ASTM B425-99
(Specification)Standard Specification for Ni-Fe-Cr-Mo-Cu Alloy (UNS N08825 and UNS N08221) Rod and Bar
Standard Specification for Ni-Fe-Cr-Mo-Cu Alloy (UNS N08825 and UNS N08221) Rod and Bar
SCOPE
1.1 This specification covers nickel-iron-chromium-molybdenum-copper alloy (UNS N08825 and UNS N08221)* in the form of hot-finished and cold-drawn rounds, squares, hexagons, and rectangles.
1.2 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only.
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 problems, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Designation: B 425 – 99
Standard Specification for
Ni-Fe-Cr-Mo-Cu Alloy (UNS N08825 and UNS N08221)* Rod
and Bar
This standard is issued under the fixed designation B 425; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope 3. Terminology
1.1 This specification covers nickel-iron-chromium- 3.1 Definitions of Terms Specific to This Standard:
molybdenum-copper alloy (UNS N08825 and UNS N08221)* 3.1.1 bar—material of rectangular (flats), hexagonal, or
in the form of hot-finished and cold-drawn rounds, squares, square solid section up to and including 10 in. (254 mm) in
hexagons, and rectangles. width and ⁄8 in. (3.2 mm) and over in thickness in straight
1.2 The values stated in inch-pound units are to be regarded lengths.
as the standard. The values given in parentheses are for 3.1.1.1 Discussion—Hot-worked rectangular bar in widths
information only. 10in.(254mm)andundermaybefurnishedashot-rolledplate
1.3 The following precautionary caveat pertains only to the with sheared or cut edges in accordance with Specification
test methods portion, Section 12, of this specification: This B 424, provided the mechanical property requirements of this
standard does not purport to address all of the safety problems, specification are met.
if any, associated with its use. It is the responsibility of the user 3.1.2 rod—material of round solid section furnished in
of this standard to establish appropriate safety and health straight lengths.
practices and determine the applicability of regulatory limita-
4. Ordering Information
tions prior to use.
4.1 It is the responsibility of the purchaser to specify all
2. Referenced Documents
requirements that are necessary for the safe and satisfactory
2.1 ASTM Standards: performance of material ordered under this specification.
B 424 Specification for Ni-Fe-Cr-Mo-Cu Alloy (UNS Examples of such requirements include, but are not limited to,
N08825 and UNS N08221) Plate, Sheet, and Strip the following:
B 880 Specification for General Requirements for Chemical 4.1.1 ASTM designation and date of issue,
Check Analysis Limits for Nickel, Nickel Alloys and 4.1.2 UNS number,
Cobalt Alloys 4.1.3 Section—Rod (round) or bar (square, hexagonal, or
E 8 Test Methods forTensionTesting of Metallic Materials rectangular),
E 29 Practice for Using Significant Digits in Test Data to 4.1.4 Dimensions, including length,
Determine Conformance with Specifications 4.1.5 Condition (see Appendix X1),
E 1473 Test Methods for Chemical Analysis of Nickel, 4.1.6 Finish (see Appendix X1),
Cobalt, and High-Temperature Alloys 4.1.7 Quantity—Feet (or metres) or number of pieces,
4.1.8 Certification—State if certification is required (Sec-
tion 15),
4.1.9 Samples for Product (Check) Analysis—State whether
This specification is under the jurisdiction of ASTM Committee B-2 on
samples for product (check) analysis should be furnished (see
Nonferrous Metals and Alloys and is the direct responsibility of Subcommittee
5.2), and
B02.07 on Refined Nickel and Cobalt and Their Alloys.
Current edition approved May 10, 1999. Published July 1999. Originally
4.1.10 Purchaser Inspection—If purchaser wishes to wit-
published as B 425 – 64 T. Last previous edition B 425 – 93.
ness tests or inspection of material at place of manufacture, the
* New designation established in accordance with Practice E 527 and SAE
purchase order must so state, indicating which test or inspec-
J 1086, Practice for Numbering Metals and Alloys (UNS).
