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Economical high-toughness 800MPa-level automobile beam steel and production method thereof

A technology of automobile girder steel and production method, which is applied in the direction of manufacturing converters, etc., can solve problems such as unfavorable application and promotion, increase production cost, reduce product cost performance and market competitiveness, increase descaling effect, avoid hemp pits, The effect of saving production consumption

Active Publication Date: 2019-03-26
ANYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This invention belongs to the production method of high manganese and high niobium microalloying, which increases the production cost of the product, reduces the cost performance and market competitiveness of the product, and is not conducive to the mass application and promotion of the product

Method used

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  • Economical high-toughness 800MPa-level automobile beam steel and production method thereof
  • Economical high-toughness 800MPa-level automobile beam steel and production method thereof
  • Economical high-toughness 800MPa-level automobile beam steel and production method thereof

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Experimental program
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Effect test

Embodiment 1

[0027] In this embodiment, the process of the 1780 production line of our company to produce a product specification of 10mm thick and 800MPa grade automobile frame steel is taken as an example to further illustrate the present invention. The automobile frame steel of this embodiment is proportioned according to the following weight percentages: C: 0.08%, Si: 0.10%, Mn: 1.73%, P: 0.010%, S: 0.006%, Mo: 0.135%, Nb: 0.025%, Ti : 0.13%, N: 0.002%, Al: 0.035%, and the balance is Fe and unavoidable impurities.

[0028] The production process route of the automobile frame steel in this embodiment includes top-bottom combined blowing converter, LF refining, slab continuous casting, 1780mm rolling mill rolling, and front-stage cooling.

[0029] Among them, the continuous casting slab is heated in a furnace within 24 hours. The temperature of the heating furnace is 1260 ° C, the heating time is 140 min, and the finishing temperature of the rough rolling is 1030 ° C. The rough rolling p...

Embodiment 2

[0035] In this embodiment, the process of producing 7mm thick and 800MPa grade automobile frame steel by the company's 1780 production line is taken as an example to further illustrate the present invention. The automobile frame steel of this embodiment is proportioned according to the following weight percentages: C: 0.07%, Si: 0.14%, Mn: 1.68%, P: 0.011%, S: 0.002%, Mo: 0.131%, Nb: 0.038%, Ti : 0.13%, N: 0.004%, Al: 0.045%, the balance is Fe and unavoidable impurities.

[0036] The production process route of the automobile frame steel in this embodiment includes top-bottom combined blowing converter, LF refining, slab continuous casting, 1780mm rolling mill rolling, and front-stage cooling.

[0037] Among them, the continuous casting slab is heated in a furnace within 24 hours. The temperature of the heating furnace is 1260 ° C, the heating time is 140 min, and the finishing temperature of rough rolling is 1060 ° C. The rough rolling process is 3 passes, and rough descaling i...

Embodiment 3

[0043] In this embodiment, the process of producing 4.5mm thick and 800MPa grade automobile frame steel by the company's 1780 production line is taken as an example to further illustrate the present invention. The automobile frame steel of this embodiment is proportioned according to the following weight percentages: C: 0.07%, Si: 0.16%, Mn: 1.65%, P: 0.011%, S: 0.002%, Mo: 0.131%, Nb: 0.030%, Ti : 0.10%, N: 0.004%, Al: 0.043%, and the balance is Fe and unavoidable impurities.

[0044] The production process route of the automobile frame steel in this embodiment includes top-bottom combined blowing converter, LF refining, slab continuous casting, 1780mm rolling mill rolling, and front-stage cooling.

[0045] Among them, the continuous casting slab is heated in a furnace within 24 hours. The temperature of the heating furnace is 1260°C, the heating time is 140min, and the finishing temperature of the rough rolling is 1065°C. The rough rolling process is 3 passes, and rough desc...

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Abstract

The invention provides economical high-toughness 800MPa-level automobile beam steel. The economical high-toughness 800MPa-level automobile beam steel is prepared from the following components in percentage by weight: 0.07-0.11% of C, 1.55-1.80% of Mn, 0.05-0.20% of Si, less than or equal to 0.015% of P, less than or equal to 0.008% of S, 0.020-0.040% of Nb, 0.10-0.20% of Mo, 0.03-0.06% of Al, 0.09-0.13% of Ti, less than or equal to 0.005% of N, and the balance of Fe and inevitable impurities. The invention further provides a production method for the economical high-toughness 800MPa-level automobile beam steel, and the production method comprises the following steps: a top and bottom re-blowing converter process, LF refining, slag continuous casting, 1780mm mill rolling, and front-sectioncooling. The automobile beam steel has high strength, high toughness and low production cost. While used as an automobile structure part, the automobile beam steel can avoid occurrence of a cracking phenomenon in use in processes such as shearing, stamping, bending and welding.

Description

technical field [0001] The invention relates to the technical field of iron and steel materials, in particular to automobile frame steel with a high toughness and tensile strength of 800 MPa and a production method thereof. Background technique [0002] Steel for automobile frame is mainly used to manufacture automotive longitudinal beams, beams, bumpers and other structural parts. Due to the need to bear heavy loads, and the car is subject to various impacts, torsion and other complex stresses during driving, the work of automobile frame The conditions are quite demanding, not only requiring high strength, but also good cold forming performance, weldability and fatigue resistance. During the user's use, the automobile frame must meet various processing requirements such as shearing, thermal cutting, stamping, punching, bending, and welding. [0003] With the development of society and economy, low-carbon, energy-saving, and environmental protection have become the new deve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C21C5/35C21D8/02C22C33/04
CPCC21C5/35C21D8/0205C21D8/0226C22C33/04C22C38/001C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14
Inventor 李勇韦弦万国喜刘艳玲郑飞周茂奇张大江黄重邓杭州陈冬至刘广超李志广王向松
Owner ANYANG IRON & STEEL
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