STEEL PLATE WITH HIGH SOHIC RESISTANCE AT THE H2S CONTAINING ENVIRONMENT

摘要

A steel material having high SOHIC resistance is provided to make a line pipe having a large diameter over 36 inch at crude oil and gas environment including hydrogen sulfide. A steel material having high SOHIC resistance includes 0.02~0.15wt.% of carbon, 0.1~0.4wt.% of silicon, 0.5~1.8wt.% of manganese, 0.001~0.1wt.% of aluminum, 0.015wt.% and below of phosphorus; 0.005wt.% and below of sulfur, 0.05~0.3wt.% of copper, 0.05~0.6wt.% of nickel, 5~50ppm of calcium, residual iron and inevitable impurities.