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A high-elongation hot-rolled structure control steel with tensile strength ≥ 1200mpa and production method

A technology of tensile strength and high elongation, applied in heat treatment process control, heat treatment equipment, manufacturing tools, etc., can solve problems such as inability to meet demand, and achieve the effect of reducing alloy costs

Active Publication Date: 2021-06-15
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The thickness of this invention is only 1.0-3.0mm, which cannot meet the requirements of 7-12mm thick steel for commercial vehicle axles, saddles and other parts

Method used

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  • A high-elongation hot-rolled structure control steel with tensile strength ≥ 1200mpa and production method
  • A high-elongation hot-rolled structure control steel with tensile strength ≥ 1200mpa and production method
  • A high-elongation hot-rolled structure control steel with tensile strength ≥ 1200mpa and production method

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Embodiment Construction

[0047] The present invention is described in detail below:

[0048] Table 1 is the value list of the chemical components of each embodiment of the present invention and comparative examples;

[0049] Table 2 is the main process parameter list of each embodiment of the present invention and comparative example;

[0050] Table 3 is a list of the performance tests of the various embodiments of the present invention and comparative examples.

[0051] Each embodiment of the present invention is produced according to the following steps:

[0052] 1) RH vacuum furnace treatment is carried out after converter smelting, and the RH treatment time is not less than 15 minutes, and then the molten steel is continuously cast into billets and electromagnetically stirred during the continuous casting process;

[0053] 2) Heating the slab, the heating temperature is controlled at 1200-1240°C, and the heating time is 50-70min;

[0054] 3) Carry out segmental rolling, during which, the finish...

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Abstract

A high-elongation hot-rolled structure control steel with a tensile strength ≥ 1200MPa, the composition and weight percentage of which are: C: 0.19-0.21%, Mn: 1.60-1.80%, Si: 0.60-0.70%, P≤0.008 %, S≤0.002%, Als: 0.02%~0.04%; production method: RH vacuum furnace treatment after converter smelting; heating of billet; segmental rolling; segmental variable speed cooling: coiling; . Without adding Nb, V, Mo and other alloys, the invention can not only ensure the tensile strength above 1200MPa, but also make the elongation ≥ 15%, and the thickness of the steel plate is 7~12mm, so as to meet the forming requirements of thick gauge high strength steel. , and reduce the alloy cost by at least 10%.

Description

technical field [0001] The invention relates to a hot-rolled steel for automobiles and a production method thereof, in particular to a high-elongation hot-rolled structure control steel with a tensile strength greater than 1200MPa and a production method; and is suitable for steel plates with a thickness of 7-12mm. Background technique [0002] In recent years, the automotive industry, especially commercial vehicles, semi-trailers, passenger cars and other market segments, has become more and more urgent to reduce weight. Related manufacturers have put forward clear requirements for vehicle weight reduction to meet the mandatory national standard GB1589-2016, etc. regulatory requirements. On the one hand, the wheels, axles, saddles and other structural parts of commercial vehicles and other models need to be drawn, reamed and other forming processes in the manufacturing process. There are clear requirements for edge forming performance. On the other hand, the thickness of s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/06C22C38/04C22C38/02C21C7/10C21D8/02C21D11/00
CPCC21C7/10C21D8/0205C21D8/0247C21D11/005C21D2211/001C21D2211/002C21D2211/008C22C38/002C22C38/02C22C38/04C22C38/06
Inventor 刘斌李利巍邹航杨海林陆在学张扬刘登文梁文何亚元
Owner 武汉钢铁有限公司
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