ASTM B620-98a
(Specification)Standard Specification for Nickel-Iron-Chromium-Molybdenum Alloy (UNS N08320) Plate, Sheet, and Strip
Standard Specification for Nickel-Iron-Chromium-Molybdenum Alloy (UNS N08320) Plate, Sheet, and Strip
SCOPE
1.1 This specification covers rolled nickel-iron-chromium-molybdenum alloy (UNS N08320)* plate, sheet, and strip, for use in general corrosive service.
1.2 The following products are covered under this specification:
1.2.1 Sheet and Strip -Hot or cold rolled, solution annealed, and descaled unless solution anneal is performed in an atmosphere yielding a bright finish.
1.2.2 Plate- Hot rolled, solution annealed, and descaled.
1.3 The values stated in inch-pound units are to be regarded as the standard.
General Information
Relations
Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn. Contact ASTM
International (www.astm.org) for the latest information.
Designation: B 620 – 98a
Standard Specification for
Nickel-Iron-Chromium-Molybdenum Alloy (UNS N08320)
Plate, Sheet, and Strip
This standard is issued under the fixed designation B 620; 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 E 1473 Test Methods for Chemical Analysis of Nickel,
2 Cobalt, and High-Temperature Alloys
1.1 This specification covers rolled nickel-iron-chromium-
molybdenum alloy (UNS N08320)* plate, sheet, and strip, for
3. Terminology
use in general corrosive service.
3.1 Definitions of Terms Specific to This Standard:
1.2 The following products are covered under this specifi-
3.1.1 plate—material ⁄16 in. (4.76 mm) and over in thick-
cation:
ness.
1.2.1 Sheet and Strip—Hot or cold rolled, solution an-
3.1.2 sheet and strip—material under ⁄16in. (4.76 mm) in
nealed, and descaled unless solution anneal is performed in an
thickness.
atmosphere yielding a bright finish.
1.2.2 Plate—Hot rolled, solution annealed, and descaled.
4. Ordering Information
1.3 The values stated in inch-pound units are to be regarded
4.1 It is the responsibility of the purchaser to specify all
as the standard.
requirements that are necessary for the safe and satisfactory
performance of material ordered under this specification.
2. Referenced Documents
Examples of such requirements include, but are not limited to,
2.1 ASTM Standards:
the following:
B 880 Specification for General Requirements for Chemical
4.1.1 Dimensions—Thickness (in decimals of an inch),
Check Analysis Limits for Nickel, Nickel Alloys and
3 width, and length (inch or fraction of an inch).
Cobalt Alloys
4.1.2 Certification—State if certification or a report of test
E 8 Test Methods forTensionTesting of Metallic Materials
results is required (Section 15).
E 18 Test Methods for Rockwell Hardness and Rockwell
4 4.1.3 Optional Requirement:
Superficial Hardness of Metallic Materials
4.1.3.1 Plate—State how plate is to be cut (see 7.8.1 and
E 29 Practice for Using Significant Digits in Test Data to
5 Table 1).
Determine Conformance with Specifications
4.1.4 Purchase Inspection—State which tests or inspections
E 55 PracticeforSamplingWroughtNonferrousMetalsand
6 are to be witnessed (Section 13).
Alloys for Determination of Chemical Composition
4.1.5 Samples for Product (Check) Analysis—State
E 140 HardnessConversionTablesforMetals(Relationship
whether samples should be furnished (9.2.2).
Between Brinell Hardness, Vickers Hardness, Rockwell
Hardness, Rockwell Superficial Hardness, and Knoop
5. Chemical Composition
Hardness)
5.1 The material shall conform to the composition limits
specified in Table 2.
5.2 If a product (check) analysis is made by the purchaser,
This specification is under the jurisdiction of ASTM Committee B-2 on
Nonferrous Metals and Alloys and is the direct responsibility of Subcommittee
the material shall conform to the requirements specified in
B02.07 on Refined Nickel and Cobalt and Their Alloys.
Table 2 subject to the permissible tolerances per B 880.
Current edition approved Oct. 10, 1998. Published November 1998. Originally
published as B620 – 77. Last previous edition B620 – 93.
2 6. Mechanical Properties and Other Requirements
For ASME Boiler and Pressure Vessel Code applications see related Specifi-
cation SB-620 in Section II of that Code.
6.1 Tensile Properties—The material shall conform to the
* New designation established in accordance withASTM E527 and SAE J1086,
room temperature tensile properties prescribed in Table 3.
Recommended Practice for Numbering Metals and Alloys (UNS).
Annual Book of ASTM Standards, Vol 02.04.
Annual Book of ASTM Standards, Vol 03.01.
Annual Book of ASTM Standards, Vol 14.02.
6 7
Annual Book of ASTM Standards, Vol 03.05. Annual Book of ASTM Standards, Vol 03.06.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn. Contact ASTM
International (www.astm.org) for the latest information.
B 620
TABLE 1 Permissible Variations in Width and Length of Sheared,
7.2.1 Plate—The permissible variations in thickness of
Plasma-Torch-Cut, or Abrasive Cut Rectangular Plate
plate shall be as prescribed in Table 4.
Permissible Variations in
7.2.2 Sheet and Strip—The permissible variations in thick-
Widths and Lengths for Di-
ness of sheet and strip shall be as prescribed in Table 5. The
mensions Given, in. (mm)
thickness shall be measured with the micrometer spindle ⁄8 in.
