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由中国石油物资上海公司和上海盛桥轧辊厂合作生产的钻具转换接头毛坯,采用宝钢提供的40CrNiMo或36CrNiMo4钢,其化学成分、机械性能及金相组织均优于其它合金钢,产品韧性好。
The raw material of the tool joint for conversion made by SINOPEC Shanghai Company and Shanghai Shengqiao Roller Mill is 40CrNiMo or 36CrNiMo4 steel provided by Baosteel. Its chemical composition, mechanical properties and microstructure are better than those of other alloy steel. The toughness of the product is good .