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Method for producing tough high chromium ferritic alloy

A high-chromium ferrite and production method technology, applied in the smelting of denitrification and decarburization of ultra-pure ferritic stainless steel, can solve the problems of high brittle transition temperature, low room temperature toughness, harmful ferritic stainless steel, etc., and achieve Small argon gas consumption, short smelting time, and less spatter

Inactive Publication Date: 2009-09-23
JIANGSU XIHU SPECIAL STEEL
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Problems solved by technology

[0002] Ferrite exists C and N interstitial elements in stainless steel to strongly form and stabilize austenite, which is very harmful to ferritic stainless steel, mainly because the diffusion speed of C and N elements in ferritic stainless steel is fast, about 600 times that of the ferritic stainless steel, carbon and nitride precipitates during the cooling process after high temperature heating, resulting in ferritic stainless steel brittleness at 475 ° C, high temperature brittleness, low room temperature toughness, high brittle transition temperature, and sensitivity to notches, etc. shortcoming

Method used

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Examples

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Embodiment Construction

[0019] The production method of the ductile high-chromium ferritic alloy of the present invention will be described in detail below in conjunction with the examples, but the specific implementation of the decarburization and denitrogenation method of the present invention is not limited to the following examples.

[0020] 1. Selection and processing of raw materials: The mass percentage of Al in the selected cast pure iron (or hot-rolled pure iron) and metal Cr is controlled below 0.05, the purpose of which is to make the carbon-oxygen reaction more fully during the melting period and prevent Al content Higher levels inhibit carbon-oxygen reactions during melting. The pure iron bar with oxide skin on the surface is not rolled, and the mass percentage of the oxygen content of pure iron and metal Cr is controlled below 0.1, resulting in oxygen-enriched molten steel during the melting period and refining period, which is beneficial to the decarburization of the carbon-oxygen react...

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Abstract

The invention discloses a method for producing tough high chromium ferritic alloy, which comprises the following steps: 1) raw material selection; 2) technological processes: a, vacuum melting; b, high-temperature vacuum refining; c, reductive slagging; d, temperature reduction and solidification; e, temperature rise and deoxidation; f, quenching and tempering and homogenization; and g, casting ingots. The method can reduce the end points C and N contents of liquid steel to below 100 ppm through the steps. The method has the advantages of simple process, short melting time, less short splash and less argon consumption. The product produced by the method not only has excellent corrosion resistance, but also has good toughness.

Description

technical field [0001] The invention relates to a smelting method for decarburization and denitrogenation of ultra-pure ferritic stainless steel. Background technique [0002] Ferrite exists C and N interstitial elements in stainless steel to strongly form and stabilize austenite, which is very harmful to ferritic stainless steel, mainly because the diffusion speed of C and N elements in ferritic stainless steel is fast, about 600 times that of the ferritic stainless steel. During the cooling process after high temperature heating, carbon and nitride will precipitate out, resulting in ferritic stainless steel brittleness at 475 ° C, high temperature brittleness, low room temperature toughness, high brittle transition temperature, and sensitivity to notches, etc. shortcoming. Therefore, metallurgists have long been committed to reducing the carbon and nitrogen content in ferritic stainless steel, so as to overcome the above-mentioned shortcomings of ferritic stainless steel....

Claims

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Application Information

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IPC IPC(8): C21C7/072C21C7/076C21C7/06C21C7/068
CPCY02P10/20
Inventor 翟世先徐华翟海平翟华平翟玉亭
Owner JIANGSU XIHU SPECIAL STEEL
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