S9074-AR-GIB-010/278
TABLE IV. Preheat and interpass temperature for welded ferrous alloys.
Material group number
Material identification
Minimum preheat temperature °F 1/ , 2/ , 3/
Maximum interpass temperature °F
Supplementary provisions for preheat and interpass temperature Where both carbon content in base metal is greater than 0.30 percent and thickness exceeds 1 inch.
Carbon Steel
175
-
S-1
60
-
For all other S-1 materials
Quenched and tempered carbon steel
60
300
Minimum preheat and interpass temperature for all thickness Where either the specified minimum tensile strength is greater than 70,000 lb/in ² or thickness is greater than 5/8 inch.
S-2
Carbon molybdenum
175
-
S-3
60
-
For all other S-3 materials
Manganese molybdenum and NiMnMo Chromium molybdenum steel Cr 3/4-2 percent
300
500
S-3A
For all thicknesses
250
-
Where either the specified minimum tensile strength is greater than 60,000 lb/in² or thickness is greater than 1/2 inch
S-4
60
-
For all other S-4 materials
Chromium molybdenum steel Cr > 2 percent
400
-
Where either the specified tensile strength is greater than 60,000 lb/in² or has both specified chromium content greater than 6.0 percent and thickness greater than 1/2 inch
S-5
300
-
For all other S-5 materials
See footnotes at end of table.
Original 55
Made with FlippingBook - Share PDF online