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A kind of preparation method of microalloyed medium carbon steel casting

A technology of microalloying, medium carbon cast steel, applied in the field of iron and steel material processing, can solve the problems of insufficient attention and amplify the adverse effects of precipitation of microalloying elements, and achieve reduced inclusion content, uniform microstructure, high strength and toughness. and the effect of hardness

Active Publication Date: 2020-12-29
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One of the reasons can be attributed to the lack of attention to the influence of the shape and distribution of non-metallic inclusions in cast steel on the quality of cast steel, the lack of metallurgical control, and the adverse effects of precipitation of microalloying elements on toughness. The adverse effect of "1+1>2", that is, uncontrolled inclusions further amplify the adverse effect of precipitation of microalloying elements on toughness

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The present embodiment prepares microalloyed medium carbon steel castings according to the following steps:

[0027] (1) The chemical composition and mass percentage of molten steel for electric arc furnace melting are: C: 0.31%; Si: 0.82%; Mn: 1.32%; P: 0.015%; S: 0.011%; Nb: 0.06%; the rest is Fe , and the molten steel at a temperature of 1620°C is discharged into the ladle; when the molten steel is fully injected into the ladle and its temperature is 1608°C, the aluminum cored wire with a diameter of 8.0mm is fed into the ladle for final deoxidation of the molten steel, and its aluminum The speed of the cored line is 0.8m / s, and the feeding amount is 0.4kg / t. When the residual aluminum content of ladle molten steel is 0.038%, carry out the inclusion spheroidization treatment of feeding silicon-calcium-rare earth cored wire, the diameter of the cored wire is 8.0mm, and the feeding amount of the cored wire is 1.9kg / t, Feeding speed is 2.0m / s. When feeding the wire, b...

Embodiment 2

[0032] The present embodiment prepares microalloyed medium carbon steel castings according to the following steps:

[0033] (1) The chemical composition and mass percentage of molten steel for induction furnace melting are: C: 0.29%; Si: 0.79%; Mn: 1.5%; P: 0.011%; S: 0.012%; V: 0.10%; Ti: 0.025% The rest of the molten steel with Fe content and a temperature of 1612°C is discharged into the ladle; when all the molten steel is poured into the ladle and its temperature is 1602°C, then an aluminum cored wire with a diameter of 8mm is fed into the ladle for final deoxidation of the molten steel , the aluminum cored line speed is 0.9m / s, and the feed rate is 0.3kg / t. When the residual aluminum content of ladle molten steel is 0.025%, carry out the inclusion modification treatment of feeding silicon-calcium-rare earth cored wire, the cored wire diameter is 6mm, the feeding amount of cored wire is 1.8kg / t, and the aluminum wire The speed is 2.1m / s. When feeding the wire, blow argon g...

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Abstract

The invention provides a preparation method of a microalloyed medium carbon steel casting, belonging to the technical field of steel material processing. The preparation method is characterized by comprising the following steps of carrying out final deoxidation of feeding an aluminum-clad core wire, spheroidizing modification of inclusions of feeding a silicon-calcium-rare earth core wire, and homogenizing and tempering the cast steel casting in a steel ladle on microalloyed medium carbon cast steel molten steel smelted by an electric arc furnace or an induction furnace. The microalloyed medium carbon steel casting prepared by the treatment has fine and uniform microstructure and small inclusion size, is mainly spherical in shape and is in dispersed distribution. The structure characteristics ensure that the steel casting has good toughness and higher hardness and wear resistance. Thus, the wire feeding treatment is beneficial to further improvement of the performance of the microalloyed medium carbon cast steel, and the toughness reduction of the medium carbon cast steel after microalloying elements are added is reduced. The steel casting can be used for structural members with higher requirements for toughness and wear resistance. The popularization and application have favorable social and economic benefits.

Description

technical field [0001] The invention relates to a method for preparing a micro-alloyed medium-carbon steel casting, belonging to the technical field of steel material processing. Background technique [0002] Microalloyed steel castings are mainly prepared by designing appropriate alloy components (adding one or several microalloying elements such as Nb, Ti, V), controlling solidification process and heat treatment. [0003] The carbon content of micro-alloyed low-carbon cast steel is generally not higher than 0.20%. Due to the low carbon content, the toughness mechanism of micro-alloyed elements to refine grains and precipitation strengthening can be fully utilized, so the cast steel can improve the strength of castings. While ensuring good welding and casting performance while maintaining toughness, it has been widely used in industries such as mining, machinery, transportation, building materials, electric power and national defense to replace ordinary steel castings. The...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/12C22C38/14C21C7/06C21C7/00C21D1/18
CPCC21C7/0056C21C7/06C21D1/18C22C38/02C22C38/04C22C38/12C22C38/14
Inventor 张永军刘庆华宋智丽乔燕芳金培武刘成吴立忠王进军李想李新鹏韩静涛
Owner UNIV OF SCI & TECH BEIJING