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Method for smelting stainless steel with high chrome melts and dephosphorized melted iron

A technology for dephosphorizing hot metal and stainless steel, which is applied in the field of smelting stainless steel, can solve the problems of high yield, increased process, and short smelting time, and achieve the effects of solving heat shortage, facilitating industrial production, and stabilizing furnace conditions

Active Publication Date: 2014-11-05
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The stainless converter process has low consumption, short smelting time and high yield, which is conducive to industrial production; but there are also disadvantages of increased power consumption and increased processes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The type of steel smelted in this embodiment is SUS430, the capacity of the intermediate frequency furnace is 50 tons, and the capacity of the AOD is 180 tons. In the JISG4312 standard, the mass percentage ratio of the composition of the steel grade is:

[0042] C≤0.12%; Si≤0.75%; Mn≤1.0%; P≤0.04%; S≤0.03%;

[0043] Cr 16.00% ~ 18.00%; the rest is Fe and unavoidable impurities.

[0044] Ⅰ Intermediate frequency furnace melts high chromium raw materials into high chromium melt

[0045] 45 tons of high-carbon ferrochrome are melted in an intermediate frequency furnace; the mass percent of the composition of high-carbon ferrochrome is:

[0046] C 8%; Si 1.5%; Cr 60%;

[0047] The rest is Fe and unavoidable impurities;

[0048] The amount of iron tapping is 45t; the tapping temperature of the intermediate frequency furnace reaches 1670°C.

[0049] Ⅱ Converter provides dephosphorized hot metal

[0050] The mass percent of the composition of dephosphorized molt...

Embodiment 2

[0064] The type of steel smelted in this embodiment is SUS430, the capacity of the intermediate frequency furnace is 50 tons, and the capacity of the AOD is 180 tons. In the JISG4312 standard, the mass percentage ratio of the composition of the steel grade is:

[0065] C≤0.12%; Si≤0.75%; Mn≤1.0%; P≤0.04%; S≤0.03%;

[0066]Cr 16.00% ~ 18.00%; the rest is Fe and unavoidable impurities.

[0067] Ⅰ Intermediate frequency furnace melts high chromium raw materials into high chromium melt

[0068] 40 tons of high-carbon ferrochrome and 5 tons of scrap steel are melted in an intermediate frequency furnace; the mass percent of the composition of high-carbon ferrochrome is:

[0069] C 8%; Si 1.5%; Cr 55%;

[0070] The rest is Fe and unavoidable impurities;

[0071] The mass percent of present embodiment steel scrap is:

[0072] C 0.05%; Si 0.8%; Cr 18.1%; Ni 8%;

[0073] The rest is Fe and unavoidable impurities.

[0074] The tapping temperature of the intermediate frequency f...

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Abstract

The invention relates to a method for smelting stainless steel with high chrome melts and dephosphorized melted iron. The method includes the steps that a medium frequency induction furnace melts high carbon ferro chrome into high chrome melts; a converter provides the dephosphorized melted iron; the high chrome melts and the dephosphorized melted iron provided by the converter are mixed and added into an argon oxygen decarburization (AOD) refining furnace for decarburization, argon blowing and refining; a low temperature shift (LTS) furnace heats the mixture and components are adjusted; and continuous casting is performed. The method is short in smelting time and the consumption of auxiliary materials is low.

Description

technical field [0001] The invention relates to a method for smelting stainless steel with high chromium melt and dephosphorized molten iron. Background technique [0002] The use of dephosphorized hot metal to smelt stainless steel is a technology developed in recent years. Its main feature is to use blast furnace hot metal to smelt stainless steel in a stainless converter after dephosphorization. The production processes that can provide dephosphorized molten iron for stainless steel converters include dephosphorization at three dephosphorization stations, KR dephosphorization, BOF dephosphorization, and electric arc furnace dephosphorization. The smelting of stainless steel in dephosphorized hot metal in the stainless steel converter mainly has technical difficulties such as adding too much solid cold material, difficult process control, and high consumption. Its main alloy cold materials are chromium alloy, copper alloy and so on. The method of smelting stainless steel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/06C22C38/18
Inventor 邢继彬刘亮马骏鹏常国栋
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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