Ultrahigh-strength steel hot-rolled base plate and manufacturing method thereof
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A technology of ultra-high-strength steel and substrate, which is applied in the direction of improving process efficiency, etc., can solve the problems of not having the production capacity of ultra-high-strength steel substrate, and achieve the effect of good plate shape, uniform structure and high production efficiency
Active Publication Date: 2018-09-14
MAANSHAN IRON & STEEL CO LTD
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Problems solved by technology
However, at present, the steel coil mill and the wide and heavy plate mill do not have the production capacity of this type of ultra-high-strength steel substrate
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Embodiment 1
[0050] A hot-rolled base plate of ultra-high-strength steel, containing the following chemical composition in weight percentage:
[0051] Carbon 0.163%, Silicon 0.28%, Manganese 1.22%, Phosphorus 0.005%, Sulfur 0.007%, Niobium 0.023%, Titanium: 0.015%, Aluminum 0.034%, Molybdenum 0.56%, Vanadium 0.04%, Nickel 0.06%, Chromium 0.35%, Copper : 0.03%, calcium: 0.0010-0.0050%, boron: 0.0016%, nitrogen: 0.003%, oxygen: 0.0006%, hydrogen: 0.00016%, and the balance is iron and unavoidable impurities.
[0052] After smelting in a 300-ton converter, blowing argon in the ladle, refining in the LF furnace, continuous casting, and reheating, it enters the rough rolling of the two stands R1 and R2, and then goes through the production line of the 7-stand 2250 continuous rolling unit for thermomechanical controlled rolling and hot rolling. The thickness specification is 5mm.
[0053] The preparation method of the above ultra-high-strength steel hot-rolled substrate, the steps are:
[0054]...
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Abstract
The invention provides an ultrahigh-strength steel hot-rolled base plate and a manufacturing method thereof. The designed ultrahigh-strength steel base plate has strict requirements for chemical components, the plate shape and the like, and thus, the four links of component design, smelting, rolling and plate cutting are strictly controlled. Firstly, the contents of C, Si, Mn, P, S, Mo, V, Cr, Ni,Cu, Nb and B are properly controlled; secondly, a continuous rolling method, a cooling process, a comprehensive, microalloying method, a solution strengthening method, a tissue strengthening method and the like are design to obtain a uniform complex-phase tissue containing ferrite, nodular troostite and a small quantity of bainite, and meanwhile, the dimension precision, surface quality and plateshape of a hot-rolled plate coil are controlled; thirdly, the content of S and the content of P are minimized through ultra-pure smelting, so that the tenacity is improved by reducing the inclusion of manganese sulfide; fourthly, an LF and RH duplex process is adopted to strictly control the content of H in steel; and fifthly, the internal quality of a steel billet is strictly controlled though electromagnetic stirring and slight pressing processes.
Description
technical field [0001] The invention belongs to the field of low-alloy controlled-rolling and controlled-cooling steel, and in particular relates to a super-high-strength steel hot-rolled substrate and a preparation method thereof. Background technique [0002] With the development of technology, the demand for lightweight requires steel plates to have higher strength and thinner thickness. Ultra-high-strength steel plates with a thickness of 6mm, 5mm, 4mm or even 3mm appear on the market. [0003] For the current ultra-high-strength steel above 960MPa, the hot-rolled substrate is generally rolled by a steel plate rolling mill or a wide and heavy plate rolling mill, and then off-line quenching + tempering treatment. Due to the production of single-sheet rolling or steckel rolling mill, the thickness accuracy is not high (for example, GB / T709 specifies -0.6mm-+0.6mm for single-sheet rolling steel plate N with a thickness of 5-8mm and a width of 1500mm-2000mm), It is difficul...
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