采用多元微合金化成分设计，通过LF+VD精炼、连铸、TMCP控轧控冷、正火等一系列技术，成功开发出高强高韧性的XG D36-Z35深海石油钻井平台用特厚钢板(80～100 mm)。试生产结果表明：特厚板内部质量和各项综合性能指标均能满足用户的要求。其中探伤合格率达到99.8%，不同厚度的最小屈服强度和抗拉强度分别超过365 和515 MPa，最小伸长率为30.5%；z向断面收缩率最小值为39.2%；-20 ℃横向1/4和1/2冲击功最小值分别为79和81 J。
A high strength and toughness deep-sea oil drilling platform structure steel XG D36-Z35 (80～100 mm)was developed by a series of advanced technologies such as multi-micro alloy compound design, LF+VD refining, casting, TMCP rolling and normalizing heat treatment. The results show the steel has good metallurgical quality, high mechanical properties, which can meet the requirements of consumers. The qualified ratio of ultrasonic flaw detection attained 99.8%, the yield strength and tensile strength were more than 365 and 515 MPa respectively, and extensibility was more than 30.5%; Moreover, thickness directional section shrinkage also was more than 39.2%; and under -20 ℃, the 1/4 and 1/2 impact energy on different positions was more than 79 and 81 J respectively.
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