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Continuous cast slab having no surface crack and method for producing non-tempered high strength steel using this slab
Continuous cast slab having no surface crack and method for producing non-tempered high strength steel using this slab
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机译：没有表面裂纹的连铸板坯以及使用该板坯生产非回火高强度钢的方法
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摘要
N-V(nitrogen-vanadium) containing continuous casting slab with no surface cracks suitable for the manufacture of non-tempered high tensile steel materials has a tensile strength of 490 MPa or more and excellent toughness. A method of manufacturing non-tempered high tensile steel materials uses the casting slab as the raw material. Compatibility between the desired properties of the materials utilizing VN and inhibition of the surface cracks of test pieces, can be attained by controlling the steel composition and the relationship between each of components of the steel thereby controlling precipitation of VN and MnS. A continuous casting slab with no surface cracks contains C, Si, Mn, P, S, Al, V, N, Ti, B, Ca and REM each within a specified range, and satisfies an equation for the relationship between V and N and a relationship between Mn and S.
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