E-level extra-thick high-intensity steel plate produced by using continuous casting billet and production method thereof

A technology of high-strength steel plate and production method, which is applied to the production of E-grade extra-thick high-strength steel plate by continuous casting slab and its production field, can solve the problems of increasing production cycle, complicated process and high cost, and achieve component saving, low cost, and low cost. The effect of production cost and cycle time

Inactive Publication Date: 2015-10-21
WUYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that the thickness of the steel plate produced by this method has been improved to a certain extent, but it is co

Method used

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  • E-level extra-thick high-intensity steel plate produced by using continuous casting billet and production method thereof
  • E-level extra-thick high-intensity steel plate produced by using continuous casting billet and production method thereof
  • E-level extra-thick high-intensity steel plate produced by using continuous casting billet and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0034] Example 1 : The composition ratio and specific production process of this E-grade extra-thick and high-strength steel sheet are as follows.

[0035] The thickness of this steel plate is 190mm, and it is composed of the following components by weight percentage: C 0.16%, Si 0.35%, Mn 1.48%, P 0.015%, S 0.002%, Nb 0.024%, Alt 0.033%, the balance is Fe and non Avoid impurities, CEV=0.42%.

[0036] The process steps of this high-strength steel plate production method are as follows: (1) Smelting and continuous casting process: the molten steel is first smelted in an electric furnace, and then transferred to LF refining, ensuring good argon blowing throughout the entire refining process, the Al line is 450m, and the refining white slag retention time 30min, lime consumption is 16kg / t steel, total refining time is 50min, process and slag removal Al≥0.010%. After refining, it is transferred to VD furnace vacuum for degassing treatment, and the vacuum holding time is 17 minutes. ...

Example Embodiment

[0039] Example 2 : The composition ratio and specific production process of this E-grade extra-thick and high-strength steel sheet are as follows.

[0040] The thickness of this steel plate is 200mm, and it is composed of the following components by weight percentage: C 0.16%, Si 0.44%, Mn 1.50%, P 0.009%, S 0.010%, Nb 0.023%, Alt 0.020%, the balance is Fe and non Avoid impurities, CEV=0.42%.

[0041] The process steps of this high-strength steel plate production method are as follows: (1) Smelting and continuous casting process: the smelting process is the same as in Example 1. In the continuous casting process, the superheat is between 18-22°C, and the pulling speed is 0.65m / min; the second stage (9-11 stages) of continuous casting is lightly reduced to 3.2mm to produce a continuous casting billet with a thickness of 330mm; after continuous casting The offline stacking is slowly cooled, the stacking temperature is 830℃, and the stacking time is 24h.

[0042] (2) Heating rolling:...

Example Embodiment

[0044] Example 3 : The composition ratio and specific production process of this E-grade extra-thick and high-strength steel sheet are as follows.

[0045] The thickness of the steel plate is 210mm, and it is composed of the following components by weight percentage: C 0.18%, Si 0.15%, Mn 1.48%, P 0.011%, S 0.015%, Nb 0.022%, Alt 0.050%, the balance is Fe and non Avoid impurities, CEV=0.44%.

[0046] The process steps of this high-strength steel plate production method are as follows: (1) Smelting and continuous casting process: the smelting process is the same as in Example 1. During the continuous casting process, the superheat is 15-20℃, the drawing speed is 0.65m / min; the second stage (9-11 stages) of continuous casting is lightly reduced by 3.3mm to produce a 330mm thick continuous casting billet; after continuous casting, it is offline The stacking is slowly cooled, the stacking temperature is 900℃, and the stacking time is 26h.

[0047] (2) Heating rolling: heating coeffici...

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Abstract

The invention discloses an E-level extra-thick high-intensity steel plate produced by using continuous casting billet and a production method thereof. The steel plate includes the following chemical components by weight percent: 0.16-0.19% of C, 0.15-0.55% of Si, 1.45-1.58% of Mn, less than or equal to 0.018% of P, less than or equal to 0.015% of S, 0.020-0.025% of Nb, 0.020-0.050% of Alt, and the balance of Fe and unavoidable impurities; carbon equivalent CEV is 0.40-0.46%. According to the production method, optimized components, an advanced smelting technology, an optimized continuous casting process (low super-heat degree for casting, low casting speed and reasonable light pressure), and an improved heating and rolling process (heating by stages) are adopted to smelt high-quality continuous casting billet; continuous casting billet is directly used as blank instead of steel ingots, and deficiencies of the prior art are overcome; compared with the steel plate produced by using steel ingots, the E-level extra-thick high-intensity steel plate produced by using continuous casting billet has the advantages that the production process is simplified, the production cost is reduced, and the production period is shortened; compared with the steel plate produced by composite billet, the E-level extra-thick high-intensity steel plate produced by using continuous casting billet has the advantages that the plate billet composition process is eliminated; the method of using continuous casting billet to produce the high-intensity steel plate enables the thickness of the steel plate to be enlarged to 240 mm and the compression ratio to decrease to 1.38 for the first time.

Description

technical field [0001] The invention relates to a high-strength steel plate and a production method thereof, in particular to an E-grade extra-thick high-strength steel plate produced by continuous casting slabs and a production method thereof. Background technique [0002] With the rapid development of medium and heavy plate continuous casting technology (fast cooling speed, continuous casting, and controllable and stable casting conditions) at home and abroad, the thickness range of continuous casting products is increasingly required. The demand for high-strength steel plates is increasing. At present, steel ingots, electroslag remelting or composite blanks are required to produce steel plates with a thickness of 150mm or more in domestic and foreign steel production industries. The production cycle is long, the cost is high, the process is complicated, and the yield is not high, the product quality is unstable, and the market competitiveness Poor, difficult to meet cust...

Claims

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Application Information

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IPC IPC(8): C22C38/12C21D8/02
Inventor 王晓书韦明谢良法张朋张海军高雅张志军徐腾飞
Owner WUYANG IRON & STEEL
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