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High-chromium steel and manufacturing method thereof

A manufacturing method and high-chromium steel technology, applied in the field of high-chromium steel and its manufacture, can solve the problems of lower molten steel temperature, increased production cost of high-chromium steel, unfavorable molten steel treatment, etc., so as to improve yield and prevent molten steel temperature Reduced effect

Inactive Publication Date: 2014-12-31
PANGANG GRP PANZHIHUA STEEL & VANADIUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method of adding a large amount of ferrochrome during the tapping process will cause the temperature of molten steel to drop sharply, which is not conducive to the subsequent treatment of molten steel.
In addition, in order to reduce the impact of adding a large amount of ferrochrome on the temperature of molten steel, expensive low-carbon ferrochrome is usually added during the tapping process, resulting in an increase in the production cost of high-chromium steel, and low-carbon ferrochrome is added during the tapping process Limited contribution to preventing sharp drop in molten steel temperature

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0036] The semi-steel after vanadium-extracted low-sulfur vanadium-containing titanium hot metal is used as raw material for primary molten steel, wherein the semi-steel contains 3.70% of C, 0.05% of Mn, 0.068% of P, 0.0045% of S, 0.033% V and traces of Cr, Si and Ti, the balance being iron and unavoidable impurities.

[0037] Put 140 tons of the above-mentioned semi-steel into a 120-ton (nominal capacity) top-bottom combined blowing converter, and use the function of the top-bottom combined blowing converter to blow oxygen and decarburize the above-mentioned semi-steel into molten steel. When the molten steel is initially smelted to a C content of 0.040%, a Mn content of 0.033%, a P content of 0.0030%, a S content of 0.0052%, and a temperature of 1688°C, the slag is blocked and tapped into the ladle.

[0038] During the tapping process, add 4.5kg / ton of high alkalinity refining slag and 2.3kg / ton of aluminum-iron deoxidizer into the ladle, and add alloy materials into the lad...

example 2

[0046] The semi-steel after vanadium-extracted low-sulfur vanadium-containing titanium hot metal is used as raw material for primary molten steel, wherein the semi-steel contains 3.66% of C, 0.045% of Mn, 0.077% of P, 0.0033% of S, 0.031% V and traces of Cr, Si and Ti, the balance being iron and unavoidable impurities.

[0047] Put 140 tons of the above-mentioned semi-steel into a 120-ton (nominal capacity) top-bottom combined blowing converter, and use the function of the top-bottom combined blowing converter to blow oxygen and decarburize the above-mentioned semi-steel into molten steel. When the molten steel is initially smelted until the C content is 0.043%, the Mn content is 0.032%, the P content is 0.0035%, the S content is 0.0037%, and the temperature is 1677°C, the slag is blocked and tapped into the ladle.

[0048] During the tapping process, add 4.5kg / ton of high alkalinity refining slag and 2.5kg / ton of aluminum-iron deoxidizer into the ladle, and add alloy material...

example 3

[0056] The semi-steel after vanadium-extracted low-sulfur vanadium-containing titanium hot metal is used as raw material for primary molten steel, wherein the semi-steel contains 3.65% of C, 0.04% of Mn, 0.072% of P, 0.0042% of S, 0.031% V and traces of Cr, Si and Ti, the balance being iron and unavoidable impurities.

[0057]Put 140 tons of the above-mentioned semi-steel into a 120-ton (nominal capacity) top-bottom combined blowing converter, and use the function of the top-bottom combined blowing converter to blow oxygen and decarburize the above-mentioned semi-steel into molten steel. When the molten steel is initially smelted to a C content of 0.045%, a Mn content of 0.031%, a P content of 0.005%, a S content of 0.0035%, and a temperature of 1688°C, the slag is blocked and tapped into the ladle.

[0058] During the tapping process, add 4.5kg / ton of high alkalinity refining slag and 2.4kg / ton of aluminum-iron deoxidizer into the ladle, and add alloy materials into the ladle...

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PUM

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Abstract

The invention provides high-chromium steel and a manufacturing method thereof. The manufacturing method comprises the following steps: (a) performing primary melting of molten steel; (b) discharging steel from a ladle when the C content in the molten steel is 0.04%-0.10%, the P content is not more than 0.010 and the S content is not more than 0.008%; (c) during the steel discharge process, adjusting the Cr content of the molten steel to be 1.8%-2.5% and adjusting the oxygen content of the molten steel to be not more than 0.005%; (d) adjusting the oxidizability level of the ladle slag to not more than 1%; (e) refining the molten steel in a ladle refining furnace, and adjusting the Cr content to be 2.7%-3.0% and the S content to be not more than 0.003%; (f) performing calcification treatment on the molten steel; (g) performing circulated vacuum degassing treatment on the molten steel and adjusting the Cr content of the molten steel to be 2.8%-3.2%; and (h) performing calcification treatment on the molten steel, to obtain high-chromium steel. According to the invention, the manufacturing method of high-chromium steel can prevent molten steel temperature drop caused by alloying resulting from excessive amount of ferrochrome iron, and can increase the chromium yield by repeatedly feeding ferrochrome iron.

Description

technical field [0001] The invention relates to a high-chromium steel and a manufacturing method thereof. Background technique [0002] High chromium steel has many advantages, for example, high chromium steel with a chromium content of about 3% has anti-C0 2 、H 2 S and other acid gases can be used as steel for oil casing. [0003] The above-mentioned high chromium steel is usually obtained by alloying by adding ferrochrome during the steel smelting and tapping process. Due to the high chromium content in high chromium steel, a large amount of ferrochromium needs to be added during the tapping process. However, this method of adding a large amount of ferrochrome during the tapping process will cause the temperature of the molten steel to drop sharply, which is not conducive to the subsequent treatment of the molten steel. In addition, in order to reduce the impact of adding a large amount of ferrochrome on the temperature of molten steel, expensive low-carbon ferrochrome...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/28C21C7/00C21C7/10
Inventor 郭奠荣陈亮李清春杨森祥曾耀先陈天明黄德胜解明科
Owner PANGANG GRP PANZHIHUA STEEL & VANADIUM
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