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Stainless steel smelting method

A smelting method and stainless steel technology, applied in the field of stainless steel smelting, can solve the problems of performance difference, energy waste, large energy consumption, etc., and achieve the effect of improving ductility and hardness and saving energy.

Active Publication Date: 2017-09-15
SHANXI TAIGANG STAINLESS STEEL CO LTD
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AI Technical Summary

Problems solved by technology

[0002] Due to the shortage of nickel resources, using chromium-nickel alloy pig iron instead of chromium-nickel alloy pig iron to smelt stainless steel is an important mode for the production of stainless steel. The liquid is cold-cut and cast into iron ingots, transported to the stainless steel production plant and then melted, dephosphorized and used. The whole process consumes a lot of energy and is a serious waste of energy. At the same time, its performance is different from that of stainless steel smelted with nickel.

Method used

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Embodiment Construction

[0009] Step 1. After the laterite nickel ore and iron ore are batched, they are smelted in a blast furnace and dephosphorized to generate a chromium-nickel alloy melt, so that the content of the chromium-nickel alloy pig iron liquid is 0.2% by mass and 0.1% silicon. %, phosphorus content ≤ 0.015%, chromium ≈ 1%, nickel ≈ 10.3%, and the rest are iron and inseparable impurities. Keep the temperature so that the temperature of the chromium-nickel alloy pig iron liquid is 50-100 higher than the melting point of the chromium-nickel alloy pig iron liquid Celsius;

[0010] Step 2: Melt high-carbon ferrochrome in an intermediate frequency furnace to generate high-carbon ferrochromium liquid, so that the high-carbon ferrochrome liquid contains carbon ≈ 8%, silicon ≈ 1.5%, phosphorus content ≤ 0.015%, and chromium ≈ 58% according to the mass percentage content , the rest are iron and inseparable impurities, and the temperature is maintained so that the temperature of the high-carbon fer...

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Abstract

The invention relates to the technical field of stainless steel smelting, in particular to a stainless steel smelting method. In the stainless steel smelting method, a liquid chrome-nickel alloy pig iron melt is used directly, links of cooling, conveying and secondary heating after production of chrome-nickel alloy pig iron are omitted, energy consumption is reduced, meanwhile, after the temperature of high carbon ferro-chrome liquid is controlled to be equal to the melting point of the high carbon ferro-chrome liquid, the high carbon ferro-chrome liquid is added in a chrome-nickel alloy pig iron liquid steel ladle in which the temperature of chrome-nickel alloy pig iron liquid is higher than the melting point of the chrome-nickel alloy pig iron liquid by 50-100 DEG C, nickel is adjusted by pure nickel, steel is discharged and cooled after the liquid is stirred for 3-5 minutes, the high carbon ferro-chrome liquid becomes fused floccules due to slightly cold melting point, and after the steel is cooled, the ductility and the hardness of the product are improved.

Description

technical field [0001] The invention relates to the technical field of stainless steel smelting. Background technique [0002] Due to the shortage of nickel resources, using chromium-nickel alloy pig iron instead of chromium-nickel alloy pig iron to smelt stainless steel is an important mode for the production of stainless steel. The liquid is cold-cut and cast into iron ingots, transported to the stainless steel production plant and then melted, dephosphorized and used. The whole process consumes a lot of energy and wastes energy. At the same time, its performance is different from that of stainless steel smelted with nickel. Contents of the invention [0003] The technical problem to be solved by the invention is: how to reduce the energy consumption in the production process of smelting chromium-nickel stainless steel, and at the same time improve the ductility and hardness of the product. [0004] The technical scheme adopted in the present invention is: a kind of st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/04
CPCC22C33/04
Inventor 任选刘亮邢继彬
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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