ASTM B573-24

Standard Specification for Nickel-Molybdenum-Chromium-Iron Alloys Bar or Rod

ABSTRACT
This specification covers rods of nickel-molybdenum-chromium-iron alloys with UNS Nos. N10003 and N10242 for use in general corrosive service. Specimens shall be sampled and prepared, then tested accordingly to examine their conformance to dimensional (diameter, length, out-of-roundness, weight, and straightness), mechanical (tensile and yield strengths, and elongation), and chemical composition requirements.
SCOPE
1.1 This specification2 covers nickel-molybdenum-chromium-iron alloys in the form of bar or rod. The alloys are typically for general corrosive service but not limited to this usage.  
1.2 Alloys that can currently be certified to this specification are UNS N10003 and UNS N10242.  
1.3 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.  
1.4 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.  
1.5 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-Mar-2024
• 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 B573-06(2016) - Standard Specification for Nickel-Molybdenum-Chromium-Iron Alloys (UNS N10003, N10242) Rod
• Effective Date: 01-Apr-2024
• Referred By: ASTM B366/B366M-23 - Standard Specification for Factory-Made Wrought Nickel and Nickel Alloy Fittings
• Effective Date: 01-Apr-2024

Overview

ASTM B573-24 is the international standard specification for nickel-molybdenum-chromium-iron alloys in the form of bar or rod, specifically covering UNS N10003 and UNS N10242 grades. Developed by ASTM International, this standard outlines requirements for the production, testing, and certification of these high-performance alloys primarily for general corrosive service, though their use is not limited to this application.

This specification ensures consistent quality and performance through stringent guidelines for chemical composition, mechanical properties, dimensions, and permissible variations. It is regularly updated to align with global standardization principles and the latest industry best practices.

Key Topics

• Material Grades Covered:
  • UNS N10003 and UNS N10242 nickel-molybdenum-chromium-iron alloys
• Product Forms:
  • Bar or rod, in various hot-finished or cold-finished conditions
• Dimensional Requirements:
  • Diameter, length, out-of-roundness, and straightness with permissible variations for each finish category
• Mechanical Properties:
  • Minimum specified levels for tensile strength, yield strength, and elongation
• Chemical Composition:
  • Defined limits on elements such as nickel, molybdenum, chromium, iron, carbon, silicon, cobalt, manganese, tungsten, vanadium, phosphorus, sulfur, aluminum, copper, and boron
• Sampling, Testing & Inspection:
  • Procedures for lot sampling, mechanical testing, chemical analysis, retests, and certification
• Marking & Certification:
  • Specific labeling and documentation requirements for traceability and compliance

Applications

Nickel-molybdenum-chromium-iron alloy bars and rods produced under ASTM B573-24 are valued for their exceptional corrosion resistance and mechanical strength. Typical applications include:

• Chemical processing equipment:
  • Vessels, piping, fittings, and valves exposed to aggressive chemicals
• Oil and gas industry:
  • Downhole equipment, pumps, heat exchangers, and other critical corrosion-resistant components
• Power generation:
  • Equipment in nuclear, thermal, and renewable energy sectors where resistance to corrosive media is crucial
• Pharmaceutical manufacturing:
  • Process equipment requiring high purity and resistance to harsh cleaning agents
• Aerospace and marine applications:
  • Components subject to corrosive environments and mechanical stresses

The alloys specified are chosen for their superior performance in harsh environments, ensuring durability and reliability in demanding industrial processes.

Related Standards

ASTM B573-24 works in conjunction with a range of supporting and related ASTM standards that help to define testing methods, chemical analysis, and terminology, such as:

• ASTM B880: Specification for General Requirements for Chemical Check Analysis Limits for Nickel, Nickel Alloys, and Cobalt Alloys
• ASTM B899: Terminology Relating to Nonferrous Metals and Alloys
• ASTM E8/E8M: Test Methods for Tension Testing of Metallic Materials
• ASTM E29: Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
• ASTM E1473: Test Methods for Chemical Analysis of Nickel, Cobalt, and High-Temperature Alloys

Other international or industry standards may also be applicable, particularly for pressure vessel or specialized equipment requirements.

---

By aligning production and sourcing activities with ASTM B573-24, manufacturers, suppliers, and end-users can ensure consistent quality and performance for nickel-molybdenum-chromium-iron alloy bars and rods used in critical, corrosion-resistant applications. Following this standard supports compliance, safety, and operational efficiency in industries where material reliability is paramount.

