thick hot rolled sheet steel with 450MPa grade yield strength and manufacturing method thereof

A technology of hot-rolled steel sheet and yield strength, applied in the field of hot-rolled steel sheet with a yield strength of 450MPa thick specification and its manufacturing field, can solve the problems of increased cost and increased energy consumption of hot-rolling equipment, and achieves reduction of alloy cost, improvement of elongation, The effect of reducing usage

Inactive Publication Date: 2016-06-22
SHANGHAI MEISHAN IRON & STEEL CO LTD
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Problems solved by technology

[0006] The purpose of the present invention is to provide a thick gauge hot-rolled steel plate with a yield strength of 450MPa and its manufacturing method, which solves the problem of adding precious alloy elements in the existing hot-rolled steel plate with a yield strength of 450MPa grade, which causes the cost increase and the energy consumption of hot rolling equipment. Added technical issues

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  • thick hot rolled sheet steel with 450MPa grade yield strength and manufacturing method thereof
  • thick hot rolled sheet steel with 450MPa grade yield strength and manufacturing method thereof
  • thick hot rolled sheet steel with 450MPa grade yield strength and manufacturing method thereof

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Embodiment Construction

[0035] The present invention will be further described below in conjunction with Examples 1-4.

[0036] Table 1 Chemical composition of the present invention (% by weight), the balance is Fe and unavoidable impurities.

[0037]

[0038] According to the requirements of the material composition design of the present invention, pre-desulfurization of molten iron is adopted, top-bottom combined blowing of converter, Ar blowing station (or LF furnace) ensures bottom blowing Ar, continuous casting is blown Ar for protection casting, and casting into continuous casting slab.

[0039] After the continuous casting slab is reheated by the heating furnace, it is rolled on a fully continuous hot rolling mill. The process control parameters are shown in Table 2. First, rough rolling is carried out through the rough rolling mill. , the intermediate billet is curled by the hot coil box and then unfolded for finish rolling. After controlled rolling by the finish rolling tandem rolling u...

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Abstract

The invention relates to a thick hot rolled sheet steel with 450MPa grade yield strength and a manufacturing method thereof, and solves the technical problems of cost increase and hot rolling equipment energy consumption increase due to adding of precious alloy elements in existing 450MPa grade yield strength thick hot rolled sheet steel. The thick hot rolled sheet steel with 450MPa grade yield strength provided by the invention comprises the following chemical components by weight percentage: 0.11%-0.16% of C, 0.15%-0.25% of Si, 1.0%-.3% of Mn, less than or equal to 0.018% of P, less than or equal to 0.008% of S, 0.020%-0.035% of Nb, 0.015%-0.025% of Ti, 0.010%-0.050% of Alt, 0.0015%-0.0040% of Ca, and the balance iron and unavoidable inclusions. The product involved in the invention can be used for construction, ocean engineering, engineering machinery and other industries.

Description

technical field [0001] The invention relates to a thick-gauge hot-rolled steel plate, in particular to a thick-gauge hot-rolled steel plate with a yield strength of 450 MPa and a manufacturing method thereof. Background technique [0002] At present, for structural steels with a tensile strength of 500MPa-550MPa, the strengthening methods include fine-grain strengthening, solid-solution strengthening, and precipitation strengthening, and fine-grain strengthening is the only means to simultaneously improve strength and toughness. Therefore, under the conditions of rolling energy consumption and equipment capacity, grain refinement is the basis for strengthening and toughening materials. Secondly, it is necessary to achieve further solid solution and precipitation strengthening by adding alloying elements, but on the one hand, this increases the alloy cost of the steel, and at the same time inevitably leads to a decrease in material toughness and deterioration of welding perfo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C22C33/04C21D8/02
Inventor 胡恒法郭园园王慧娟裴新华王运起
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD
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