Hot rolled steel plate with yield strength of 450 MPa, and making method of hot rolled steel plate

A technology of hot-rolled steel sheet and yield strength, applied in the field of hot-rolled steel sheet with yield strength of 450MPa and its manufacturing field, can solve the problem of high production cost, and achieve the effects of reducing alloy cost, reducing alloy use, and excellent strong plasticity.

Inactive Publication Date: 2016-12-21
SHANGHAI MEISHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0007] The purpose of the present invention is to provide a 450MPa yield strength hot-rolled steel plate and its manufacturing method to solve the technical problem of high production cost of the existing 450MPa yield strength hot-rolled steel plate

Method used

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  • Hot rolled steel plate with yield strength of 450 MPa, and making method of hot rolled steel plate
  • Hot rolled steel plate with yield strength of 450 MPa, and making method of hot rolled steel plate
  • Hot rolled steel plate with yield strength of 450 MPa, and making method of hot rolled steel plate

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Embodiment Construction

[0039] Below in conjunction with embodiment 1~4, the present invention is further described, as shown in table 1~table 3.

[0040] Table 1 Chemical composition of the present invention (mass percentage %), the balance is Fe and unavoidable impurities.

[0041]

[0042] According to the design requirements of the material composition of the present invention, pre-desulfurization of molten iron is adopted, top-bottom compound blowing of converter, LF blowing Ar treatment, RH furnace performs composition fine-tuning, vacuum circulation degassing treatment, and at the same time feeds an appropriate amount of calcium wire for calcium treatment, continuous casting Low-carbon steel mold slag is used, and Ar protection casting is blown throughout the process, and cast into continuous casting slabs.

[0043] After the continuous casting slab is reheated by the heating furnace, it is rolled on the hot tandem rolling mill. To produce qualified hot-rolled coils, the thickness of the f...

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Abstract

The invention relates to a hot rolled steel plate with the yield strength of 450 MPa, and a making method of the hot rolled steel plate to solve the technical field of high production cost of present hot rolled steel plates with the yield strength of 450 MPa. The hot rolled steel plate with the yield strength of 450 MPa comprises, by mass, 0.04-0.08% of C, 0.10-0.40% of Si, 1.20-1.50% of Mn, 0.02% or less of P, 0.01% or less of S, 0.0060% or less of N, 0.015-0.040% of Al, 0.04-0.06% of Ti, and the balance of iron and inevitable inclusions, the structure of the steel plate is ferrite and an extremely small amount of pearlite, the yield strength of the hot rolled steel plate is not less than 450 MPa, the tensile strength is not less than 590 MPa, and the elongation after fracture is not less than 20%. The hot rolled steel plate can be used in the fields of engineering machines, automobiles, railways and containers.

Description

technical field [0001] The invention relates to a hot-rolled high-strength steel plate, in particular to a hot-rolled steel plate with a yield strength of 450MPa and a manufacturing method thereof. Background technique [0002] Hot-rolled steel sheets for low-alloy structures are the most widely used and most used steel materials in strip products. They are mainly used in automobile structures, engineering machinery, building structures and other general structural parts. Low-alloy structural steels are generally added with Nb, V, Ti and other micro-alloying elements can produce hot-rolled steel sheets with better strength and toughness through appropriate hot-rolling controlled rolling and controlled cooling processes. [0003] Chinese patent application number 201210415974.7 discloses a steel with a yield strength of 450MPa for railway wagon parts and its production method. It is based on C-Mn, and controls the carbon equivalent Ceq≤0.42%. With a matching process, the obta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C21D8/02
Inventor 段争涛裴新华凌爱兵
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD
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