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CSP production process of steel for automobile crossbeam

A technology of automobile beam steel and production process, which is applied in the direction of manufacturing tools, metal processing equipment, workpiece surface treatment equipment, etc., can solve the problems affecting the utilization rate of materials and materials, achieve low manufacturing cost, low alloy cost, and easy stable control Effect

Active Publication Date: 2007-06-06
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The 510MPa grade girder plates of various brands currently available in the domestic market cannot meet the stamping requirements under the three conditions at the same time
[0004] At present, the production process of domestic girder steel plates adopts the thick slab hot rolling process of the traditional process. In order to ensure the shape of the girder plate and the shape of the plate when cutting and blanking by the automobile factory, there will be no warping defects, Baosteel and Wuhan Iron and Steel. All automobile girder plates are hot-rolled into coils and then straightened by the primary and secondary straightening equipment on the cross-cutting unit. Although the shape and dimensional accuracy requirements of the girder plate are met, due to the internal stress In the use of the automobile factory, when cutting strips, some small strips still have side bending defects, which affects the material utilization rate.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] After the blank is passed through the converter process and the LF refining process, the chemical weight components in the steel are controlled as follows: C: 0.17%, Si: 0.41%, Mn: 1.38%, P: 0.014%, S: 0.0020%, Ti: 0.015%, Als: 0.020%, N: 34.2PPm, billet thickness is 70mm, casting speed is 4.2m / min, heating temperature is 1150°C, descaling high pressure water pressure is 200 / 360bar, final rolling temperature is 820°C, cooling after rolling is The two-end control cooling mode of rapid cooling + front-end laminar cooling is used to coil the rolled plate at a temperature of 620°C, and CVC is used for CSP rolling + and PCFC control.

[0015] The mechanical properties of embodiment are as shown in table 1:

[0016] Yield strength (MPa)

Embodiment 2

[0018] After the blank is passed through the converter process and the LF refining process, the chemical weight components in the steel are controlled as follows: C: 0.18%, Si: 0.38%, Mn: 1.36%, P: 0.010%, S: 0.0009%, Ti: 0.018%, Als: 0.032%, N: 44PPm, billet thickness is 70mm, casting speed is 4.3m / s, heating temperature is 1130°C, descaling high pressure water pressure is 280 / 360bar, final rolling temperature is 800°C, cooling after rolling is fast Cooling + front-end laminar cooling is controlled by both ends of the cooling mode, and the rolled plate is coiled at a temperature of 620°C. CSP rolling is controlled by CVC+ and PCFC.

[0019] The mechanical properties of embodiment 2 are as shown in table 1:

[0020] Yield strength (MPa)

Embodiment 3

[0022] After the billet goes through the converter process and LF refining process, the chemical weight composition of the steel is controlled as follows: C: 0.20%, Si: 0.5%, Mn: 1.5%, P: 0.011%, S: 0.0013%, Ti: 0.02% , Als: 0.030%, N: 0.0062PPm, billet thickness is 70mm, casting speed is 4.5m / s, heating temperature is 1140°C, descaling high pressure water pressure is 200 / 360bar, final rolling temperature is 810°C, cooling after rolling The two-end controlled cooling mode of rapid cooling + front-end laminar cooling is adopted, and the rolled plate is coiled at a temperature of 610°C. CSP rolling is controlled by CVC+ and PCFC.

[0023] The mechanical properties of embodiment 3 are as shown in table 1:

[0024] Yield strength (MPa)

Tensile strength (MPa)

Elongation (%)

Yield ratio

Thickness accuracy (mm)

Example 2

410

540

31

0.76

6.0±0.04

[0025] Embodiment 1 is adopted in Chongqing Hongyan Automobile Fac...

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PUM

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Abstract

The production process of SCP for automobile crossbeam includes the steps of converter smelting, LF refining, continuous casting and rolling, coiling and product inspection. The steel of SCP for automobile crossbeam consists of C 0.16-0.20 wt%, Si 0.3-0.5 wt%, Mn 1.3-1.5 wt%, P not more than 0.015 wt%, S not more than 0.010 wt%, Ti 0.01-0.03 wt%, Als 0.020-0.035 wt%, N not more than 65 PPm. Compared with available technology, the present invention has the advantages of relatively low alloy content in the steel, easy control of the chemical comprise, short production process and low production cost.

Description

Technical field: [0001] The invention belongs to the technical field of producing low-alloy high-strength steel by the CSP process, in particular to the technical field of the CSP production process of hot-rolled automobile beam steel. Background technique: [0002] Automobile frame steel is mainly used for the production of automobile frame, which is a very important safety part for automobiles. Automobile girders are generally stamped and formed by hot-rolled girder plates. Due to different car models, the stamped car girders are also different, and the stamping equipment and processes of each production plant are different, so the girders on different models have different requirements for the mechanical properties and stamping performance of the girder plate. For example, the 510MPa beam steel currently used by Chongqing Hongyan Automobile for stamping beams uses hot-rolled plates without annealing to directly stamp beams: all cracks are stamped with 16ML, and the crack...

Claims

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Application Information

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IPC IPC(8): C22C38/14B21B1/46B21B37/16B21B37/56B21B37/74B21B45/08B21D5/00C21D8/00C21D11/00
Inventor 张建平朱涛胡学文饶添荣骆小刚胡晓春丁晓明石知机张宗宁解养国王强
Owner MAANSHAN IRON & STEEL CO LTD
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