ASTM A356/A356M-21

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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: A356/A356M − 16 A356/A356M − 21
Standard Specification for
Steel Castings, Carbon, Low Alloy, and Stainless Steel,
Heavy-Walled for Steam Turbines
This standard is issued under the fixed designation A356/A356M; 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*
1.1 This specification covers one grade of martensitic stainless steel and several grades of ferritic steel castings for cylinders
(shells), valve chests, throttle valves, and other heavy-walled castings for steam turbine applications.
1.2 Optional supplementary requirements (S1 through S5) shall apply as selected by and specified by the purchaser.
1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each
system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the
two systems may result in nonconformance with the standard.
1.2.1 Within the text, the SI units are shown in brackets.
1.3 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:
A370 Test Methods and Definitions for Mechanical Testing of Steel Products
A488/A488M Practice for Steel Castings, Welding, Qualifications of Procedures and Personnel
A941 Terminology Relating to Steel, Stainless Steel, Related Alloys, and Ferroalloys
E94E94/E94M Guide for Radiographic Examination Using Industrial Radiographic Film
E125 Reference Photographs for Magnetic Particle Indications on Ferrous Castings
E165E165/E165M Practice for Liquid Penetrant Testing for General Industry
E186 Reference Radiographs for Heavy-Walled (2 to 4 ⁄2 in. (50.8 to 114 mm)) Steel Castings
E280 Reference Radiographs for Heavy-Walled (4 ⁄2 to 12 in. (114 to 305 mm)) Steel Castings
E446 Reference Radiographs for Steel Castings Up to 2 in. (50.8 mm) in Thickness
E709 Guide for Magnetic Particle Testing
2.2 Manufacturers’Manufacturers Standardization Society of the Valve and Fittings Industry Standard:
SP-55 Quality Standard for Steel Castings for Valves, Flanges, Fittings, and Other Piping Components (Visual Method)
This specification is under the jurisdiction of ASTM Committee A01 on Steel, Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee A01.18
on Castings.
Current edition approved Dec. 1, 2016May 1, 2021. Published January 2017May 2021. Originally approved in 1952. Last previous edition approved in 2016 as
A356/A356M – 11 (2016).A356/A356M – 16. DOI: 10.1520/A0356_A0356M-16.10.1520/A0356_A0356M-21.
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.
Available from Manufacturers Standardization Society of the Valve and Fittings Industry (MSS), 127 Park St., NE, Vienna, VA 22180-4602, http://www.mss-hq.org.
*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
A356/A356M − 21
3. Classification
3.1 The castings are furnished in the grades shown in Table 1.
4. Ordering Information
4.1 Orders for material to this specification should include the following information:
4.1.1 A description of the casting by pattern number or drawing (dimensional tolerances shall be included on the casting drawing),
4.1.2 Grade of steel,
4.1.3 Options in the specification, and
4.1.4 The supplementary requirements desired, including the standards of acceptance.
A
TABLE 1 Chemical Requirements
Composition, %
Grade/ Material Phosphorus,
Carbon Manganese Silicon Sulfur, max Molybdenum Chromium NickelVanadium
UNS Number max
B B
1 carbon steel 0.35 max 0.70 max 0.60 max 0.035 0.030 . . . . . . . . . . . . . . . . . .
J03502
B B
2 ⁄2 % molybdenum 0.25 max 0.70 max 0.60 max 0.035 0.030 0.45-0.65 . . . . . . . . . . . . . . .
J12523
B B
1 1
5 ⁄2 % chromium, ⁄2 0.25 max 0.70 max 0.60 max 0.035 0.030 0.40-0.60 0.40-0.70 . . . . . . . . . . . .
J12540 % molybdenum
6 1 ⁄4 % chromium, 0.20 max 0.50-0.80 0.60 max 0.035 0.030 0.45-0.65 1.00-1.50 . . . . . . . . . . . .
