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Method for smelting high-chromium steel and high-chromium steel

A high-chromium steel and high-carbon ferrochrome technology, which is applied in the field of smelting high-chromium steel, can solve the problems of increasing production costs and high prices of low-carbon ferrochrome

Active Publication Date: 2012-05-16
PANGANG GROUP VANADIUM TITANIUM & RESOURCES +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the price of low-carbon ferrochrome is relatively expensive, which increases the production cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The semi-steel after vanadium extraction is used as raw material for primary smelting. The mass percentages of the semi-steel are: C: 3.65%, V: 0.036%, Mn: 0.05%, Cr: 0.042%, P: 0.060%, S: 0.003%, Fe: 96.15%, and the balance is impurities.

[0025]The semi-steel is blended into the compound blowing steelmaking converter for blowing, and a 536 oxygen lance is used for oxygen supply, slagging, dephosphorization and decarburization. The first steelmaking slagging is carried out at the same time as the oxygen blowing is started, and all the first slagging materials are added within 6 minutes after the oxygen blowing is started. In this first slagging material, the additions of active lime, composite slagging agent, high magnesium lime and steelmaking sludge balls are 30kg / t semi-steel, 19kg / t semi-steel, 19kg / t semi-steel and 2.8 kg / t semi-steel; when the oxygen supply time is 450 seconds, stop the oxygen supply and raise the oxygen lance, and turn down the furnace to remo...

Embodiment 2

[0030] Smelting is carried out using the method of Example 1, wherein the mass percentages of the semi-steel used for primary smelting are: C: 3.8%, V: 0.025%, Mn: 0.07%, Cr: 0.04%, P: 0.04%, S: 0.002%, Fe: 96.02%, and the balance is impurities.

[0031] The semi-steel is blended into the compound blowing steelmaking converter for blowing, and a 536 oxygen lance is used for oxygen supply, slagging, dephosphorization and decarburization. In the first slagging material, the addition amount of active lime, composite slagging agent, high magnesium lime and steelmaking sludge ball is 33kg / t semi-steel, 18kg / t semi-steel, 17kg / t semi-steel and 2.7kg / t semi-steel; in the second slagging material, the addition amount of active lime, composite slagging agent, and high-magnesium lime is 17.5kg / t semi-steel, 5.7kg / t semi-steel, and 5.7kg / t semi-steel steel; finally obtain molten steel with a temperature of 1693°C. Wherein, the mass percentages of the main components of the molten stee...

Embodiment 3

[0036] Smelting is carried out using the method of Example 1, wherein the mass percentages of the semi-steel used for primary smelting are: C: 3.50%, V: 0.031%, Mn: 0.03%, Cr: 0.06%, P: 0.07%, S: 0.005%, Fe: 96.3%, and the balance is impurities.

[0037] The semi-steel is blended into the compound blowing steelmaking converter for blowing, and a 536 oxygen lance is used for oxygen supply, slagging, dephosphorization and decarburization. In the first slagging material, the addition amount of active lime, composite slagging agent, high magnesium lime and steelmaking sludge ball is 32kg / t semi-steel, 17kg / t semi-steel, 18kg / t semi-steel and 3.1kg / t semi-steel; in the second slagging material, the addition of active lime, composite slagging agent, and high-magnesium lime is 20kg / t semi-steel, 7kg / t semi-steel, and 7kg / t semi-steel; finally The molten steel with a temperature of 1697°C is obtained. Wherein, the mass percentages of the main components of the molten steel are: C: ...

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Abstract

The invention provides a method for smelting high-chromium steel, which comprises the steps of: primarily smelting molten iron in a rotating furnace; tapping molten steel after the primary smelting into a steel ladle, adding high carbon ferrochrome in the tapping progress, thus enabling Cr content in the molten steel to reach 1.8-2.4 wt%; refining the steel ladle by an LF furnace, adding low carbon ferrochrome in the steel ladle refining progress by the LF furnace, wherein, on the basis of addition amount of chromium, a weight ratio of the low carbon ferrochrome to the high carbon ferrochromeis (1: 2) to (1: 3.5); and carrying out RH vacuum refining upon molten steel after steel ladle refining by the LF furnace. The invention further provides high-chromium steel smelted by the method forsmelting the high-chromium steel disclosed by the invention. Through the technical proposal, the method disclosed by the invention fully considers the influence to temperature and carbon composition of the molten steel due to addition of chromium alloy, and is good for matching of production rhythm among working procedures, so that production can be carried out smoothly. In addition, through the method disclosed by the invention, yield of the chromium is high, and high-chromium steel with a higher Cr content is obtained in an economical manner.

Description

technical field [0001] The invention relates to a method for smelting high-chromium steel and high-chromium steel. Background technique [0002] High chromium steel is used to make abrasive tools with load bearing, complex shape, small deformation, high wear resistance and good red hardness. High chromium steel is usually achieved by adding ferrochrome during the smelting process. [0003] However, due to the extremely low Cr content of ordinary molten iron itself, for example, semi-steel after vanadium extraction, the Cr content can only be increased through deoxidation alloying after converter tapping, that is, adding ferrochromium during tapping. However, the sharp increase of Cr content in the molten steel during this process will lead to a sharp drop in the temperature of the molten steel, which will affect the subsequent treatment, such as prolonging the heating time during ladle refining in the LF furnace. In addition, for steel types with low carbon content in the ...

Claims

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Application Information

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IPC IPC(8): C22C33/06C22C38/22C21C7/00
Inventor 陈天明陈永陈亮曾建华杨素波李桂军杨森祥周伟李清春张彦恒
Owner PANGANG GROUP VANADIUM TITANIUM & RESOURCES
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