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.
CN101476018BActive Publication Date: 2011-03-02SHOUGANG CORPORATION
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SHOUGANG CORPORATION
Publication Date
2011-03-02

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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.
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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...

Claims

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