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A method for smelting high-carbon steel from semi-steel

A high-carbon steel and steel smelting technology, applied in the field of metallurgy, can solve the problems of long slag formation time and poor dephosphorization effect, and achieve the effects of rapid slag formation, avoiding composition fluctuations and reducing production costs

Inactive Publication Date: 2016-01-13
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

[0006] The purpose of the present invention is to overcome the defects of long slagging time and poor dephosphorization effect in the existing semi-steel smelting high-carbon steel method, and provide a method for quickly slagging and good dephosphorization effect of semi-steel smelting high-carbon steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028]The bearing steel GCr15 is smelted with vanadium-extracted semi-steel as raw material.

[0029] In this embodiment, the active lime is the active lime containing 88% by weight of CaO; the high-magnesia lime is the high-magnesia lime containing 50% by weight of MgO and 45% by weight of CaO; the acidic composite slagging agent contains 60% by weight SiO 2 , 15% by weight of CaO, 1% by weight of MgO, 15% by weight of FeO and 1% by weight of Fe 2 o 3 Acidic compound slagging agent.

[0030] The nominal capacity of the steelmaking converter is 120t. The vanadium-extracted semi-steel has a C content of 3.5 wt%, a Si content of 0.01 wt%, a Mn content of 0.04 wt%, a P content of 0.05 wt%, a S content of 0.005 wt%, a temperature of 1300°C, and a weight of 130t.

[0031] (1) Put the vanadium-extracted semi-steel directly into the converter, add 10kg of active lime per ton of steel and 10kg of high-magnesium lime per ton of steel into the converter, then add acidic compound sla...

Embodiment 2

[0034] P72LXB is smelted with vanadium-extracted semi-steel as raw material.

[0035] In this embodiment, the active lime is the active lime containing 88% by weight of CaO; the high-magnesia lime is the high-magnesia lime containing 38% by weight of MgO and 55% by weight of CaO; SiO 2 , 7% by weight of CaO, 3% by weight of MgO, 7% by weight of FeO and 3% by weight of Fe 2 o 3 Acidic compound slagging agent.

[0036] The nominal capacity of the steelmaking converter is 120t. The vanadium-extracted semi-steel has a C content of 3.6 wt%, a Si content of 0.005 wt%, a Mn content of 0.03 wt%, a P content of 0.07 wt%, a S content of 0.015 wt%, a temperature of 1310°C, and a weight of 130t.

[0037] (1) Put the vanadium-extracted semi-steel directly into the converter, add 13kg of active lime per ton of steel and 11kg of high-magnesium lime per ton of steel into the converter, then adjust the slag alkalinity to 3 with an acidic compound slagging agent, and top blow at the same ti...

Embodiment 3

[0040] P82LXA is smelted with vanadium-extracted semi-steel as raw material.

[0041] In this embodiment, the active lime is the active lime containing 85% by weight of CaO; the high-magnesium lime is the high-magnesium lime containing 30% by weight of MgO and 52% by weight of CaO; the acidic composite slagging agent contains 65% by weight SiO 2 , 13% by weight of CaO, 2% by weight of MgO, 10% by weight of FeO and 1% by weight of Fe 2 o 3 Acidic compound slagging agent.

[0042] The nominal capacity of the steelmaking converter is 120t. The vanadium-extracted semi-steel has a C content of 3.65 wt%, a Mn content of 0.04 wt%, a P content of 0.09 wt%, a S content of 0.02 wt%, a temperature of 1317°C and a weight of 130t.

[0043] (1) Put the vanadium-extracted semi-steel directly into the converter, add 15kg of active lime per ton of steel and 12kg of high-magnesium lime per ton of steel into the converter, and then adjust the slag alkalinity to 3.5 with an acidic compound sl...

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Abstract

The invention discloses a method of utilizing semisteel to smelt high-carbon steel. The method comprises the following steps: (1) feeding semisteel to a converter, adding active lime, high-magnesium lime and an acidic compound slagging constituent to the converter, performing top blowing of oxygen and bottom blowing of nitrogen or argon to carry out converting, adjusting the basicity of slag in the converter to be 2.5-3.5, converting for 5-6 minutes, and discarding the slag, wherein the conditions for top blowing of oxygen are that the oxygen supply intensity is 2-3 m<3> per ton of steel per minute, and the oxygen gun position is 2.5-3 m; (2) under the converting condition of top blowing of oxygen and bottom blowing of nitrogen or argon, adding active lime, high-magnesium lime and the acidic compound slagging constituent to the converter again, adjusting the basicity of slag in the converter to be 3-4, and then performing smelting end point control and tapping the steel, wherein the conditions for top blowing of oxygen are as follows: the oxygen supply intensity is 3-3.5 m<3> per ton of steel per minute, and the oxygen gun position is 1.8-2.8 m. The method can effectively dephosphorize, protect carbon, and achieve the high-carbon steel smelting purpose under dephosphorization.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a method for smelting high-carbon steel from semi-steel. Background technique [0002] With the development of industry and technology, various industries have increasingly stringent requirements on the quality of steel. The carbon content and phosphorus content in steel directly affect the quality of steel. There are generally two methods for smelting high-carbon steel in the converter. One is the carburization method, that is, the tapping carbon is low, and the carburizing agent is added to the molten steel during the tapping process to increase the carburization of the molten steel. This method can ensure that the final molten steel has a lower carbon content. Phosphorus content, but the high oxidation of slag will corrode the furnace lining, the high oxygen activity of molten steel will increase the amount of deoxidizer and reduce the yield of alloy, and add a large amoun...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/32C21C5/36
Inventor 陈均曾建华梁新腾杨森祥喻林黄生权陈路李盛
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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