Stress Corrosion Cracking of A515Grade 60Carbon Steel.

摘要

An investigation was conducted to evaluate the effect of welding method plate thickness,and subsequent stress relief treatment on the stress corrosion cracking propensity of ASTM A515Grade 60carbon steel plate exposed to a 5 M NaNO sub 3solution at 190exp 0 F for eight weeks. It was found that all weld coupons receiving no thermal stress relief treatment cracked within eight weeks;all weld coupons given a vibratory stress relief cracked within eight weeks;two of the eight weld coupons stress relieved at 600exp 0 F for one hour cracked within eight weeks;none of the weld coupons stress relieved at 1100exp 0 F for one hour cracked within eight weeks;and that cracking was generally more severe in coupons fabricated from 7/8inch plate by shielded metal arc welding than it was in coupons fabricated by other welding methods.