A low-carbon anti-fatigue steel plate for wind power and its preparation method

An anti-fatigue and wind power technology, applied in the field of iron and steel metallurgy, can solve the problems of high strength, good weldability and anti-fatigue performance, low impact energy at the core of the steel plate, complex component selection, etc., and achieve low welding cracks. Sensitivity index, tissue homogeneity, effect of low carbon equivalent

Active Publication Date: 2022-05-17
UNIV OF SCI & TECH BEIJING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The technical problem solved by the present invention is that the steel used in wind power in the prior art has high preparation cost, complex composition selection, high strength, good weldability and fatigue resistance can not be achieved at the same time, either the yield strength is low, or it is -40 ℃ The impact energy of the core of the steel plate is low, or the welding performance is low, which is difficult to meet the market demand.

Method used

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  • A low-carbon anti-fatigue steel plate for wind power and its preparation method
  • A low-carbon anti-fatigue steel plate for wind power and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] A low-carbon anti-fatigue steel plate for wind power, the chemical composition (wt.%) is C: 0.09%, Si: 0.25%, Mn: 1.53%, Nb: 0.022%, Al: 0.037%, Ti: 0.016%, Ni: 0.14%, V: 0.023%, Cr: 0.02%, N: 0.072%, P: 0.011, S: 0.001%, O: 0.0016%, CEV=0.37, PCM=0.19, and the rest are Fe and unavoidable impurities.

[0048] In the thermal process of the steel plate heat treatment process, the billet is heated at a temperature of 1188° C. and held for 54 minutes. In the TMCP process, the starting temperature of rolling is 1176°C, the total deformation of rough rolling is 65%, and the reduction in two passes after rough rolling is 27%, and the starting temperature of finish rolling is 895°C, and the reduction rate is 71%. In the subsequent cooling stage, the cooling rate was 8°C / s.

[0049] In the tempering heat treatment stage, the temperature is controlled at 477°C, and the holding time is 10 minutes.

[0050] Such as figure 2 As shown, the average grain size of the steel for wind...

Embodiment 2

[0052] A low-carbon anti-fatigue steel plate for wind power, the chemical composition (wt.%) is C: 0.098%, Si: 0.27%, Mn: 1.55%, Nb: 0.025%, Al: 0.046%, Ti: 0.016%, Ni: 0.16%, V: 0.024%, Cr: 0.02%, N: 0.065%, P: 0.01, S: 0.004%, O: 0.0016%, CEV=0.38, PCM=0.19, and the rest are Fe and unavoidable impurities.

[0053] In the thermal process of the steel plate heat treatment process, the billet is heated at a temperature of 1188° C. and held for 55 minutes. In the TMCP process, the starting temperature of rolling is 1173°C, the reduction rate of rough rolling is 68%, and the reductions of the two passes after rough rolling are 25% and 26% respectively, the starting temperature of finishing rolling is 896°C, and the reduction rate is 71% , followed by a cooling stage with a cooling rate of 8°C / s.

[0054] In the tempering heat treatment stage, the temperature is controlled at 479°C, and the holding time is 10 minutes.

[0055] The average grain size of the steel for wind power i...

Embodiment 3

[0057] A low-carbon anti-fatigue steel plate for wind power, the chemical composition (wt.%) is C: 0.10%, Si: 0.30%, Mn: 1.50%, Nb: 0.026%, Al: 0.04%, Ti: 0.017%, Ni: 0.17%, V: 0.026%, Cr: 0.06%, N: 0.05%, P: 0.01, S: 0.003%, O: 0.0018%, CEV=0.36, PCM=0.19, and the rest are Fe and unavoidable impurities.

[0058] In the thermal process of the steel plate heat treatment process, the billet is heated at a temperature of 1168° C. and held for 65 minutes. In the TMCP process, the starting temperature of rolling is 1160°C, the reduction rate of rough rolling is 65%, and the reductions in the last two passes are 25% and 26% respectively, the starting temperature of finishing rolling is 890°C, and the reduction rate is 72%, and then In the cooling stage, the cooling rate is 10°C / s.

[0059] In the tempering heat treatment stage, the temperature is controlled at 482°C, and the holding time is 10 minutes.

[0060] The average grain size of the steel for wind power is 11 μm, composed ...

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Abstract

The invention discloses a low-carbon anti-fatigue steel plate for wind power and a preparation method thereof, belonging to the technical field of iron and steel metallurgy. The chemical composition and mass percentage of the steel plate for wind power are: C: 0.08-0.12%, Si: 0.25-0.35%, Mn: 1.45-1.60%, Nb: 0.02-0.03%, Al; 0.03-0.05%, Ti : 0.01‑0.02%, Ni: 0.10‑0.20%, V: 0.02‑0.03%, Cr≤0.10%, N≤0.008%, P≤0.012%, S≤0.005%, O≤0.002%, the rest is Fe and not Avoid impurities. The preparation method includes billet heating, rough rolling process, finish rolling process, cooling process and tempering heat treatment. The invention improves the yield strength and fatigue strength of the steel plate for wind power, has excellent welding performance, and increases the service life of the steel for wind power.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and relates to a low-carbon fatigue-resistant steel plate for wind power and a preparation method thereof. Background technique [0002] Wind energy resource is a kind of clean renewable energy, which belongs to a conversion form of solar energy. Not only is the cost of developing and utilizing wind energy lower than that of solar energy, but it is also one of the most promising renewable energy sources. With the development of modern society, many non-renewable energy sources are consumed in large quantities, and various environmental pollution problems have also triggered the global environmental crisis. China is a major energy importer in the world. The huge consumption of non-renewable energy sources will inevitably cause pollution to the surrounding environment and affect the natural ecology. environment, so the use of renewable energy is a top priority for our country, an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C21D8/02C22C33/04
CPCC22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C22C33/04C21D8/0205C21D8/0226C21D8/0263Y02E10/72
Inventor 何金珊刘世豹武会宾王西涛麻衡王中学王月香
Owner UNIV OF SCI & TECH BEIJING
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