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Problems solved by technology
In the case of manufacturing a steel sheet having a high strength of 800 MPa or more in an actual process, the cold rolling characteristics are significantly lowered due to the high strength of the hot strip as an intermediate material
In addition, since the heat treatment conditions of rapid cooling should be used in the annealing process, the workability is also significantly reduced
Japanese Patent Laid-Open No. 2005105367 does not fully consider these issues
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[0015] A steel plate comprising: 0.02%-0.20% C; 1.5% or less Si; 1.5%-3.0% Mn; 0.001%-0.10% P; 0.010% or less S; %-0.40% of acid-soluble aluminum (Sol.Al); 0.020% or less of N; 0.3%-1.5% of Cr; 0.0010%-0.0060% of B; 0.001%-0.10% of Sb; At least one material selected from the group consisting of 0.003%-0.08% of Ti, 0.003%-0.08% of Nb, and 0.003%-0.08% of Mo; including iron and other unavoidable impurities as a balance, and Si, Mn, B, Sb, P and S satisfy the conditions of 5<(Si / Mn+150B) / Sb<20 and C+Mn / 20+Si / 30+2P+4S<0.27.
[0016] In addition, a method for manufacturing the steel plate includes: heating a slab of the steel plate, and 3 Rolling and coiling a slab at a temperature between the transition point and the finish rolling exit side of 950° C., the slab of the steel plate comprising 0.02% to 0.20% of C, 1.5% or less of Si, 1.5% by weight percentage %-3.0% Mn, 0.001%-0.10% P, 0.010% or less S, 0.01%-0.40% acid-soluble aluminum (Sol.Al), 0.020% or less N, 0.3%-1.5 % Cr, ...
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Abstract
Provided are a high strength thin steel sheet having tensile strength of about 800 MPa or more, and a manufacturing method thereof. The thin steel sheet is mainly used for construction materials, home appliances, and automobiles. The thin steel sheet has excellent plating characteristic, welding characteristic, bending workability, and hole expansion ratio. The thin steel sheet includes, in weight %, C: 0.02-0.20%, Si: 1.5% or less, Mn: 1.5-3.0%, P: 0.001-0.10%, S: 0.010% or less, SoLAl: 0.01-0.40%, N: 0.020% or less, Cr: 0.3-1.5%, B: 0.0010-0.0060%, Sb: 0.001-0.10%, and including at least one material selected from the group consisting of Ti: 0.003-0.08%, Nb: 0.003-0.08%, and Mo: 0.003-0.08%, and includes Fe and other inevitable impurities as a remainder. Here, Si, Mn, B, Sb, P, and S meet conditions of 5<(Si / Mn+150B) / Sb<20 and C+Mn / 20+Si / 30+2P+4S<0.27. Also, the manufacturing method can secure workability of the thin steel sheet.
Description
[0001] This application is a branch of a PCT patent application with a priority date of December 28, 2007 and an application number of 200880123092.5 filed on August 8, 2008, entitled "High-strength thin steel plate with excellent weldability and its production process". case application. technical field [0002] The present invention relates to a high-strength thin steel sheet having a tensile strength of about 800 MPa or more, which is mainly used for building materials, home appliances, and automobiles, and a manufacturing method thereof, and more particularly, to a steel sheet having excellent plating characteristics. , weldability, bending workability, hole expansion ratio (HER), and high tensile strength high-strength thin steel plate and a manufacturing method thereof. Background technique [0003] Recently, steel sheets for automobiles are required to have higher strength in order to improve fuel economy or durability. In consideration of collision safety and passen...
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