STEEL MATERIAL EXHIBITING SUPERIOR HYDROGEN CRACKING RESISTANCE IN A WET SOUR GAS ENVIRONMENT

摘要

Described is the steel material obtained from large steel ingots or slabs more than 20 tons in weight and through hot rolling process. The material contains less than 0.08% of carbon with residual carbon ranging between 0.005 and 0.03%, 0.01 to 0.50% of , 0.8 to 2.5% of manganese, less than 0.025% of phosphorous, less than 0.004% of sulphur and 0.005 to 0.1% of aluminium with one or more of niobium, titanium and vanadium in amounts less than 0.12% for niobium and less than 0.15% for titanium and vanadium, the balance being iron and unavoidable impurities. The steel exhibits a superior hydrogen cracking behavior under a hydrogen sulfide environment.