For ASME Boiler and Pressure Vessel Code applications, see related Specifi- tions are to be witnessed (Section 13).
cation SB-425 in Section II of that code.
Annual Book of ASTM Standards, Vol 02.04.
5. Chemical Composition
Annual Book of ASTM Standards, Vol 03.01.
5 5.1 The material shall conform to the composition limits
Annual Book of ASTM Standards, Vol 14.02.
Annual Book of ASTM Standards, Vol 03.06. specified in Table 1.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
B425–99
TABLE 1 Chemical Requirements TABLE 3 Permissible Variations in Diameter or Distance
Between Parallel Surfaces of Cold-Worked Rod and Bar
Element UNS N08825 UNS N08221
Permissible Variations From
Nickel 38.0–46.0 39.0–46.0
Specified Dimension, in.
Specified Dimension, in. (mm)
Chromium 19.5–23.5 20.0–22.0
A
(mm)
A
Iron 22.0 min balance
Plus Minus
Manganese 1.0 max 1.0 max
Rounds:
Carbon 0.05 max 0.025 max
1 3
⁄16 (1.6) to ⁄16 (4.8), excl 0 0.002 (0.05)
Copper 1.5–3.0 1.5–3.0
3 1
⁄16 (4.8) to ⁄2(12.7), excl 0 0.003 (0.08)
Silicon 0.5 max 0.5 max
1 15
⁄2 (12.7) to ⁄16(23.8), incl 0.001 (0.03) 0.002 (0.05)
Sulfur 0.03 max 0.03 max
15 15
Over ⁄16 (23.8) to 1 ⁄16 (49.2), incl 0.0015 (0.04) 0.003 (0.08)
Aluminum 0.2 max 0.2 max
15 1
Over 1 ⁄16 (49.2) to 2 ⁄2 (63.5), incl 0.002 (0.05) 0.004 (0.10)
Titanium 0.6–1.2 0.6–1.0
Hexagons, squares, rectangles:
Molybdenum 2.5–3.5 5.0–6.5
⁄2 (12.7) and less 0 0.004 (0.10)
A
1 7
Element shall be determined arithmetically by difference.
Over ⁄2 (12.7) to ⁄8(22.2), incl 0 0.005 (0.13)
7 1
Over ⁄8 (22.2) to 1 ⁄4(31.8), incl 0 0.007 (0.18)
Over 1 ⁄4 (31.8) to 2 (50.8), incl 0 0.009 (0.23)
5.2 If a product (check) analysis is performed by the
A
Dimensions apply to diameter of rounds, to distance between parallel
purchaser, it shall be done per B 880 and the material shall
surfaces of hexagons and squares, and separately to width and thickness of
rectangles.
conform to the product (check) analysis variations defined in
Table 1 of B 880.
TABLE 4 Permissible Variations in Diameter or Distance
6. Mechanical Properties and Other Requirements
Between Parallel Surfaces of Hot-Worked Rod and Bar
6.1 Mechanical Properties—The material shall conform to Permissible Variations From
Specified Dimension, in.
Specified Dimension, in. (mm)
the mechanical properties specified in Table 2. A
(mm)
Plus Minus
7. Dimensions and Permissible Variations
Rod and bar, hot-worked:
1 (25.4) and under 0.016 (0.41) 0.016 (0.41)
7.1 Diameter, Thickness, or Width—The permissible varia-
over 1 (25.4) to 2 (50.8), incl 0.031 (0.79) 0.016 (0.41)
tions from the specified dimensions as measured on the
over 2 (50.8) to 4 (101.6), incl 0.047 (1.19) 0.031 (0.79)
over 4 (101.6) 0.125 (3.18) 0.063 (1.60)
diameter or between parallel surfaces of cold-worked rod and
Rod, rough-turned or ground:
barshallbeasprescribedinTable3,andofhot-workedrodand
Under 1 (25.4) 0.005 (0.13) 0.005 (0.13)
bar as prescribed in Table 4.
