Manufacture method for cold-crack and high sensibility ultra-thick steel plate

A technology of extra-thick steel plate and production method, which is applied in the field of metallurgy, can solve the problems of single application field, etc., and achieve the effects of simple production process, wide preheating temperature range and short construction period

Inactive Publication Date: 2013-04-10
ANGANG STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This invention (publication number CN 1962153A) adopts an electron beam welding torch to carry out preheating and two times of welding, although the middle adopts without vacuum insulation treatment, but the application field is single

Method used

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  • Manufacture method for cold-crack and high sensibility ultra-thick steel plate
  • Manufacture method for cold-crack and high sensibility ultra-thick steel plate

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Embodiment Construction

[0018] Below in conjunction with embodiment the present invention is described in further detail:

[0019] 1. 12Cr2Mo1R steel is a steel used in the manufacture of special equipment such as hydrogenation reactors and high-pressure heat exchangers. Due to the high carbon content of this steel and the large content of alloying elements, the carbon equivalent is very large, and the finished steel plate is required. The thickness is very large, and it is easy to produce cold cracks during welding, so it must be preheated before welding. In this embodiment, two continuous casting slabs are selected for surface treatment. The welding surface is the outer arc surface of the continuous casting slab, with a roughness of 6.3 μm or more, a side surface of 12.5 μm, and a flatness of 0.8 mm / mm. 2 , and then align the welding surfaces of two blanks with a thickness of 250mm, a length of 4000mm and a width of 2300mm and push them into the vacuum chamber for preheating welding. Vacuum degree...

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Abstract

The invention discloses a manufacture method for a cold-crack and high sensibility ultra-thick steel plate. In a vacuum environment, a cold-crack welded sensibility steel plate with a carbon equivalent less than or equal to 0.61 percent is preheated and welded by a dual-electron-beam distribution method, and an ultra-thick steel plate is manufactured by heating and rolling. According to the manufacture method, the scope of a pre-heating temperature is wide, a temperature decrease is extremely small, no cold cracks come out on a welded ultra-thick blank, the manufacture process is simple, the working period is short, the method is suitable for industrial large-scale production, and remarkable economic and social benefits can be brought.

Description

technical field [0001] The invention relates to a production method of an extra-thick steel plate with a thickness of 100 mm to 300 mm, in particular to a production method of a steel plate with high sensitivity to cold cracks, and belongs to the field of metallurgy. Background technique [0002] As an important basis for evaluating the welding performance of steel, the sensitivity of cold cracks has been widely concerned by workers in the metallurgical industry. Generally, the stronger the cold crack sensitivity of the steel, the greater the tendency to appear cold cracks after welding. This type of steel needs to be preheated before welding. The stronger the sensitivity, the higher the preheating temperature, especially the carbon equivalent. More than 0.61% steel grades. Therefore, in order to avoid cold cracks after welding when developing new steel types, designers generally adopt the composition design concept of low carbon, low alloy, and low carbon equivalent. Howe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00B23K15/06B21B1/38
Inventor 高强王文仲王储敖列哥梁福鸿胡昕明
Owner ANGANG STEEL CO LTD
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