摘要:
较高碳含量钢种的低韧性和低的可焊性制约了它们在管线钢中应用,因此,建立起了低碳微合金化钢用于陆上和海上管线钢的良好需求。对于低碳微合金钢,在最小工艺和合金成本条件下获得所需的力学性能,合金设计起着重要作用。在合金设计过程中,虽然主要焦点是考虑从板坯再加热到最终轧制的热轧工艺,但是为保证钢的洁净度,也不能忽视炼钢和连铸过程,为此给出了合金设计和热轧参数的详细研究,以获得最佳的力学性能,包括在-25℃进行落锤撕裂试验获得较高的韧性。试验钢采用API 5L X70M PSL2的板坯,轧制成尺寸为25 mm×3 830 mm钢板。并将力学测试结果与显微组织分析和热轧参数相互关联。
Abstract:
The low toughness and poor weldability of the higher carbon steel grades restricted their acceptability for line pipe steel,and therefore,created good demand of low carbon micro-alloyed steels for line pipe steel for both onshore and offshore applications.In low carbon micro-alloyed steels,alloy design plays an important role to achieve the desired mechanical properties with minimum processing and alloy cost.During the alloy design process,though primary focus is given to the hot rolling process starting from slab re-heating to final rolling,but steelmaking and continuous casting cannot be overlooked for cleanliness of the steel.This paper presents a detailed study of alloy design and hot rolling parameters to achieve the optimum mechanical properties including higher toughness measured by drop weight tear test at -25℃.These experiments were carried out with API 5L X70M PSL2 grade slabs,which were rolled into plates of size 25 mm x 3 830 mm.The test results were co-related with microstructure analysis and hot rolling parameters.
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