ASTM B872-19

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: B872 − 06 (Reapproved 2016) B872 − 19
Standard Specification for
Precipitation-Hardening Nickel Alloys Plate, Sheet, and
Strip
This standard is issued under the fixed designation B872; 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 rolled precipitation hardenable nickel-iron-chromium-columbium (Nb)-titanium-aluminum alloy
(N09908) nickel-iron-chromium-niobium-titanium-aluminum alloy (N09908), nickel-chromium-molybdenum-copper-titanium-
niobium alloy (N09925), nickel-chromium-molybdenum-niobium-titanium alloy (N07725) and nickel-chromium-cobalt-titanium-
niobium alloy (N07740) plate, sheet, and strip in the annealed condition (temper). This alloyAlloy N09908 is used as sheathing
for super conductor cables, as tooling for fabrication of such cables, and for other applications requiring a material with low
coefficient-of-expansion properties. Alloys N09925 and N07725 are used in sour service conditions in oil and gas applications.
Alloy N07740 is used in the construction of high temperature boilers, pressure vessels, and heat exchangers.
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 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 safety, health, and healthenvi-
ronmental 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:
E8 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
E228 Test Method for Linear Thermal Expansion of Solid Materials With a Push-Rod Dilatometer
E1473 Test Methods for Chemical Analysis of Nickel, Cobalt and High-Temperature Alloys
3. Terminology
3.1 Definitions of Terms Specific to This Standard:
3.1.1 The terms given in Table 1 shall apply.
4. Ordering Information
4.1 Orders for material under this specification should include the following information:
4.1.1 Alloy—Name or UNS number (see Table 2).
4.1.2 ASTM designation and year of issue.
4.1.3 Condition—See 6.1 and Appendix X1.
4.1.4 Finish—See Appendix X1.
4.1.5 Dimensions—Thickness, width, and length.
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, 2016Nov. 1, 2019. Published June 2016November 2019. Originally approved in 1996. Last previous edition approved in 20112016 as
B872 – 11.B872 – 06 (2016). DOI: 10.1520/B0872-06R16.10.1520/B0872-19.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. 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
B872 − 19
TABLE 1 Product Description
Product Thickness, in. (mm) Width
A B
3 1
Hot-rolled plate ⁄16 to 2 ⁄4 (4.8 to 57.2) (Table 4) Table 6 and
Table 7
C
Cold-rolled sheet 0.010 to 0.250 (0.25 to 6.4), incl Table 8
(Table 5)
C
Cold-rolled strip 0.005 to 0.250 (0.13 to 6.4), incl Table 8
(Table 5)
A 3 1
Material ⁄16 to ⁄4 in. (4.8 to 6.4 mm), incl, in thickness may be furnished as sheet
or plate provided the material meets the specification requirements for the
condition ordered.
B
Hot-rolled plate, in widths 10 in. (250 mm) and under, may be furnished as
hot-finished rectangles with sheared or cut edges provided the mechanical
property requirements of this specification are met.
C
Material under 48 in. (1219 mm) in width may be furnished as sheet or strip
provided the material meets the specification requirements for the condition
ordered.
4.1.6 Quantity.
4.1.7 Optional Requirements:
4.1.7.1 Sheet and Strip—Whether to be furnished in coil, in cut straight lengths, or in random straight lengths.
4.1.7.2 Strip—Whether to be furnished with commercial slit edge, square edge, or round edge.
4.1.7.3 Plate—Whether to be furnished specially flattened (see 7.7); also how plate is to be cut (see 7.2.1 and 7.3.2).
4.1.8 Fabrication Details—Not mandatory but helpful to the manufacturer:
4.1.8.1 Welding or Brazing—Process to be employed.
4.1.8.2 Plate—Whether material is to be hot-formed.
4.1.9 Certification—State if certification or a report of test results is required (see Section 15).
4.1.10 Samples for Product (Check) Analysis—Whether samples should be furnished (see 5.2).
4.1.11 Purchaser Inspection—If the purchaser wishes to witness the tests or inspection of material at the place of manufacture,
the purchase order must so state indicating which tests or inspections are to be witnessed (see Section 13).