J12073 ⁄2 % molybdenum
8 1 % chromium, 1 0.20 max 0.50-0.90 0.20-0.60 0.035 0.030 0.90-1.20 1.00-1.50 . . . 0.05-0.15 . . . . . .
J11697 % molybdenum,
vanadium
9 1 % chromium, 1 0.20 max 0.50-0.90 0.20-0.60 0.035 0.030 0.90-1.20 1.00-1.50 . . . 0.20-0.35 . . . . . .
J21610 % molybdenum,
vanadium
10 2 ⁄4 % chromium, 1 0.20 max 0.50-0.80 0.60 max 0.035 0.030 0.90-1.20 2.00-2.75 . . . . . . . . . . . .
J22090 % molybdenum
CA6NM martensic 0.06 max 1.00 max 1.00 max 0.040 0.030 0.4-1.0 11.5-14.0 3.5-4.5 . . . . . . . . .
J91540 chromium nickel
A,B
TABLE 1 Chemical Composition Requirements
Element, %
Grade
Type
(UNS Number)
Carbon Manganese Phosphorus Sulfur Silicon Nickel Chromium Molybdenum Vanadium
C C
1 Carbon Steel 0.35 0.70 0.035 0.030 0.60 . . . . . . . . . . . .
(J03502)
C C
2 0.5Mo 0.25 0.70 0.035 0.030 0.60 . . . . . . 0.45–0.65 . . .
(J12523)
C C
5 0.5Cr-0.5Mo 0.25 0.70 0.035 0.030 0.60 . . . 0.40–0.70 0.40–0.60 . . .
(J12540)
6 1.25Cr-0.5Mo 0.20 0.50–0.80 0.035 0.030 0.60 . . . 1.00–1.50 0.45–0.65 . . .
(J12073)
8 1Cr-1Mo-V 0.20 0.50–0.90 0.035 0.030 0.20–0.60 . . . 1.00–1.50 0.90–1.20 0.05–0.15
(J11697)
9 1Cr-1Mo-V 0.20 0.50–0.90 0.035 0.030 0.20–0.60 . . . 1.00–1.50 0.90–1.20 0.20–0.35
(J21610)
10 2.25Cr-1Mo 0.20 0.50–0.80 0.035 0.030 0.60 . . . 2.00–2.75 0.90–1.20 . . .
(J22090)
CA6NM Martensitic Cr-Ni 0.06 1.00 0.040 0.030 1.00 3.5–4.5 11.5–14.0 0.4–1.0 . . .
(J91540)
A
Where ellipses appear in this table, there is no requirement and the element need not be analyzed for or reported.
B
All values are maximums unless a range is provided.
C
For each 0.01 % reduction in carbon below the maximum specified, an increase of 0.04 percentage points of manganese over the maximum specified for that element
will be permitted up to 1.00.
A356/A356M − 21
5. Melting Process
5.1 The steel shall be made by the open-hearth or electric-furnace process.
5.2 Deoxidation Practice:
5.2.1 Deoxidation of the carbon and low-alloy steel grades shall be by manganese and silicon. Furnace or ladle deoxidation with
other agents is permissible with the approval of the purchaser.
5.2.2 The purchaser may specify that no aluminum be added.
5.2.3 Vacuum deoxidation is acceptable. The specific method shall be subject to approval by the purchaser.
6. Heat Treatment
6.1 Preliminary Heat Treatment—The castings Castings of any grade in this specification may receive such preliminary heat
treatment as the founder may elect to employ.
6.2 Heat Treatment for Final Properties: Mechanical Properties (Grades 1, 2, 5, 6, 8, 9, and 10):
6.2.1 Normalizing—The castings shall be heated to and held at the proper temperature for a sufficient time to effect the desired
transformation and withdrawn from the furnace and allowed to cool to effect complete transformation.
6.2.2 Tempering—The casting shall be heated to and held at the proper temperature, which shall be below the transformation
range, and then cooled under suitable conditions. The tempering temperature shall not be less than 1100 °F [595 °C].
