A kind of low-alloy high-strength steel q420c steel plate and production method thereof
A production method and technology for high-strength steel, which are applied in metal rolling, process efficiency improvement, temperature control, etc., can solve problems such as increasing alloy cost, and achieve the effects of low production cost, uniform and fine grains, and satisfactory mechanical properties.
Active Publication Date: 2022-05-17
TIANJIN IRON & STEEL GRP
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Problems solved by technology
In the composition design of the steel plate in this prior art, high manganese content Mn: 1.45%-1.55% will increase the cost of the alloy, the double refining of LF refining and RH refining, and the use of electromagnetic stirring in the continuous casting process will increase the production cost of the process
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[0016] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0017] A low-alloy high-strength steel Q420C steel plate contains the following chemical components in mass percentages, in wt%: C: 0.16-0.20, Si: 0.15-0.30, Mn: 0.70-0.90, P: <0.020, S: <0.012, Ti :0.055~0.065, Als:0.010-0.03, others are Fe and residual elements;
[0018] The present invention also provides a production method based on reducing the production cost of the above-mentioned low-alloy high-strength steel Q420C steel plate, which sequentially includes converter smelting, LF refining, slab continuous casting, slab heating, high-pressure water descaling, rough rolling, finish rolling, layer Flow cooling, hot stra...
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Abstract
The invention discloses a low-alloy high-strength steel Q420C steel plate. The steel plate contains the following chemical components in mass percent, and the unit is wt%: C: 0.16-0.20, Si: 0.15-0.30, Mn: 0.70-0.90, P: <0.020 . The production method of Q420C steel plate adopts reasonable composition design, adopts low Mn-high Ti micro-alloy composition system, does not reduce toughness under the premise of ensuring strength, adopts clean molten steel, optimized temperature-controlled rolling and ACC controlled cooling process to obtain ideal F +P structure, uniform and fine grains, mechanical properties can meet the requirements of GB / T 1591-2018, and the production cost is lower than other steel companies that can produce Q420C, which has a strong competitive advantage.
Description
technical field [0001] The invention belongs to the technical field of low-alloy high-strength steel production, and in particular relates to a low-alloy high-strength steel Q420C steel plate and a production method for reducing the production cost of the low-alloy high-strength steel Q420C steel plate. Background technique [0002] Low-alloy high-strength steel plate Q420C is widely used in the fields of construction machinery and plant structural parts. The national standard requires that the impact energy of the steel plate is greater than 34J at 0°C, and the steel plate needs to have good toughness while having high strength. The room temperature and low temperature structure of Q420C steel plate is generally ferrite + pearlite, and a certain amount of microalloys such as Nb, V, Ti are added on the basis of C-Mn to ensure the matching of strength and toughness; The cooling rate and very low final cooling temperature fully refine the ferrite grains to improve the strengt...
Claims
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IPC IPC(8): C22C38/02C22C38/04C22C38/14C22C38/06C22C33/06C21D8/02B21B37/74B21B1/46
CPCC22C38/02C22C38/04C22C38/14C22C38/06C22C33/06C21D8/0205C21D8/0226B21B37/74B21B1/463C21D2211/005C21D2211/009Y02P10/20
Inventor 刘伟俞飞王晓晶闫文凯王佩鑫孙福来张恭
Owner TIANJIN IRON & STEEL GRP