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Thick steel plate for ocean platform structure with yield strength of 500MPa grade and manufacture method thereof

An offshore platform, yield strength technology, applied in the direction of manufacturing tools, metal rolling, metal rolling, etc., to achieve the effect of improving the uneven microstructure in the thickness direction, high strength and high toughness, and improving low temperature impact toughness

Inactive Publication Date: 2012-11-14
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Aiming at the problems existing in the prior art, in order to solve the production problem of the steel plate for the structure of the offshore platform with a thick specification, the present invention provides a thick steel plate for the structure of the offshore platform with a yield strength of 500MPa and its manufacturing method

Method used

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  • Thick steel plate for ocean platform structure with yield strength of 500MPa grade and manufacture method thereof
  • Thick steel plate for ocean platform structure with yield strength of 500MPa grade and manufacture method thereof
  • Thick steel plate for ocean platform structure with yield strength of 500MPa grade and manufacture method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The chemical composition of thick steel plates for offshore platform structures is: C: 0.07wt%, Si: 0.32wt%, Mn: 1.5wt%, P: ≤0.006wt%, S: ≤0.002wt%, Al: 0.03wt% %, Cr: 0.20wt%, Ni: 0.60wt%, Cu: 0.21wt%, Mo: 0.18wt%, V: 0.032wt%, Ti: 0.015wt%, Nb: 0.07wt%, and the balance is Fe.

[0032]The manufacturing method of the steel plate is as follows: C, Si, Mn, P, S, Al, Nb, V, Ti, Cu, Cr, Ni, Mo and Fe are used as raw materials, smelted, and continuously cast into billets, and the billets are heated to After 1180°C, two-stage rolling is carried out, and after rolling, two-phase zone quenching and high-temperature tempering heat treatment are carried out to obtain thick plates with a yield strength of 500MPa for offshore platform structures.

[0033] The above two-stage rolling, that is, two-stage controlled rolling in the austenite recrystallization zone and non-recrystallization zone, the starting temperature of the rough rolling stage is 1080°C, the finishing temperature of...

Embodiment 2

[0037] The chemical composition of thick steel plates for offshore platform structures is: C: 0.09wt%, Si: 0.38wt%, Mn: 1.8wt%, P: ≤0.006wt%, S: ≤0.002wt%, Al: 0.04wt% %, Cr: 0.25wt%, Ni: 1.0wt%, Cu: 0.25wt%, Mo: 0.20wt%, V: 0.040wt%, Ti: 0.01wt%, Nb: 0.06wt%, and the balance is Fe.

[0038] The manufacturing method of the steel plate of the present invention is: take C, Si, Mn, P, S, Al, Nb, V, Ti, Cu, Cr, Ni, Mo and Fe as raw materials, through smelting, and continuous casting into billets, the billets After heating to 1210°C, two-stage rolling is carried out, and after rolling, two-phase zone quenching and high-temperature tempering heat treatment are carried out to obtain thick plates with a yield strength of 500MPa for offshore platform structures.

[0039] The above two-stage rolling, that is, two-stage controlled rolling in the austenite recrystallization zone and non-recrystallization zone, the starting temperature of the rough rolling stage is 1100°C, the finishing te...

Embodiment 3

[0043] The chemical composition of thick steel plates for offshore platform structures is: C: 0.05wt%, Si: 0.25wt%, Mn: 1.3wt%, P: ≤0.006wt%, S: ≤0.002wt%, Al: 0.02wt% %, Cr: 0.15wt%, Ni: 0.20wt%, Cu: 0.18wt%, Mo: 0.15wt%, V: 0.025wt%, Ti: 0.02wt%, Nb: 0.08wt%, and the balance is Fe.

[0044] The manufacturing method of the steel plate of the present invention is: take C, Si, Mn, P, S, Al, Nb, V, Ti, Cu, Cr, Ni, Mo and Fe as raw materials, through smelting, and continuous casting into billets, the billets After heating to 1150°C, two-stage rolling is carried out, and after rolling, two-phase zone quenching and high-temperature tempering heat treatment are carried out to obtain thick plates with a yield strength of 500MPa for offshore platform structures.

[0045] The above-mentioned two-stage rolling, that is, two-stage controlled rolling is carried out in the austenite recrystallization zone and the non-recrystallization zone. The reduction is controlled at 20%, and air cool...

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Abstract

The invention relates to a thick steel plate for an ocean platform structure with yield strength of 500MPa grade and a manufacture method thereof, belonging to the technical field of steel rolling. The steel plate contains the following chemical components in percent by mass: 0.05-0.09 percent of C, 0.25-0.38 percent of Si, 1.3-1.8 percent of Mn, no more than 0.006 percent of P, no more than 0.002 percent of S, 0.02-0.04 percent of Al, 0.15-0.25 percent of Cr, 0.2-1.0 percent of Ni, 0.18-0.25 percent of Cu, 0.15-0.20 percent of Mo, 0.025-0.040 percent of V, 0.01-0.02 percent of Ti, 0.06-0.08 percent of Nb and the balance of Fe. The manufacture method comprises the following steps of: smelting raw materials; continuously casting to form a blank; heating the blank; carrying out two-stage controlled rolling on a recrystallization region and an unrecrystallization region of an austenite; and then quenching at the two phase regions and carrying out high-temperature tempering thermal treatment after the rolling. The problem of nonuniform microscopic structures in the thick direction of the steel plate can be remarkably improved, and the steel plate has better low-temperature impact toughness.

Description

technical field [0001] The invention belongs to the technical field of steel rolling, in particular to a method for manufacturing a thick steel plate for offshore platform structures with a yield strength of 500 MPa. Background technique [0002] Shipbuilding steel generally refers to the steel used to manufacture hull structures produced in accordance with the requirements of the classification society's construction specifications. At present, several major iron and steel enterprises in my country have production, and can produce marine steel according to user needs in different countries. The steel used for hull structure is divided into strength grades according to its minimum yield point: general-strength structural steel and high-strength structural steel. The general-strength structural steels in the standards of China Classification Society are divided into four quality grades: A, B, D, and E; the high-strength structural steels in the standards of China Classificati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/58C22C38/50B21B37/00C21D1/18
Inventor 刘振宇周砚磊王国栋
Owner NORTHEASTERN UNIV LIAONING