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Steel for extended automobile crossbeam and mfg, method thereof

An elongated car and manufacturing method technology, applied in the field of metal materials, can solve the problems of unqualified performance and low tensile strength, and achieve the effect of uniform and fine grain size, excellent comprehensive performance, and pure steel quality

Inactive Publication Date: 2006-08-30
宝钢集团上海梅山有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above alloying method produces automobile frame steel plates with a thickness of 4.0-8.0mm. If the production of automobile frame steel plates is greater than 8.0mm, due to high requirements for tensile strength and elongation, when the steelmaking chemical composition and hot rolling temperature fluctuate greatly, it will The tensile strength is low and the performance is unqualified. It is very difficult to meet the technical requirements of strength and toughness and the cold forming requirements of the automobile girder at the same time.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1: the chemical composition weight percent of the steel for elongated automobile frame is: %

[0026] C Si Mn P S Alt V Ti Nb

[0027] 0.073 0.207 1.26 0.021 0.007 0.050 0.047 0.026 0.032

[0028] Trace calcium, the content is 0.0015%, the rest is iron and residual trace impurities.

[0029] After desulfurization treatment, the self-produced molten iron enters the converter and adds scrap steel for smelting, deoxidation and alloying treatment, and then adds iron-calcium wire through the refining furnace for inclusion denaturation treatment. The refined molten steel is protected by continuous casting machine and cast into The 210×1180×8400mm slab is sent to the 1422mm hot rolling mill. Rolling process, the slab is sent into the heating furnace for heating, the slab heating temperature: 1210°C, the slab stay in the furnace time: 160Min, after the heated slab is released from the furnace, it is descaled by high pressure water, rough rolling, finish rolling, la...

Embodiment 2

[0031] Embodiment 2: the chemical composition weight percent of the steel for elongated automobile frame is: %

[0032] C Si Mn P S Alt V Ti Nb

[0033] 0.102 0.201 1.22 0.016 0.005 0.057 0.042 0.022 0.031

[0034] Trace calcium, the content is 0.0023%, the rest is iron and residual trace impurities.

[0035]After desulfurization treatment, the self-produced molten iron enters the converter and adds scrap steel for smelting, deoxidation and alloying treatment, and then through the refining furnace at the same time adding iron-calcium wire for inclusion denaturation treatment, and the refined molten steel is protected by continuous casting machine. Casting The 210×1180×8400mm slab is sent to the 1422mm hot rolling mill. Rolling process, the qualified slab is sent to the heating furnace for heating, the slab heating temperature: 1200 ℃, the slab stay in the furnace time: 165Min, after the heated slab is released from the furnace, it is descaled by high pressure water, rough ro...

Embodiment 3

[0037] Embodiment 3: the chemical composition weight percent of the steel for elongated automobile frame is: %

[0038] C Si Mn P S Alt V Ti Nb

[0039] 0.085 0.32 1.38 0.018 0.006 0.025 0.030 0.019 0.042

[0040] Trace calcium, the content is 0.0027%, the rest is iron and residual trace impurities.

[0041] After desulfurization treatment, the self-produced molten iron enters the converter and adds scrap steel for smelting, deoxidation and alloying treatment, and then through the refining furnace at the same time adding iron-calcium wire for inclusion denaturation treatment, and the refined molten steel is protected by continuous casting machine. Casting The 210×1180×8400mm slab is sent to the 1422mm hot rolling mill. Rolling process, the qualified slab is sent to the heating furnace for heating, the slab heating temperature: 1185 ℃, the slab stay in the furnace time: 155Min, after the heated slab is released from the furnace, it is descaled by high pressure water, rough r...

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Abstract

This invention relates to a king-sized automobile crossbeam using steal and its manufacturing method, tiny alloy elements of Nb, Ti, V are added in the steal. Their weight percentage is that C 0.07-0.12, ,Si 0.15-0.40, Mn 1.00-1.50,P less than 0.025,S less than 0.015,Nb 0.020-0.050,V 0.025-0.050, Ti 0.010-0.030,and tiny Ca, the rest are iron and other tiny impurities. Board butt is continuous cast, rolling and cooling control technique are used in hot rolling, the butt is heated to 1180-1250 degree centigrade, the temperature is 1020 to 1060 degree centigrade after rough rolling. Then it is finish rolled through blimp, the rolling temperature is maintained at 840 to 880 degree centigrade, the coiled sheet is cooled to 560 to 620 degree centigrade through laminar flow cooling. Because of the multiple unit tiny alloy elements design of the material chemical element, strong strength is got after above process and with good plastic laminar flow, cool formability, so it is specially propitious to king-sized automobile crossbeam making of cladding forming technique.

Description

technical field [0001] The invention relates to a metal material, relates to the technical field of hot-rolled metal strips in a continuous process, and in particular relates to a steel material for an automobile frame and a manufacturing method thereof. Background technique [0002] The lengthened longitudinal beam of the vehicle frame has a thickness of 10mm and a beam length of 15-16m. It is the main component used by the military to produce trucks, and it affects the stability and service life of the vehicle. It is required that the materials used for the production of longitudinal beams have sufficient strength and toughness, good cold formability and welding performance. [0003] At present, the hot-rolled steel plates used to produce automobile beams at home and abroad are mainly niobium alloyed steel, titanium alloyed steel or vanadium alloyed steel. Niobium alloyed automobile frame steel can be strengthened by refining the grain, but it must be realized by controll...

Claims

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Application Information

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IPC IPC(8): C22C38/14C21D7/13C21D6/00
Inventor 万兰凤韩乃川冷祥贵吴浩方
Owner 宝钢集团上海梅山有限公司
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