Smelting method for medium-carbon stainless steel

A medium-carbon stainless steel and smelting method technology, applied in the field of special steel smelting, can solve the problems of low recovery rate of chromium in molten steel, serious phosphorus reversion, and inability to guarantee the quality and performance of steel plates, so as to reduce production costs and reduce carbon content. , the effect of shortening the smelting cycle

Inactive Publication Date: 2009-02-18
WUYANG IRON & STEEL
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  • Summary
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  • Claims
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AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for smelting medium-carbon stainless steel, especially stainless steel WSM136A, which can overcome the problems of low chromium recovery rate in molten steel, serious phosphorus return after refining slag, and unguaranteed quality and performance of steel plates

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Taking the 08101765 furnace as an example to smelt the steel grade WSM136A, the chromium composition requirement of the steel grade is 12.70-13.50%. The smelting cycle of the electric furnace is 55min, [P]0.008% after tapping, and the tapping amount is 94.3t. There was no oxidation slag in the ladle when the steel was tapped, the temperature of the ladle was 1627°C, and the argon blowing of the ladle was good. After the seat ladle is refined, the ladle is well blown with argon, and the temperature rises to 1647°C. Add 6t of chromium (59% chromium) in the first batch of alloy. After the alloy is completely melted, add 8 tons of chromium in the second batch of alloy. Melt, add 6 tons of low-chromium of the third batch of alloy (chromium composition is 63%) and 6 tons of low-chromium of the fourth batch of alloy again, totally 26 tons of alloys, the time interval of adding ferrochrome at every turn is 12min. After heating up and blowing argon several times and stirring, t...

Embodiment 2

[0017] There is no oxide slag in the ladle when the electric furnace is melting and tapping, the temperature of the ladle is 1620°C, and the argon blowing of the ladle is good. After the seat ladle is refined, the ladle is well blown with argon, and the temperature rises to 1630°C. Add 5t of chromium (59% chromium) in the first batch of alloy. After the alloy is completely melted, add the chromium in the second batch and the third batch of alloy respectively. 5 tons each, and then through heating and melting, add 5 tons of the fourth batch and the fifth batch of alloy low chromium (chromium composition is 63%), a total of 25 tons of alloys, and the time interval of adding ferrochrome each time is 10min. Others are the same as embodiment 1.

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PUM

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Abstract

The invention relates to a smelting method of medium carbon stainless steel. The method includes steps of electric furnace smelting and refining and vacuum processing. During the electric furnace smelting, the tapping P is controlled not larger than 0.015 percent; the electric furnace outputs the steel without slag; the temperature of a large ladle is controlled between 1580 DEG C and 1630 DEG C; the ladle is excellent in argon blowing; after a stationary ladle is refined, the temperature of the molten steel is raised simultaneously when deoxidation and the temperature is controlled between 1580 DEG C and 1650 DEG C; ferrochrome iron is added by 4 to 6 batches; during the refining process, large argon blowing is carried out until the alloy is completely smelt and uniformed, the other components are adjusted to the target values; the slag amount is enlarged during refining, white slag is maintained; then the medium carbon stainless steel is obtained through post treatment. In the method, the chromium recycling rate of the molten steel can reach more than 97 percent; the [P] content of the molten steel is controlled within 0.015 percent. Simultaneously the method is simply operated, convenient and practical, reduces the smelting difficulty, shortening the smelting period and reducing the production cost; besides, the method has a certain reference meaning to the smelting of a plurality of steel with high alloy.

Description

(1) Technical field [0001] The invention belongs to the field of special steel smelting, in particular to a method for smelting medium-carbon stainless steel. (2) Background technology [0002] Medium-carbon stainless steel refers to stainless steel with a carbon content of 0.25-0.35%, which is suitable for making various parts such as precision plastic molds, rubber molds and industrial machines used in weak acid and humid conditions. At present, the process of smelting medium-carbon stainless steel is to add high chromium and medium chromium to adjust the composition of molten steel during electric furnace smelting. When tapping the steel, the molten steel and slag are removed, and then the alloy is added to the refining position to fine-tune the composition. However, the disadvantage of this process is that The loss of alloy is large, the chromium recovery rate of molten steel is less than 70%, and the electric furnace smelting time is long, which has a great impact on th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/00
Inventor 任荣夏保卫林建农
Owner WUYANG IRON & STEEL
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