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Large thickness quenched high strength steel and production method thereof

A high-strength steel plate and production method technology, applied in the direction of rolling mill control devices, metal rolling, manufacturing tools, etc., can solve the problems of unable to meet the market demand for thick plates and narrow specification ranges, and reduce the cost and strength of steel plate leveling The effect of high grade and low precious metal content

Inactive Publication Date: 2009-02-11
WUYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some domestic steel manufacturers produce steel plates of this strength level, and the specification range is generally narrow, all below 60mm, which cannot meet the growing market demand for thick plates

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A large-thickness quenched and tempered high-strength steel plate, composed of the following chemical components in weight percentage: C 0.16%, Si 0.22%, Mn 1.03%, Ni 1.18%, Cr 1.13%, Mo 0.52%, V 0.053% , Al0.028%, B 0.0013%, Nb 0.033%, P 0.011%, S 0.003%, the balance is Fe and unavoidable inclusions. Ceq is 0.75%, rolled into 114mm steel plate.

[0037] The production method of the steel plate is as follows:

[0038] (1) Smelting process: The molten steel designed with this composition is smelted in an ultra-high-power electric arc furnace. During the melting period, a large amount of slag is used to flow the slag, and it is sent to the LF refining furnace for refining, and fed to an Al wire of 700m. Including VD furnace vacuum treatment, add 140kg of SiCa block before vacuum, vacuum degree 0.7 Torr, break the vacuum when the vacuum is kept for 20min, solve the phenomenon that the molten steel is deoxidized by Al line alone, and the content of non-metallic inclusions in...

Embodiment 2

[0046] A large-thickness quenched and tempered high-strength steel plate, composed of the following chemical components in weight percentage: C 0.15%, Si 0.40%, Mn 1.1%, Ni 0.7%, Cr 1.2%, Mo 0.60%, V 0.05% , Al 0.040%, B 0.002%, Nb 0.02%, P 0.025%, S 0.02%, the balance is Fe and unavoidable inclusions. Ceq is 0.75%, rolled into 112mm steel plate.

[0047] The production method of the steel plate is as follows:

[0048] (1) Smelting process: The molten steel designed with this composition is smelted in an ultra-high-power electric arc furnace. During the melting period, a large amount of slag is used to flow the slag. It is sent to the LF refining furnace for refining, and fed with an Al wire of 800m. Including VD furnace vacuum treatment, add SiCa block 150kg before vacuum, vacuum degree 1.0 Torr, and break the vacuum when the vacuum is kept for 15 minutes, which solves the phenomenon that the molten steel is deoxidized by Al line alone and the content of non-metallic inclusi...

Embodiment 3

[0056] A large-thickness quenched and tempered high-strength steel plate, composed of the following chemical components in weight percentage: C 0.18%, Si 0.10%, Mn 1.2%, Ni 1.15%, Cr 1.00%, Mo 0.40%, V 0.03% , Al 0.020%, B 0.0005%, Nb 0.04%, P 0.015%, S 0.006%, and the balance is Fe and unavoidable inclusions. Ceq is 0.74%, rolled into 108mm steel plate.

[0057] The production method of the steel plate is as follows:

[0058] (1) Smelting process: The molten steel designed with this composition is smelted in an ultra-high-power electric arc furnace. During the melting period, a large amount of slag is used to flow the slag. It is sent to the LF refining furnace for refining, and fed to an Al wire of 600m. Including VD furnace vacuum treatment, add 100kg of SiCa block before vacuum, vacuum degree 0.6 Torr, break the vacuum when the vacuum is kept for 18min, solve the phenomenon that the molten steel is deoxidized by Al line alone, and the content of non-metallic inclusions in...

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Abstract

The invention belongs to the field of metal materials and discloses a large-thickness and high-strength quenched and tempered steel plate and a production method thereof. The steel plate mainly consists of the following chemical components by weight percentages: not more than 0.18% of C, 0.1-0.4% of Si, not more than 1.2% of Mn, 0.7-1.7% of Ni, 1.0-1.5% of Cr, 0.4-0.6% of Mo, 0.03-0.08% of V, 0.02-0.04% of Al, 0.0005-0.0020% of B, Fe and unavoidable impurities. The molten steel designed according to the components of the invention can be rolled into the large-thickness steel plate by smelting process, casting process, heating process, rolling process, water cooling process and quenching and tempering process. The steel plate has the advantages of reasonable component design, good comprehensive properties and low production cost, can be applied to off-shore oil production platform engineering, power stations, engineering scaffolds and other industries and has good application prospect.

Description

technical field [0001] The invention belongs to the field of metal materials, in particular to a large-thickness quenched and tempered high-strength steel plate and a production method thereof. Background technique [0002] Most of the 80kg high-strength steel used in the domestic construction machinery industry comes from imports such as WELTEN80C, SUMITEN80 from Japan, SUMTIN780 from Sweden, A514Gr. 0.18%) content is higher, Cr (1.50%), Ni (1.80%) alloy content is higher, the cost price of steel plate rises. The prices of the above-mentioned imported steels are generally high. [0003] With the increasing consumption of high-strength steel in the domestic manufacturing industry, especially the high-strength steel plate used for offshore oil production platforms in my country has a serious supply shortage problem, and has been in an unfavorable situation of relying on imports for a long time. Some domestic steel manufacturers produce steel plates of this strength level, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/32C21C7/10C21D8/02C21D1/18B21B37/16
Inventor 梁永昌谢良法郭桐赵文忠叶建军李红文崔强田苗赵向政宋向前吴建鹏王九清
Owner WUYANG IRON & STEEL
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