A kind of hot-rolled steel plate for cold forming and its manufacturing method
A technology for a hot-rolled steel sheet and a manufacturing method, which is applied to the high-strength hot-rolled steel sheet for cold forming with a yield strength of 750 MPa and the field of its preparation, can solve the problems of difficult production process and high production cost, and achieves reduced production cost and strong adaptability. , Simple effect of rolling process control
Inactive Publication Date: 2016-07-20
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP +1
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Problems solved by technology
[0006] The purpose of the present invention is to provide a new high-strength steel plate for cold forming with a yield strength of 750 MPa in order to overcome the defects of high production cost and difficult production process of high-strength hot-rolled steel sheets with a yield strength of 750 MPa for cold forming in the prior art. Hot-rolled steel sheet and manufacturing method thereof
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Embodiment 1-5
[0029] After the steelmaking step (see Table 1 for the composition of the molten steel after steelmaking), the molten steel is cast in an integral argon gas seal, and the molten steel is injected into the tundish through the sliding nozzle at the bottom of the ladle. The temperature of the tundish is 1538°C. The casting speed of the slab is 0.7m / min, and the thickness of the continuous casting slab is 200mm~230mm; the continuous casting slab is heated in the heating furnace, and the heated slab is dephosphorized by high-pressure water to remove the oxide scale formed on the surface, and then enters the In the reversible rough rolling unit, the intermediate billet after rough rolling enters the hot coil box, the strip head and tail are exchanged, and then the finish rolling is carried out. After the finish rolling, laminar cooling and coiling are carried out to obtain hot-rolled steel plates. Among them, The temperature of slab heating, the exit temperature of rough rolling, the...
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Abstract
The invention discloses a hot-rolled steel plate for cold forming and a manufacturing method thereof. The preparation method of the hot-rolled steel plate for cold forming includes a steelmaking step, a continuous casting step, a heating step, a hot continuous rolling step and a coiling step. That is, the composition of the molten steel after steelmaking is: 0.05-0.1% by weight of C, ≤0.1% by weight of Si, 1.7-1.95% by weight of Mn, 0.03-0.07% by weight of Nb, and 0.09-0.14% by weight of Ti , 0.1-0.3% by weight of Mo, ≤0.025% by weight of P, ≤0.01% by weight of S, the balance being Fe and unavoidable impurities; the finishing rolling temperature in the hot continuous rolling step is 850-900 °C; the coiling temperature in the coiling step is 530-580 °C. According to the method of the present invention, a high-strength hot-rolled steel sheet for cold forming with a yield strength of 750 MPa can be provided.
Description
technical field [0001] The invention relates to a hot-rolled steel plate for cold forming and a manufacturing method thereof, in particular to a high-strength hot-rolled steel plate for cold forming with a yield strength of 750 MPa and a preparation method thereof. Background technique [0002] In order to avoid the influence of hot-forming process on the softening of hot-rolled steel plate material, in practical application, it is an economical and practical method to use cold-forming process to process cold-bent parts for hot-rolled steel plate with small thickness. Hot-rolled steel sheets for forming have been greatly developed, and hot-rolled steel sheets for cold forming are widely used in automobiles, engineering machinery, steel structures, construction and other fields. [0003] The yield strength of the hot-rolled steel plate first used in the cold forming process is within 400MPa. With the development of various industries, in order to reduce production costs and i...
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IPC IPC(8): C22C38/14C22C33/04C21D8/04
Inventor 张开华叶晓瑜翁建军邹小波刘勇罗许王海云任守斌
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP