High strength cold-rolled steel plate with low yield strength and preparation method thereof
A technology of high-strength steel plate and low yield strength, applied in the field of low-yield strength cold-rolled high-strength steel plate and its preparation, can solve the problems of affecting welding performance, difficulty of steelmaking production and cost increase, etc., to improve comprehensive performance and production cost Low, easy to promote the effect
Active Publication Date: 2016-09-14
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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Problems solved by technology
The cold-rolled carbon structural steel produced by this method meets the requirements of mechanical properties, but the high content of C and Mn affects its welding performance, and the need to accurately control the content of N increases the difficulty and cost of steelmaking production
Method used
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Embodiment 1～4
[0063] The low-yield strength cold-rolled high-strength steel plate provided by the invention has a preparation method as follows:
[0064] (1) Through the smelting process, the cold-rolled high-strength steel plate slab of the chemical composition shown in Table 1 has been prepared:
[0065] Table 1 Chemical composition of cold-rolled high-strength steel sheets (wt.%)
[0066] Example
[0067] (2) After heating, dephosphorization, hot rolling and laminar cooling to obtain hot rolled coils, the heating temperature is 1220-1260°C, the starting temperature of finish rolling is 1000-1100°C, and the finishing rolling temperature is 880-940°C °C, the coiling temperature is 640-700 °C; the specific hot-rolling process parameters are shown in Table 2 below:
[0068] Table 2 Main process parameters of high-strength steel hot rolling
[0069] Example
[0070] (3) After the hot-rolled coils are pickled, they are cold-rolled into thin steel strips, wherein the cold-...
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The invention relates to a high strength cold-rolled steel plate with a low yield strength and a preparation method thereof, and belongs to the technical field of high strength cold-rolled steel for automobiles. The provided steel plate is mainly composed of ferrite and bainite, the yield strength is 230 to 260 MPa, the tensile strength is 400 to 440 MPa, and the elongation rate is 40.0 to 43.0%. The steel plate is prepared by the following steps: smelting a steel plate slab, subjecting the casted slab to heating, scale removing, coarse rolling, finishing rolling and laminar cooling to obtain a hot-rolled roll, subjecting the hot-rolled roll to acid washing, carrying out cold rolling to obtain a cold-rolled thin steel belt, and subjecting the cold-rolled thin steel belt to continuous annealing to obtain a high strength cold-rolled steel plate. The cold-rolled steel plate has good comprehensive properties, has the advantages of excellent moulding property, low yield strength, low yield ratio, and long elongation rate, and contains little C, Si, and Mn, the welding performance is excellent, moreover, the preparation method is simple, the production cost is low, and the popularization is easy.
Description
technical field [0001] The invention relates to a cold-rolled high-strength steel plate with low yield strength and a preparation method thereof, and belongs to the technical field of cold-rolled high-strength steel for automobiles. Background technique [0002] With the development of automobile lightweight technology, it has become an inevitable trend for automobile steel to develop towards high-strength steel. High-strength steel such as dual-phase steel has the characteristics of low yield strength, high tensile strength and excellent plasticity, and has become the preferred high-strength steel for automobiles. Its consumption is expected to exceed 70% of advanced high-strength steel for automobiles. With the continuous release of domestic auto sheet production capacity, the competition in the high-strength steel market has become increasingly fierce. Low-cost, high-performance high-strength steel has become the goal pursued by various companies and has attracted great a...
Claims
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Patent Timeline
Login to View More IPC IPC(8): C22C38/02C22C38/04C22C38/06C21D8/02C21D1/26
CPCC21D8/0226C21D8/0236C21D8/0273C21D2211/002C21D2211/005C22C38/001C22C38/02C22C38/04C22C38/06
Inventor 郑之旺邝春福徐权左军张功庭王敏莉余灿生于秀
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP