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Hot continuous rolling plate strip steel for 510MPa automotive frame and production technology thereof

An automobile beam and production process technology, applied in the field of steel rolling, can solve the problems of lack of in-depth research, low smelting cost and high production cost, and achieve the effects of high cost performance, lower production cost and lower cost.

Inactive Publication Date: 2013-12-18
JIGANG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Publication No. CN102212747A discloses a low-cost automobile frame steel and its manufacturing method. The frame steel and its manufacturing method still belong to the production process of low-carbon high-manganese-niobium microalloyed frame steel. The manufacturing method focuses on optimizing the process route. The RH treatment cycle is reduced, and the cost of smelting is slightly lower than that of LF. There is no in-depth study on the role of rolling process in reducing cost and improving performance, and its production cost is still high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The molten iron has undergone KR desulfurization treatment and conventional converter smelting process to control the content of carbon, phosphorus, manganese and silicon at the end of the molten steel. After LF treatment, feed calcium wire to denature the inclusions and control the soft blowing time for not less than 10 minutes. Casting, slab smelting composition: 0.13%C, 0.46%Si, 0.89%Mn, 0.03Alt, 0.017%P, 0.005%S, 0.013%Ti, 0.0042%N, the balance is Fe and unavoidable impurities, casting The billet thickness is 135mm, and the cast billet is rolled to produce 510MPa grade hot-rolled strip steel for automobile frame;

[0025]The rolling process is as follows: heat the slab to 1220°C, the heating time is 2 hours, the finish rolling entrance temperature is 1040°C, the finish rolling temperature is 860°C, water cooling starts after 1.5S after the finish rolling, at 80-90°C / S The speed is cooled to about 660°C, and then cooled to 480°C at a speed of 25-30°C / S for coiling. T...

Embodiment 2

[0027] The molten iron has undergone KR desulfurization treatment and conventional converter smelting process to control the content of carbon, phosphorus, manganese and silicon at the end of the molten steel. After LF treatment, feed calcium wire to denature the inclusions and control the soft blowing time for not less than 10 minutes. Casting, slab smelting composition: 0.15%C, 0.36%Si, 0.87%Mn, 0.04Alt, 0.014%P, 0.006%S, 0.017%Ti, 0.0028%N, the balance is Fe and unavoidable impurities, casting The billet thickness is 135mm, and the cast billet is rolled to produce 510MPa grade hot-rolled strip steel for automobile frame;

[0028] The rolling process is as follows: heat the slab to 1180°C, the heating time is 2.5 hours, the finish rolling entrance temperature is 1020°C, the finish rolling temperature is 850°C, water cooling starts after 2S after the finish rolling, and the temperature is 70-80°C / S The speed is cooled to about 670°C, and then cooled to 530°C at a speed of 20-...

Embodiment 3

[0030] Hot metal KR desulfurization, converter smelting, LF treatment, continuous casting, slab smelting composition: 0.17%C, 0.38%Si, 0.96%Mn, 0.03Alt, 0.013%P, 0.003%S, 0.014%Ti, 0.0032%N, The balance is Fe and unavoidable impurities. The thickness of the slab is 135mm, and the slab is rolled to obtain a 510MPa grade hot-rolled strip steel for automobile beams;

[0031] The rolling process is as follows: heat the slab to 1200°C, the heating time is 2.5 hours, the finish rolling entrance temperature is 1000°C, the finish rolling temperature is 840°C, water cooling starts after 2S after the finish rolling, and the temperature is 60-70°C / S The speed is cooled to about 650°C, and then cooled to 570°C at a speed of 15-20°C / S for coiling. The thickness of the strip is 6.0mm, the yield strength is 425MPa, the tensile strength is 560MPa, and the elongation is 28.5%.

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Abstract

The invention belongs to the technical field of steel rolling, and particularly relates to a low cost hot continuous rolling plate strip steel for a 510MPa automotive frame and a production technology thereof. The hot continuous rolling plate strip steel for the automotive frame comprises the following components by weight percent: 0.13-0.18% of C, 0.30-0.50% of Si, 0.75-1.15% of Mn, 0.02-0.06% of Alt, less than or equal to 0.025% of P, less than or equal to 0.008% of S, 0.008-0.025% of Ti, less than or equal to 0.006% of N, the balance of Fe, and inevitable impurities. According to the production technology, by slightly adjusting the content of C and Si, lowering the content of Mn, only adding a small quantity of cheap Ti, and adding no other precious alloy elements, the production cost is remarkably lowered, the production quantity of the type of steel is reduced, the energy is saved, the consumption is lowered, the cost is lowered, and an automotive frame steel with excellent comprehensive properties is obtained, so that the production technology can provide products with high cost performance for the auto industry.

Description

technical field [0001] The invention belongs to the technical field of steel rolling, and relates to a production process of hot-rolled sheet and strip steel, in particular to a low-cost 510MPa-grade hot-rolled sheet-strip steel for automobile frame and its production process. The 510MPa-grade automobile frame of the present invention is Steel plates and strips are suitable for the production and manufacture of heavy, medium and light trucks and agricultural vehicles and other girders. Background technique [0002] In recent years, with the rapid development of the modern automobile industry, energy shortages and environmental pressures are increasing, coupled with the continuous improvement of global environmental protection legislation, the development of automobile technology has been promoted to focus on energy conservation, environmental protection and safety. In 2012, China's automobile output has exceeded 19 million, and it has maintained its position as the world's l...

Claims

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Application Information

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IPC IPC(8): C22C38/14B21B37/74
Inventor 宋振官孙风晓陈福山魏代斌王勇赵登报鞠传华胡宝印王克柱侯续廷
Owner JIGANG GRP
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