A Study on Weld Cracking of High Ni 13Cr Cast Steels

Weldability of 13 Cr Cast Steels (2)

Abstract

The effects of Ni contents in 13 Cr cast steel and coated electrode with 2-6 % of Ni added for improvement of weldability on the crack sensitivity were investigated using the slit type cracking test specimens. The results of these test are sununerized as follows.
(1) Crack sensitivity of the HAZ remarkably decreases when Ni contents of base metal is increased from 2% to 6%.
(2) In case of no preheating, weld cracks could be perfectly prevented when 13 Cr-Ni base metal with Ni added by 6 % and 13 Cr type electrode (containing Ni 2.5-4 %) were used.
(3) In the 13 Cr-Ni cast steel containing Ni 4 %, weld cracking was not observed when the preheating temperature was above 100°C and 13 Cr type electrode (containing Ni 2.5-4 %) was used.