5. Chemical Composition
5.1 The material shall conform to the requirements as to chemical composition prescribed in Table 2.
5.2 If a product (check) analysis is performed by the purchaser, the material shall conform to the product (check) analysis
variations prescribed in Table 2.
6. Mechanical and Other Requirements
6.1 Tensile Properties—The material after precipitation hardening shall conform to the tensile properties prescribed in Table 3.
6.2 Coeffıcient of Thermal Expansion:
− 6
6.2.1 The mean coefficient of thermal expansion from 77°F (25°C) to 1292°F (700°C) shall not exceed 7.8 × 10 in./in./°F
−6
(14.0 × 10 cm/cm/°C).
6.2.2 The inflection temperature shall not exceed 572°F (300°C).
7. Dimensions and Permissible Variations
7.1 Thickness and Weight:
7.1.1 Plate—The permissible variation under the specified thickness and permissible excess in overweight shall not exceed the
amounts prescribed in Table 4.
3 3
7.1.1.1 For use with Table 4, plate shall be assumed to weigh 0.292 lb/in. (8.08 g/cm ).
7.1.2 Sheet and Strip—The permissible variations in thickness of sheet and strip shall be as prescribed in Table 5. The thickness
of strip and sheet shall be measured with the micrometer spindle ⁄8 in. (9.5 mm) or more from either edge for material 1 in. (25.4
mm) or over in width and at any place on the strip under 1 in. in width.
7.2 Width or Diameter:
7.2.1 Plate—The permissible variations in width of rectangular plates and diameter of circular plates shall be as prescribed in
Table 6 and Table 7.
7.2.2 Sheet and Strip—The permissible variations in width for sheet and strip shall be as prescribed in Table 8.
7.3 Length:
7.3.1 Sheet and strip of all sizes may be ordered to cut lengths, in which case a variation of ⁄8 in. (3.2 mm) over the specified
length shall be permitted.
7.3.2 Permissible variations in length of rectangular plate shall be as prescribed in Table 9.
B872 − 19
TABLE 2 Chemical Requirements
Product (Check) Analysis
Composition Limits, % Composition Limits, % Composition Limits, % Composition Limits, % Variations, Under min or
Element
N09908 N09925 N07725 N07740 Over max, of the Specified
Limit of Element
Nickel 47.0 min 42.0 min 55.0 min Remainder 0.35
51.0 max 46.0 max 59.0 max 0.35
Chromium 3.75 min 19.5 min 19.0 min 23.5 min 0.10
4.5 max 22.5 max 22.5 max 25.5 max 0.10
A A
Iron remainder 22.0 min remainder 3.0 max .
Manganese, max 1.0 1.0 0.35 1.0 0.03
Carbon . . . 0.005 min 0.01
Carbon, max 0.03 0.03 0.03 0.01
0.03 max 0.03 max 0.03 max 0.08 max
Copper . 1.5 min . . 0.03
0.5 max 3.0 max . 0.50 max
Silicon, max 0.5 0.5 0.20 1.0 0.03
Sulfur, max 0.005 0.03 0.010 0.030 0.003
Aluminum 0.75 min 0.1 min . 0.2 min 0.10
1.25 max 0.5 max 0.35 max 2.0 max 0.10
Titanium 1.20 min 1.9 min 1.00 min 0.5 min 0.05
1.80 max 2.40 max 1.70 max 2.5 max 0.05
Columbium (Nb) 2.7 min . 2.75 min 0.10
C B
Niobium 2.7 min . 2.75 min 0.50 min 0.10
B
3.3 max 0.5 max 4.00 max 2.5 max 0.15
Phosphorus 0.015 max 0.03 0.015 0.030 max 0.005
Boron . . . 0.0006 min 0.005
Boron 0.012 max . . 0.005
0.012 max . . 0.006 max
Cobalt . . . 15.0 min 0.03
Cobalt 0.5 max . . 0.03
0.5 max . . 22.0 max
Molybdenum . 2.5 min 7.00 min . 0.15
... 3.5 max 9.50 max 2.0 max 0.15
A
Iron shall be determined arithmetically by difference.
