Manufacturing technique of heavy piece-weight thick steel plate used for offshore wind turbine tower tube

A manufacturing process and technology for wind power towers, which are applied in the field of manufacturing processes of large single-weight and thick steel plates for offshore wind power towers, can solve the problems of difficulty in meeting the single-weight requirements of wind power towers, low production efficiency, and low yield, and achieve good results. The effect of comprehensive mechanical properties, high production efficiency and low cost

Inactive Publication Date: 2012-11-07
JIGANG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In China, ordinary continuous casting billets are limited by the width of the rolling mill, and it is generally difficult to meet the single weight requirements of steel for ...

Method used

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  • Manufacturing technique of heavy piece-weight thick steel plate used for offshore wind turbine tower tube
  • Manufacturing technique of heavy piece-weight thick steel plate used for offshore wind turbine tower tube
  • Manufacturing technique of heavy piece-weight thick steel plate used for offshore wind turbine tower tube

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1: Production of 95*2500*18800mm specification S355G8+N steel plates for manufacturing offshore wind power towers, with a unit weight of 35t:

[0032] 1) Smelting of high-purity molten steel. After the molten steel is smelted in a converter, LF+RH double refining is carried out. LF refining fully removes inclusions and desulfurization. RH vacuum treatment maintains a vacuum degree of 0.8Torr for 12 minutes to further remove inclusions and gases. The gas [O] 10ppm, [H] 1.5ppm.

[0033] 2) The molten steel continuous casting process adopts the whole process of protective pouring, and uses electromagnetic stirring, constant-speed pouring and other means. The low-magnification analysis results of the cast slab have a central segregation of class C 1.0, and there are no defects such as intermediate cracks and looseness. Two continuous casting slabs of 300*2100*4100mm were produced, and the analysis results of the smelting composition are as follows:

[0034] Table 1 E...

Embodiment 2

[0047] Example 2: Production of 95*2500*18800mm specification S355G8+N steel plates for manufacturing offshore wind power towers, with a unit weight of 35t:

[0048] 1) Smelting of high-purity molten steel. After the molten steel is smelted in a converter, LF+RH double refining is carried out. LF refining fully removes inclusions and desulfurization. RH vacuum treatment maintains a vacuum degree of 0.8Torr for 15 minutes to further remove inclusions and gases. The gas [O] 8ppm, [H] 1.2ppm.

[0049] 2) The molten steel continuous casting process adopts the whole process of protective pouring, and uses electromagnetic stirring, constant-speed pouring and other means. The low-magnification analysis results of the cast slab have a central segregation of class C 1.0, and there are no defects such as intermediate cracks and looseness. Two continuous casting slabs of 300*2100*4100mm were produced, and the analysis results of the smelting composition are as follows:

[0050] Table 2 ...

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Abstract

The invention discloses a manufacturing technique of a heavy piece-weight thick steel plate used for an offshore wind turbine tower tube. The chemical components of the used continuous casting slabs are as follows: 0.08-0.16% of C, 0.20-0.50% of Si, 1.10-1.60% of Mn, less than or equal to 0.010% of S, less than or equal to 0.010% of P and less than or equal to 0.50% of micro-alloyed elements; and at least two continuous casting slabs are provided with grooves, overlapped and welded into a big-thickness continuous casting blank by using a combined welding technique of gas shielded welding, submerged-arc welding and electron-bombardment welding, and then, the blank is arranged in a bogie-type furnace or a soaking pit furnace for heating, rolled by a thick plate rolling machine after being discharged from the furnace, cooled under control and subjected to heat treatment so as to obtain the heavy piece-weight thick steel plate used for the offshore wind turbine tower tube. The technique has the following characteristics that the maximum piece weight of the steel plate used for the offshore wind turbine tower tube is 40t, the requirement of reducing welding lines in the tower tube manufacturing process is satisfied, the manufacturing technique is simple in production process, high in yield, high in ultrasonic flaw detection rate of more than 98% and excellent in each factor such as low-temperature roughness, Z-direction performance and the like.

Description

technical field [0001] The invention belongs to the field of metal materials, and relates to a manufacturing method of a large single heavy steel plate for an offshore wind power tower. Background technique [0002] Wind power generation is the clean energy power generation method with the most large-scale development conditions and commercialization prospects. Under the policies of various countries to vigorously develop clean energy, the wind power industry has developed rapidly. In recent years, especially offshore wind power generation has become a development trend. Large-scale wind turbines need wind power towers as their support. The steel tower is the main structure of the wind power tower. It not only plays a supporting role, but also absorbs the vibration energy of the unit, which is crucial to the safety of the unit. At present, with the development of wind power, the steel market for wind power towers is in great demand, and the future development prospects are b...

Claims

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Application Information

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IPC IPC(8): B23P15/00B23K28/02B23K33/00C22C38/04C21D8/02
Inventor 孙卫华马兴云毕志超赵乾崔健刘晓东
Owner JIGANG GRP
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