800MPa grade automobile box steel and production method thereof

A production method and 800MPa technology, applied in the 800MPa grade automobile box steel and its production field, can solve the problems of difficult rolling process control and high production cost, and achieve the guaranteed strength index and overall performance, low production cost, and reduced The effect of the brittle transition temperature

Inactive Publication Date: 2015-04-29
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are different opinions in the industry on which strengthening element should be used to produce 800MPa grade automobile box steel. As far as the products on the market are concerned, Nb strengthening is the main method, but this strengthening method not only has high production costs, but also rolling Process control is difficult

Method used

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  • 800MPa grade automobile box steel and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1: The process steps of the production method of the 800MPa grade automobile box body steel are as follows.

[0020] The slab with the chemical composition shown in Example 1 in Table 1 is used for production, and the processes of heating, high-pressure water descaling, rough rolling, hot coil box crimping, finish rolling, cooling and coiling are adopted. Heating process: put the slab into the heating furnace for heating, the slab is required to be cold-rolled into the furnace, and the slab is required to be fully heated before ≤ 1000 °C; when the slab is > 1000 °C, it is required to be heated rapidly to reach the stipulated output of the slab The temperature prevents the austenite grain size from growing. The heating rate is 10°C / min, and the billet reaches 1220°C. 73 minutes in the oven. High-pressure water descaling process: After heating, the slab is descaled by high-pressure water and then rolled. Rough rolling process: In order to ensure the reduction...

Embodiment 2

[0022] Embodiment 2: The process steps of the production method of the 800MPa grade automobile box steel are as follows.

[0023] Put the slab shown in Example 2 in Table 1 into a hot furnace for heating. The slab requires cold rolling into the furnace, and the slab requires sufficient heating before ≤1000°C; when the slab is >1000°C, the heating rate is 12°C / min, the billet reaches 1220°C and comes out of the furnace; the total heating time is 151 minutes, the preheating section and the first heating section are in the furnace for 76 minutes, and the second heating section and soaking section are in the furnace for 75 minutes. After heating, the slab is descaled by high-pressure water and then roughed and finished rolled; the rough rolling Rt5 temperature is 1083°C, the thickness of the intermediate billet is 39.1mm; the finishing rolling temperature is 830°C, the coiling temperature is 580°C, and it is put into storage for slow cooling.

[0024] The product obtained in this...

Embodiment 3

[0025] Embodiment 3: The process steps of the production method of the 800MPa grade automobile box body steel are as follows.

[0026] Put the slab shown in Example 3 in Table 1 into a hot furnace for heating. The slab is required to be cold-rolled into the furnace, and the slab needs to be fully heated before ≤ 1000 ° C; when the slab is > 1000 ° C, the heating rate is 8 ° C / min, the billet reaches 1220°C and comes out of the furnace; the total heating time is 148 minutes, the preheating section and the first heating section are in the furnace for 72 minutes, and the second heating section and soaking section are in the furnace for 76 minutes. After heating, the slab is descaled by high-pressure water and then roughed and finished rolled; the rough rolling Rt5 temperature is 1067°C, the thickness of the intermediate billet is 39.1mm; the finishing rolling temperature is 854°C, the coiling temperature is 620°C, and it is put into storage for slow cooling.

[0027] The produc...

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Abstract

The invention discloses an 800MPa grade automobile box steel and a production method thereof. The production method comprises the steps of heating, rough rolling, finish rolling, cooling and coiling; the slab adopted contains the following components in percentage by mass: 0.08-0.12% of C, 0.20-0.40% of Si, 1.40-1.60% of Mn, less than or equal to 0.025% of P, less than or equal to 0.010% of S, 0.040-0.060% of V, 0.090-0.120% of Ti, greater than or equal to 0.015% of Als, less than or equal to 0.004% of N and the balance of Fe and inevitable impurities. The steel is strengthened by both vanadium and titanium and a precipitation strengthening effect can be developed more thoroughly, and the overall properties of the steel plate can be improved; besides, the load of rolling can be reduced thoroughly and the production difficulty can be reduced; the steel has the characteristics of low cost, high quality and easiness in machining. According to the method, the precipitation of carbon and carbonitrides, the recrystallization of the austenite and the deformation state of the austenite are controlled by controlling the tapping temperature of the rolled steel, the temperature of the intermediate slab, the finish rolling temperature and the coiling temperature; the strength index and the overall properties of the obtained product are guaranteed, and the product is low in production cost and easy to machine.

Description

technical field [0001] The invention relates to a steel for an automobile box and a production method thereof, in particular to an 800MPa grade steel for an automobile box and a production method thereof. Background technique [0002] In recent years, the automobile manufacturing industry has developed rapidly. With the continuous improvement of demand, automobile steel presents a development trend of lightweight and high strength. Studies have shown that every 10% reduction in vehicle weight can save fuel by 3% to 7%. As the main material that accounts for about 70% of the total weight of a car, steel must be developed in the direction of light weight, high strength, easy processing, and high precision. [0003] At present, the production of box steel is mainly carried out in two ways: ① traditional C-Mn strengthening; ② micro-alloy strengthening. Because the traditional C-Mn strengthening method has certain defects, such as: high C content, which has a certain impact on ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C21D8/00
Inventor 张春雷尹志尧陆凤慧王全利宫彦岭高玲玲
Owner HEBEI IRON AND STEEL
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