The method for producing the same hydraulic pressure and high tensile steel and iron

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PROBLEM TO BE SOLVED : To provide a high tensile strength steel material for a hydraulic pressure iron pipe having excellent weld zone toughness, further free from the generation of weld cracking even if welding is performed in a preheating-free state under a high temperature-high humidity environment, and is further friendly to natural environment. ŽSOLUTION : The high tensile strength steel material for the hydraulic pressure iron pipe has a chemical composition containing 0.04 to 0.09% C, 0.05 to 0.6% Si, 1.0 to 1.8% Mn, ≤0.02% P, ≤0.01% S, COPYRIGHT : (C)2010, JPO&INPIT Ž