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: B573 − 24
Standard Specification for
Nickel-Molybdenum-Chromium-Iron Alloys Bar or Rod
This standard is issued under the fixed designation B573; 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.
1. Scope* B899 Terminology Relating to Non-ferrous Metals and Al-
loys
1.1 This specification covers nickel-molybdenum-
E8/E8M Test Methods for Tension Testing of Metallic Ma-
chromium-iron alloys in the form of bar or rod. The alloys are
terials
typically for general corrosive service but not limited to this
E29 Practice for Using Significant Digits in Test Data to
usage.
Determine Conformance with Specifications
1.2 Alloys that can currently be certified to this specification
E1473 Test Methods for Chemical Analysis of Nickel,
are UNS N10003 and UNS N10242.
Cobalt, and High-Temperature Alloys
1.3 The values stated in inch-pound units are to be regarded
3. Terminology
as standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only 3.1 Common B02.07 terminology is found in Specification
B899.
and are not considered standard.
1.4 This standard does not purport to address all of the
3.2 Definitions of Terms Specific to This Standard:
safety concerns, if any, associated with its use. It is the 3.2.1 bar, n—an elongated, forged or rolled metal product
responsibility of the user of this standard to become familiar
with uniform strength, length and diameter.
with all hazards including those identified in the appropriate
3.2.2 rod, n—a hot-finished product of round solid section
Safety Data Sheet (SDS) for this product/material as provided
furnished in straight lengths.
by the manufacturer, to establish appropriate safety, health,
and environmental practices, and determine the applicability 4. Ordering Information
of regulatory limitations prior to use.
4.1 It is the responsibility of the purchaser to specify all
1.5 This international standard was developed in accor-
requirements that are necessary for the safe and satisfactory
dance with internationally recognized principles on standard-
performance of material ordered under this specification.
ization established in the Decision on Principles for the
4.2 Examples of such requirements include but are not
Development of International Standards, Guides and Recom-
limited to the following:
mendations issued by the World Trade Organization Technical
4.2.1 Dimensions—See Section 8.
Barriers to Trade (TBT) Committee.
4.2.2 Purchaser Inspection—See Section 13.
4.2.3 Samples for Product (Check) Analysis—See Section
2. Referenced Documents
10.
2.1 ASTM Standards:
B880 Specification for General Requirements for Chemical 5. Materials and Manufacture
Check Analysis Limits for Nickel, Nickel Alloys and
5.1 The finish options for products certified to this specifi-
Cobalt Alloys
cation are:
5.1.1 Hot-Finished, Annealed, and Descaled Rod,
5.1.2 Hot-Finished, Annealed, and Ground Bar,
This specification is under the jurisdiction of ASTM Committee B02 on
5.1.3 Hot-Finished, Annealed, and Turned Bar,
Nonferrous Metals and Alloys and is the direct responsibility of Subcommittee
5.1.4 Cold-Finished and Annealed Bar, and
B02.07 on Refined Nickel and Cobalt and Their Alloys.
5.1.5 Cold-Finished, Annealed, and Ground Bar.
Current edition approved April 1, 2024. Published April 2024. Originally
approved in 1972. Last previous edition approved in 2016 as B573 – 06 (2016).
5.2 The diameters permitted for certification for each finish
DOI: 10.1520/B0573-24.
appear in the left column of Table 3.
For ASME Boiler and Pressure Vessel Code applications see Specification
SB-573 in Section II of that Code.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or 6. Chemical Composition
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
6.1 The material shall conform to the chemical composition
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. prescribed in Table 1.
*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
B573 − 24
A
TABLE 1 Chemical Requirements
8.5.2 Rods or bars ordered to cut lengths shall be furnished
Composition, %
with square saw cut or machined ends.
Element
UNS N10003 UNS N10242
8.6 Weight—For calculation of mass or weight, the follow-
Chromium 6.0–8.0 7.0–9.0
ing densities shall be used:
Iron 5.0 2.0
Carbon 0.04–0.08 0.03 3 3
Alloy lb/in g/cm
Silicon 1.00 0.80
N10003 0.317 8.78
Cobalt 0.20 1.00
N10242 0.327 9.05
Manganese 1.00 0.80
Tungsten 0.50 .
8.7 Straightness—The maximum curvature (depth of chord)
Vanadium 0.50 .
shall not exceed the number calculated by the equation below.
Molybdenum 15.0–18.0 24.0–26.0
Phosphorus 0.015 0.030 The calculated number is the maximum allowed curvature in
Sulfur 0.020 0.015
inches (inch-pound units) or millimeters (SI units).
B
Aluminum 0.50 .
Copper 0.35 0.50
Curvature [customary unit] = 0.05 × length (in feet)
Boron 0.010 0.006
Nickel remainder remainder
Curvature [SI unit] = 0.04 × length (in cm)
Aluminum . 0.50
A
Values in the table are maximums unless a range or minimum is indicated.
B
Includes titanium. 9. Workmanship, Finish, and Appearance
9.1 The material shall be uniform in quality and condition.
9.2 The finish should be smooth and free of injurious
6.2 If a product (check) analysis is made by the purchaser,
defects.
it shall be done in conformance with Specification B880.
10. Sampling
7. Mechanical Properties and Other Requirements
7.1 The mechanical properties of the material at room 10.1 Lots for Chemical Analysis and Mechanical Testing:
temperature shall conform to those shown in Table 2.
10.1.1 A lot for chemical analysis shall consist of one heat.
10.1.2 A lot for mechanical testing shall be defined as the
8. Dimensions and Permissible Variations
material from one heat in the same condition and specified
8.1 Diameter—The permissible variations from the speci-
diameter.
fied diameter shall be as prescribed in Table 3.
10.2 Sampling for Chemical Analysis:
8.2 Out-of-Roundness—The permissible variation in round-
10.2.1 A representative sample shall be obtained from each
ness shall be as prescribed in Table 3.
heat during pouring or subsequent processing.
8.3 Machining Allowances—When the surfaces of finished
10.2.2 Product (check) analysis shall be wholly the respon-
material are to be machined, the following allowances are
sibility of the purchaser. If the furnished sample is to be in
suggested for normal machining operations:
addition to the overall bulk product that was ordered, then this
8.3.1 As-finished (Annealed and Descaled)—For diameters
shall be stipulated in the contract or purchase order.
5 11
of ⁄16 in. to ⁄16 in. (7.94 mm to 17.46 mm) incl, an allowance
10.3 Sampling for Mechanical Testing—A representative
of ⁄16 in. (1.59 mm) should be added on the diameter for finish
sample shall be taken from each lot of finished material.
machining.
8.4 Length:
11. Number of Tests and Retests
8.4.1 Unless multiple, nominal, or cut lengths are specified,
random mill lengths shall be furnished. 11.1 Chemical Analysis—One test per heat.
8.4.2 The permissible variations in length of multiple,
11.2 Tension Tests—One test per lot.
nominal, or cut l
...

