AWS B2.1-4-218:1999 (R2009)
Standard Welding Procedure Specification (SWPS) forShielded Metal Arc Welding of Chromium-Molybdenum Steel (M-4/P-4, Group 1 or 2),E8018-B2, 1/8 through 1/2 in. Thick, As-Welded Condition; 1/8 through 1-1/2 in. Thick,PWHT Condition, Primarily Pipe Applications
standard by American Welding Society, 12/08/1999