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Steelmaking method and top-blowing powder spray gun for alloying by adding chromium ore in vacuum environment

A technology of vacuum environment and chromium ore powder, which is applied in the field of alloy steel refining, can solve the problems of poor stirring conditions, increased slag content and inclusions, and achieve the effects of reduced smelting cost, faster reduction rate and lower price

Active Publication Date: 2019-01-11
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Patent application CN201310459895.0 discloses the use of carbon powder, silicon powder or other active metal elemental powders to reduce (Cr 2 o 3 ), in order to prevent the exposure and secondary oxidation of molten steel, the stirring conditions of the LF furnace are poor, and the reduction of silicon powder or other metal elements (Cr 2 o 3 ) The non-metal oxides or metal oxides produced will increase the amount of slag and the number of inclusions in molten steel

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  • Steelmaking method and top-blowing powder spray gun for alloying by adding chromium ore in vacuum environment

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Embodiment 1

[0026] This embodiment is applied to a 120-ton vacuum alloying furnace, which is equipped with a vacuum hopper, which is in the form of a double bell valve, and the volume of the hopper is 2m 3 , the volume of the lower hopper is 2m 3 The chrome ore is made of broken Turkish lump ore, the chrome ore grade is 42%, the carbonaceous reducing agent is selected from coke grains, and the particle size range of the chromium ore and carbonaceous reducing agent is 5mm~10mm. GCr15 with a chromium content requirement of 1.3%~1.65% was used as the test steel.

[0027] The specific smelting operation process is as follows: heat the temperature of molten steel to 1650°C in the LF refining furnace, hoist the ladle to the vacuum alloying station, measure the temperature and take samples and place them in the vacuum device, connect the air blowing brick at the bottom of the ladle to the argon blowing pipe , the bottom blowing argon flow rate is set to 100L / min; start the vacuum pump system to...

Embodiment 2

[0030] This embodiment is applied to a 150-ton vacuum alloying furnace. The vacuum alloying furnace is equipped with a top-blowing powder spraying gun. A high-pressure wear-resistant rubber hose is used to connect the powder outlet of the powder spraying equipment with the top-blowing powder spraying gun. The central powder spraying pipe 1 of the gun is made of wear-resistant stainless steel, and the size is mm, the oxygen injection pipe 2 is a stainless steel pipe, the size is , the gas injection pipe 3 is a stainless steel pipe with a size of ; The chrome ore is selected from finely ground South African fine powder, the grade of chrome ore powder is 42%, the carbonaceous reducing agent is selected from anthracite coal powder, the particle size range of chromium ore powder and carbonaceous reducing agent is 0.5~1.0mm, and argon is used as Powder carrier gas. 20CrMnTi with a chromium content of 0.8% to 1.1% was used as the test steel.

[0031] The specific smelting opera...

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Abstract

The invention relates to the technical field of alloy steel refining and provides a steelmaking method for alloying by adding chrome ore to a vacuum environment. The steelmaking method comprises the following steps that in the process of vacuum treatment for molten steel, the chrome ore and a carbonaceous reducing agent are added into a steel ladle through a vacuum charging hopper, or the chrome ore and the carbonaceous reducing agent are sprayed into a metallic molten pool through high-temperature reducible flames generated by a top-blowing spraying gun, meanwhile, inert gases are bottom-blown for stirring, CO partial pressure is reduced through the vacuum environment, and the carbonaceous reducing agent is accelerated to reduce chrome ore powder, the molten steel is alloyed. The invention further provides a top-blowing powder spraying gun. The top-blowing powder spraying gun comprises a central powder spraying pipe, an oxygen blowing pipe, a gas blowing pipe, a water inlet pipe and a water outlet pipe. The steelmaking method for alloying by adding the chrome ore to the vacuum environment and the top-blowing powder spraying gun has the beneficial effects that the chrome ore in small granular or powdery shape and the carbonaceous reducing agent are alloyed directly in the vacuum environment, secondary oxidation does not occur on the molten steel, the yield of chrome is 93% or above, the reduction time is shortened by 2 min or above, slag quantity is reduced, the cleanliness of the molten steel is improved, and the melting cost of steel per ton is reduced by three yuan or above.

Description

technical field [0001] The invention relates to the technical field of alloy steel refining, in particular to a steelmaking method for alloying by adding chrome ore in a vacuum environment and a top blowing powder spray gun. Background technique [0002] Chromium is an important alloying element in a large number of alloy steels. Historically, chromium in chromium-containing alloy steels has been smelted by adding ferrochrome alloys in the refining process. At present, the methods for producing ferrochrome alloys mainly include electric furnace smelting and blast furnace smelting. According to alloy The difference in carbon content is divided into high-carbon ferrochrome, medium-carbon ferrochrome, low-carbon ferrochrome and micro-carbon ferrochrome. The price of ferrochrome alloy also increases with the decrease of carbon content. [0003] The output of chromium-containing alloy steel in my country is large, and the demand for chromium is huge, but my country is a chromium-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/04C21C7/10
CPCC21C7/0025C21C7/0037C21C7/10C22C33/04
Inventor 朱荣胡绍岩董凯刘润藻魏光升王云马国宏王雪亮李智峥武文合
Owner UNIV OF SCI & TECH BEIJING