B
Niobium (Nb) + Tantalum (Ta).
C
The terms Niobium (Nb) and Columbium (Cb) are alternate names for the same element.
A
TABLE 3 Tensile Properties for Plate, Sheet, and Strip
Yield Strength Elongation in 2 in.
Nominal Thickness, Tensile Strength,
(0.2 % offset), or 50 mm (or 4D),
in. (mm) min, ksi (MPa)
min, ksi (MPa) min %
B
N09908
Up to 1.0 (25.4), incl 170 (1172) 120 (827) 12
Over 1.0 to 2.25 170 (1172) 120 (827) 10
(25.4 to 57.2), incl
C
N09925
Up to 1.0 (25.4), incl 140 (965) 105 (724) 18
Over 1.0 to 2.25 140 (965) 105 (724) 18
(25.4 to 57.2), incl
D
N07725
Up to 1.0 (25.4), incl 150 (1034) 120 (827) 20
Over 1.0 to 2.25 150 (1034) 120 (827) 20
(25.4 to 57.2), incl
E
N07740
Up to 1.0 (25.4), incl 150 (1034) 90 (621) 20
Over 1.0 to 2.25 150 (1034) 90 (621) 20
(25.4 to 57.2), incl
A
Material shall be supplied in the annealed condition (temper). The manufacturer
shall demonstrate that annealed material is capable of meeting the properties
prescribed in Table 3 after precipitation heat treatment.
B
Precipitation heat treatment for N09908 shall consist of heating to 1292°F
(700°C), holding at temperature for 50 h, and then air cooling.
C
Precipitation heat treatment for N09925 consists of 1365°F (740°C), hold at
temperature for 6 to 9 h, furnace cool to 1150°F (621°C), hold until total
precipitation heat treatment time has reached 18 h, air cool or faster.
D
Precipitation heat treatment for N07725 consists of 1350°F (732°C) for 8 h
followed by furnace cooling to 1500 to 1200°F (621 to 649°C), holding 8 h, and air
cooling.
E
Precipitation heat treatment for N07740 consists of holding between 1400°F
(760°C) and 1500°F (816°C) for a minimum of 4 h with an additional ⁄2 h of time
added for each additional inch of thickness exceeding 2 in. followed by air cooling.
B872 − 19
TABLE 4 Permissible Variations in Thickness and Overweight of Rectangular Plates
NOTE 1—All plates shall be ordered to thickness and not to weight per square foot (centimetre). No plates shall vary more than 0.01 in. (0.25 mm)
A
under the thickness ordered, and the overweight of each lot in each shipment shall not exceed the amount in the table. Spot grinding is permitted to
remove surface imperfections, such spots not to exceed 0.01 in. (0.25 mm) under the specified thickness.
B,C
Permissible Excess in Average Weight per Square Foot of Plates for Widths Given in Inches (Millimetres) Expressed in Percent-
age of Nominal Weights
Specified Thickness,
48 to 60 60 to 72 72 to 84 84 to 96 96 to 108 108 to 120 120 to 132 132 to 144 144 to 160
in. (mm)
Under 48
(1220 to (1520 to (1830 to (2130 to (2440 to (2740 to (3050 to (3350 to (3660 to
(1220)
1520), excl 1830), excl 2130), excl 2440), excl 2740), excl 3050), excl 3350), excl 3660), excl 4070), incl
3 5
⁄16 to ⁄16 (4.8 to 7.9), excl 9.0 10.5 12.0 13.5 15.0 16.5 18.0 . . .
5 3
⁄16 to ⁄8 (7.9 to 9.5), excl 7.5 9.0 10.5 12.0 13.5 15.0 16.5 18.0 . .