Specified Thickness
Up to 30 Over 30 (760),
(9.525 mm) or more from any edge for material 1 in. (25.4
(760), incl incl
mm) or over in width and at any place on material under 1 in.
+−+−
in width.
Inches
7.3 Width:
Sheared:
7.3.1 Plate—The permissible variations in width of rectan-
3 5 3 1 1 1
⁄16 to ⁄16, excl ⁄16 ⁄8 ⁄4 ⁄8
5 1 1 1 3 1
gular plates shall be as prescribed in Table 1.
Over ⁄16 to ⁄2, incl ⁄4 ⁄8 ⁄8 ⁄8
Abrasive cut:
7.3.2 Sheet and Strip—The permissible variations in width
3 1 1 1 1 1
⁄16 to 1 ⁄2, incl ⁄16 ⁄16 ⁄16 ⁄16
for sheet and strip shall be as prescribed in Table 6.
1 1 1 1 1 1
Over 1 ⁄2 to 2 ⁄2, ⁄8 ⁄8 ⁄8 ⁄8
incl 7.4 Length:
A
Plasma-Torch-Cut:
7.4.1 Plate—Permissible variations in the length of rectan-
3 1 1
⁄16 to 2, excl ⁄2 0 ⁄2 0
gular plate shall be as prescribed in Table 1.
5 5
2to3,incl ⁄8 0 ⁄8 0
7.4.2 SheetandStrip—Sheetandstripmaybeorderedtocut
Millimetres
lengths, in which case a variation of ⁄8 in. (3.175 mm) over the
Sheared:
specified length shall be permitted with a zero minus tolerance
4.76 to 7.94, incl 4.76 3.18 6.35 3.18
7.5 Straightness:
Over 7.94 to 12.70, 6.35 3.18 9.52 3.18
incl
7.5.1 The edgewise curvature (depth of cord) of flat sheet,
Abrasive cut:
strip, and plate shall not exceed 0.05 in. multiplied by the
4.76 to 38.1, incl 1.59 1.59 1.59 1.59
Over 38.1 to 63.5, 3.18 3.18 3.18 3.18 length in feet or 0.04 mm multiplied by the length in centime-
incl
tres.
A
Plasma-Torch-Cut:
7.5.2 Straightness for coiled strip is subject to agreement
4.8 to 50.8, excl 12.7 0 12.7 0
50.8 to 76.2, incl 15.9 0 15.9 0 between the manufacturer and the purchaser.
A
7.6 Squareness (Sheet)—For sheets of all thicknesses and
The tolerance spread shown for plasma-torch-cutting may be obtained all on
the minus side, or divided between the plus and the minus side if so specified by
widthsof6in.(152.4mm)ormore,theanglebetweenadjacent
the purchaser.
sides shall be 90 6 0.15 deg ( ⁄16 in./24 in. or 2.6 mm/m).
7.7 Flatness—Plate, sheet, and strip shall be commercially
TABLE 2 Chemical Requirements
flat.
Element Composition Limits, %
7.8 Edges:
Nickel 25.0–27.0
7.8.1 Plate shall have sheared or abrasive cut or plasma-
A
Iron remainder
torch-cut edges as specified.
Chromium 21.0–23.0
7.8.2 Sheet and strip shall have sheared or slit edges.
Molybdenum 4.0–6.0
Manganese, max 2.5
Carbon, max 0.05
A
TABLE 4 Permissible Variations in Thickness of Plate
Titanium, min 4 3 carbon
Silicon, max 1.00
Permissible Variations in Thickness,
Phosphorus, max 0.04 BC
in. (mm)
Specified Thickness, in. (mm)
Sulfur, max 0.03
+− ⁄32
A
See 12.1.1.
0.021 (0.53) 0.010 (0.25)
(4.76 to 5.56), incl
TABLE 3 Mechanical Property Requirements 7 1
Over ⁄32 to ⁄4 0.024 (0.61) 0.010 (0.25)
(5.56 to 6.35), incl
Elongation in 2
1 3
Tensile Yield Strength Rockwell
Over ⁄4 to ⁄8 0.027 (0.69) 0.010 (0.25)
in.
B
Strength min, (0.2 % Offset) Hardness,
(6.35 to 9.52), incl
(50.8 mm) or
3 1
psi (MPa) min, psi (MPa) max
A Over ⁄8 to ⁄2 0.030 (0.76) 0.010 (0.25)
4D min, %
(9.52 to 12.70), incl
75 000 (517) 28 000 (193) 35 95 HRB
1 5
Over ⁄2 to ⁄8 0.035 (0.89) 0.010 (0.25)
A
D refers to the diameter of the tension specimen.
(12.70 to 15.88), incl
B
Hardness values are shown for information purposes only and are not to be 5 3
Over ⁄8 to ⁄4 0.040 (1.02) 0.010 (0.25)
used as a basis for rejection or acceptance. For approximate hardness conver-
(15.88 to 19.05), incl
sions, see Hardness Conversion Tables E 140.
3 7
Over ⁄4 to ⁄8 0.045 (1.14) 0.010 (0.25)
(19.05 to 22.22), incl
Over ⁄8 to 1 0.050 (1.27) 0.010 (0.25)
(22.22 to 25.4), incl
6.2 Hardness—The hardness values given in Table 3 are
D
Over 1 to 2 ⁄2 5 0.010 (0.25)
informative only.
(25.4 to 63.5), inc
...
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