Astm A351

Designation: A 351/A 351M 05
Standard Specification for
Castings, Austenitic, for Pressure-Containing Parts1

This standard is issued under the fixed designation A 351/A 351M; 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.
This standard has been approved for use by agencies of the Department of Defense.
2. Referenced Documents
2.1 ASTM Standards: 3
A 216/A 216M Specification for Steel Castings, Carbon,
Suitable for Fusion Welding, for High-Temperature Service
A 217/A 217M Specification for Steel Castings, Martensitic
Stainless and Alloy, for Pressure-Containing Parts, Suitable for High-Temperature Service
A 488/A 488M Practice for Steel Castings, Welding, Qualification of Procedures and Personnel
A 703/A 703M Specification for Steel Castings, General
Requirements, for Pressure-Containing Parts
A 995/A 995M Specification for Castings, AusteniticFerritic (Duplex) Stainless Steel, for Pressure-Containing
Parts
E 165 Test Method for Liquid Penetrant Examination
E 709 Guide for Magnetic Particle Examination
2.2 Manufacturers Standardization Society of the Valve and
Fittings Industry Standard:4
SP-55 Quality Standard for Steel Castings for Valves,
Flanges, and Fittings and Other Components (Visual
Method)
1. Scope*
1.1 This specification2 covers austenitic steel castings for
valves, flanges, fittings, and other pressure-containing parts
(Note 1).
NOTE 1Carbon steel castings for pressure-containing parts are covered by Specification A 216/A 216M, low-alloy steel castings by Specification A 217/A 217M, and duplex stainless steel castings by Specification A 995/A 995M.
1.2 A number of grades of austenitic steel castings are

included in this specification. Since these grades possess
varying degrees of suitability for service at high temperatures
or in corrosive environments, it is the responsibility of the
purchaser to determine which grade shall be furnished. Selection will depend on design and service conditions, mechanical
properties, and high-temperature or corrosion-resistant characteristics, or both.
1.2.1 Because of thermal instability, Grades CE20N, CF3A,
CF3MA, and CF8A are not recommended for service at
temperatures above 800F [425C].
1.2.2 Because of embrittlement phases, Grade CD4MCu is
not recommended for service at temperatures above 600F
[316C].
1.3 The values stated in either inch-pound units or SI units
are to be regarded separately as standard. Within the text, the
SI units are shown in brackets. The values stated in each
system are not exact equivalents; therefore, each system must
be used independently of the other. Combining values from the
two systems may result in nonconformance with the specification.
3. General Conditions for Delivery

3.1 Material furnished to this specification shall conform to
the requirements of Specification A 703/A 703M, including
any supplementary requirements that are indicated in the
purchase order. Failure to comply with the general requirements of Specification A 703/A 703M constitutes nonconformance with this specification. In case of conflict between the
requirements of this specification and Specification A 703/
A 703M, this specification shall prevail.
1
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 May 1, 2005. Published May 2005. Originally
approved in 1952. Last previous edition approved in 2003 as A 351/A 351M 03.
2
For ASME Boiler and Pressure Vessel Code applications, see related Specification SA-351/SA-351M in Section II of that code.
3
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 standards Document Summary page on
the ASTM website.
4
Available from Manufacturers Standardization Society of the Valve and Fittings
Industry (MSS), 127 Park St., NE, Vienna, VA 22180-4602.
*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.
A 351/A 351M 05
3.2 The post weld heat treatment requirements of Supplementary Requirement S11 may be specified when austenitic
castings other than HK, HT, or CT15C are to be subjected to
severe corrosive service.
7. Chemical Composition
7.1 The steel shall conform to the requirements as to
chemical composition prescribed in Table 2.
8. Tensile Properties
8.1 Steel used for the castings shall conform to the requirements as to tensile properties prescribed in Table 3.
4. Ordering Information
4.1 The inquiry and order should include or indicate the
following:
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 Supplementary requirements desired, including the
standards of acceptance.
9. Quality
9.1 The surface of the casting shall be examined visually
and shall be free of adhering sand, scale, cracks, and hot tears.
Other surface discontinuities shall meet the visual acceptance
standards specified in the order. Visual Method SP-55 or other
visual standards may be used to define acceptable surface
discontinuities and finish. Unacceptable visual surface discontinuities shall be removed and their removal verified by visual
examination of the resultant cavities.
9.2 When additional inspection is desired, Supplementary
Requirements S5, S6, and S10 may be ordered.
9.3 The castings shall not be peened, plugged, or impregnated to stop leaks.
5. Process
5.1 The steel shall be made by the electric furnace process
with or without separate refining such as argon-oxygen decarburization (AOD).
6. Heat Treatment
6.1 All castings shall receive a heat treatment at the temperature specified in Table 1, followed by a quench in water or
rapid cool by other means except as noted.
as-cast
1900
as-cast
1040
10. Repair by Welding

