Designation:B473–96(Reapproved2002)e1
Standard Specification for
UNS N08020,UNS N08024,and UNS N08026Nickel Alloy Bar and Wire1
This standard is issued under thefixed designation B473;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.
e1N OTE—Paragraph1.3was added editorially in June2002.
1.Scope
1.1This specification2covers UNS N08020,UNS N08026, and UNS N08024bar and wire other than required for reforging.
1.2The values stated in inch-pound units are to be regarded as the standard.The values given in parentheses are for information only.
1.3This 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 Material Safety Data Sheet for this product/material as pro-vided by the manufacturer,to establish appropriate safety and health practices,and determine the applicability of regulatory limitations prior to use.
2.Referenced Documents
2.1ASTM Standards:
A262Practices for Detecting Susceptibility to Intergranu-lar Attack in Austenitic Stainless Steels3
E8Test Methods for Tension Testing of Metallic Materials4 E1473Test Methods for Chemical Analysis of Nickel, Cobalt,and High-Temperature Alloys5
3.Terminology
3.1Definitions of Terms Specific to This Standard:
3.1.1The terms bar and wire as used in this specification are described as follows:
3.1.2bars,n—hot-finished rounds,squares,octagons,and hexagons:1⁄4in.(6.35mm)and over in diameter or size.Hot-finishedflats:1⁄4to10in.(254mm),inclusive,in width,1⁄8 in.(3.175mm)and over in thickness.Cold-finished rounds, squares,octagons,hexagons,and shapes:over1⁄2in.(12.7mm) in diameter or size.Cold-finishedflats:3⁄8in.(9.525mm)and over in width(see Discussion(1)),1⁄8in.and over in thickness (see Discussion(2)).
3.1.2.1Discussion—(1)Widths less than3⁄8in.(9.525mm) and thicknesses less than3⁄16in.(
4.75mm)are generally described asflat wire.
3.1.2.2Discussion—(2)Thicknesses1⁄8in.(3.175mm)to under3⁄16in.(
4.75mm)can be cold-rolled strip as well as bar.
3.1.3wire,n—coldfinished only:round,square,octagon, hexagon,and shape wire,1⁄2in.(12.7mm)and under in diameter or size.Cold-finished only:flat wire,3⁄16in.(
4.76 mm)to under3⁄8in.(9.525mm)in width,0.010in.(0.254mm) to under3⁄16in.in thickness.
4.Ordering Information
4.1It 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:
4.1.1Quantity(weight or number of pieces),
4.1.2Name of material or UNS number,
4.1.3Form(bar or wire),
4.1.4Dimensions,
4.1.5Condition,
4.1.6Finish,
4.1.7ASTM designation and year of issue,
4.1.8Inspection(1
5.1),
4.1.9Supplementary requirements,if any,and
4.1.10If possible,the intended end use.
N OTE1—A typical ordering description is as follows:200bars,UNS N08020,1in.(25.4mm)round by10to14ft(3.0to3.6m),centerless ground,Specification B473.
1This specification is under the jurisdiction of ASTM Committee B02on
Nonferrous Metals and Alloys and is the direct responsibility of Subcommittee
B02.07on Refined Nickel and Cobalt and Their Alloys.
Current edition approved May10,1996.Published June1996.Originally
published as B473–68.Last previous edition B473–95.
2For ASME Boiler and Pressure Vessel Code applications see related Specifi-
cation SB-473in Section II of that Code.
3Annual Book of ASTM Standards,V ol01.03.
4Annual Book of ASTM Standards,V ol03.01.
5Annual Book of ASTM Standards,V ol03.05.
1
Copyright©ASTM International,100Barr Harbor Drive,PO Box C700,West Conshohocken,PA19428-2959,United States.
5.Materials and Manufacture
5.1Heat Treatment —The product of UNS N08020alloy shall be furnished in the stabilized-annealed condition.The product of UNS N08026alloy shall be furnished in the solution-annealed condition.The product of UNS N08024alloy shall be furnished in the annealed condition.
