A kind of production method of low carbon and high chromium steel

A low-carbon and high-chromium production method technology, applied in the field of iron and steel metallurgy, can solve the problems of large heat loss, long heating time, difficult process temperature control, etc., and achieve the effect of good effect and simple operation.

Active Publication Date: 2015-11-18
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, compared with the production process of the converter, the main problems faced by the production of low-carbon high-chromium steel are temperature control and carbon content control of the steel, because when the converter is used to smelt high-chromium steel, the amount of alloy added is large. The amount of ferrochromium alone is about 16 tons. If the method of one-time addition after tapping the converter is adopted, coupled with the influence of the temperature drop of the tapping, the temperature drop of the molten steel will reach more than 120°C, and the heat loss is too large. It is difficult to control the process temperature; at the same time, due to the low carbon content (≤0.03%), the amount of alloy added is large, the heating time is long, and the carburization of the alloy and the carburization of the heating have a great impact on the control of carbon, so general alloys cannot be used steel production process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0025]The semi-steel after vanadium extraction and desulfurization of vanadium-containing titanium hot metal is used as raw material for primary molten steel, wherein the semi-steel contains 3.5% of C, 0.03% of Mn, 0.065% of P, 0.001% of S, 0.034% V and traces of Cr, Si and Ti, the balance being iron and unavoidable impurities.

[0026] Specific steps:

[0027] (1) Put 235 tons of the above-mentioned semi-steel into a 220-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 0.052wt%, a Mn content of 0.033wt%, a P content of 0.0060wt%, a S content of 0.0052wt%, and a Si content of 0.007%, the temperature is 1675°C and the oxygen activity is 630 ×10 -6 , start to stop the slag and tap steel into the ladle.

[0028] (2) During the tapping process, add 43kg / t 钢水 m...

example 2

[0035] The semi-steel after vanadium extraction and desulfurization of vanadium-containing titanium hot metal is used as raw material for primary molten steel, wherein the semi-steel contains 3.3wt% C, 0.032wt% Mn, 0.058wt% P, 0.0015wt% % of S, 0.033wt% of V and traces of Cr, Si and Ti, the balance being iron and unavoidable impurities.

[0036] Specific steps:

[0037] (1) Put 240 tons of the above-mentioned semi-steel into a 220-ton (nominal capacity) top-bottom re-blowing converter, and use the function of the top-bottom re-blowing converter to blow oxygen and decarburize the above-mentioned semi-steel into molten steel. When molten steel is initially smelted to a C content of 0.060wt%, a Mn content of 0.031wt%, a P content of 0.0062wt%, a S content of 0.0051wt%, and a Si content of 0.01%, the temperature is 1672°C and the oxygen activity is 680× 10 -6 , start to stop the slag and tap steel into the ladle.

[0038] (2) During the tapping process, add 48kg / t 钢水 medium ca...

example 3

[0045] The semi-steel after vanadium extraction and desulfurization of vanadium-containing titanium hot metal is used as raw material for primary molten steel, wherein the semi-steel contains 3.6wt% C, 0.03wt% Mn, 0.074wt% P, 0.003wt% % of S, 0.032wt% of V and traces of Cr, Si and Ti, the balance being iron and unavoidable impurities.

[0046] Specific steps:

[0047] (1) Put 234 tons of the above-mentioned semi-steel into a 220-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 molten steel is initially smelted to a C content of 0.042wt%, a Mn content of 0.031wt%, a P content of 0.0070wt%, a S content of 0.0057wt%, and a Si content of 0.009%, the temperature is 1680°C and the oxygen activity is 644× 10 -6 , start to stop the slag and tap steel into the ladle.

[0048] (2) During the tapping process, add 45kg / t 钢...

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PUM

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Abstract

The invention discloses a production method for low-carbon high-chromium steel. The production method comprises the following steps: primarily melting molten steel by adopting a converter, wherein the final tapping temperature is controlled at 1670-1690DEG C, the C content of tapping liquid steel is regulated to be 0.04-0.06wt% and the oxygen activity is regulated to be 600*10<-6> to 700*10<-6>, and ferrochrome alloy is quantitatively added according to a ratio of 40-50kg / t liquid steel in the steel tapping process; performing primary refining to the primarily molten liquid steel in a ladle refining furnace, wherein the ferrochrome alloy is added when the primary refining starts to regulate the content of Cr in the liquid steel to be 3.6-4.0wt%, and the final tapping temperature of the primary refining is controlled to be 1645-1655DEG C; carrying out decarburization treatment to the primarily refined liquid steel in an RH furnace to regulate the content of C to be 0.02% below; then carrying out secondary refining to the decarburized liquid steel in the ladle refining furnace to finally obtain the low-carbon high-chromium steel, wherein the ferrochrome alloy is added when the secondary refining starts to regulate the content of Cr in the liquid steel to be 3.8-4.2wt%, and the final tapping temperature of the secondary refining is controlled to be 1595-1605DEG C. The low-carbon high-chromium steel is obtained by adopting the method.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and more specifically relates to a production method of low-carbon high-chromium steel. Background technique [0002] At present, compared with the production process of the converter, the main problems faced by the production of low-carbon high-chromium steel are temperature control and carbon content control of the steel, because when the converter is used to smelt high-chromium steel, the amount of alloy added is large. The amount of ferrochromium alone is about 16 tons. If the method of one-time addition after tapping the converter is adopted, coupled with the influence of the temperature drop of the tapping, the temperature drop of the molten steel will reach more than 120°C, and the heat loss is too large. It is difficult to control the process temperature; at the same time, due to the low carbon content (≤0.03%), the amount of alloy added is large, the heating time is lon...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/48C22C33/06C21C7/068C21C7/10
Inventor 周伟曾建华陈永干雄陈亮李平凡
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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