10.1 Repairs shall be made using procedures and welders
qualified under Practice A 488/A 488M.
10.2 Weld repairs shall be inspected to the same quality
standards that are used to inspect the castings. When castings
are produced with Supplementary Requirement S5 specified,
weld repairs on castings that have leaked on hydrostatic test, or
on castings in which the depth of any cavity prepared for repair
welding exceeds 20 % of the wall thickness or 1 in. [25 mm],
whichever is smaller, or on castings in which any cavity
prepared for welding is greater than approximately 10 in.2[65
cm2], shall be radiographed to the same standards that are used
to inspect the castings. When castings are produced with
Supplementary Requirement S6 specified, weld repairs shall be
inspected by liquid penetrant examination to the same standards that are used to inspect the castings.
1950
2050
2100
1065
1120
1150
NOTE 3When austenitic steel castings are to be used in services

where they will be subject to stress corrosion, the purchaser should so
indicate in his order and such castings should be solution-heat treated
following all weld repairs.
2225
1220
NOTE 2Proper heat treatment of these alloys is usually necessary to

enhance corrosion resistance and in some cases to meet mechanical
properties. Minimum heat-treat temperatures are specified; however, it is
sometimes necessary to heat-treat at higher temperatures, hold for some
minimum time at temperature, and then rapidly cool the castings in order
to enhance the corrosion resistance and meet mechanical properties.
TABLE 1 Heat-Treatment Requirements

Temperature, min
Grade
HK30, HK40, HT30, CT15C
CF3, CF3A, CF8, CF8A, CF3M,
CF3MA, CF8M, CF3MN, CG3M, CF10,
CF10M, CG8M
CF10SMnN, CF8C, CF10MC
CN7M, CG6MMN, CE8MN
CK3MCuN, CN3MN, CH8, CH10, CH20,
CK20
CE20NA
11. Keywords
11.1 austenitic stainless steel; pressure containing parts;
stainless steel; steel castings
Grade shall be quenched in water or the castings may be furnace cooled to