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: B573 − 06 (Reapproved 2016) B573 − 24
Standard Specification for
Nickel-Molybdenum-Chromium-Iron Alloys (UNS N10003,
N10242) Bar or Rod
This standard is issued under the fixed designation B573; 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.
1. Scope Scope*
1.1 This specification covers nickel-molybdenum-chromium-iron alloys (UNS N10003 and UNS N10242)in the form of bar rod
for use in general corrosive service.or rod. The alloys are typically for general corrosive service but not limited to this usage.
1.2 The following products are covered under this specification:Alloys that can currently be certified to this specification are UNS
N10003 and UNS N10242.
5 3
1.2.1 Rods ⁄16 to ⁄4 in. (7.94 to 19.05 mm) excl in diameter, hot or cold finished, annealed, and pickled or mechanically descaled.
3 1
1.2.2 Rods ⁄4 to 3 ⁄2 in. (19.05 to 88.9 mm) incl in diameter, hot or cold finished, annealed, ground, or turned.
1.3 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.
1.4 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 and healthsafety, health, and
environmental practices, and determine the applicability of regulatory limitations prior to use.
1.5 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:
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
E8E8/E8M Test Methods for Tension Testing of Metallic Materials [Metric] E0008_E0008M
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
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 June 1, 2016April 1, 2024. Published June 2016April 2024. Originally approved in 1972. Last previous edition approved in 20112016 as
B573 – 06 (2011).(2016). DOI: 10.1520/B0573-06R16.10.1520/B0573-24.
For ASME Boiler and Pressure Vessel Code applications see Specification SB-573 in Section II of that Code.
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.
*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
B573 − 24
3. Terminology
3.1 Common B02.07 terminology is found in Specification B899.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 bar, n—an elongated, forged or rolled metal product with uniform strength, length and diameter.
3.2.2 rod, n—a hot-finished product of round solid section furnished in straight lengths.
4. Ordering Information
4.1 It is 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:
4.1.1 Dimensions—Nominal diameter and length. The shortest usable multiple length shall be specified (Table 1).
4.1.2 Certification—State if certification or a report of test results is required (Section 15).
4.1.3 Purchaser Inspection—State which tests or inspections are to be witnessed (Section 13).
4.1.4 Samples for Product (Check) Analysis—State whether samples shall be furnished (9.2.2).
4.2 Examples of such requirements include but are not limited to the following:
4.2.1 Dimensions—See Section 8.
4.2.2 Purchaser Inspection—See Section 13.
4.2.3 Samples for Product (Check) Analysis—See Section 10.
5. Materials and Manufacture
5.1 The finish options for products certified to this specification are:
5.1.1 Hot-Finished, Annealed, and Descaled Rod,
5.1.2 Hot-Finished, Annealed, and Ground Bar,
5.1.3 Hot-Finished, Annealed, and Turned Bar,
5.1.4 Cold-Finished and Annealed Bar, and
5.1.5 Cold-Finished, Annealed, and Ground Bar.
TABLE 14 Permissible Variations in Length of Rods
Random mill 2 to 12 ft (610 to 3660 mm) long with not more than
lengths 25 weight % under 4 ft (1.22 m).
Random mill 2 ft to 12 ft (610 mm to 3660 mm) long with not more
lengths than 25 weight % under 4 ft (1.22 m).
Multiple Furnished in multiples of a specified unit length,
lengths within the length limits indicated above. For each
