ASTM A351-06

Designation: A 351/A 351M – 06 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. 1. Scope* 1.1 This specification2 covers austenitic steel castings for valves, flanges, fittings, and other pressure-containing parts (Note 1). NOTE 1—Carbon steel castings for pressure-containing parts are cov- ered by Specification A 216/A 216M, low-alloy steel castings by Speci- fication A 217/A 217M, and duplex stainless steel castings by Specifica- tion 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. Selec- tion will depend on design and service conditions, mechanical properties, and high-temperature or corrosion-resistant charac- teristics, or both. 1.2.1 Because of thermal instability, Grades CE20N, CF3A, CF3MA, and CF8A are not recommended for service at temperatures above 800°F [425°C]. 1.2.2 Because of embrittlement phases, Grade CD4MCu is not recommended for service at temperatures above 600°F [316°C]. 1.3 Supplementary requirements of an optional nature are provided for use at the option of the purchaser. The Supple- mentary requirements shall apply only when specified indi- vidually by the purchaser in the purchase order or contract. 1.4 This specification is expressed in both inch-pound units and in SI units; however, unless the purchase order or contract specifies the applicable M specification designation (SI units), the inch-pound units shall apply. 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 may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in noncon- formance with the standard. 2. Referenced Documents 2.1 ASTM Standards: 3 A 216/A 216M Specification for Steel Castings, Carbon, Suitable for Fusion Welding, for High-Temperature Ser- vice A 217/A 217M Specification for Steel Castings, Martensitic Stainless and Alloy, for Pressure-Containing Parts, Suit- able for High-Temperature Service A 488/A 488M Practice for Steel Castings, Welding, Quali- fications of Procedures and Personnel A 703/A 703M Specification for Steel Castings, General Requirements, for Pressure-Containing Parts A 985/A 985M Specification for Steel Investment Castings General Requirements, for Pressure-Containing Parts A 995/A 995M Specification for Castings, Austenitic- Ferritic (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) 3. General Conditions for Delivery 3.1 Other than investment castings – Material furnished to this specification shall conform to the requirements of Speci- fication A 703/A 703M, including any supplementary require- ments that are indicated in the purchase order. Failure to comply with the general requirements of Specification A 703/ 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 March 1, 2006. Published March 2006. Originally approved in 1952. Last previous edition approved in 2005 as A 351/A 351M – 05. 2 For ASME Boiler and Pressure Vessel Code applications, see related Specifi- cation 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 standard’s 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. 1 *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 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 pre- vail. 3.2 Investment Castings – Material furnished to this speci- fication shall conform to the requirements of Specification A 985/A 985M, including any supplementary requirements that are indicated in the purchase order. Failure to comply with the general requirements of Specification A 985/A 985M con- stitutes nonconformance with this specification. In case of conflict between the requirements of this specification and Specification A 985/A 985M, Specification A 985/A 985M shall prevail. 3.3 The post weld heat treatment requirements of Supple- mentary Requirement S11 may be specified when austenitic castings other than HK, HT, or CT15C are to be subjected to severe corrosive service. 