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Steel for 300MPa-grade automobile structural part and production method for steel
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A technology for structural parts and automobiles, applied in the field of 300MPa grade automobile structural parts steel and its production, can solve the problems of high Mn content, reduced production efficiency, increased welding difficulty, etc., achieve high strength and stable mechanical properties, and shorten the production process. , the effect of improving the yield
Active Publication Date: 2014-05-14
武汉钢铁有限公司
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Its disadvantages are: due to the content of 0.01~0.04% Ti, and Ti is easy to oxidize, it is necessary to increase the RH vacuum treatment process during steelmaking, resulting in high energy consumption, reduced production efficiency, and low yield of Ti
In addition, due to the high content of Mn, the difficulty of welding increases
In addition, the Si content is also high, which makes it easy to form Mn on the surface of the steel plate. 2 SiO 4 Oxide, unfavorable galvanizing performance, prone to dezincification
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[0037] The present invention is described in detail below:
[0038] Table 1 is a list of chemical components and weight percentage contents of each embodiment of the present invention and comparative examples.
[0039] Table 2 is the main process parameter list of each embodiment of the present invention and comparative example, and it carries out according to following process step:
[0040] 1) Carry out desulfurization of molten iron, and control S in molten iron to ≤0.006%;
[0041] 2) Converter smelting;
[0042] 3) Carry out argon blowing on the ladle, the blowing time is 5-10 minutes, and the argon flow rate is 4-5 cubic decimeters / second;
[0043] 4) Carry out continuous casting and control the pouring temperature at 1540-1550°C;
[0044] 5) Heating the slab, the heating temperature is controlled at 1200-1250°C;
[0045] 6) Carry out hot rolling, control the starting rolling temperature at 1135-1140°C, and control the finishing rolling temperature at 917-925°C;
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Abstract
The invention relates to steel for a 300MPa-grade automobile structural part and a production method for the steel. The steel comprises the following main components in percentage by weight: 0.06-0.08 percent of C, 0.05-0.09 percent of Si, 0.30-0.45 percent of Mn, 0.025-0.055 percent of Al, 0.015-0.025 percent of P, less than or equal to 0.006 percent of S, 0.010-0.019 percent of Nb, less than or equal to 0.006 percent of N and the balance of Fe and impurities. The production method comprises the production steps of molten iron desulfurization, converter smelting, ladle argon blowing, continuous casting, heating of a casting blank, hot rolling, winding, conventional pickling, cold rolling, continuous operation and flattening for later use. The production method disclosed by the invention has the advantages of short process flow, lower energy consumption and stable mechanical property; and in addition, on the premise that the yield strength of 300-340MPa and the tensile strength of 390-445MPa are met, the elongation percentage is not lower than 31 percent, the plastic strain ratio r is 1.45-1.80, a strain hardening index n is 0.16-0.20, a wide-cold test bending is 180 degrees and a bending diameter d is equal to 0; and in a metallographic structure, an equiaxed ferrite is 85-90 percent and a granular pearlite is 10-15 percent.
Description
technical field [0001] The invention relates to a steel material for automobiles and a production method thereof, in particular to a steel for 300MPa grade automobile structural parts and a production method thereof. Background technique [0002] 300MPa grade micro-alloyed steel is widely used in the automobile, especially the car manufacturing industry because of its appropriate strength and plasticity, good formability and weldability, and the amount used for each vehicle reaches 40-60 kg. [0003] After searching, the Chinese patent (ZL99111533.3) disclosed "A Method for Manufacturing Low Carbon Microalloyed Steel", and its chemical composition (wt %) is C: 0.04~0.11, Si: 0.1~0.3, Mn: 1.0~1.5 , P: 0.001~0.015, S: 0.001~0.01, Al: 0.001~0.05, Nb: 0.03~0.06, Ti: 0.01~0.04, and the balance is Fe. Its disadvantages are: since Ti contains 0.01-0.04%, and Ti is easy to oxidize, it is necessary to increase the RH vacuum treatment process during steelmaking, resulting in high ene...
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