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A kind of large unit weight extra thick offshore wind power steel and its production method

An offshore wind power, large unit weight technology, applied in the field of iron and steel materials, can solve the problems of poor weldability of normalizing heat treatment steel plates, and achieve the effects of reducing alloy costs and heat treatment costs, good fracture toughness, and good strength and toughness matching

Active Publication Date: 2022-01-18
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the technical problem of poor weldability of the normalizing heat treatment steel plate, the invention provides a large unit weight and extra thick steel for offshore wind power. The steel plate has excellent welding performance while meeting the large unit weight and extra thick specifications

Method used

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  • A kind of large unit weight extra thick offshore wind power steel and its production method
  • A kind of large unit weight extra thick offshore wind power steel and its production method
  • A kind of large unit weight extra thick offshore wind power steel and its production method

Examples

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Effect test

Embodiment 1

[0055] A kind of 60mm large unit weight and extra thick steel for offshore wind power of the present invention is obtained by the following method:

[0056] The chemical composition of molten steel includes: C: 0.06%, Si: 0.20%, Mn: 1.40%, P: 0.008%, S: 0.0012%, Nb: 0.025%, Ti: 0.015%.

[0057] After molten iron treatment, converter, LF refining, VD vacuum treatment, continuous casting of molten steel into 300mm thick continuous casting slab; after being fully heated in a walking beam heating furnace at 1200°C, it is descaled in a descaling machine, and the rolling process adopts two stages Rolling, the rough rolling stage adopts a low-speed and large-reduction process, the maximum single-pass reduction is 20.5%, the waiting temperature is 100mm, the finish rolling start temperature is 830°C, and the first pass of the finish rolling process adopts a large-reduction process. The reduction in the subsequent passes decreases in turn. After finishing rolling, the pre-leveling mach...

Embodiment 2

[0064] The present invention is a 100mm large unit weight and extra thick offshore wind power steel, which is obtained by the following method:

[0065] The chemical composition of molten steel includes: C: 0.055%, Si: 0.25%, Mn: 1.45%, P: 0.010%, S: 0.0015%, Nb: 0.032%, Ti: 0.015%.

[0066] After molten iron treatment, converter, LF refining, VD vacuum treatment, and continuous casting of molten steel, it becomes a continuous casting slab with a thickness of 400mm; After heating, enter the descaling machine for descaling. The rolling process adopts two-stage rolling. The rough rolling stage adopts a low-speed and high-reduction process. The maximum single-pass reduction is 18.5%. 840°C, the first pass of the finishing rolling process adopts a large reduction process, and the reduction in the subsequent passes decreases successively. After finishing rolling, pre-leveling is carried out as a pre-leveling machine. The roll gap is set to 99.5mm, and the pre-leveling Then enter t...

Embodiment 3

[0073] The present invention is a 150mm large unit weight and extra thick offshore wind power steel, which is obtained by the following method:

[0074] The chemical composition of molten steel includes: C: 0.045%, Si: 0.25%, Mn: 1.45%, P: 0.008%, S: 0.0012%, Nb: 0.03%, Ti: 0.015%, Ni: 0.10%, Cr : 0.15%.

[0075] After molten iron treatment, converter, LF refining, VD vacuum treatment, continuous casting of molten steel into 400mm thick continuous casting slab; billet size is 400*2400*4200mm, single billet weight is 31.5 tons, fully heated by walking beam heating furnace at 1220℃ Finally, enter the descaling machine for descaling. The rolling process adopts two-stage rolling. The rough rolling stage adopts a low-speed and large-reduction process. The maximum single-pass reduction is 18.0%. ℃, the first pass of the finishing rolling process adopts a large reduction process, and the reduction in the subsequent passes decreases in turn. After finishing rolling, pre-leveling is c...

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Abstract

The invention provides a large unit weight and extra thick steel for offshore wind power, which belongs to the technical field of iron and steel materials. The chemical composition of the steel for offshore wind power is: C: 0.045-0.075%, Si: 0.20-0.30%, Mn: 1.30-1.60%, P≤0.010%, S≤0.003%, Cr≤0.20%, Nb: 0.025-0.035%, Ti: 0.01-0.02%, and the rest are Fe and unavoidable impurities. The steel plate has excellent welding performance while meeting the specifications of large unit weight and extra thickness. The invention also provides a production method of large unit weight and extra thick offshore wind power steel.

Description

technical field [0001] The invention belongs to the technical field of iron and steel materials, and relates to a large unit weight and extra thick offshore wind power steel and a production method thereof. Background technique [0002] As one of the important directions for the development and utilization of renewable energy, offshore wind power has become a research hotspot in the development of global wind power. Sea wind has the advantages of good stability and large power generation, and is currently developing rapidly around the world. With the development of offshore wind power in the direction of large-scale installed capacity and offshore installation, the steel tower supported by large-scale wind turbines must bear the weight of the unit on the one hand, and absorb the vibration energy of the unit at the same time. The unit plays an important role, and therefore puts forward performance requirements such as large thickness, high toughness, and easy welding for offs...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/26C22C38/28C22C38/38C21D8/02C21C7/10
CPCC22C38/02C22C38/04C22C38/002C22C38/26C22C38/28C22C38/38C21D8/0226C21C7/10C21D2211/005C21D2211/009
Inventor 黄乐庆狄国标何元春马国金王彦锋杨永达马龙腾王朦李建超胡荣强胡斌邓文玄玉民
Owner SHOUGANG CORPORATION
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