Low-cost steel plate for building structure and manufacturing method thereof
A low-cost technology for building structures, applied in the manufacture of converters, furnace types, furnaces, etc., can solve the problems of high production process cost, high alloy cost, high P content, and achieve laminar tear resistance and good, strong and toughness. Good, low-cost results
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Embodiment 1
[0033] The actual composition of the steel plate of the present invention (percentage by weight): C 0.15%, Si 0.38%, Mn 1.36%, P 0.010%, S 0.003%, Alt 0.036%, carbon equivalent Ceq is 0.38%, and the balance is Fe and unavoidable sandwich. Rolled into a steel plate with a thickness of 80mm, the properties of the steel plate: yield strength 370Mpa, tensile strength 525Mpa, yield ratio 0.70, elongation 30.5%, -40°C longitudinal impact energy (AKV) 119J, 94J, 132J, Z-direction reduction of area 55.0 %, 52.0%, 59.5%.
[0034] Production method of the present invention is as follows:
[0035](1) Hot metal pretreatment: hot metal S 0.035% before desulfurization, Si≤0.42%, and hot metal S after desulfurization 0.004%.
[0036] (2) Smelting process: The molten iron is smelted in a converter, and 300kg of Al iron / furnace is added when the steel is tapped, and then sent to the LF refining furnace for desulfurization and deoxidation treatment, and then RH vacuum treatment, the vacuum ti...
Embodiment 2
[0042] The actual composition (percentage by weight) of the steel plate of the present invention: C 0.17%, Si0.36%, Mn 1.40%, P 0.009%, S 0.002%, Alt 0.042%, carbon equivalent Ceq is 0.41%, and the balance is Fe and Inevitable interstitial. Rolled into a thick 36mm steel plate, its steel plate properties: yield strength 415Mpa, tensile strength 545Mpa, yield strength ratio 0.76, elongation 29.0%, -40 ℃ longitudinal impact energy (AKV) is 125J, 104J, 144J, Z-direction reduction of area 61.0%, 57.0%, and 60.5%.
[0043] Production method of the present invention is as follows:
[0044] (1) Hot metal pretreatment: hot metal S 0.035% before desulfurization, Si≤0.44%, and hot metal S after desulfurization 0.0046%.
[0045] (2) Smelting process: Smelt the molten iron in a converter, add 290kg of Al iron / furnace when tapping the steel, then send it to the LF refining furnace for desulfurization and deoxidation treatment, and then perform RH vacuum treatment, the vacuum time is 14 m...
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