2050F [1120C] minimum, held for 15 min minimum and then quenched in water
or rapidly cooled by other means.
A 351/A 351M 05
TABLE 2 Chemical Requirements
NOTECD4MCu and CD3MWCuN have been deleted from this specification and added to Specification A 995/A 995M. They may now be supplied
and purchased in compliance with Specification A 995/A 995M as grades 1B and 6A respectively.
Element, %
(max, except where
range is
given)
CF3,
CF3A
J92700
CF8,
CF8A
J92600
CF3M,
CF3MA
J92800
CF8M
J92900
Carbon
0.03
0.08
0.03
0.08
Manganese
1.50
1.50
1.50
Silicon
2.00
2.00
Sulfur
0.040
Phosphorus
Chromium
CF3MN
J92804
CF8C
J92710
CF10
J92950
CF10M
J92901
CH8
J93400
CH10
J93401
CH20
J93402
CK20
J94202
HK30
J94203
HK40
J94204
0.03
0.08
1.50
1.50
0.04
0.10
1.50
0.08
1.50
0.04
0.10
1.50
1.50
0.04
0.10
1.50
0.04
0.20
1.50
0.04
0.20
1.50
0.25
0.35
1.50
0.35
0.45
1.50
1.50
1.50
1.50
2.00
2.00
1.50
1.50
2.00
2.00
1.75
1.75
1.75
0.040
0.040
0.040
0.040
0.040
0.040
0.040
0.040
0.040
0.040
0.040
0.040
0.040
0.040
0.040
0.040
0.040
0.040
0.040
0.040
0.040
0.040
0.040
0.040
0.040
0.040
0.040
17.0
21.0
8.0
12.0
0.50
18.0
21.0
8.0
11.0
0.50
18.0
21.0
9.0
12.0
2.0
3.0
...
17.0
21.0
9.0
13.0
2.0
3.0
...
18.0
21.0
9.0
12.0
0.50
18.0
21.0
8.0
11.0
0.50
22.0
26.0
12.0
15.0
0.50
22.0
26.0
12.0
15.0
0.50
22.0
26.0
12.0
15.0
0.50
23.0
27.0
19.0
22.0
0.50
23.0
27.0
19.0
22.0
0.50
23.0
27.0
19.0
22.0
0.50
...
18.0
21.0
9.0
12.0
2.0
3.0
...
...
...
...
...
...
...
Molybdenum
Columbium
(niobium)
Vanadium
...
...
17.0
21.0
9.0
13.0
2.0
3.0
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
Nitrogen
...
...
...
...
0.10
0.20
...
...
...
...
...
...
...
...
...
Copper
...
...
...
...
...
...
...
...
...
...
...
...
...
...
Iron
...
...
...
...
...
...
...
...
...
...
...
...
...
...
CN7M
N08007
CN3MN
J94651
CE8MN
CG6MMN
J93790
0.08
0.06
0.08
0.10
1.00
1.50
1.50
4.00
6.00
1.00
0.040
0.030
0.040
22.5
25.5
8.0
11.0
3.0
4.5
...
Nickel
Element, %
(max, except where
range is
given)
Carbon
HT30
N08030
CF10MC
0.10
0.07
Manganese
0.25
0.35
2.00
1.50
1.50
Silicon
2.50
1.50
1.50
Sulfur
0.040
0.040
0.040
Phosphorus
0.040
0.040
0.040
Chromium
13.0
17.0
33.0
37.0
0.50
15.0
18.0
13.0
16.0
1.75
2.25
19.0
22.0
27.5
30.5
2.0
3.0
...
0.03
max
2.00
max
1.00
max
0.010
max
0.040
max
20.0
22.0
23.5
25.5
6.0
7.0
...
CF10SMnN
J92972
CK3MCuN
J93254
CE20N
J92802
CG3M
J92999
0.025
0.20
0.03
1.20
1.50
1.50
1.00
1.50
1.50
0.04
7.00
9.00
3.50
4.50
0.030
0.05
0.15
0.15
1.50
0.50
1.50
0.03
0.010
0.040
0.04
0.040
0.04
0.060
0.03
0.045
0.040
0.04
18.0
21.0
9.0
13.0
3.0
4.0
...
16.0
18.0
8.0
9.0
...
19.0
21.0
31.0
34.0
...
23.0
26.0
8.0
11.0
0.50
...
...
18.0
21.0
9.0
13.0
3.0
4.0
...
...
...
0.50
1.50
...
19.5
20.5
17.5
19.5
6.0
7.0
...
...
...
...
...
0.08
0.18
...
0.18
0.24
0.08
0.20
...
0.50
1.00
...
...
...
Bal
...
CG8M
J93000
1.50
CT15C
N08151
Molybdenum
Columbium
(niobium)
Vanadium
...
...
...
...
...
...
Nitrogen
...
...
...
0.18
0.26
0.10
0.30
20.50
23.50
11.50
13.50
1.50
3.00
0.10
0.30
0.10
0.30
0.20
0.40
Copper
...
...
...
...
...
...
...
...
0.75
max
...
...
Iron
3.0
4.0
...
...
...
...
...
...
Nickel
A
B
Grade CF8C shall have a columbium content of not less than 8 times the carbon content but not over 1.00 %.
Grade CF10MC shall have a columbium content of not less than 10 times the carbon content but not over 1.20 %.
A 351/A 351M 05
TABLE 3 Tensile Requirements
Tensile strength,
min, ksi [MPa]
Yield strength,A
min, ksi [MPa]
Elongation in
2 in. or
50 mm,B
min, %
Reduction of
area, min, %
CF3 CF3A CF8 CF8A CF3M

