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Production method of ultra-thick low-alloy steel plate

A technology of alloy steel plate and production method, which is applied in the field of iron and steel smelting, can solve the problems of difficult production, harsh use environment, and high requirements for assembly conditions, and achieve the effect of good plate shape, large margin, and uniform impact performance

Inactive Publication Date: 2016-01-20
HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The thickness of extra-thick low-alloy steel plates used for wind turbine bases is usually more than 250mm. The use environment is harsh and the assembly conditions are high. The requirements for steel plate flaw detection, performance and plate shape roughness are very high, and production is difficult.

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  • Production method of ultra-thick low-alloy steel plate

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Embodiment Construction

[0017] Below in conjunction with embodiment further illustrate content of the present invention.

[0018] Production of ultra-thick low-alloy steel plates for foundations of wind power facilities with a thickness of 250 mm to ensure performance, flaw detection and plate shape. The chemical composition mass percentage of the steel plate (unit wt%): C=0.12~0.18, Si=0.20~0.50, Mn= 1.30~1.60, P≤0.015, S≤0.005, Als≤0.020~0.050, Nb=0.02~0.04, V=0.02~0.05, Ti=0.01~0.02, and the rest are Fe and residual elements. Including the following process steps:

[0019] a. Converter smelting: C ≥ 0.05%, P ≤ 0.015% when tapping, tapping temperature ≥ 1600°C; the number of spot blowing should not exceed 2 times to avoid slag during tapping;

[0020] b. LF refining: use a large amount of slag to make slag, and ensure that the retention time of white slag is controlled above 15 minutes;

[0021] c. Vacuum refining: pressure holding time ≥ 20min under the pressure of ≤ 67Pa;

[0022] d. Casting: ...

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Abstract

The invention discloses a production method of an ultra-thick low-alloy steel plate. The process route adopted in the production method comprises smelting with a converter, LF refining, vacuum refining, mold casting, heating, rolling, slow cooling, heat treatment and shape correction. The ultra-thick low-alloy steel plate comprises the following chemical components in percentage by weight: 0.12-0.18% of C, 0.20-0.50% of Si, 1.30-1.60% of Mn, P of which the percentage is smaller than or equal to 0.015%, S of which the percentage is smaller than or equal to 0.005%, Als of which the percentage is smaller than or equal to 0.020-0.050%, 0.02-0.04% of Nb, 0.02-0.05% of V, 0.01-0.02% of Ti, and the balance being Fe and residual elements. According to the production method disclosed by the invention, a large-section cast ingot is adopted; in the aspect of component selection, a low-cost chemical component design only employing alloys of Nb, V and Ti is adopted; through an LF technology and a VD technology, the cleanliness of the steel plate is guaranteed; through controlled rolling and normalizing treatment, the grain size of steel can reach above 7.0 grade. The produced ultra-thick low-alloy steel plate has the characteristics that the thickness is 250mm; the crack detection property, the mechanical property and the plate shape can be guaranteed; the yield strength margin is 20-40Mpa; the tensile strength margin is 20-30Mpa; the elongation rate margin is 6%-9%; the impact resistance is uniform; the produced steel plate is particularly suitable for bases of wind driven generators.

Description

technical field [0001] The invention belongs to iron and steel smelting technology, and in particular relates to a production method of an extra-thick low-alloy steel plate. technical background [0002] The thickness of the extra-thick low-alloy steel plate used for the base of the wind turbine is usually more than 250mm. The use environment is harsh and the assembly conditions are high. The requirements for the flaw detection, performance and unevenness of the plate are very high, and the production is difficult. Contents of the invention [0003] The object of the present invention is to provide a production method for producing extra-thick low-alloy steel plates with a thickness of more than 250mm, ensuring performance, flaw detection and plate shape. [0004] Invented technical solution: [0005] A production method of an extra-thick low-alloy steel plate adopts a process route of converter smelting, LF refining, vacuum refining, mold casting, heating, rolling, slow ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/04C22C38/14
Inventor 杨文志陈本强王超徐琛龙渊龙安辉
Owner HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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