multiple, an allowance of ⁄4 in. (6.35 mm) shall
be made for cutting, unless otherwise specified. At
the manufacturer’s option, individual specified unit
lengths may be furnished.
Nominal Specified nominal lengths having a range of not less
lengths than 2 ft (610 mm) with no short lengths allowed.
Cut lengths A specified length to which all rods shall be cut with
a permissible variation of + ⁄8 in. (3.17
mm) − 0.
B573 − 24
5.2 The diameters permitted for certification for each finish appear in the left column of Table 3.
6. Chemical Composition
6.1 The material shall conform to the requirements as to chemical composition prescribed in Table 21.
6.2 If a product (check) analysis is made by the purchaser, the material shall conform to the requirements specified it shall be done
in Table 2 subject to the permissible tolerances in conformance with Specification B880.
7. Mechanical Properties and Other Requirements
7.1 The mechanical properties of the material at room temperature shall conform to those shown in Table 32.
8. Dimensions and Permissible Variations
8.1 Diameter—The permissible variations from the specified diameter shall be as prescribed in Table 43.
8.2 Out-of-Roundness—The permissible variation in roundness shall be as prescribed in Table 43.
8.3 Machining Allowances—When the surfaces of finished material are to be machined, the following allowances are suggested
for normal machining operations:
5 11
8.3.1 As-finished (Annealed and Descaled)—For diameters of ⁄16 in. to ⁄16 in. (7.94 to 17.46 mm) in. (7.94 mm to 17.46 mm)
incl, an allowance of ⁄16 in. (1.59 mm) in. (1.59 mm) should be added on the diameter should be made for finish machining.
A
TABLE 21 Chemical Requirements
Composition, %
Element
UNS UNS
N10242N10003 N10003N10242
Chromium 7.0-9.0 6.0–8.0
Chromium 6.0–8.0 7.0–9.0
Iron, max 2.0 5.0
Iron 5.0 2.0
Carbon 0.03 max 0.04–0.08
Carbon 0.04–0.08 0.03
Silicon, max 0.80 1.00
Silicon 1.00 0.80
Cobalt, max 1.00 0.20
Cobalt 0.20 1.00
Manganese, max 0.80 1.00
Manganese 1.00 0.80
Tungsten, max . 0.50
Vanadium, max . 0.50
Tungsten 0.50 .
Vanadium 0.50 .
Molybdenum 24.0-26.0 15.0–18.0
Molybdenum 15.0–18.0 24.0–26.0
Phosphorus, max 0.030 0.015
Phosphorus 0.015 0.030
Sulfur, max 0.015 0.020
Sulfur 0.020 0.015
Aluminumplus titanium, max . 0.50
B
Aluminum 0.50 .
Copper, max 0.50 0.35
Copper 0.35 0.50
Boron, max 0.006 0.010
Boron 0.010 0.006
Nickel remainder remainder
Aluminum, max 0.50 .
Aluminum . 0.50
A
Values in the table are maximums unless a range or minimum is indicated.
B
Includes titanium.
B573 − 24
TABLE 3 Mechanical Property Requirements
Tensile Strength, Yield Strength (0.2
Elongation in 2 in.
A
UNS min, % Offset), min, ksi
(50.8 mm) or 4D
min, %
ksi (MPa) (MPa)
N10003 100 000(690) 40 000(280) 35
N10242 105 000(725) 45 000(310) 40
TABLE 2 Mechanical Property Requirements
Tensile Strength, Yield Strength
Elongation in 2 in.
A
UNS min, (0.2 % Offset), min, (50.8 mm) or 4D
min, %
ksi (MPa) ksi (MPa)
N10003 100 (690) 40 (280) 35
N10242 105 (725) 45 (310) 40
A
4D—D refers to the diameter of the tension specimen.
8.4 Length:
8.4.1 Unless multiple, nominal, or cut lengths are specified, random mill lengths shall be furnished.
8.4.2 The permissible variations in length of multiple, nominal, or cut length rod shall be as prescribed in Table 14. Where rods
are ordered in multiple lengths, ⁄4 in. (6.35 mm) length addition shall be allowed for each uncut multiple length.
8.5 Ends:
8.5.1 Rods or bars ordered to random or nominal lengths shall be furnished with either cropped or sawed ends.
8.5.2 Rods or bars ordered to cut lengths shall be furnished with square saw cut or machined ends.
8.6 Weight—For calculation of mass or weight, the following
...