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Ultra-low-carbon bake hardening steel sheet and production method thereof

A technology of bake hardening and production method, applied in the metallurgical field, can solve the problems of increased cost and fluctuation of the bake hardening value of the finished product, and achieves the effects of good comprehensive performance, stable bake hardening value and low cost

Active Publication Date: 2019-01-08
TANGSHAN IRON & STEEL GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] CN 100465322 uses V microalloying to control the amount of free carbon atoms in steel. Since V fixes C by forming VC in the coiling process, on the one hand, it needs to add a large amount of V, which increases the cost. On the other hand, the continuous annealing The temperature and time requirements are strict, otherwise the free carbon content produced by the decomposition of VC during the high temperature annealing process has a wide range of changes, which will lead to fluctuations in the bake hardening value of the finished product

Method used

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  • Ultra-low-carbon bake hardening steel sheet and production method thereof
  • Ultra-low-carbon bake hardening steel sheet and production method thereof

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Effect test

Embodiment 1

[0022] The thickness of the ultra-low-carbon bake-hardened steel plate in this embodiment is 0.6 mm, and its chemical composition and mass percentage are shown in Table 1.

[0023] The production method of the ultra-low-carbon bake-hardened steel plate in this embodiment includes steelmaking, continuous casting, slab heating, hot rolling, laminar cooling, acid rolling, continuous annealing, and smoothing processes. The specific process steps are as follows:

[0024] (1) Steelmaking process: see Table 1 for the chemical composition and mass percentage of the tapping molten steel; then continuously cast into slabs;

[0025] (2) Slab heating process: divided into the first heating section, the second heating section, the third heating section and the soaking section, the slab is in the furnace for 135 minutes, the temperature of the third heating section is 1230°C, and the temperature of the soaking section is 1210°C;

[0026] (3) Hot rolling process: rough rolling is reciprocati...

Embodiment 2

[0033] The thickness of the ultra-low-carbon bake-hardened steel plate in this embodiment is 0.7mm, and its chemical composition and mass percentage are shown in Table 1.

[0034] The production method of the ultra-low-carbon bake-hardened steel plate in this embodiment includes steelmaking, continuous casting, slab heating, hot rolling, laminar cooling, acid rolling, continuous annealing, and smoothing processes. The specific process steps are as follows:

[0035] (1) Steelmaking process: see Table 1 for the chemical composition and mass percentage of the tapping molten steel; then continuously cast into slabs;

[0036] (2) Slab heating process: It is divided into the first heating section, the second heating section, the third heating section and the soaking section. The time for the slab in the furnace is 130 minutes, the temperature of the third heating section is 1180°C, and the temperature of the soaking section is 1150°C;

[0037] (3) Hot rolling process: rough rolling ...

Embodiment 3

[0044] The thickness of the ultra-low-carbon bake-hardened steel plate in this embodiment is 0.8mm, and its chemical composition and mass percentage are shown in Table 1.

[0045] The production method of the ultra-low-carbon bake-hardened steel plate in this embodiment includes steelmaking, continuous casting, slab heating, hot rolling, laminar cooling, acid rolling, continuous annealing, and smoothing processes. The specific process steps are as follows:

[0046] (1) Steelmaking process: see Table 1 for the chemical composition and mass percentage of the tapping molten steel; then continuously cast into slabs;

[0047] (2) Slab heating process: divided into the first heating section, the second heating section, the third heating section and the soaking section, the slab is in the furnace for 120 minutes, the temperature of the third heating section is 1250°C, and the temperature of the soaking section is 1220°C;

[0048] (3) Hot rolling process: rough rolling is reciprocatin...

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Abstract

The invention discloses an ultra-low-carbon bake hardening steel sheet and a production method thereof. The steel sheet comprises following chemical components in percentage by mass: 0.002%-0.003% ofC, smaller than or equal to 0.03% of Si, 0.35%-0.45% of Mn, 0.045%-0.060% of P, smaller than or equal to 0.008% of S, 0.025%-0.055% of Als, 0.008%-0.015% of Nb, 0.0005%-0.0015% of B, smaller than or equal to 0.004% of N, 0.0008%-0.0015% of solid solution C and the balance of Fe and inevitable impurity elements. The production method comprises processes as follows: steelmaking, continuous casting,slab heating, hot rolling, laminar cooling, acid rolling, continuous annealing and leveling. The ultra-low-carbon bake hardening steel sheet is obtained by adopting ultra-low-carbon component design and P and Mn solution strengthening and adding Nb for fixing part of C on the basis of matching of corresponding hot rolling, acid rolling and continuous annealing processes.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to an ultra-low-carbon bake-hardening steel plate and a production method thereof. Background technique [0002] Ultra-low carbon bake-hardening steel is a kind of high-quality automotive steel plate that has a low yield strength before stamping and forming. After stamping and aging treatment of baking paint, the yield strength can be improved to a certain extent. It is mainly used for processing automobiles. Outer panel. It is characterized by the organic combination of product strength, deep drawing performance and anti-sag performance of parts. In bake-hardening steel, the expected bake-hardening value mainly depends on the solid solution C content, and it is generally considered that the appropriate range is 10-15ppm. In order to control interstitial atoms in steel, Nb, Ti or V is required to control the kind and quantity of interstitial atoms in steel. [0003...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C38/02C22C38/06C22C38/12C21D8/02
CPCC21D8/0226C21D8/0236C21D8/0247C22C38/004C22C38/02C22C38/04C22C38/06C22C38/12C22C38/32
Inventor 刘丽萍李桂兰谷田田秀刚郭志凯冯晓勇张涛史文礼尹树春
Owner TANGSHAN IRON & STEEL GROUP
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