N OTE 2—The recommended annealing temperatures all followed by quenching in water or rapidly cooling by other means are as follows:1700to 1850°F (927to 1010°C)for UNS N08020,2050to 2200°F (1121to 1204°C)for UNS N08026,and 1925to 1975°F (1052to 1079°C)for UNS N08024.
6.Chemical Composition
6.1The material shall conform to the requirements as to chemical composition prescribed in Table 1.
6.2If a product (check)analysis is performed by the purchaser,the material shall conform to the product (check)analysis variations prescribed in Table 2.
7.Condition
7.1Bars shall be furnished annealed and either hot finished or cold finished.Strain-hardened material is available only as cold finished.
7.2Wire will be furnished only as annealed and cold finished.
8.Mechanical Properties
8.1The material shall conform to the applicable require-ments as to mechanical properties prescribed in Table 3.9.Dimensions and Permissible Variations
9.1Bar —Bars shall conform to the variations in dimensions prescribed in Tables 4-12,inclusive,as applicable.
9.2Wire —Wire shall conform to the permissible variations in dimensions prescribed in Tables 13-17,inclusive,as appli-cable.
10.Workmanship,Finish,and Appearance
10.1The product shall be uniform in quality and condition,smooth,commercially straight or flat,and free of injurious imperfections.
11.Sampling 11.1Lot :
11.1.1A lot for chemical analysis shall consist of one heat.
11.1.2A lot for mechanical properties shall consist of all material from the same heat,nominal diameter or thickness,of each heat-treatment charge.11.2Test Material Selection :
11.2.1Chemical Analysis —Representative samples shall be taken during pouring or subsequent processing.
11.2.1.1Check analysis shall be wholly the responsibility of the purchaser.
11.2.2Mechanical Properties —Samples of the material to provide test specimens shall be taken from such locations in each lot as to be representative of that lot.12.Number of Tests
12.1Chemical Analysis —One test per lot.12.2Mechanical Properties —One test per lot.
13.Specimen Preparation
13.1Tension test specimens shall be taken from the material after final heat treatment,and shall be selected in the longitu-dinal direction.The tension test specimens shall conform to the appropriate sections of Test Methods E 8.
14.Test Methods
14.1The chemical composition and mechanical properties of the material as enumerated in this specification shall,in case of disagreement,be determined in accordance with the follow-ing methods:
TABLE 1Chemical Requirements
Element
Composition,%
UNS N08026UNS N08020UNS N08024Carbon,max 0.030.070.03Manganese,max    1.00  2.00  1.00Phosphorus,max 0.030.0450.035Sulfur,max 0.030.0350.035Silicon,max 0.50
1.00
0.50
Nickel 33.00to 37.2032.00to 38.0035.00to 40.00Chromium 22.00to 26.0019.00to 21.0022.50to 25.00Molybdenum    5.00to 6.70  2.00to 3.00  3.50to 5.00Copper
2.00to 4.00
3.00to
4.00
0.50to 1.50Columbium (Nb)+tantalum ...
83carbon–1.000.15to 0.35Nitrogen 0.10to
...
Iron
remainder A
remainder A
remainder A
A
By difference
TABLE 2Product Analysis Tolerances
Elements
Tolerances Over the Maximum Limit or
Under the Minimum Limit UNS N08026UNS N08020UNS N08024Carbon 0.0050.010.005Manganese 0.030.040.03Phosphorus 0.0050.0050.005Sulfur 0.0050.0050.005Silicon 0.050.050.05Chromium 0.250.250.25Nickel
0.300.300.30Molybdenum
0.100.100.10Columbium (Nb)+tantalum ...0.050.05Copper 0.100.100.10Nitrogen
0.01
...
...
Test
ASTM Designations Chemical analysis E 1473A Tension
E 8
A
Iron shall be determined arithmetically by difference.
