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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 completed by adding more smelting processes, the production cycle increases, the cost is high, and the process becomes complicated

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

Embodiment 1

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

[0035] The thickness of this steel plate is 190mm, and it is composed of the following components in weight percentage: C 0.16%, Si 0.35%, Mn 1.48%, P 0.015%, S 0.002%, Nb 0.024%, Alt 0.033%, and the balance is Fe and not Avoided 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. The whole process ensures good argon blowing. The Al line of the entire refining process is 450m, and the refining white slag is kept for a long time. 30min, lime consumption 16kg / t steel, total refining time 50min, process and slag removal Al ≥ 0.010%. After refining, transfer to VD furnace for vacuum degassing treatment, the vacuum holding time is 17m...

Embodiment 2

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

[0040] The thickness of this steel plate is 200mm, and it is composed of the following components in 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 not Avoided impurities, CEV=0.42%.

[0041] The process steps of the high-strength steel plate production method are as follows: (1) smelting and continuous casting process: the smelting process is the same as that in Embodiment 1. During the continuous casting process, the degree of superheat is between 18-22°C, and the casting speed is 0.65m / min; the rear section of the continuous casting (9-11 section) is lightly reduced to 3.2mm, and a continuous casting slab with a thickness of 330mm is produced; after continuous casting Off-line stacking is slowly cooled, the stacking temperature is 830°C, and the stacking time is 2...

Embodiment 3

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

[0045] The thickness of this steel plate is 210mm, and it is composed of the following components in weight percentage: C 0.18%, Si 0.15%, Mn 1.48%, P 0.011%, S 0.015%, Nb 0.022%, Alt 0.050%, and the balance is Fe and not Avoided impurities, CEV=0.44%.

[0046] The process steps of the high-strength steel plate production method are as follows: (1) smelting and continuous casting process: the smelting process is the same as that in Embodiment 1. During the continuous casting process, the degree of superheat is 15-20°C, and the casting speed is 0.65m / min; the rear section of the continuous casting (9-11 section) is lightly reduced to 3.3mm to produce a continuous casting slab with a thickness of 330mm; The stacking is slowly cooled, the stacking temperature is 900°C, and the stacking time is 26h.

[0047] (2) Heating and rolling: t...

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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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