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Low-carbon equivalent S355NL normalizing thick plate for wind power and production method thereof

A production method and technology of carbon equivalent, applied in the field of metallurgy, can solve problems such as high carbon equivalent, which cannot meet the requirements of wind power steel, and achieve excellent welding performance, appropriate production cost control, and good overall cost performance

Inactive Publication Date: 2019-07-23
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem that the existing S355NL thick plate has a high carbon equivalent and cannot meet the requirements of wind power steel, the present invention controls the low carbon equivalent CEV ≤ 0.40% through reasonable element design, and adopts continuous casting slab rolling process and normalizing heat treatment Technology, etc., developed S355NL thick plate with a maximum thickness of 100mm. The composition and performance of the steel plate fully meet the requirements of EN10025-3 standards. The steel plate has excellent welding performance and meets the requirements of the wind tower door frame for service in low temperature and harsh environments.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The thickness of the S355NL steel plate is 100mm, and the following composition ratio and production method are adopted, and the composition content (wt) is: C0.12%, Mn1.36%, P0.011%, S0.003%, Si0.42%, Alt0. 034%, Nb0.03%, V0.045%, Ni0.34%, CEV0.38%, and the rest are Fe and impurities.

[0026] The production method of this steel plate is as follows:

[0027] (1) Steelmaking process: converter deep dephosphorization molten steel P: 0.012%, hot metal pretreatment and LF deep desulfurization molten steel S: 0.003%, continuous casting slab thickness 320mm.

[0028] (2) Heating process: the heating process is as follows: the heating coefficient of the billet is 9.6min / cm, and the heating temperature is 1195°C.

[0029] (3) Rolling process: 2-stage controlled rolling process is adopted, the rolling end temperature of the first stage is 1008°C; the rolling start temperature of the second stage is 813°C, and the final rolling temperature is 799°C.

[0030] (4) Cooling proces...

Embodiment 2

[0034] The thickness of the S355NL steel plate is 100mm, the following composition ratio and production method are adopted, and the composition content (wt) is: C0.14%, Mn1.30%, P0.010%, S0.002%, Si0.38%, Alt0. 031%, Nb0.033%, V0.049%, Ni0.27%, CEV0.39%, and the rest are Fe and impurities.

[0035] The production method of this steel plate is as follows:

[0036] (1) Steelmaking process: converter deep dephosphorization molten steel P: 0.010%, hot metal pretreatment and LF deep desulfurization molten steel S: 0.002%, continuous casting slab thickness 320mm.

[0037] (2) Heating process: the heating process is as follows: the heating coefficient of the billet is 11.8min / cm, and the heating temperature is 1202°C.

[0038] (3) Rolling process: 2-stage controlled rolling process is adopted, the temperature at the end of rolling at the first stage is 1021°C; the temperature at the start of rolling at the second stage is 812°C, and the temperature at the end of rolling is 793°C.

...

Embodiment 3

[0043] The thickness of the S355NL steel plate is 100mm, and the following composition ratio and production method are adopted, and the composition content (wt) is: C0.13%, Mn1.33%, P0.012%, S0.001%, Si0.44%, Alt0. 034%, Nb0.034%, V0.047%, Ni0.32%, CEV0.39%, and the rest are Fe and impurities.

[0044] The production method of this steel plate is as follows:

[0045] (1) Steelmaking process: converter deep dephosphorization molten steel P: 0.012%, hot metal pretreatment de- and LF deep desulfurization molten steel S: 0.001%, continuous casting slab thickness 320mm.

[0046] (2) Heating process: the heating process is as follows: the heating coefficient of the billet is 10.2min / cm, and the heating temperature is 1205°C.

[0047] (3) Rolling process: 2-stage controlled rolling process is adopted, the rolling end temperature of the first stage is 1015°C; the rolling start temperature of the second stage is 807°C, and the final rolling temperature is 788°C.

[0048] (4) Cooling ...

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Abstract

The invention discloses a low-carbon equivalent S355NL normalizing thick plate for wind power and a production method thereof. The thick plate is characterized by comprising the chemical components byweight: 0.10-0.14% of C, 1.20- 1.40 % of Mn, 0.35-0.45% of Si, less than or equal to 0.015% of P, less than or equal to 0.005 % of S, 0.020-0.035% of Nb, 0.030-0.050% of V, 0.20 -0.40% of Ni, 0.020-0.050% of Alt and the balance Fe, other impurities, and less than or equal to 0.40% of CEV. According to the thick plate and the method, the components are reasonably designed, the carbon equivalent CEV is controlled less than or equal to 0.40%, so that excellent welding property of the steel plate is guaranteed, and the low-carbon equivalent technical requirement of wind power design is met. In order to reduce the influence of the design of low-carbon equivalent on the strength after normalization, elements without affecting the low-carbon equivalent are added in the component design, therefore, the yield and tensile strength meet the standard requirements while the steel plate is ensured to be normalized with minus 50 DEG C low-temperature impact.

Description

technical field [0001] The invention relates to a production method of a steel plate in the field of metallurgy, in particular to a low-carbon equivalent S355NL normalized thick plate for wind power and a production method thereof. Background technique [0002] With the large-scale development of wind power generation equipment, the demand for large-scale steel plates and welding performance is getting higher and higher. S355NL thick plates are EN10025-3 standard products, which require normalizing or normalizing rolling delivery, and are mainly used in wind power and hydropower. Key structural parts such as marine engineering and marine engineering have strict requirements on the low-temperature impact performance, welding performance, lamellar tear resistance and internal quality of the product. For the existing S355NL thick plate, in order to ensure the strength requirements after normalizing and the low-temperature impact performance at -50°C, more alloying elements are ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/12C22C38/08C22C38/06C21D8/02
CPCC21D8/0205C21D8/0226C21D8/0247C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12
Inventor 潘中德方磊高飞胡其龙姜金星郭怀兵陈富强顾小阳王思聪
Owner NANJING IRON & STEEL CO LTD