3 7
⁄8 to ⁄16 (9.5 to 11.1), excl 7.0 7.5 9.0 10.5 12.0 13.5 15.0 16.5 18.0 19.5
7 1
⁄16 to ⁄2 (11.1 to 12.7), excl 6.0 7.0 7.5 9.0 10.5 12.0 13.5 15.0 16.5 18.0
1 5
⁄2 to ⁄8 (12.7 to 15.9), excl 5.0 6.0 7.0 7.5 9.0 10.5 12.0 13.5 15.0 16.5
5 3
⁄8 to ⁄4 (15.9 to 19.1), excl 4.5 5.5 6.0 7.0 7.5 9.0 10.5 12.0 13.5 15.0
⁄4 to 1 (19.1 to 25.4), excl 4.0 4.5 5.5 6.0 7.0 7.5 9.0 10.5 12.0 13.5
1 to 2 ⁄4 (25.4 to 57.2), incl 5.0 5.0 5.5 6.5 7.0 8.0 8.5 10.0 11.5 13.0
A
The term “lot” applied to this table means all of the plates of each group width and each group thickness.
B
The permissible overweight for lots of circular and sketch plates shall be 25 % greater than the amounts given in this table.
C
The weight of individual plates shall not exceed the nominal weight by more than 1 ⁄4 times the amount given in this table and Table Footnote B.
TABLE 5 Permissible Variations in Thickness of Sheet and Strip
NOTE 1—Permissible variations, plus and minus, in thickness, in. (mm), for widths given in in. (mm).
Sheet
Hot-Rolled Cold-Rolled
Specified Thickness, in. (mm)
Over 48 to 60 (1220 to 1520), Over 48 to 60 (1220 to
A A
48 (1220) and Under 48 (1220) and Under
A A
incl 1520), incl
0.018 to 0.025 (0.46 to 0.64), incl 0.003 (0.08) 0.004 (0.10) 0.002 (0.05) 0.003 (0.08)
Over 0.025 to 0.034 (0.64 to 0.86), incl 0.004 (0.10) 0.005 (0.13) 0.003 (0.08) 0.004 (0.10)
Over 0.034 to 0.043 (0.86 to 1.1), incl 0.005 (0.13) 0.006 (0.15) 0.004 (0.10) 0.005 (0.13)
Over 0.043 to 0.056 (1.1 to 1.4), incl 0.005 (0.13) 0.006 (0.15) 0.004 (0.10) 0.005 (0.13)
Over 0.056 to 0.070 (1.4 to 1.8), incl 0.006 (0.15) 0.007 (0.18) 0.005 (0.13) 0.006 (0.15)
Over 0.070 to 0.078 (1.8 to 2.0), incl 0.007 (0.18) 0.008 (0.20) 0.006 (0.15) 0.007 (0.18)
Over 0.078 to 0.093 (2.0 to 2.4), incl 0.008 (0.20) 0.009 (0.23) 0.007 (0.18) 0.008 (0.20)
Over 0.093 to 0.109 (2.4 to 2.8), incl 0.009 (0.23) 0.010 (0.25) 0.007 (0.18) 0.009 (0.23)
Over 0.109 to 0.125 (2.8 to 3.2), incl 0.010 (0.25) 0.012 (0.31) 0.008 (0.20) 0.010 (0.25)
Over 0.125 to 0.140 (3.2 to 3.6), incl 0.012 (0.31) 0.014 (0.36) 0.008 (0.20) 0.010 (0.25)
Over 0.140 to 0.171 (3.6 to 4.3), incl 0.014 (0.36) 0.016 (0.41) 0.009 (0.23) 0.012 (0.31)
Over 0.171 to 0.187 (4.3 to 4.8), incl 0.015 (0.38) 0.017 (0.43) 0.010 (0.25) 0.013 (0.33)
Over 0.187 to 0.218 (4.8 to 5.5), incl 0.017 (0.43) 0.019 (0.48) 0.011 (0.28) 0.015 (0.38)
Over 0.218 to 0.234 (5.5 to 5.9), incl 0.018 (0.46) 0.020 (0.51) 0.012 (0.31) 0.016 (0.41)
Over 0.234 to 0.250 (5.9 to 6.4), incl 0.020 (0.51) 0.022 (0.56) 0.013 (0.33) 0.018 (0.46)
Cold-Rolled Strip
A
Specified Thickness, in. (mm) Widths 12 in. (305 mm) and Under, ±
Up to 0.050 (1.3), incl 0.0015 (0.04)
Over 0.050 to 0.093 (1.3 to 2.4), incl 0.0025 (0.06)
B
Over 0.093 to 0.125 (2.4 to 3.2), incl 0.004 (0.11)
A
Measured ⁄8 in. (9.5 mm) or more from either edge except for strip under 1 in. (25.4 mm) in width, which is measured at any place.