1 (25.4) and over 0.031 (0.79) 0
B
7.2 Out-of-Round—Hot-worked rods and cold-worked rods Forging quality rod:
Under 1 (25.4) 0.005 (0.13) 0.005 (0.13)
(except“forgingquality”)allsizes,instraightlengths,shallnot
1 (25.4) and over 0.031 (0.79) 0
be out-of-round by more than one half the total permissible
B
Spot grinding is permitted to remove minor surface imperfections. The depth
variations in diameter shown inTable 3 andTable 4, except for
of these spot ground areas shall not exceed 3 % of the diameter of the rod.
hot-worked rods ⁄2 in. (12.7 mm) in diameter and under, which
may be out-of-round by the total permissible variations in
7.6.1 The permissible variations in straightness of cold-
diameter shown in Table 4.
worked rod and bar as determined by the departure from
7.3 Corners—Cold-worked bars will have practically exact
straightness shall be as prescribed in Table 7.
angles and sharp corners.
7.6.2 The permissible variations in straightness of hot-
7.4 Machining Allowances for Hot-Worked Materials—
worked rod and bar as determined by the departure from
When the surfaces of hot-worked products are to be machined,
straightness shall be as specified in Table 8.
the allowances prescribed in Table 5 are recommended for
normal machining operations.
8. Workmanship, Finish, and Appearance
7.5 Length—The permissible variations in length of cold-
8.1 The material shall be uniform in quality and condition,
worked and hot-worked rod and bar shall be as prescribed in
smooth, commercially straight or flat, and free of injurious
Table 6.
imperfections.
7.5.1 Rods and bars ordered to random or nominal lengths
will be furnished with either cropped or saw-cut ends; material
9. Sampling
ordered to cut lengths will be furnished with square saw-cut or
machined ends. 9.1 Lot—Definition:
7.6 Straightness: 9.1.1 A lot for chemical analysis shall consist of one heat.
TABLE 2 Mechanical Properties (Rod and Bar)
Yield Strength Elongation in 2
Tensile Strength
Alloy Condition 0.2 % offset, min, in.or50mmor
min, ksi (MPa)
D
ksi (MPa) 4 , min,%
A
UNS N08825 Annealed: 85 (586) 35 (241) 30
Hot-finished, cold–drawn
BBB
Forging Quality:
UNS N08221 All sizes annealed 79 (544) 34 (235) 30
A
Not applicable to diameters or cross sections under ⁄32 in. (2.4 mm).
B
Forging quality is furnished to chemical requirements and surface inspection only. No tensile properties are required.
B425–99
TABLE 5 Normal Machining Allowances for Hot-Worked Material
Normal Machining Allowance, in. (mm)
Finished-Machined Dimensions
Distance Between
For Rectangular Bar
for Finishes As Indicated Below,
On Diameter, Parallel Surfaces,
A
in. (mm)
for Rods for Hexagonal
On Thickness On Width
and Square Bars
B
Hot-worked:
7 1 1 1 3
Up to ⁄8 (22.2), incl ⁄8(3.2) ⁄8(3.2) ⁄8(3.2) ⁄16(4.8)
7 7 1 3 1 3
Over ⁄8 to 1 ⁄8 (22.2 to 47.6), incl ⁄8(3.2) ⁄16(4.8) ⁄8(3.2) ⁄16(4.8)
7 7 3 1 3
Over 1 ⁄8 to 2 ⁄8(47.6 to 73.0), incl. ⁄16(4.8) ⁄4(6.4) . ⁄16(4.8)
7 13 1 3
Over 2 ⁄8 to 3 ⁄16(73.0 to 96.8), incl ⁄4(6.4) . . ⁄16(4.8)
13 1 3
Over 3 ⁄16 (96.8) ⁄4(6.4) . . ⁄8(9.5)
C
Hot-worked rods, rough-turned or rough ground:
15 1
⁄16 to 4 (23.8 to 101.6), incl in diameter ⁄16(1.6) . . .
Over 4 to 12 (101.6 to 304.8), incl in diameter ⁄8(3.2) . . .
A
Dimensions apply to diame
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