15.Inspection
15.1If specified,source inspection of the material by the purchaser at the manufacturer’s plant shall be made as agreed upon between the purchaser and the manufacturer as part of the purchase contract.
16.Rejection and Rehearing
16.1Material that fails to conform to the requirements of this specification may be rejected.Rejection should be reported to the producer or supplier promptly and in writing.In case of
dissatisfaction with the results of the test,the producer or supplier may make claim for a rehearing.17.Certification
17.1When specified in the purchase order or contract,a producer’s or supplier’s certification shall be furnished to the purchaser that the material was manufactured,sampled,tested,and inspected in accordance with this specification and has been found to meet the requirements.When specified in the purchase order or contract,a report of the test results shall be furnished.
TABLE 3Mechanical Property Requirements A
Condition
Diameter or Thickness,in.(mm)
Tensile Strength,min
Yield Strength,min Elongation in 2in.(50.8mm),min,%Reduction of area,min,%
ksi MPa ksi MPa Annealed,hot finished or cold finished
All
805513524130.0B 50.0Annealed,strain-hardened
Up to 2(50.8)incl
90
620
60
415
15.0
40.0
A For wire only,tensile strength 90to 120.0ksi (620to 830MPa);no requirements on yield strength,elongation,and reduction of area.
B
Cold-finished shapes require only 15%,minimum,elongation.editorially
TABLE 4Permissible Variations in Size of Hot-Rolled Round and Square Bars
Permissible Variations from Specified Size,in.(mm)Out-of-Round A or Out-of-Square,B
in.(mm)Over
Under
1⁄4
(6.35)to 5⁄16(7.94),incl C ,D
E
E
E
Over 5⁄16(7.94)to 7⁄16(11.11),incl C ,D 0.006(0.15)0.006(0.15)0.009(0.23)Over 7⁄16(11.11)to 5⁄8(15.88),incl C ,D 0.007(0.18)0.007(0.18)0.010(0.25)Over 5⁄8(15.88)to 7⁄8(22.22),incl 0.008(0.20)0.008(0.20)0.012(0.30)Over 7⁄8(22.22)to 1(25.40),incl 0.009(0.23)0.009(0.23)0.013(0.33)Over 1(25.40)to 11⁄8(28.58),incl 0.010(0.25)0.010(0.25)0.015(0.38)O
ver 11⁄8(28.58)to 11⁄4(31.75),incl 0.011(0.28)0.011(0.28)0.016(0.41)Over 11⁄4(31.75)to 13⁄8(34.92),incl 0.012(0.30)0.012(0.30)0.018(0.46)Over 13⁄8(34.92)to 11⁄2(38.10),incl 0.014(0.36)0.014(0.36)0.021(0.53)Over 11⁄2(38.10)to 2(50.80),incl 1⁄64(0.40)1⁄64(0.40)0.023(0.58)Over 2(50.80)to 21⁄2(63.50),incl 1⁄32(0.79)00.023(0.58)Over 21⁄2(63.50)to 31⁄2(88.90),incl 3⁄64(1.19)00.035(0.89)Over 31⁄2(88.90)to 41⁄2(114.30),incl 1⁄16(1.59)00.046(1.17)†Over 41⁄2(114.30)to 51⁄2(139.70),incl 5⁄64(1.98)00.058(1.47)Over 51⁄2(139.70)to 61⁄2(165.10),incl 1⁄8(3.18)00.070(1.78)Over 61⁄2(165.10)to 8(203.20),incl
5⁄32(3.97)0
0.085
(2.18)
A
Out-of-round is the difference between the maximum and minimum diameters of the bar,measured at the same cross section.
B
Out-of-square section is the difference in the two dimensions at the same cross section of a square bar,each dimension being the distance between opposite faces.C
Size tolerances have not been evolved for rounds in the size range of 1⁄4to 5⁄16in.(6.35to 7.94mm),inclusive.Size tolerances have not been evolved for round sections in the size range of 1⁄ approximately 5⁄8in.(6.35to 15.88mm)in diameter which are produced on rod mills in coils.D
Variations in size of coiled product made on rod mills are greater than size tolerances for product made on bar mills.E
Squares in this size are not produced as hot-rolled products.†Editorially corrected.
