacturer, to establish appropriate safety, health, and environmental practices, and
determine the applicability of regulatory limitations prior to use.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2.1 ASTM Standards:
B443 Specification for Nickel-Chromium-Molybdenum-Columbium Alloy and Nickel-Chromium-Molybdenum-Silicon Alloy
Plate, Sheet, and Strip
B880 Specification for General Requirements for Chemical Check Analysis Limits for Nickel, Nickel Alloys and Cobalt Alloys
B899 Terminology Relating to Non-ferrous Metals and Alloys
E8/E8M Test Methods for Tension Testing of Metallic Materials
E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
E1473 Test Methods for Chemical Analysis of Nickel, Cobalt, and High-Temperature Alloys
3. Terminology
3.1 Definitions:
3.1.1 For definitions of terms used in this specification, refer to Terminology B899.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 bar, n—material of rectangular (flats) or square solid section up to and including 10 in. (254 mm) in width and ⁄8 in. (3.2
mm) and over in thickness in straight lengths.
3.2.1.1 Discussion—
Hot-worked rectangular bar in widths 10 in. (254 mm) and under may be furnished as hot-rolled plate with sheared or cut edges
in accordance with Specification B443, provided the mechanical property requirements of this specification are met.
3.2.2 rod, n—material of round solid section furnished in straight lengths.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
B446 − 23
TABLE 2 Chemical Requirements
Composition
Limits, %
Element
N06625 N06219 N06650
Carbon 0.10 max 0.05 max 0.03 max
Manganese 0.50 max 0.50 max 0.50 max
Silicon 0.50 max 0.70-1.10 0.50 max
Phosphorus 0.015 max 0.020 max 0.020 max
Sulfur 0.015 max 0.010 max 0.010 max
Chromium 20.0 min 18.0-22.0 19.0-21.0
23.0 max . .
Columbium + tantalum 3.15 min . 0.05-0.50
4.15 max .
Cobalt (if determined) 1.0 max 1.0 max 1.0 max
Molybdenum 8.0 min 7.0-9.0 9.5-12.5
10.0 max . .
Iron 5.0 max 2.0-4.0 12.0-16.0
Aluminum 0.40 max 0.50 max 0.05-0.50
Titanium 0.40 max 0.50 max .
Copper . 0.50 max 0.30 max
A
Nickel 58.0 min Bal. Bal.
Tungsten . . 0.50-2.50
Nitrogen . . 0.05-0.20
A,B
TABLE 2 Chemical Requirements
Composition
Limits, %
Element
N06625 N06219 N06650
Carbon 0.10 0.05 0.03
Manganese 0.50 0.50 0.50
Silicon 0.50 0.70–1.10 0.50
Phosphorus 0.015 0.020 0.020
Sulfur 0.015 0.010 0.010
Chromium 20.0–23.0 18.0–22.0 19.0–21.0
C
Niobium + tantalum 3.15–4.15 . 0.05–0.50
Cobalt (if determined) 1.0 1.0 1.0
Molybdenum 8.0–10.0 7.0–9.0 9.5–12.5
Iron 5.0 2.0–4.0 12.0–16.0
Aluminum 0.40 0.50 0.05–0.50
Titanium 0.40 0.50 .
Copper . 0.50 0.30
D
Nickel 58.0 min Bal. Bal.
Tungsten . . 0.50–2.50
Nitrogen . . 0.05–0.20
A
All values are maximums unless specified as a minimum or a range is provided.
B
Where ellipses (.) appear in this table there is no requirement and the element
need neither be analyzed for or reported.
C
Columbium and Niobium are interchangeable names for the same element and
both names are acceptable for use in B02.07 specifications.
D
Element Nickel shall be determined arithmetically by difference.
TABLE 3 Permissible Variations in DiameterDimension of Cold-
Worked Rod and Bar
Permissible Variations from Specified
A
Specified Dimension,Dimension ,
Dimension, in. (mm)
in. (mm)
Plus Minus
1 3
⁄16 (1.6) to ⁄16 (4.8), excl 0 0.002 (0.05)
3 1
⁄16 (4.8) to ⁄2 (12.7), excl 0 0.003 (0.08)
1 15
⁄2 (12.7) to ⁄16 (23.8), incl 0.001 (0.03) 0.002 (0.05)
15 15
Over ⁄16 (23.8) to 1 ⁄16 (49.2), incl 0.0015 (0.04) 0.003 (0.08)
15 1
Over 1 ⁄16 (49.2) to 2 ⁄2 (63.5), incl 0.002 (0.05) 0.004 (0.10)
A
Dimensions apply to diameter of rods, to distance between parallel surfaces of
squares and hexagonals, and separately to width and thickness of rectangles.
