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Low carbon alloy steel treatment method

A low-carbon alloy steel and a processing method technology, applied in the field of metal processing, can solve the problems of increasing the strength and plastic product of steel, and achieve the effects of promoting the distribution of alloy elements, increasing the enrichment degree and increasing the aggregation effect

Active Publication Date: 2017-02-22
秦皇岛宏兴钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the strength and plasticity of the steel obtained by this method need to be further improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Steel slabs with the following compositions were smelted in a ZG-50 vacuum induction melting furnace and forged into slabs with a thickness of 75mm;

[0036] 0.19wt% of C; 1.5wt% of Si; 1.3wt% of Mn; 0.010wt% of P; 0.017wt% of Al; 0.009wt% of S; 0.0003wt% of B; the balance of Fe;

[0037] The slab is heated to 1200°C in a high-temperature box-type heating furnace and kept for 3 hours to homogenize the composition of alloy elements, and then it is hot-rolled. After rolling at 950°C for 5 passes, a hot-rolled sheet for thermal simulation experiments with a thickness of 15mm was rolled, and turned into a cylindrical sample of Φ8mm×12mm;

[0038] The sample was heated to 770°C at a rate of 10°C / s, and then the sample was immediately heated for 1s -1 The deformation rate was compressed by 10%, held for 1800s, and then water quenched to room temperature.

Embodiment 2

[0045] Steel slabs with the following compositions were smelted in a ZG-50 vacuum induction melting furnace and forged into slabs with a thickness of 75mm;

[0046] 0.18wt% C; 1.58wt% Si; 2.06wt% Mn; 0.41wt% Cu; 0.33wt% Ni; 0.008wt% P; 0.005wt% S; Fe;

[0047] The slab is heated to 1200°C in a high-temperature box-type heating furnace and kept for 3 hours to homogenize the composition of alloy elements, and then it is hot-rolled. After rolling at 950°C for 5 passes, a hot-rolled sheet for thermal simulation experiments with a thickness of 15mm was rolled, and turned into a cylindrical sample of Φ8mm×12mm;

[0048] The sample was heated to 740°C at a rate of 10°C / s, and then the sample was immediately heated for 1s -1 The deformation rate was compressed by 10%, held for 600s, and then water quenched to room temperature.

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Abstract

The invention provides a low carbon alloy steel treatment method. The low carbon alloy steel treatment method comprises the following steps that (a) a low carbon alloy steel blank is cast and forged into a plate blank; (b) the plate blank is subjected hot rolling to obtain an finish-rolled plate; and (c) the end-rolled plate is deformed immediately after being heated to the two-phase region temperature and subjected to water quenching to the room temperature after heat preservation. According to the low carbon alloy steel treatment method, two-phase region heat preservation alloy element partition behaviors, vacancy generation of two-phase region heat deformation and interstitial atoms of low carbon alloy steel are combined to achieve the effect of improving alloy element partition, the effect of inherent alloy elements in steel is achieved, the concentration degree, in austenite (room temperature martensite), of the alloy elements is improved on the basis that original C partition is fully achieved, and favorable support is provided for stabilizing more residual austenite and making up strength and ductility product reduction in the subsequent Q and P treatment technology; and experimental results show that the concentration degree of the alloy elements can be increased by 2%-5% through the low carbon alloy steel treatment method.

Description

technical field [0001] The invention belongs to the technical field of metal processing, and in particular relates to a processing method for low-carbon alloy steel. Background technique [0002] Most of the Q&P treated steel is C-Si-Mn series steel, and the carbon content is generally 0.2-0.6 (mass fraction, %). Higher carbon content not only improves the strength, but also enhances the distribution effect, and plays a role in improving the strength and plasticity. , but too high C content will also increase the hardenability of steel, increase the heat-affected zone during welding, cause welding cracking, reduce welding performance, and increase the cold brittleness and aging sensitivity of steel. Therefore, the carbon content of steel for automobiles generally does not exceed 0.2%; however, the carbon content cannot be too low, otherwise the carbon distribution effect will be limited to a certain extent, on the one hand, the amount of retained austenite after quenching wi...

Claims

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Application Information

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IPC IPC(8): C21D8/02C21D1/18C22C38/04C22C38/02C22C38/16C22C38/08C22C38/06
CPCC21D1/18C21D8/0226C21D8/0247C21D8/0257C22C38/02C22C38/04C22C38/06C22C38/08C22C38/16
Inventor 魏英立宋进英郑小平李红斌张荣华陈连生田亚强董福涛刘倩万德成马劲红
Owner 秦皇岛宏兴钢铁有限公司
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