TABLE 5Permissible Variations in Size of Hot-Rolled Hexagonal and Octagonal Bars
Specified Sizes Measured Between Opposite Sides,
in.(mm)
Permissible Variations from Specified Size,in.(mm)
Maximum Difference in 3Measurements for
Hexagons only,in.(mm)Over Under 1⁄4
(6.35)to 1⁄2(12.70),incl
0.007(0.18)0.007(0.18)0.011(0.28)Over 1⁄2(12.70)to 1(25.40),incl 0.010(0.25)0.010(0.25)0.015(0.38)Over 1(25.40)to 11⁄2(38.10),incl 0.021(0.53)0.021(0.53)0.025(0.64)Over 11⁄2(38.10)to 2(50.80),incl 1⁄32(0.79)1⁄32(0.79)1⁄32(0.79)Over 2(50.80)to 21⁄2(63.50),incl 3⁄64(1.19)3⁄64(1.19)3⁄64(1.19)Over 21⁄2(63.50)to 31⁄2(88.90),incl
1⁄16(1.59)
1⁄16(1.59)
1⁄16
(1.59)
18.Product Marking
18.1Each bundle or box shall be properly tagged with metal tags showing heat number,grade,condition,specification number and size to assure proper identification.19.Packaging and Package Marking
19.1Bars or wire shall be bundled or boxed in such a manner as to assure safe delivery to their destination when properly transported by any common carrier.
20.Keywords
20.1bar;UNS N08020;UNS N08024;UNS N08026;wire
TABLE6Permissible Variations in Thickness and Width for Hot-Rolled Flat Bars
Specified Width,in.(mm)
Permissible Variations in Thickness for Thicknesses Given,in.(mm)
1⁄8(3.18)to1⁄2(12.70),incl Over1⁄2(12.70)to1(25.40),incl Over1(25.40)to2(50.80),incl Over Under Over Under Over Under
To1(25.40),incl0.008(0.20)0.008(0.20)0.010(0.25)0.010(0.25)......
Over1(25.40)to2(50.80),incl0.012(0.30)0.012(0.30)0.015(0.38)0.015(0.38)0.031(0.79)0.031(0.79) Over2(50.80)to4(101.60),incl0.015(0.38)0.015(0.38)0.020(0.51)0.020(0.51)0.031(0.79)0.031(0.79) Over4(101.60)to6(152.40),incl0.015(0.38)0.015(0.38)0.020(0.51)0.020(0.51)0.031(0.79)0.031(0.79) Over6(152.40)to8(203.20),incl0.016(0.41)0.016(0.41)0.025(0.64)0.025(0.64)0.031(0.79)0.031(0.79) Over8(203.20)to10(254.00),incl0.021(0.53)0.021(0.53)0.031(0.79)0.031(0.79)0.031(0.79)0.031(0.79)
Over2(50.80)to4(101.60),incl Over4(101.60)to6(152.40),incl Over6(152.40)to8(203.20),incl
Over Under Over Under Over Under
To1(25.40),
Over1(25.40)to2(50.80),
Over2(50.80)to4(101.60),incl0.062(1.57)0.031(0.79)............
Over4(101.60)to6(152.40),incl0.062(1.57)0.031(0.79)0.093(2.36)0.062(1.57)......
