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Method for improving steel plate heat-affected zone toughness of steel plate under high input energy welding condition

A technology for high-energy welding and heat-affected zone, applied in the field of high-strength steel plates for welding, can solve the problems of increasing the cracking tendency of grain boundaries, decreasing the toughness of the base metal, and increasing the dislocation density, and achieving the effect of improving the toughness.

Active Publication Date: 2011-03-02
SHOUGANG CORPORATION
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Problems solved by technology

However, the addition of B has no good control measures at present, and B is easy to form carbides and nitrides, and it is easy to gather at the austenite grain boundary, which increases the dislocation density here, becomes a hydrogen trap, and increases the tendency of grain boundary cracking , resulting in a serious decrease in the toughness of the base metal

Method used

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  • Method for improving steel plate heat-affected zone toughness of steel plate under high input energy welding condition
  • Method for improving steel plate heat-affected zone toughness of steel plate under high input energy welding condition
  • Method for improving steel plate heat-affected zone toughness of steel plate under high input energy welding condition

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Embodiment Construction

[0024] The present invention will be described below by comparing various examples and comparative examples. These examples are for explanatory purposes only, and the present invention is not limited to these examples.

[0025] Table 1 is the chemical composition of each steel type in the examples and comparative examples. Table 2 shows the conventional mechanical properties of various steel types in Examples and Comparative Examples. Table 3 shows the series temperature shock results of various steel types in the examples and comparative examples. Table 4 shows the welding heat simulation and actual welding impact absorbed energy of the examples and comparative examples.

[0026] The chemical composition of each steel grade in the embodiment of table 1 and comparative example

[0027]

[0028] The conventional mechanical properties of each steel grade in the embodiment of table 2 and comparative example

[0029]

[0030]

[0031] The series temperature impact res...

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Abstract

The invention pertaining to the technical field of high-strength steel plates for welding provides a method of improving the heat-affected zone toughness of a steel plate under a large heat input welding condition.CGHAZ toughness of a steel plate under a large heat input welding condition is improved on the basis of a CaO-MnS mechanism.HAZ toughness can be improved effectively by adding Ca into C-Mn steel, wherein, the Ca performs deoxidization through a gas-liquid interface for generating reactions of [Ca]+[O]=(CaO) and [Ca]+[S]=(CaS); fine dispersed nano-scale mass points of CaO and CaS areformed, MnS adheres to the mass points go grow to form a rotundity shape, and when the Ca content achieves to 50-60ppm, the HAZ toughness can be improved effectively.The invention has advantages of effective austenite grain boundary forming by nails, grains being fined and the CGHAZ toughness being improved.

Description

technical field [0001] The invention belongs to the technical field of high-strength steel plates for welding, and in particular provides a method for improving the toughness of heat-affected zones under the condition of large heat input welding. It is suitable for high-strength steel plates used in shipbuilding, bridges, high-rise buildings, and large-scale oil storage tanks. In the range of welding line energy ≥ 50KJ / cm, it can effectively improve the welding heat affected zone (Heat Affected Zone, Hereinafter referred to as HAZ) toughness method. technical background [0002] In recent years, in the construction of large structures such as ships, bridges, high-rise buildings, and large oil storage tanks, the use of low-carbon low-alloy high-strength steel has become increasingly widespread. In order to improve construction efficiency and reduce costs, large heat input welding technologies such as single-sided welding and double-sided forming submerged arc automatic weldi...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04C21C7/06
Inventor 金茹朱伏先姜中行肖桂枝沈一平刘建明张朋彦隋鹤龙吴斌闫智平吕延春宋增强白学军刘晓辉张跃飞
Owner SHOUGANG CORPORATION
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