J92700 J92700 J92600 J92600 J92800
CFCF8M
CFCF8C
CF10 CF10M CH8
CH10
CH20
CK20
HK30
HK40
3MA J92900 3MN J92710 J92950 J92901 J93400 J93401 J93402 J94202 J94203 J94204
J92800
J92804
70
[485]
30
[205]
35.0
77
[530]
35
[240]
35.0
70
[485]
30
[205]
35.0
77
[530]
35
[240]
35.0
70
[485]
30
[205]
30.0
80
[550]
37
[255]
30.0
70
[485]
30
[205]
30.0
75
[515]
37
[255]
35.0
70
[485]
30
[205]
30.0
70
[485]
30
[205]
35.0
70
[485]
30
[205]
30.0
65
[450]
28
[195]
30.0
70
[485]
30
[205]
30.0
70
[485]
30
[205]
30.0
65
[450]
28
[195]
30.0
65
[450]
35
[240]
10.0
62
[425]
35
[240]
10.0
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
...
Tensile strength,
min, ksi [MPa]
Yield strength,A
min, ksi [MPa]
Elongation in
2 in. or
50 mm,B
min, %
Reduction of
area, min,%
A
B
HT30
N08030
CF10MC
CN7M
N08007
CN3MN
J94651
CE8MN
CG
6MMN
J93790
CG8M
J93000
CF10SMnN
J92972
65
[450]
28
[195]
15.0
70
[485]
30
[205]
20.0
62
[425]
25
[170]
35.0
80
[550]
38
[260]
35
95
[655]
65
[450]
25.0
85
[585]
42.5
[295]
30.0
75
[515]
35
[240]
25.0
85
[585]
42.5
[295]
30.0
...
...
...
...
...
...
...
...
CT15C
N08151
CK3MCuN
J93254
CE20N
J92802
CG3M
J92999
63
[435]
25
[170]
20.0
80
[550]
38
[260]
35
80
[550]
40
[275]
30.0
75
[515]
35
[240]
25
...
...
...
...
Determine by the 0.2 % offset method.

When ICI test bars are used in tensile testing as provided for in Specification A 703/A 703M, the gage length to reduced section diameter ratio shall be 4 to 1.
SUPPLEMENTARY REQUIREMENTS
The following supplementary requirements shall not apply unless specified in the purchase order. A
list of standardized supplementary requirements for use at the option of the purchaser is included in
Specification A 703/A 703M. Those which are ordinarily considered suitable for use with this
specification are given below. Others enumerated in Specification A 703/A 703M may be used with
this specification upon agreement between the manufacturer and purchaser.
S2. Destruction Tests
S11. Post Weld Heat Treatment
S5. Radiographic Inspection
S11.1 All austenitic castings, except Grades HK, HT, and

CT15C, which have been subjected to weld repairs, shall be
given a post-weld solution heat treatment.
S6. Liquid Penetrant Inspection

S10. Examination of Weld Preparation
S10.1 The method of performing the magnetic particle or
liquid penetrant test shall be in accordance with Practice E 165
or Practice E 709.
A 351/A 351M 05
SUMMARY OF CHANGES
Committee A01 has identified the location of selected changes to this standard since the last issue (A 351/
A 351M 03) that may impact the use of this standard (Approved May 1, 2005).
(1) Removed CD4MCu and CD3MWCuN and reference to
duplex stainless steel grades from the title and text. See
Specification A 995/A 995M.
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of infringement of such rights, are entirely their own responsibility.
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if not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standards
and should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of the
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make your views known to the ASTM Committee on Standards, at the address shown below.
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Designation: A 351/A 351M 05

Standard Specification for

Castings, Austenitic, for Pressure-Containing Parts1

1.2 A number of grades of austenitic steel castings are

3. General Conditions for Delivery

*A Summary of Changes section appears at the end of this standard.

10. Repair by Welding

NOTE 3When austenitic steel castings are to be used in services

NOTE 2Proper heat treatment of these alloys is usually necessary to

TABLE 1 Heat-Treatment Requirements

Grade shall be quenched in water or the castings may be furnace cooled to

CF3 CF3A CF8 CF8A CF3M

Determine by the 0.2 % offset method.

S11. Post Weld Heat Treatment

S5. Radiographic Inspection

S11.1 All austenitic castings, except Grades HK, HT, and

S6. Liquid Penetrant Inspection

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