6.2.3 Stress Relieving—The stress relieving operation shall be carried out in the same manner as tempering. The temperature shall
be within 50 °F [28 °C], but not exceeding the final tempering temperature.
6.3 Stainless Steel Casting: Casting (CA6NM only in this specification):
6.3.1 Normalizing—The castings shall be heated to 1850 °F [1010 °C] minimum, held sufficiently at that temperature to uniformly
heat the castings, and air cooled to below 200 °F [93 °C].
6.3.2 Tempering—The castings shall be final tempered from 1050 to 1150 °F [565 to 620 °C].
6.3.3 Stress Relieving—The stress relieving operation shall be performed in the same manner as tempering. Temperature shall be
between 1050 °F [565 °C] and 1150 °F [620 °C].
7. Chemical Composition
7.1 The steel shall conform to the requirements given in Table 1.
8. Tensile Requirements
8.1 Tensile properties shall conform to the requirements listed in Table 2 as determined by the test specimen set forth in Section
9.
8.2 Tension tests shall be performed in accordance with Test Methods and Definitions A370.
9. Number of Tests and Retests
9.1 One tension test shall be made from each heat in each heat-treatment chargelot and from each casting on which attached
coupons are specified. The bar from which the test specimen is taken shall be heat treated with the casting represented.
9.2 If any test specimen shows defective machining or develops flaws, it shall be discarded and another specimen substituted from
the same heat.
A356/A356M − 21
TABLE 2 Tensile Requirements
Elongation in 2 Reduction of
Tensile Strength, Yield Strength,
Grade Material in. [50 mm] Area, min,
min, ksi [MPa] min, ksi [MPa]
min, % %
1 carbon steel 70 [485] 36 [250] 20.0 35.0
2 ⁄2 % molybdenum 65 [450] 35 [240] 22.0 35.0
1 1
5 ⁄2 % chromium, ⁄2 % 70 [485] 40 [275] 22.0 35.0
molybdenum
1 1
6 1 ⁄4 % chromium, ⁄2 % 70 [485] 45 [310] 22.0 35.0
molybdenum
8 1 % chromium, 1 % 80 [550] 50 [345] 18.0 45.0
molybdenum, vanadium
9 1 % chromium, 1 % 85 [585] 60 [415] 15.0 45.0
molybdenum, vanadium
10 2 ⁄4 % chromium, 1 % 85 [585] 55 [380] 20.0 35.0
molybdenum
CA6NM martensitic chromium nickel 110 [760] 80 [550] 15.0 35.0
A
TABLE 2 Tensile Requirements
Elongation in 2 in. Reduction of
Tensile Strength, Yield Strength,
Grade Type [50 mm], Area,
ksi [MPa] ksi [MPa]
% %
1 Carbon Steel 70 [485] 36 [250] 20.0 35.0
2 0.5Mo 65 [450] 35 [240] 22.0 35.0
5 0.5Cr-0.5Mo 70 [485] 40 [275] 22.0 35.0
6 1.25Cr-0.5Mo 70 [485] 45 [310] 22.0 35.0
8 1Cr-1Mo-V 80 [550] 50 [345] 18.0 45.0
9 1Cr-1Mo-V 85 [585] 60 [415] 15.0 45.0
10 2.25Cr-1Mo 85 [585] 55 [380] 20.0 35.0
CA6NM Martensitic Cr-Ni 110 [760] 80 [550] 15.0 35.0
A
All values are minimums.
9.3 If the results of the mechanical tests for any lot or casting do not conform to the requirements specified, the founder may reheat
treat and retest such lot or casting.
10. Test Specimen
10.1 Tension test specimens and samples for microexamination an optional (Supplementary Requirement S1) micro-examination
may be taken from coupons conforming substantially to the dimensions shown in Fig. 1 and from the locations in the coupon as
indicated in Fig. 1. These coupons sh
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