Over6(152.40)to8(203.20),incl0.062(1.57)0.031(0.79)0.093(2.36)0.062(1.57)0.125(3.18)0.156(3.96) Over8(203.20)to10(154.00),incl0.062(1.57)0.031(0.79)0.093(2.36)0.062(1.57)0.125(3.18)0.156(3.96)
Specified Width,in.(mm)Permissible Variations in Width,in.(mm)
Over Under
To1(25.40),incl0.015(0.38)0.015(0.38) Over1(25.40)to2(50.80),incl0.031(0.79)0.031(0.79) Over2(50.80)to4(101.60),incl0.062(1.57)0.031(0.79) Over4(101.60)to6(152.40),incl0.093(2.36)0.062(1.57) Over6(152.40)to8(203.20),incl0.125(3.18)0.156(3.96) Over8(203.20)to10(254.00),incl0.156(3.96)0.187(4.75) TABLE7Permissible Variations in Size of Cold-Finished Round
Bars
Specified Size,in.(mm)Permissible Variations from Specified
Size,in.(mm)A,B
Over Under
Over1⁄2(12.70)to1(25.40),excl0.002(0.05)0.002(0.05)
1(25.40)to11⁄2(38.10),excl0.0025(0.06)0.0025(0.06)
11⁄2(38.10)to4(101.60),incl C0.003(0.08)0.003(0.08)
A Unless otherwise specified,size tolerances are over and under as shown in the above table.When required,however,they may be specified all over and nothing under,or all under and nothing over,or any combination of over and under, if the total spread in size tolerance for a specified size is not less than the total spread shown in the table.
B When it is necessary to heat treat or heat treat and pickle after coldfinishing, size tolerances are double those shown in the table.
C Cold-finished bars over4in.(101.60mm)in diameter are produced;size tolerances for such bars have not been evolved.
TABLE8Permissible Variations in Size of Cold-Finished
Hexagonal,Octagonal,and Square Bars
Specified Size,in.(mm)Permissible Variations from Specified
Size,in.(mm)A
Over Under
Over1⁄2(12.70)to1(25.40),incl00.004(0.10) Over1(25.40)to2(50.80),incl00.006(0.15) Over2(50.80)to3(76.20),incl00.008(0.20) Over3(76.20)00.010(0.25)
A When it is necessary to heat treat or heat treat and pickle after coldfinishing, size tolerances are double those shown in the table.TABLE9Permissible Variations in Width and Thickness of Cold-
Finished Flat Bars
Width,in.(mm)
Permissible Variations in Width,over
and under,in.(mm)A
For Thicknesses
1⁄4(6.35)and
Under
For Thicknesses
Over1⁄4
(6.35)
3⁄8(9.52)to1(25.40),incl0.004(0.10)0.002(0.05) Over1(25.40)to2(50.80),incl0.006(0.15)0.003(0.08) Over2(50.80)to3(76.20),incl0.008(0.20)0.004(0.10) Over3(76.20)to41⁄2(114.30),incl0.010(0.25)0.005(0.13)
Thickness,in.(mm)
Permissible Variations in Thickness,over
and under,in.(mm)A
1⁄8(3.18)to1(25.40),incl0.002(0.05)
Over1(25.40)to2(50.80),incl0.003(0.08)
Over2(50.80)to3(76.20),incl0.004(0.10)
Over3(76.20)to41⁄2(114.30),incl B0.005(0.13)
A When it is necessary to heat treat and pickle after coldfinishing,size tolerances are double those shown in the table.
B Cold-finishedflat bars over41⁄2in.(114.30mm)wide or thick are produced; width and thickness tolerances for such bars have not been
evolved.
TABLE10Permissible Variations in Length of Hot-Finished or
Cold-Finished Bars
N OTE1—The order should specify random lengths or specific lengths. When random lengths are ordered,the length tolerance is not less than24 in.(609.60mm).When specific lengths are ordered,Table10or Table11 shall apply.
Specified Size of Rounds, Squares,Hexagons,and Octagons and Widths of Flats,A in.(mm)
Permissible Variations in Length,in.(mm) For Lengths Up to12ft
(3,658mm),incl
For Lengths Over12
(3,658mm)to25ft
(7,620mm),incl Over Under Over Under
To2(50.80),incl1⁄2(12.70)03⁄4(19.05)0 Over2(50.80)to4(101.60),
incl
3⁄4(19.05)01(25.40)0 Over4(101.60)to6
(152.40),incl
Over6(152.40)to9(228.60),
incl
1(25.40)011⁄4(31.75)0 Over9(228.60)to12
(304.80),incl11⁄4(31.75)011⁄2(38.10)0
11⁄2(38.10)02(50.80)0
A The maximum width of barflats is10in.(254.00mm).
