Method for smelting stainless steel by high-chrome melt and dephosphorized pre-melt

A pre-melt and stainless steel technology, applied in the field of smelting stainless steel, can solve the problem of high power consumption, achieve the effects of less power consumption, shorten the smelting time of the electric furnace, and reduce the smelting task of the electric furnace

Inactive Publication Date: 2012-11-07
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

The existing method of using high-chromium melt and dephosphorization pre-melt to smelt stainless steel is mainly to melt high-carbon ferrochrome in an int

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The type of steel smelted in this embodiment is SUS304, the capacity of the intermediate frequency furnace is 50 tons, the capacity of the AOD is 180 tons, and the capacity of the LTS treated steel ladle is 180 tons. In the JISG4304-2005 standard, the mass percentage ratio of the composition of the steel grade is:

[0036] C ≤0.08%; Si ≤1.0%; Mn ≤2.0%; P ≤0.045%;

[0037] S ≤0.030%; Cr 18.00%~20.00%; Ni 8.00%~10.50%;

[0038] The rest is Fe and unavoidable impurities.

[0039] Ⅰ Medium frequency induction furnace melts high chromium raw material into high chromium melt

[0040] 40 tons of high-chromium ferrochrome (solid state) and 5 tons of production scrap steel are melted in an intermediate frequency furnace, and the mass percentage of the composition of high-chromium ferrochrome is:

[0041] C 8% Si 1.5% Cr 55%

[0042] The rest Fe and unavoidable impurities.

[0043] Production scrap is returned scrap and outsourced scrap with uniform composition. Scrap is ...

Embodiment 2

[0072] The type of steel smelted in this embodiment is 06Cr17Ni12Mo2, the capacity of the intermediate frequency furnace is 50 tons, the capacity of AOD is 180 tons, and the capacity of LTS and LF furnaces is 180 tons. The mass percentage ratio of the composition of the steel grade in the national standard is:

[0073] C ≤0.08%; Si ≤1.0%; Mn ≤2.0%; P ≤0.040%;

[0074] S ≤0.030%; Cr 16.00%~18.00%; Ni 10.00%~14.00%;

[0075] Mo 2.00%~3.00%

[0076] The rest is Fe and unavoidable impurities.

[0077] Ⅰ Medium frequency induction furnace melts high chromium raw material into high chromium melt

[0078] 40 tons of high-chromium ferrochrome (solid state) and 5 tons of production scrap steel are melted in an intermediate frequency furnace, and the mass percentage of the composition of high-chromium ferrochrome is:

[0079] C 8% Si 1.5% Cr 55%

[0080] The rest Fe and unavoidable impurities.

[0081] Production scrap is returned scrap and outsourced scrap with uniform composi...

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Abstract

The invention relates to a method for smelting stainless steel by high-chrome melt and dephosphorized pre-melt. The method includes the steps of I, melting high-chrome material in an medium frequency induction furnace to obtain high-chrome melt; II, using an electric furnace to provide dephosphorized pre-melt; III, adding mixture of the high-chrome melt and the dephosphorized pre-melt for AOD (argon oxygen decarburization); IV, slagging in an LTS (ladle treatment station); V, adjusting alloy composition, slagging and refining by the LTS or an LF (ladle furnace); and VI continuous casting. By the method, whole-line metal yield is increased, yield of chrome is increased from 93% to 96%, average AOD smelting time is shortened by 10 minutes, and power consumption is low.

Description

technical field [0001] The invention relates to a method for smelting stainless steel by using a high-chromium melt and a dephosphorized pre-melt. Background technique [0002] The use of electric energy to melt stainless steel raw materials is an important process for smelting stainless steel. It can provide industrial production equipment for stainless steel mother liquor, including industrial frequency furnaces, intermediate frequency furnaces, and electric arc furnaces. Now stainless steel steelmaking plants generally use electric arc furnaces. The electric arc furnace smelting stainless steel raw materials has long smelting time, low metal yield, heavy dust pollution and low efficiency, which is an important link restricting industrial continuous production. The main raw materials of stainless steel are chromium alloys, nickel-based alloys, and stainless steel scraps, which are mixed according to different smelting steel types. Chromium-based alloys are mainly high-ca...

Claims

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Application Information

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IPC IPC(8): C21C5/52C21C7/068C21C7/00
Inventor 邢继彬刘亮任选马骏鹏常国栋
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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