S9074-AR-GIB-010/278
Table VI-Post Heat Requirements for Welded ferrous alloys - Continued
Applicable supplementary provisions and exceptions
Pressure vessels, turbines classes A-F, A-LT, A-1, A-2, A-3, A- 4, T-1, and T-2 Thermal stress relief is required. No exceptions. All attachments or parts welded thereto shall be stressed relieved.
Holding Tempera ture *F 2/, 3/
Material Group Number
Material Identifica tion 1/ High alloy steel martensiti c
Machinery class M 1/
Piping Class P
1250- 1400
Thermal stress relief mandatory should S-6 materials be used to fabricate class M machinery parts.
Thermal stress relief is required for welds in all sizes of piping.
S-6
9/ 1100- 1150 10/ 1st 1225- 1275 2nd 1100- 1150
8/ 1100- 1150
High alloy steel martensiti c
Thermal stress relief mandatory should S-6A materials be used to fabricate class M machinery parts.
Thermal stress relief is required. No exceptions. All attachments or parts welded thereto shall be stressed relieved.
Thermal stress relief is required for welds in all sizes of piping.
S-6A
1350- 1425
High alloy steel ferritic
Thermal stress relief mandatory should S-7 materials be used to fabricate class M machinery parts.
Thermal stress relief is required. No exceptions. All attachments or parts welded thereto shall be stressed relieved.
Thermal stress relief is required for welds in all sizes of piping.
S-7
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