Control method for nano-scaled precipitate in thick steel plate for high heat input welding

A large input energy welding and control method technology, which is applied in the field of smelting thick steel plates for large input energy welding, can solve the problems of not being able to well inhibit the growth of austenite grains, growth, and large particle sizes. Achieve the effect of improving the welding performance of large heat input, increasing the yield rate, and the effect is obvious
CN102296147BActive Publication Date: 2012-10-10BAOSHAN IRON & STEEL CO LTD
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
BAOSHAN IRON & STEEL CO LTD
Publication Date
2012-10-10

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Abstract

The invention discloses a control method for a nano-scaled precipitate in a thick steel plate for high heat input welding. Deoxidizers are added during smelting and casting of molten steel, wherein the types and the adding sequence for the deoxidizers are that: (Mn+Si), Al, Ti and (Ca+Mg); Mg content is 0.0005-0.007 percent; oxygen level in the molten steel is required to be adjusted during Mg deoxidization; accurate control is performed by adding Fe2O3 powder into a cast ingot casting mould; the amount of added Fe2O3 powder is 0.001-0.008 percent of oxygen content in the molten steel; the volume density of the precipitates of less than 500nm in steel is more than 9.0*107 per cubic millimeter; the average particle size is less than 80.0nm; and the proportion of the precipitates of less than 100nm is more than 75 percent. A large number of nano-scaled precipitates with small sizes are formed by the method and are finely dispersed and distributed in the steel; suppression of austenite grain growth of a welding heat affected zone is facilitated; and the high heat input welding performance of the thick plate is improved.
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Description

technical field

[0001] The invention relates to the smelting technology of a thick steel plate for high-energy-input welding, in particular to a method for controlling nano-precipitates in a thick steel plate for high-energy-input welding. Background technique

[0002] In many fields such as shipbuilding, construction, pressure vessels, oil and gas pipelines, and offshore platforms, improving the toughness of the heat-affected zone of thick steel plate welding has become an increasingly urgent requirement. However, in the welding process of traditional thick steel plates, the strength and toughness of the heat-affected zone of welding decrease significantly with the increase of welding input energy, so improving the high input energy welding performance of thick plates has become a subject of concern. Improving the large heat input welding performance of thick steel plates can not only improve the operating efficiency of shipbuilding, construction, pipeline and other industr...

Claims

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