4. Ordering Information
4.1 It is shall be the responsibility of the purchaser to specify all requirements that are necessary for the safe and satisfactory
performance of material ordered under this specification. Examples of such requirements include, but are not limited to, the
following:
B446 − 23
TABLE 4 Permissible Variations in DiameterDimension or
Distance Between Parallel Surfaces of Hot-Worked Rod and Bar
Permissible Variations from
Specified Dimensions, in.
Specified Dimension,
A
(mm)
in. (mm)
Plus Minus
Rod and bar, hot-worked:
1 (25.4) and under 0.016 (0.41) 0.016 (0.41)
Over 1 (25.4) to 2 (50.8), incl 0.031 (0.79) 0.016 (0.41)
Over 2 (50.8) to 4 0.047 (1.19) 0.031 (0.79)
(101.6), incl
Over 4 (101.6) 0.125 (3.18) 0.063 (1.60)
Rod, rough-turned or
ground:
Rod and bar, rough-turned or
ground:
Under 1 (25.4) 0.005 (0.13) 0.005 (0.13)
1 (25.4) and over 0.031 (0.79) 0
B
Forging quantity rod:
B
Forging quality rod:
Under 1 (25.4) 0.005 (0.13) 0.005 (0.13)
1 (25.4) and over 0.031 (0.79) 0
A
Dimensions apply to diameter of rods, to distance between parallel surfaces of
squares, and squares and hexagonals, and separately to width and thickness of
rectangles.
B
Spot grinding is permitted to remove minor surface imperfections. The depth of
these spot ground areas shall not exceed 3 % of the diameter of the rod.
4.1.1 ASTM designation,specification designation and year date to which the product is to be furnished and be certified as
meeting,
4.1.2 UNS number,
4.1.3 Section—Rod (round) or bar (square or rectangular),(square, rectangular, or hexagonal),
4.1.4 Dimensions, including length,
4.1.5 Condition (see 1.1.1, 1.1.2, and appendix),Appendix),
4.1.5.1 If neither grade of N06625 is specified, Grade 1 will be supplied,
4.1.6 Grade designation,
4.1.6.1 If no grade of N06625 is specified, Grade 1 will be supplied.
4.1.7 Finish Shape and finish characteristics (Section 8),
4.1.8 Quantity—Feet (or metres) or number of pieces,
4.1.9 Samples for Product (Check) Analysis—State whether samples for product (check) analysis should be furnished (see 5.2),
and
4.1.10 Product Marking (see Section 16)—State product marking requirements.requirements, and
4.1.11 Purchaser Inspection (see Section 13)—If purchaser wishes to witness tests or inspection of material at place of
manufacture, the purchase order must so state, indicating which test or inspections are to be witnessed.
5. Chemical Composition
5.1 The material shall conform to the composition limits specified in Table 2.
B446 − 23
5.2 If a product (check) analysis is performed by the purchaser, the material shall conform to the product (check) analysis
variations in Specification B880.
6. Mechanical Properties and Other Requirements
6.1 Mechanical Properties—The material shall conform to the heat treatment and room temperature tensile properties prescribed
in Table 1.
7. Dimensions and Permissible Variations
7.1 Diameter, Thickness, or Width—The permissible variations from the specified dimensions of cold-worked rod and bar shall be
as prescribed in Table 3, and of hot-worked rod and bar as prescribed in Table 4.
7.2 Out-of-Round—Hot-worked rods and cold-worked rods (except “forging quality”) all sizes, in straight lengths, shall not be
out-of-round by more than one half the total permissible variations in diameter shown in Tables 3 and 4, except for hot-worked
rods ⁄2 in. (12.7 mm) in diameter and under, which may be out-of-round by the total permissible variations in diameter shown in
Table 4.
7.3 Machining Allowances for Hot-Worked Materials—When the surfaces of hot-worked products are to be machined, the
allowances prescribed in Table 5 are recommended for normal machining operations.
7.4 Length—The permissible variations in length of cold-worked and hot-worked rod and bar shall be as prescribed in Table 6.
7.4.1 Rods and bars ordered to random or nominal lengths will be furnished with either cropped or saw-cut ends; material ordered
to cut lengths will be furnished with square saw-cut or machined ends.
7.5 Straightness:
7.5.1 The permissible variations in straightness of cold-worked rod and bar as determined by the departure from straightness shall
be as prescribed in Table 7.
7.5.2 The permissible variations in straightness of hot-worked rod and bar as determined by the departure from straightness shall
be as specified in Table 8.
8. Workmanship, Finish, and Appearance
8.1 The material shall be uniform in quality and condition, smooth, commercially
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