TABLE11Permissible Variations in Length of Hot-Finished or Cold-Finished Bars Machine Cut After Machine Straightening
N OTE1—The order should specify random lengths or specific lengths. When random lengths are ordered,the length tolerance is not less than24 in.(609.60mm).When specific lengths are ordered.Table10or Table11 shall apply.
Specified Size of Rounds, Squares,Hexagons,and Octagons and Widths of Flats,A in.(mm)For Lengths Up to12
ft(3,658mm),incl
For Lengths Over12
(3,658mm)to25ft
(7,620mm),incl Over Under Over Under
To3(76.20),incl1⁄8(3.18)03⁄16(4.76)0 Over3(76.20)to6(152.40),
incl
3⁄16(4.76)01⁄4(6.35)0 Over6(152.40)to9(228.60),
incl
Over9(228.60)to12
(304.80),incl
1⁄4(6.35)05⁄16(7.94)0
1⁄2(12.70)01⁄2(12.70)0 A The maximum width of barflats is10in.(254.00mm).
TABLE12Permissible Variations in Straightness of Machine Straightened Hot-Finished or Cold-Finished Bars Measurement is taken on the concave side of the bar with a straight edge. Unless otherwise specified,hot-finished or cold-finished bars for machining purposes are furnished machine straightened to the following tolerances:
Hotfinished:
1⁄8in.(3.18mm)in any5ft(1524mm),but may not exceed1⁄8in.(3.18 mm)3(length in feet(mm))/(5ft(1524mm))
Coldfinished:
1⁄16in.(1.59mm)in any5ft(1524mm),but may not exceed1⁄16in.(1.59 mm)3(length in feet(mm))/(5ft(1524mm))
TABLE13Diameter and Out-of-Round Tolerances for Round Wire(Drawn,Polished,Centerless Ground,Centerless Ground
and Polished)ABC
Specified Diameter,in.(mm)
Diameter Tolerance,in.(mm)
Over Under
0.5000(12.70)0.002(0.05)0.002(0.05) Under0.5000(12.70)to0.3125(7.94),incl0.0015(0.04)0.0015(0.04) Under0.3125(7.94)to0.0440(1.12),incl0.001(0.03)0.001(0.03) Under0.0440(1.12)to0.0330(0.84),incl0.0008(0.02)0.0008(0.02) Under0.0330(0.84)to0.0240(0.61),incl0.0005(0.013)0.0005(0.013) Under0.0240(0.61)to0.0120(0.30),incl0.0004(0.010)0.0004(0.010) Under0.0120(0.30)to0.0080(0.20),incl0.0003(0.008)0.0003(0.008) Under0.0080(0.20)to0.0048(0.12),incl0.0002(0.005)0.0002(0.005) Under0.0048(0.12)to0.0030(0.08),incl0.0001(0.003)0.0001(0.003)
A Diameter tolerances are over and under as given in this table.Also,round wire can be produced to tolerances all over and nothing under,or all under and nothing over,or any combination over and under,
if the total spread in diameter tolerances for a specified diameter is not less than the total spread given in this table.
B The maximum out-of-round tolerance for round wire is one half of the total size tolerance given in this table.
C When it is necessary to heat treat after coldfinishing because of special mechanical property requirements,tolerances are commonly double those shown.
TABLE14Size Tolerances for Drawn Wire in Hexagons,
Octagons,and Squares
Specified Size,A in.(mm)
Size Tolerance,in.(mm)
Over Under
1⁄2(12.70)00.004(0.10) Under1⁄2(12.70)to5⁄16(7.94),incl00.003(0.08) Under(7.94)to1⁄8(3.18),incl00.002(0.05) A Distance across
flats.

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