S9074-AR-GIB-010/278
6.2.5 Selection of filler materials. Filler materials shall be selected for compatibility with the base material on the basis of chemical composition, mechanical properties, post weld heat treatment requirements, and component/system operating conditions and requirements. Tables II and III identify specifications in which guidelines may be found to assist in selecting compatible filler materials for more commonly used base materials. 6.2.5.1 Filler materials for steam service applications. 6.2.5.1.1 Ferritic and martensitic steel filled metals for the base materials commonly used in steam service applications shall be as follows: Base material S-group No. Filler metal A-group no. For S-1 materials - A-2A, A-2, A-2D, A-1B, and A-1A (MIL-7010-A1 only as noted in 6.2.3) For S-3 materials - A-2A (MIL-7010-A1, 7011-A1, 7018-A1, and 7020-A1 only) For S-3A materials - A-3A, A-3B, A-3C For S-4 materials - A-6A (80XX-B2 and -B2L only) For S-5 materials - A-6A (90XX-B3 and -B3L only) A-6B (MIL-521, ER90S-B3 and -B3L only) A-6C (F9PX-EB3-B3H8 only) For S-6 and S-7 materials - A-7A-2 or A-7B-2 For S-6A materials - A-7A-2 (MIL-410-NiMo-XX only), A-7B-2 6.2.5.1.2 For welding of different combinations of the base materials as specified in 6.2.5.1.1 the welding filler material shall be specified for either of the base materials involved except for covered electrodes, only the low hydrogen types XX-15, XX-16, and XX-18 shall be used with S-3A, S-4, S-5, S-6 and S-7 base materials. 6.2.5.13 For joining base materials under groups S-1, S-3, S-3A. S-4, S-5, S-6 and S-7 to base materials under group S-8, the following filler metals shall be used:
Nickel base alloys A-43A (MIL-8N12 only) A-43B (MIL-82, EN82, and RN82 only) High alloy steel (austenitic) A-8A (MIL-309-XX, MIL-309L-XX, MIL-309Cb-XX, and MIL-310-XX only) A-8B (MIL-309, MIL-310, and ER309L only)
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