Designation A 297 A 297M 97 Reapproved 2003 Standard Specifi cation for Steel Castings Iron Chromium and Iron Chromium Nickel Heat Resistant for General Application1 This standard is issued under the fi xed designationA297 A297M 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 1 1 This specifi cation covers iron chromium and iron chromium nickel alloy castings for heat resistant service The grades covered by this specifi cation are general purpose alloys and no attempt has been made to include heat resisting alloys used for special production application NOTE1 For heat resisting alloys used for special product application reference should be made to Specifi cationA 351 A 351M A 217 A 217M and A 447 A 447M 1 2 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 specifi cation 2 Referenced Documents 2 1 ASTM Standards A 217 A 217M Specifi cation for Steel Castings Martensitic Stainless and Alloy for Pressure Containing Parts Suit able for High Temperature Service2 A 351 A 351M Specifi cation for Castings Austenitic Aus tenitic Ferritic Duplex for Pressure Containing Parts2 A 370 Test Methods and Defi nitions for Mechanical Testing of Steel Products3 A 447 A 447M Specifi cationforSteelCastings Chromium Nickel Iron Alloy 25 12 Class for High Temperature Service2 A 781 A 781M Specifi cation for Castings Steel and Alloy Common Requirements for General Industrial Use2 3 General Conditions for Delivery 3 1 Material furnished to this specifi cation shall conform to the requirements of Specifi cation A 781 A 781M including any supplementary requirements that are indicated in the purchase order Failure to comply with the general require ments of Specifi cation A 781 A 781M constitutes nonconfor mance with this specifi cation In case of confl ict between the requirements of this specifi cation and Specifi cation A 781 A 781M this specifi cation shall prevail 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 specifi cation and 4 1 4 The supplementary requirements desired including the standards of acceptance 5 Process 5 1 Alloys shall be made by the following processes electric arc electric induction or other approved processes 6 Heat Treatment 6 1 Castings for heat resistant service may be shipped in the as cast condition without heat treatment If heat treatment is required the treatment shall be established by mutual agree ment between the manufacturer and the purchaser and shall be so specifi ed in the inquiry contract or order 7 Chemical Composition 7 1 Alloys shall conform to the requirements as to chemical composition prescribed in Table 1 8 Repair by Welding 8 1 The composition of the deposited weld metal shall be similar to the composition of the casting All weld repairs shall be subjected to the same inspection standards as the casting 1 This specifi cation 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 April 10 2003 Published April 2003 Originally approved in 1946 Last previous edition approved in 1998 as A 297 A 297M 97 1998 2Annual Book of ASTM Standards Vol 01 02 3Annual Book of ASTM Standards Vol 01 03 1 Copyright ASTM International 100 Barr Harbor Drive PO Box C700 West Conshohocken PA 19428 2959 United States 8 2 Castings with major weld repairs shall be heat treated in accordance with Section 6 8 3 Weld repairs shall be considered major when the depth of the cavity after preparation for repair exceeds 20 of the actual wall thickness or 1 in 25 mm whichever is smaller or when the extent of the cavity exceeds approximately 10 in 2 65 cm 2 8 3 1 When Supplementary Requirement S7 is specifi ed on the purchase order or inquiry major weld repairs shall be subject to the prior approval of the purchaser 8 4 All other weld repairs shall be considered minor and may be made at the discretion of the manufacturer without prior approval of the purchaser SUPPLEMENTARY REQUIREMENTS The following supplementary requirements shall not apply unless specifi ed in the purchase order A list of standardized supplementary requirements for use at the option of the purchaser is included in Specifi cation A 781 A 781M Those which are ordinarily consi