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Niobium-vanadium composite microalloyed hot forming steel and production method thereof

A technology of microalloying and hot forming steel, applied in the field of hot forming steel, can solve the problems of delayed fracture performance and low cold bending performance, achieve the effect of reducing critical cooling transformation rate, widening process parameter window, and improving strength and toughness

Pending Publication Date: 2021-12-31
CHONGQING CHANGAN AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] The purpose of the present invention is to provide a niobium-vanadium composite microalloyed hot forming steel and its production method to solve the problems of low hydrogen-induced delayed fracture performance and cold bending performance of current steel products

Method used

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  • Niobium-vanadium composite microalloyed hot forming steel and production method thereof
  • Niobium-vanadium composite microalloyed hot forming steel and production method thereof
  • Niobium-vanadium composite microalloyed hot forming steel and production method thereof

Examples

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Effect test

Embodiment 1

[0064] Embodiment 1, a kind of niobium-vanadium composite microalloyed hot forming steel, comprising the following components by weight percentage: 0.24% of C, 0.25% of Si, 1.25% of Mn, 0.02-0.06% of Al, 0.25% Cr, 0.003% B, 0.04% Ti, 0.045% Nb, 0.054% V, N≤30ppm, P≤0.020%, S≤0.010, the balance is Fe and other unavoidable impurities.

[0065] A method for producing niobium-vanadium composite microalloyed hot-formed steel. The raw materials are weighed according to the weight percentage of each component of the above-mentioned niobium-vanadium composite micro-alloyed hot-formed steel, and the molten iron slag removal, converter smelting, and slag removal Steel, ladle deoxidation alloying, continuous casting, hot rolling, coiling, cold rolling, continuous annealing, hood annealing, hot stamping.

[0066] The end temperature of the converter smelting is controlled at 1200°C;

[0067] The hot rolling temperature is 900°C;

[0068] After hot rolling, it is coiled at a temperature ...

Embodiment 2

[0096] Example 2, the hot forming process parameters are as follows: heat the steel backed to 870°C and keep it warm for 6 minutes, then take out the high temperature steel within 14 to 15 seconds and transfer it to the mold for hot stamping and quenching. Quenching and rapid cooling to 200°C for mold release, and the rest are the same as in Example 1. According to the performance test, compared with the comparative example, it has good mechanical properties and better hydrogen-induced delayed fracture performance.

Embodiment 3

[0097] Example 3, the hot forming process parameters are as follows: heat the steel back to 970°C and keep it warm for 3 minutes, then take out the high-temperature steel within 8 to 9 seconds and transfer it to the mold for hot stamping and quenching. Quenching and rapid cooling to 150°C for mold release, and the rest are the same as in Example 1. According to the performance test, compared with the comparative example, it has good mechanical properties and better hydrogen-induced delayed fracture performance.

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Abstract

The invention discloses niobium-vanadium composite microalloyed hot forming steel and a production method thereof. The niobium-vanadium composite microalloyed hot forming steel comprises the following components, by weight, 0.23-0.29% of C, 0.2-1.0% of Si, 1.0-2.5% of Mn, 0.02-0.06% of Al, 0.2 -1.0 % of Cr, 0.001-0.003% of B, 0.01-0.04% of Ti, 0.03-0.08% of Nb, 0.03-0.08% of V, less than or equal to 30ppm of N, less than or equal to 0.020% of P, less than or equal to 0.010% of S and the balance Fe and other inevitable impurities. The problem that existing steel is low in hydrogen-induced delayed fracture performance and cold bending performance is solved. The production method comprises the following steps of weighing the raw materials according to the weight percentage of each component of the niobium-vanadium composite microalloyed hot forming steel, and sequentially carrying out molten iron slagging-off, converter smelting, slag-stopping tapping, ladle deoxidation alloying, continuous casting, hot rolling, coiling, cold rolling, continuous annealing, cover annealing and hot stamping forming.

Description

technical field [0001] The invention relates to hot-forming steel, in particular to niobium-vanadium composite micro-alloyed hot-forming steel and a production method thereof. Background technique [0002] Lightweight is a comprehensive technical field that integrates advanced structures, materials, and manufacturing processes, among which materials are the basis for realizing lightweight vehicles. At present, in order to ensure high safety of vehicles on the basis of light weight, the strength level of steel used in automobiles at home and abroad is increasing year by year, such as DP steel, TRIP steel, Q&P steel, TWIP steel, nano-bainite steel, martensitic steel, etc. body steel etc. DP (dual-phase) steel is a high-strength steel obtained by heat treatment in the critical zone or controlled rolling of low-carbon steel or low-alloy steel. Ultra-high strength steel with increased plasticity, also known as phase transformation induced plasticity steel, Q&P steel is a kind o...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/24C22C38/26C22C38/28C22C38/32C22C38/38C21D7/13C21D8/02
CPCC22C38/02C22C38/04C22C38/06C22C38/38C22C38/32C22C38/28C22C38/26C22C38/24C22C38/001C21D7/13C21D8/0205C21D8/0226C21D8/0236C21D8/0247C21D2211/008
Inventor 冷佳寰陈东代建权
Owner CHONGQING CHANGAN AUTOMOBILE CO LTD
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