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Low-temperature hot-stamped automobile part, and hot stamping process and manufacturing method thereof

A technology for auto parts and manufacturing methods, applied in the field of auto parts and their manufacturing, can solve the problems of large thermal energy consumption and high heating temperature

Inactive Publication Date: 2017-06-30
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are not many international studies on how to improve the strength and plasticity of steel for hot stamping through the steel itself, so as to improve the tensile ductility of parts while ensuring the strength of parts
In addition, the heating temperature of steel for hot stamping is usually between 930 and 950 °C, the heating temperature is high, and the heat energy consumption is also large

Method used

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  • Low-temperature hot-stamped automobile part, and hot stamping process and manufacturing method thereof
  • Low-temperature hot-stamped automobile part, and hot stamping process and manufacturing method thereof
  • Low-temperature hot-stamped automobile part, and hot stamping process and manufacturing method thereof

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Experimental program
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Effect test

Embodiment 1-6 and comparative example 1-2

[0095] The auto parts in above-mentioned embodiment and comparative example adopt following steps to make:

[0096] (1) Smelting: adopt converter smelting, control the mass percent of each chemical element as shown in Table 1;

[0097] (2) Casting: casting slabs are obtained through continuous casting;

[0098] (3) Hot rolling: the billet is heated to 1100-1250°C and then controlled rolling, the starting rolling temperature is 950-1150°C, the final rolling temperature is 750-900°C, the thickness of the hot-rolled plate is not more than 20mm, and the coiling temperature is 500~850℃, then cooled to room temperature, so that the microstructure is full martensitic structure;

[0099] (4) Annealing: annealing in a bell furnace, the annealing temperature is 550-850°C, the time is not less than 1h, and the microstructure obtained after annealing contains austenite with a volume fraction of 20-40%;

[0100] (5) pickling: pickling to remove the iron oxide scale produced in the hot ro...

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Abstract

The invention discloses a low-temperature hot-stamped automobile part. The microstructure of the low-temperature hot-stamped automobile part is composed of martensite, austenite and ferrite. The chemical elements of the low-temperature hot-stamped automobile part comprise, by mass, 0.1-0.3% of C, 0.1-2.0% of Si, 3-7% of Mn, 0.01-0.06% of Al, 0.02% or less of P, 0.02% or less of S, 0.005% or less of N, and the balance Fe and other inevitable impurities. In addition, the invention discloses a hot stamping process of the low-temperature hot-stamped automobile part. The invention further discloses a manufacturing method of the low-temperature hot-stamped automobile part. The manufacturing method sequentially includes the steps of (1) smelting, (2) casting, (3) hot rolling, (4) annealing, (5) acid pickling, (6) cold rolling and (7) hot stamping, wherein the heating holding temperature of hot stamping is 700-850 DEG C, the holding time is 2-10 min, and thus complete austenitizing is completed. The low-temperature hot-stamped automobile part has high strength and meanwhile achieves good stretching ductility and excellent strength and plasticity matching.

Description

technical field [0001] The invention relates to a metal part and a manufacturing method thereof, in particular to an automobile part and a manufacturing method thereof. Background technique [0002] With the increasing demand for automobile safety and weight reduction and energy saving in related industries, the strength of automobile parts is also gradually increasing. In the field of automobile manufacturing, 1180MPa dual-phase steel has been widely used in cold stamping steel. At the same time, 1500MPa martensitic steel is also applied to parts with simple shapes such as bumpers. However, due to the complex shape of many automotive reinforcements, 1500MPa martensitic steel cannot be cold stamped, so hot stamping came into being. Hot stamping is to heat the steel plate to above 750°C, heat it for a certain period of time to fully austenize it, then perform hot stamping, and quench the steel plate to room temperature through a mold to obtain full martensitic parts with a ...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C38/02C22C38/06C22C38/12C22C38/14C21D8/00C21D8/02
CPCC22C38/04C21D8/005C21D8/0226C21D8/0236C21D8/0263C21D2211/001C21D2211/005C21D2211/008C22C38/02C22C38/06C22C38/12C22C38/14
Inventor 韩启航张玉龙王利徐伟力罗爱辉冯国武
Owner BAOSHAN IRON & STEEL CO LTD
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