Method for improving toughness of high-carbon equivalent steel plate welding heat affected zone through rare earth
A welding heat-affected zone and high carbon equivalent technology, which is applied in the direction of improving process efficiency and manufacturing converters, can solve problems such as easy aggregation and growth, and achieve the effect of inhibiting grain growth and improving performance
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[0032] The present invention will be further described below in conjunction with the embodiments.
[0033] The invention discloses a method for improving the toughness of the welding heat affected zone of a high carbon equivalent steel plate by using rare earth. Among them, the refining outside the furnace adopts the LF+vacuum degassing / RH process route, and adding rare earth alloys during the RH refining process, thereby newly forming fine and dispersed Ce inclusions containing rare earths and original inclusions modified by rare earths in the molten steel . These inclusions inhibit the growth of pre-austenite grains in the heat-affected zone during the welding process. At the same time, the addition of rare earth also delays the transformation of bainite in the heat-affected zone and inhibits the formation of upper bainite, thereby greatly increasing the height The toughness of the heat-affected zone of carbon equivalent thick plate welding.
[0034] Research on improving the i...
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