Production method of rack steel for self-elevating oil extraction platform

An oil production platform and production method technology, applied in the field of metal materials, can solve the problems of production thickness only reaching 120-150mm, low production efficiency, low yield, etc., and achieve improved welding efficiency, high production efficiency and good mechanical properties. Effect

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

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Problems solved by technology

The thickness of the rack steel is required to be more than 80 mm, and the thickest reaches 210 mm. Generally, die-cast steel ingots, electroslag ingots, etc. are used for rolling production. The process has disadvantages such as low yield, high energy consumption, and low production efficiency.
Compared with die-cast steel ingots and electroslag ingots, continuous casting slabs have high production efficiency and good quality, but limited by the thickness of continuous casting slabs, it is very difficult to produce rack steel plates with continuous casting slabs in China. Generally, the maximum thickness can only reach 80mm
Patent CN102345045A "A Steel A514GrQ Steel Plate for Offshore Platform Racks and Its Production Method" discloses a method for steel A514GrQ steel plates for racks, but the raw materials used are still die-cast steel ingots, and the production thickness can only reach 120- 150mm

Method used

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  • Production method of rack steel for self-elevating oil extraction platform
  • Production method of rack steel for self-elevating oil extraction platform
  • Production method of rack steel for self-elevating oil extraction platform

Examples

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Effect test

Embodiment 1

[0030] Embodiment 1: 150mm thick rack steel is produced by a combined welding process of gas shielded welding, submerged arc welding and vacuum electron beam welding:

[0031] 1) High-purity molten steel is smelted. After the molten steel is smelted in a converter, LF+RH double refining is carried out. RH vacuum treatment maintains a vacuum degree of 100Pa for 11 minutes. After refining, the molten steel gas contains [O] 12ppm, [H] 2ppm.

[0032] 2) The continuous casting process of molten steel adopts full protection pouring, and uses electromagnetic stirring to pour at a constant speed. The thickness of the continuous casting slab produced is 250mm, and the analysis results of the smelting composition are as follows:

[0033] Table 1 Example 1 Continuous Casting Slab Chemical Composition

[0034]

[0035]3) Process the three sides of the two produced 250mm thick continuous casting slabs to be welded by the flame cutting method. The groove depth is 25mm and the groove ang...

Embodiment 2

[0046] Example 2: Production of 150mm thick rack steel by full vacuum electron beam welding:

[0047] 1) High-purity molten steel is smelted. After the molten steel is smelted in a converter, LF+RH double refining is carried out. RH vacuum treatment maintains a vacuum degree of 100Pa for 11 minutes. After refining, the molten steel gas contains [O] 12ppm, [H] 2ppm.

[0048] 2) The continuous casting process of molten steel adopts full protection pouring, and uses electromagnetic stirring to pour at a constant speed. The thickness of the continuous casting slab produced is 250mm, and the analysis results of the smelting composition are as follows:

[0049] Table 2 Example 2 Continuous Casting Slab Chemical Composition

[0050]

[0051] 3) Process the produced two 250mm thick continuous casting slabs with a milling machine to remove surface oxide scales, oil stains, etc., and process the two slabs into the same size.

[0052] 4) After the processed blanks are stacked togeth...

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Abstract

The invention discloses a production method of rack steel for a self-elevating oil extraction platform, and belongs to the field of metal materials. At least two continuous casting sheet billets are used as raw material. The continuous casting sheet billets are welded into billets with large thickness by combining gas shielded welding, submerged arc welding, and vacuum electron beam welding or full-vacuum electron beam welding. The billets with large thickness are heated in a bogie-type furnace or a soaking furnace. The heated billets are rolled through a heavy plate mill, water-cooled, and heat treated to obtain the rack steel for the self-elevating oil extraction platform. The rack steel produced by the method is fine in steel plate comprehensive mechanical performance, high in operability, low in cost, and high in production efficiency.

Description

technical field [0001] The invention belongs to the field of metal materials, and relates to a production method of rack steel for a self-elevating oil production platform. Background technique [0002] The extra-thick and high-strength rack steel for self-elevating offshore platforms is currently the most high-end product in the offshore industry. The thickness of the rack steel is required to be more than 80mm, and the thickest reaches 210mm. Generally, die-casting steel ingots, electroslag ingots, etc. are used for rolling production. The process has disadvantages such as low yield, high energy consumption, and low production efficiency. Compared with die-cast steel ingots and electroslag ingots, continuous casting slabs have high production efficiency and good quality. However, due to the limitation of continuous casting slab thickness, it is very difficult to produce rack steel plates with continuous casting slabs in China. Generally, the maximum thickness can only reac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/16C22C33/04C21D8/02
Inventor 马兴云赵乾孙卫华成小龙崔健
Owner JIGANG GRP
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