B
Standard sheet tolerances apply for thicknesses over 0.125 in. (3.2 mm) and for all thicknesses of strip over 12 in. (305 mm) wide.
7.4 Straightness:
7.4.1 The edgewise curvature (depth of chord) of flat sheet, strip, and plate shall not exceed 0.05 in. multiplied by the length
of the product in feet (0.04 mm multiplied by the length of the product in centimetres).
7.4.2 Straightness for coiled strip material is subject to agreement between the manufacturer and the purchaser.
7.5 Edges:
7.5.1 When finished edges of strip are specified in the contract or purchase order, the following descriptions shall apply:
7.5.1.1 Square-edge strip shall be supplied with finished edges, with sharp, square corners, and without bevel or rounding.
7.5.1.2 Round-edge strip shall be supplied with finished edges, semicircular in form, and the diameter of the circle forming the
edge being equal to the strip thickness.
7.5.1.3 When no description of any required form of strip edge is given, it shall be understood that edges such as those resulting
from slitting or shearing will be acceptable.
7.5.1.4 Sheet shall have sheared or slit edges.
7.5.1.5 Plate shall have sheared or cut (machined, abrasive-cut, powder-cut, or inert-arc-cut) edges, as specified.
B872 − 19
A B,C
TABLE 6 Permissible Variations in Width of Sheared, Plasma-Torch-Cut, and Abrasive-Cut Rectangular Plate
Permissible Variations in Widths for Widths Given, in. (mm)
Up to 30 (760), incl Over 30 to 72 (760 Over 72 to 108 (1830 Over 108 to 144 (2740 Over 144 to 160 (3660
Specified Thickness
to 1830), incl to 2740), incl to 3660), incl to 4070), incl
Plus Minus Plus Minus Plus Minus Plus Minus Plus Minus
Inches
D
Sheared:
3 5 3 1 1 1 3 1 1 1
⁄16 to ⁄16, excl ⁄16 ⁄8 ⁄4 ⁄8 ⁄8 ⁄8 ⁄2 ⁄8 . .
5 1 1 1 3 1 3 1 1 1 5 1
⁄16 to ⁄2, excl ⁄4 ⁄8 ⁄8 ⁄8 ⁄8 ⁄8 ⁄2 ⁄8 ⁄8 ⁄8
1 3 3 1 3 1 1 1 5 1 3 1
⁄2 to ⁄4, excl ⁄8 ⁄8 ⁄8 ⁄8 ⁄2 ⁄8 ⁄8 ⁄8 ⁄4 ⁄8
3 1 1 1 1 5 1 3 1 7 1
⁄4 to 1, excl ⁄2 ⁄8 ⁄2 ⁄8 ⁄8 ⁄8 ⁄4 ⁄8 ⁄8 ⁄8
1 5 1 5 1 3 1 7 1 1
1 to 1 ⁄4, incl ⁄8 ⁄8 ⁄8 ⁄8 ⁄4 ⁄8 ⁄8 ⁄8 1 ⁄8
E, F
Abrasive-cut:
3 1 1 1 1 1 1 1 1 1 1 1
⁄16 to 1 ⁄4, incl ⁄8 ⁄8 ⁄8 ⁄8 ⁄8 ⁄8 ⁄8 ⁄8 ⁄8 ⁄8
1 1 3 1 3 1 3 1 3 1 3 1
over 1 ⁄4 to 2 ⁄4 , incl ⁄16 ⁄8 ⁄16 ⁄8 ⁄16 ⁄8 ⁄16 ⁄8 ⁄16 ⁄8
G
Plasma-torch-cut:
3 1 3 3 3 3 3
⁄16 to 1 ⁄2, excl ⁄4 0 ⁄4 0 ⁄4 0 ⁄4 0 ⁄4
...