Sheet steel with tensile strength of 1500 MPa levels and used for hot stamping forming and cast steel plate (CSP) production method thereof
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A technology of hot stamping and tensile strength, applied in the field of ultra-high-strength hot-forming steel, can solve the problems of high price of the final thin steel plate product, achieve the suppression of austenite grain growth, and reduce repeated uncoiling and coiling , the effect of refining the austenite grain size
Active Publication Date: 2016-03-30
武汉钢铁有限公司
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In the above-mentioned production process, raw materials need to undergo uncoiling and coiling, heating and cooling treatment repeatedly in hot rolling, cold rolling, annealing treatment and other processes. The production cost of repeated processes will inevitably lead to high prices of the final thin steel plate products produced.
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[0025] The present invention will be described in detail below in conjunction with accompanying drawing:
[0026] Table 1 is a list of chemical components and weight percentage values of each embodiment of the present invention;
[0027] Table 2 is the list of main process parameters of each embodiment of the present invention;
[0028] Table 3 is a list of experimental results of mechanical properties of each embodiment of the present invention after quenching treatment.
[0029] The process route of the present invention includes: molten steel smelting, vertical curved CSP thin slab continuous casting, descaling, roller hearth tunnel furnace soaking, TMCP six-stand hot continuous rolling, laminar cooling, coiling, decoiling pickling, leveling , Rolling into storage.
[0030] Each embodiment of the present invention is produced according to the following steps:
[0031] 1) Molten steel smelting: using converter smelting and LF furnace refining;
[0032] 2) CSP thin slab...
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Abstract
The invention discloses sheet steel with the tensile strength of 1500 MPa levels and used for hot stamping forming and a cast steel plate (CSP) production method thereof. The sheet steel comprises, by weight, 0.20-0.25% of C, 0.25-0.40% of Si, 1.00-1.30% of Mn, 0-0.025% of P, 0-0.01% of S, 0.015-0.035% of Als, 0-0.005% of N, 0-0.005% of B, 0.020-0.060% of Nb, 0.010-0.040% of Ti, and the balance Fe and inevitable microelements. According to the sheet steel with the tensile strength of 1500 MPa levels and used for hot stamping forming and the cast steel plate (CSP) production method thereof, the process steps comprises molten steel smelting, vertical bending type CSP sheet blank continuous casting, descaling, roller bottom type tunnel furnace soaking, thermal mechanical control processing (TMCP) six machine frame hot continuous rolling, laminar cooling, reeling, unreeling pickling, flattening and reeling; sheet material cold rolling and annealing heat treatment are omitted, and a traditional cold-rolled sheet product is replaced by a hot rolled sheet product; the comprehensive production cost is reduced, and the cost of the steel per ton can be reduced by over 600 yuan.
Description
technical field [0001] The invention belongs to the technical field of steel for ultra-high strength hot forming in the metallurgical industry, and in particular relates to a thin steel plate for hot stamping forming with a tensile strength of 1500 MPa and a CSP production method thereof. Background technique [0002] With the increasing environmental problems, automobile lightweight has become the core issue in today's automobile manufacturing field. The use of high-strength steel for lightweight design of automobile bodies is the best way to meet the needs of automobile lightweight and improve collision safety. However, for ultra-high-strength steel above 1000MPa, iron and steel companies must use specialized ultra-high-strength steel equipment for production; at the same time, automobile companies have technical problems such as difficult control of stamping springback and poor dimensional accuracy. [0003] The birth of hot stamping forming technology has solved the abo...
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