Analysis of Elements Responsible for Hydrogen Induced Cracking（HIC）of Steel for Linepipe

Studied is the negative influence on HIC performance of the steel for linepipe by the chemical composition and metallographic structure thereof, resu lting in the conclusion that the banded structure and martensite content signifi cantly affect the HIC performance of the steel, while the Scontent and Cep also have their certain influences on the said performance respectively. Steel conta ining small amount Cu and Ni is more suitable for service in the acidic environm ent.