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. 5. Process 5.1 The steel shall be made by the electric furnace process with or without separate refining such as argon-oxygen decar- burization (AOD). 6. Heat Treatment 6.1 All castings shall receive a heat treatment at the tem- perature specified in Table 1, followed by a quench in water or rapid cool by other means except as noted. NOTE 2—Proper 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. 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 require- ments as to tensile properties prescribed in Table 3. 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 discon- tinuities 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 impreg- nated to stop leaks. 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 stan- dards that are used to inspect the castings. NOTE 3—When 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. 11. Keywords 11.1 austenitic stainless steel; pressure containing parts; stainless steel; steel castings TABLE 1 Heat-Treatment Requirements Grade Temperature, min °F °C HK30, HK40, HT30, CT15C as-cast as-cast CF3, CF3A, CF8, CF8A, CF3M, CF3MA, CF8M, CF3MN, CG3M, CF10, CF10M, CG8M 1900 1040 CF10SMnN, CF8C, CF10MC 1950 1065 CN7M, CG6MMN, CE8MN 2050 1120 CK3MCuN, CN3MN, CH8, CH10, CH20, CK20 2100 1150 CE20NA 2225 1220 A Grade shall be quenched in water or the castings may be furnace cooled to 2050°F [1120°C] minimum, held for 15 min minimum and then quenched in water or rapidly cooled by other means. A 351/A 351M – 06 2 TABLE 2 Chemical Requirements NOTE—CD4MCu 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, ex- cept where range is given) CF3, CF3A J92700 CF8, CF8A J92600 CF3M, CF3MA J92800 CF8M J92900 CF3MN J92804 CF8C J92710 CF10 J92950 CF10M J92901 CH8 J93400 CH10 J93401 CH20 J93402 CK20 J94202 HK30 J94203 HK40 J94204 Carbon 0.03 0.08 0.03 0.08 0.03 0.08 0.04– 0.04– 0.08 0.04– 0.04– 0.04– 0.25– 0.35– 0.10 0.10 0.10 0.20 0.20 0.35 0.45 Manganese 1.50 1.50 1.50 1.50 1.50 1.50 1.50 1.50 1.50 1.50 1.50 1.50 1.50 1.50 Silicon 2.00 2.00 1.50 1.50 1.50 2.00 2.00 1.50 1.50 2.00 2.00 1.75 1.75 1.75 Sulfur 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 Phosphorus 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 Chromium 17.0– 18.0– 17.0– 18.0– 17.0– 18.0– 18.0– 18.0– 22.0– 22.0– 22.0– 23.0– 23.0– 23.0– 21.0 21.0 21.0 21.0 21.0 21.0 21.0 21.0 26.0 26.0 26.0 27.0 27.0 27.0 Nickel 8.0– 12.0 8.0– 11.0 9.0– 13.0 9.0– 12.0 9.0– 13.0 9.0– 12.0 8.0– 11.0 9.0– 12.0 12.0– 15.0 12.0– 15.0 12.0– 15.0 19.0– 22.0 19.0– 22.0 19.0– 22.0 Molybde- 0.50 0.50 2.0– 2.0– 2.0– 0.50 0.50 2.0– 0.50 0.50 0.50 0.50 0.50 0.50 num 3.0 3.0 3.0 3.0 Columbium . . . . . . . . . . . . . . . A . . . . . . . . . . . . . . . . . . . . . . . . (niobium) Vanadium . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Nitrogen . . . . . . . . . . . . 0.10– . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.20 Copper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Element, % (max, ex- cept where range is given) HT30 N08030 CF10MC CN7M N08007 CN3MN J94651 CE8MN CG- 6MMN J93790 CG8M J93000 CF10S- MnN J92972 CT15C N08151 CK- 3MCuN J93254 CE20N J92802 CG3M J92999 Carbon 0.25– 0.10 0.07 0.03 0.08 0.06 0.08 0.10 0.05– 0.025 0.20 0.03 0.35 max 0.15 Manganese 2.00 1.50 1.50 2.00 1.00 4.00– 1.50 7.00– 0.15– 1.20 1.50 1.50 max 6.00 9.00 1.50 Silicon 2.50 1.50 1.50 1.00 1.50 1.00 1.50 3.50– 0.50– 1.00 1.50 1.50 max 4.50 1.50 Sulfur 0.040 0.040 0.040 0.010 0.040 0.030 0.04 0.030 0.03 0.010 0.040 0.04 max Phosphorus 0.040 0.040 0.040 0.040 0.040 0.040 0.04 0.060 0.03 0.045 0.040 0.04 max Chromium 13.0– 15.0– 19.0– 20.0– 22.5– 20.50– 18.0– 16.0– 19.0– 19.5– 23.0– 18.0– 17.0 18.0 22.0 22.0 25.5 23.50 21.0 18.0 21.0 20.5 26.0 21.0 Nickel 33.0– 37.0 13.0– 16.0 27.5– 30.5 23.5– 25.5 8.0– 11.0 11.50– 13.50 9.0– 13.0 8.0– 9.0 31.0– 34.0 17.5– 19.5 8.0– 11.0 9.0– 13.0 Molybde- 0.50 1.75– 2.0– 6.0– 3.0– 1.50– 3.0– . . . . . . 