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Low-cost and high-strength steel for automobile crossbeam and manufacturing method thereof

A technology of automobile girders and manufacturing methods, which is applied in the direction of manufacturing tools, manufacturing converters, metal rolling, etc., can solve the problems of high rolling capacity requirements of rolling mills, low rough rolling temperature requirements, etc., and achieve good low temperature toughness, excellent Welding performance, good plastic effect

Active Publication Date: 2010-08-18
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This patent uses the addition of V for precipitation strengthening, but in order to ensure the alloying effect of V, the rough rolling temperature requirement of this patent is low, and the rolling capacity of the rolling mill is high during rolling.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0034] Example 1: The chemical composition of selected high-strength steel, the weight percentage is: C: 0.055%, Si: 0.20%, Mn: 1.70%, Nb: 0.05%; Ti: 0.11%; P: 0.01%; S: 0.006%; The rest is iron Fe. The above-mentioned prepared raw materials are smelted on a 120-ton converter and continuously cast into a continuous casting slab of 175mm×1010mm×11800mm. The continuous casting slab is heated to 1240°C and rolled on a 1500mm hot rolling mill. The rough rolling start temperature The control is 1160°C, the rough rolling and finish rolling temperature is controlled at 1060°C, the rough rolling is 5 passes, and the thickness of the intermediate billet is 27mm. The temperature is controlled at 900°C, and there are 6 passes of finish rolling. The average reduction of each pass of the first few passes of finish rolling is controlled at 25-40%, and the last pass is controlled at 10-15% in order to ensure the shape of the plate. Water cooling is adopted between the finishing mills; the a...

example 2

[0036] Example 2: The chemical composition of selected high-strength steel, the weight percentage is: C: 0.06%, Si: 0.36%, Mn: 1.75%, Nb: 0.06%; Ti: 0.12%; P: 0.01%; S: 0.005% ; The rest is iron Fe.

[0037]The above-mentioned prepared raw materials are smelted on a 120-ton converter, and continuously cast into a continuous casting slab of 175mm×1010mm×11800mm. The continuous casting slab is heated to 1250°C and rolled on a 1500mm hot rolling mill. The control is 1170°C, the temperature of rough rolling and finish rolling is controlled at 1060°C, rough rolling is carried out for 5 passes, and the thickness of the intermediate billet is 28mm. After that, the intermediate billet is finished rolling. The temperature is controlled at 920°C, and the average reduction of each pass in the first few passes of finishing rolling is controlled at 25-35%. After the above-mentioned rolling, the billet is water-cooled, the cooling rate is 20-30°C / S, and the coiling temperature is 600°C. Fi...

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PUM

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Abstract

The invention relates to a low-cost and high-strength steel for automobile crossbeam and a manufacturing method thereof. The automobile crossbeam comprises the following components by weight percent: C: 0.04-0.10%; Si: 0.2%-0.5%; Mn: 1.4-2.0%; P: less than 0.015%; S: less than 0.01%; Ti: 0.08-0.15%; Nb: 0.04-0.07%; N: less than 0.005%; O: less than 0.002% and the balance of Fe. The components for producing the automobile crossbeam are rolled by controlled rolling and cooling technology and can achieve the following comprehensive properties: ReL: 700-800MPa, delta >=18%.In addition, the components feature in excellent cold-bending and welding property, can meet manufacturing requirements of steel for the automobile crossbeam and enjoy excellent impact toughness.

Description

technical field [0001] The invention relates to a low-cost high-strength automobile frame steel and a manufacturing method thereof, wherein the tensile strength reaches more than 700 MPa, and belongs to the technical field of hot-rolled high-strength steel plate production. Background technique [0002] Automobile frame steel is mainly used for stamping structural parts such as frame longitudinal beams and beams of trucks and light vehicles. The main specifications currently on the market are: 16MnL, 510L and 610L. Among them, low-grade 16MnL and 510L are widely used; 610L gradually replaced the above products and began to be widely promoted. [0003] In recent years, in accordance with the national requirements for energy conservation and emission reduction, automobile manufacturers have reduced the weight of automobiles one after another, and the requirements for the grade of beam steel have become higher and higher. For this reason, it is necessary to develop new produc...

Claims

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Application Information

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IPC IPC(8): C22C38/14C21C5/28C21C7/00B21B1/46B21B37/74B21B37/16
Inventor 赵培林李洪建王建景张桂南王学新孙丽荣张明金周平刘莱萌王金秀路峰吴会亮王博
Owner SHANDONG IRON & STEEL CO LTD
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