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Easy-welding tempering high-strength steel plate for ocean platform and production method thereof

A high-strength steel plate and offshore platform technology, applied in the field of low-alloy high-strength welded structural steel manufacturing, can solve the problems of narrow specification range and inability to meet the market demand for thick plates, achieve less precious metal content, improve equipment performance and service life, The effect of reducing production costs

Inactive Publication Date: 2015-01-07
WUYANG IRON & STEEL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] As the amount of high-strength steel in the domestic construction machinery industry gradually increases, some domestic steel manufacturers produce steel plates of this level, but due to the narrow range of specifications, all are 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

[0022] The composition of the quenched and tempered high-strength steel in this example is as follows: C 0.14%, Si 0.27%, Mn 1.16%, P 0.015%, S 0.001%, Mo 0.41%, Ni 1.2%, Cr 1.04% , Nb 0.024%, V 0.033%, B 0.002%, Ti 0.015%, Al 0.064%, the balance is Fe and unavoidable impurities, rolled into 88mm steel plate.

[0023] Its mechanical properties: yield strength: 820MPa, tensile strength: 880MPa, A is 20%, -27°C impact energy AKV (longitudinal): 119, 129, 159J, -37°C impact energy AKV (longitudinal): 131, 126, 100J.

Embodiment 2

[0025] The composition of the quenched and tempered high-strength steel in this example is as follows: C 0.14%, Si 0.25%, Mn 1.15%, P 0.012%, S 0.002%, Mo 0.43%, Ni 1.25%, Cr 1.03% , Nb 0.027%, V 0.035%, B 0.0023%, Ti 0.019%, Al 0.050%, and the balance is Fe and inevitable inclusions. Ceq is 0.56%, rolled into 88mm steel plate.

[0026]Its mechanical properties: yield strength: 825MPa, tensile strength: 895MPa, A is 18%, -27°C impact energy AKV (longitudinal): 199, 199, 180J, -37°C impact energy AKV (longitudinal): 192, 190, 167J.

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PUM

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Abstract

The invention discloses an easy-welding tempering high-strength steel plate for an ocean platform and a production method thereof. The easy-welding tempering high-strength steel plate for the ocean platform is prepared by the following chemical compositions in percent by weight: not higher than 0.18 percent of C, 0-0.15 to 0.35 percent of Si, 0.95 to 1.30 percent of Mn, not higher than 0.035 percent of P, not higher than 0.01 percent of S, 1.20 to 1.50 percent of Ni, 1.00 to 1.50 percent of Cr, 0.4 to 0.6 percent of Mo, not higher than 0.05 percent of Nb, 0.03 to 0.08 percent of V, not higher than 0.020 percent of Ti, not higher than 0.003 percent of B, 0.020 to 0.085 percent of Alt, and the balance of Fe and inevitable impurities. The thickness of the easy-welding tempering high-strength steel plate for the ocean platform is from 60 to 100 mm. The easy-welding tempering high-strength steel plate for the ocean platform is prepared by the following method: smelting-vacuum decarburization-LF furnace refining-pouring-cleaning-heating-rolling-water cooling after rolling-tempering-inspection and storage. The easy-welding tempering high-strength steel plate for the ocean platform has an outstanding combination property, is used for engineering machinery, has high surplus amount of impact toughness, can be widely used for engineering supports and other projects needing high-strength steel plates, and has a great application prospect. The easy-welding tempering high-strength steel plate for the ocean platform has simplicity in rolling technology, wide scope of tempering technology and easiness in operation, and is suitable for the production of the steel plant.

Description

technical field [0001] The invention belongs to the field of manufacturing low-alloy high-strength welded structural steel, and in particular relates to an easy-weld quenched and tempered high-strength A517GrQ Modified steel plate for offshore platforms, and also relates to a production method of the easy-weld quenched and tempered high-strength steel plate. Background technique [0002] Traditional quenched and tempered steel has the disadvantages of high carbon content, high alloy content and high carbon equivalent, which bring about high cost and unsatisfactory welding performance. Most of the high-strength steel in the domestic construction machinery industry comes from imports such as American A514Gr.B and DILLMAX690 steel plates produced by German DILLINGER Steel Company. The content of C (0.18%), Cr (1.50%), Ni ( 1.80%) alloy content is higher, and the cost price of steel plate rises. The prices of the above-mentioned imported steels are generally high. [0003] As ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/44C22C33/04C21D8/02
Inventor 宋向前袁忠业李劲峰孔祥丽齐燕管秀兵秦红新肖雄峰杨斌张晓克温冰
Owner WUYANG IRON & STEEL
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