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一、结构用高强度钢材的发展 1.Si-Mn系50公斤级钢(屈服点32公斤/毫米~2以上) 1953年8月,由日本材料试验协会进行综合研究的结果,确定把可焊性良好的高强度钢作为桥梁结构用钢材。同年由有代表性的钢厂六家、大学、研究所,包括桥梁公司组成综合研究班以来,对桥梁用可焊性良好的,且容许应力较普通结构用轧制钢材SS41、SM41提高50％的高强度钢进行了研究。最初以德国研带4成的HSB 50(Hochfester Schweiβen-
First, the structure of the development of high strength steel 1.Si-Mn Department 50 kg of steel (yield point 32 kg / mm ~ 2 or more) August 1953 by the Japan Materials Testing Association conducted a comprehensive study of the results to determine the weld Good high-strength steel as a bridge structure steel. Since the same year, a representative steel mills, universities, research institutes, including bridge companies to form a comprehensive research class, the bridge with good weldability and allowable stress than the average structure of rolled steel SS41, SM41 increased by 50% High-strength steel was studied. At first, 40% of German HSB 50 (Hochfester Schweiβen-