6.0– 0.50 3.0– num 2.25 3.0 7.0 4.5 3.00 4.0 7.0 4.0 Columbium . . . B . . . . . . . . . 0.10– . . . . . . 0.50– . . . . . . . . . (niobium) 0.30 1.50 Vanadium . . . . . . . . . . . . . . . 0.10– . . . . . . . . . . . . . . . . . . 0.30 Nitrogen . . . . . . . . . 0.18– 0.10– 0.20– . . . 0.08– . . . 0.18– 0.08– . . . 0.26 0.30 0.40 0.18 0.24 0.20 Copper . . . . . . 3.0– 4.0 0.75 max . . . . . . . . . . . . . . . 0.50– 1.00 . . . . . . A Grade CF8C shall have a columbium content of not less than 8 times the carbon content but not over 1.00 %. B 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 – 06 3 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 S5. Radiographic Inspection 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. S11. Post Weld Heat Treatment 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. TABLE 3 Tensile Requirements CF3 J92700 CF3A J92700 CF8 J92600 CF8A J92600 CF3M J92800 CF- 3MA J92800 CF8M J92900 CF- 3MN J92804 CF8C J92710 CF10 J92950 CF10M J92901 CH8 J93400 CH10 J93401 CH20 J93402 CK20 J94202 HK30 J94203 HK40 J94204 Tensile strength, 70 77 70 77 70 80 70 75 70 70 70 65 70 70 65 65 62 min, ksi [MPa] [485] [530] [485] [530] [485] [550] [485] [515] [485] [485] [485] [450] [485] [485] [450] [450] [425] Yield strength,A 30 35 30 35 30 37 30 37 30 30 30 28 30 30 28 35 35 min, ksi [MPa] [205] [240] [205] [240] [205] [255] [205] [255] [205] [205] [205] [195] [205] [205] [195] [240] [240] Elongation in 2 in. or 50 mm,B min, % 35.0 35.0 35.0 35.0 30.0 30.0 30.0 35.0 30.0 35.0 30.0 30.0 30.0 30.0 30.0 10.0 10.0 HT30 N08030 CF- 10MC CN7M N08007 CN- 3MN J94651 CE- 8MN CG 6MMN J93790 CG8M J93000 CF10S- MnN J92972 CT15C N08151 CK- 3MCuN J93254 CE20N J92802 CG3M J92999 Tensile strength, 65 70 62 80 95 85 75 85 63 80 80 75 min, ksi [MPa] [450] [485] [425] [550] [655] [585] [515] [585] [435] [550] [550] [515] Yield strength,A 28 30 25 38 65 42.5 35 42.5 25 38 40 35 min, ksi [MPa] [195] [205] [170] [260] [450] [295] [240] [295] [170] [260] [275] [240] Elongation in 2 in. or 50 mm,B min, % 15.0 20.0 35.0 35 25.0 30.0 25.0 30.0 20.0 35 30.0 25 A Determine by the 0.2 % offset method. B When ICI test bars are used in tensile testing as provided for in Specification A 985/A 985M, the gage length to reduced section diameter ratio shall be 4 to 1. A 351/A 351M – 06 4 - - ` , ` ` , ` , ` , , , ` ` ` , , ` , ` ` ` ` ` ` , , ` , ` - ` - ` , , ` , , ` , ` , , ` - - - SUMMARY OF CHANGES Committee A01 has identified the location of selected changes to this standard since the last issue (A 351/A 351M – 05) that may impact the use of this standard. (Approved March 1, 2006) (1) Revised Scope wording to meet the guidelines of A01 Form and Style Manual and A01 Template for developing product specifications. (2) Revised Reference Documents – added A 985/A 985M for investment castings. (3) Revised General Conditions for Delivery to add the requirements for investment castings. (4) Deleted Fe from Table 2. Fe comprises the balance for all alloys in this specification. (5) Revised Table 3 reference to ICI test bars from A 703/ A 703M to A 985/A 985M for investment castings. (6) Deleted Reduction of Area from Table 3. There are no alloys with RA requirements. 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. ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years and if not revised, either reapproved or withdrawn. 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A 351/A 351M – 06 5 - - ` , ` ` , ` , ` , , , ` ` ` , , ` , ` ` ` ` ` ` , , ` , ` - ` - ` , , ` , , ` , ` , , ` - - - Scope Referenced Documents General Conditions for Delivery Ordering Information Process Heat Treatment Chemical Composition Tensile Properties Quality Repair by Welding Keywords TABLE 1 TABLE 2 TABLE 3