High-elongation hot-rolled microstructure regulating steel with tensile strength greater than or less than 800MPa and production method thereof

A technology with high tensile strength and high elongation, which is applied in the direction of temperature control, process efficiency improvement, heat treatment furnace, etc., can solve the problems of many alloying elements, relatively high cost, and inability to meet the forming requirements of deformed complex parts, etc. Simple, alloy cost reduction effect

Active Publication Date: 2020-06-26
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 lower limit of the elongation in this document is only 15%, which cannot meet the forming requirements of deformed and complex parts. At the same time, the thickness of the finished product is only 1.2-4.0mm, which cannot meet the needs of thicker specification steel, and there are many alloy elements, and the relative cost is high.

Method used

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  • High-elongation hot-rolled microstructure regulating steel with tensile strength greater than or less than 800MPa and production method thereof
  • High-elongation hot-rolled microstructure regulating steel with tensile strength greater than or less than 800MPa and production method thereof
  • High-elongation hot-rolled microstructure regulating steel with tensile strength greater than or less than 800MPa and production method thereof

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Embodiment Construction

[0044] The present invention is described in detail below:

[0045] Table 1 is the value list of the chemical components of each embodiment of the present invention and comparative examples;

[0046] Table 2 is the main process parameter list of each embodiment of the present invention and comparative example;

[0047] Table 3 is a list of the performance tests of the various embodiments of the present invention and comparative examples.

[0048] Each embodiment of the present invention is produced according to the following steps:

[0049] 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 electromagnetic stirring is performed during the continuous casting process;

[0050] 2) Heating the slab, the heating temperature is controlled at 1260-1300°C, and the heating time is 60-80min;

[0051] 3) Carry out segmental rolling, during which,...

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Abstract

The invention discloses high-elongation hot-rolled microstructure regulating steel with tensile strength greater than or less than 800MPa. The steel comprises the following components in percentage byweight: 0.07-0.09% of C, 1.95-2.10% of Mn, 0.70%-0.80% of Si, less than or equal to 0.008% of P, less than or equal to 0.002% of S and 0.02-0.04% of Als; the production method comprises the followingsteps of: carrying out RH vacuum furnace treatment after converter smelting; heating a casting blank; rolling in sections; variable speed cooling in sections: coiling; heat insulation; smoothing treatment. Under the premise of ensuring the tensile strength above 800MPa, the steel can make the yield strength be greater than or equal to 500MPa, elongation greater than or equal to 25%, product of strength and elongation greater than or equal to 20GPa% and yield ratio less than 0.65, the steel can meet the forming requirement of thick specifications and high strength steel, and alloy elements aresimple without adding precious alloys such as Nb, V, Mo, etc.; and the alloy cost can be reduced 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 800MPa and a production method thereof; and is suitable for steel plates with a thickness of 2-12mm. 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 thickne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/04C22C38/02C22C38/04C22C38/06C21D6/00C21D8/02C21D9/00B21B37/74
CPCB21B37/74C21D6/005C21D6/008C21D8/0221C21D9/0081C21D2211/001C21D2211/005C21D2211/008C22C33/04C22C38/002C22C38/02C22C38/04C22C38/06Y02P10/20
Inventor 刘斌赵江涛李利巍张扬骆海贺刘亮谭佳梅王立新
Owner 武汉钢铁有限公司
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