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Production method of steel S355NL commercial blank for wind power flange

A wind power flange and production method technology, applied in the field of continuous casting in the metallurgical industry, can solve problems such as fracture, and achieve the effects of simple process, elimination of internal residual stress and low cost

Pending Publication Date: 2021-11-19
BAOTOU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to provide a production method of steel S355NL commercial billets for wind power flanges, which can reduce the occurrence rate of product defects, increase the qualified rate of product quality and market share; it is simple and easy to operate, and can be eliminated without heat treatment The residual internal stress of the billet solves the problem of the S355NL commercial billet breaking when the electric saw cuts it

Method used

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  • Production method of steel S355NL commercial blank for wind power flange
  • Production method of steel S355NL commercial blank for wind power flange
  • Production method of steel S355NL commercial blank for wind power flange

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 2200×300 cross-section is used, carefully check whether the fan-shaped spray bars are clogged before casting, and replace them immediately if they are clogged. The chemical composition during casting is as follows:

[0037] C: 0.16%, Si: 0.20%, Mn: 1.36%, P: 0.007%, S: 0.003%, Alt: 0.028%, Als: 0.026%, Nb: 0.038%, V: 0.048%, Ca: 0.0019, N : 0.0028%; the water flow rate of the wide side of the mold is 4500L / min, the water volume of the narrow side is 370L / min, the water temperature of the crystallizer is 34°C; the temperature of the secondary cooling water is maintained at 22°C; the casting speed is kept at 0.8m / min, and the specific water volume is 0.57L / kg Steel; molten steel superheat 15°C; electromagnetic stirring current 380A, frequency 5Hz; under light pressure, it is set in three sections 6, 7, and 8, and the pressure of each section is 2mm; the pressure of 6~12 sections is as follows:

[0038]

[0039] After cutting, the slabs are directly rolled off the prod...

Embodiment 2

[0041] 2200×300 cross-section is used, carefully check whether the fan-shaped spray bars are clogged before casting, and replace them immediately if they are clogged. The chemical composition during casting is as follows: C: 0.15%, Si: 0.28%, Mn: 1.42%, P: 0.005%, S: 0.002%, Alt: 0.023%, Als: 0.021%, Nb: 0.033%, V: 0.052% , Ca: 0.0021, N: 0.0032%; the water flow rate of the wide side of the mold is 4500L / min, the water volume of the narrow side is 370L / min, the water temperature of the crystallizer is 38°C; the temperature of the secondary cooling water is maintained at 28°C; the casting speed is maintained at 0.8m / min, the ratio The water volume is 0.57L / kg of steel; the superheat of molten steel is 27°C; the electromagnetic stirring current is 380A, and the frequency is 5Hz; under light pressure, it is set in three sections 6, 7, and 8, and the pressure of each section is 2mm; the pressure of sections 6 to 12 is as follows:

[0042]

[0043]

[0044] After cutting, the...

Embodiment 3

[0046] 2200×300 cross-section is used, carefully check whether the fan-shaped spray bars are clogged before casting, and replace them immediately if they are clogged. The chemical composition during casting is as follows: C: 0.17%, Si: 0.24%, Mn: 1.40%, P: 0.006%, S: 0.002%, Alt: 0.035%, Als: 0.033%, Nb: 0.041%, V: 0.048% , Ca: 0.0015, N: 0.0026%; the water flow rate of the wide side of the mold is 4500L / min, the water volume of the narrow side is 370L / min, the water temperature of the crystallizer is 36°C; the temperature of the secondary cooling water is maintained at 25°C; the casting speed is maintained at 0.8m / min, the ratio The water volume is 0.57L / kg of steel; the superheat of molten steel is 21°C; the electromagnetic stirring current is 380A, and the frequency is 5Hz; under light pressure, it is set in three sections 6, 7, and 8, and the pressure of each section is 2mm; the pressure of sections 6 to 12 is as follows:

[0047]

[0048] After cutting, the slabs are dir...

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Abstract

The invention discloses a production method of a steel S355NL commercial blank for a wind power flange. The production method comprises the following steps: the constant superheat degree and the constant pulling speed of a casting machine are guaranteed; the superheat degree of molten steel needs to be ensured to be 15-28 DEG C; the pulling speed is stabilized at 0.7-0.9 m / min; the wide-side water volume of a crystallizer is 4500 L / min, the narrow-side water volume is 370 L / min, and the water temperature of the crystallizer is 36+ / -2 DEG C; the specific water amount of secondary cooling water is 0.57 L per kilogram of steel, and the temperature of the secondary cooling water is maintained at 25+ / -3 DEG C; the electromagnetic stirring parameters are as follows: the current is 380A, and the frequency is 5Hz; soft pressing is performed on three sections of 6, 7 and 8, and each section is pressed by 2mm; and the cut casting blank is immediately put into a slow cooling area for slow cooling. The method is simple and easy to operate, residual internal stress of the casting blank can be eliminated without heat treatment of the casting blank, and the problem that the S355NL commercial blank is broken during cutting by an electric saw is solved.

Description

technical field [0001] The invention relates to the technical field of continuous casting in the metallurgical industry, in particular to a method for producing a steel S355NL commercial billet for wind power flanges. Background technique [0002] In recent years, the world's wind power installed capacity has shown a rapid growth trend. As of February 2021, my country's wind power installed capacity is 280 million kilowatts, a year-on-year increase of 34.3%. With the rapid growth of wind power generation, the market demand for wind power towers is also increasing, and the importance of wind power tower flanges, the key connector of wind power towers, is also getting more and more attention. The wind power tower flange is the key connection, support and force-bearing part of the wind power tower, and is an important part of the wind power generation equipment. S355NL cast slab is used as steel for wind power flanges, which requires good internal and external quality, good co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/18B22D11/22C22C38/02C22C38/04C22C38/06C22C38/12
CPCB22D11/18B22D11/22C22C38/02C22C38/04C22C38/06C22C38/12
Inventor 刘志国李鑫丁晓志让丽军李立英
Owner BAOTOU IRON & STEEL GRP
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