A method for smelting molybdenum-containing stainless steel

The technology of stainless steel and molybdenum oxide powder is applied in the field of directly smelting molybdenum-containing stainless steel by using molybdenum oxide powder, and smelting molybdenum-containing stainless steel, which can solve the problem of high cost and achieve the effects of reducing raw materials, reducing production cost and simplifying production process.

Active Publication Date: 2014-10-22
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Molybdenum oxide powder is an intermediate product of ferromolybdenum alloy production. Molybdenum oxide powder is added with scrap steel scrap, aluminum powder, and magnesium powder in proportion to reduce it into ferromolybdenum in the reaction furnace. Because the aluminum reduction process is used, the cost is relatively high.

Method used

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  • A method for smelting molybdenum-containing stainless steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Example 1: Method for Smelting Molybdenum-Containing Stainless Steel by Blast Furnace Hot Metal Injection

[0063] (1) Molybdenum oxide powder is added to the feed tank, and the pressure of the feed tank is 0.2±0.02MPa; 95% of the molybdenum oxide powder in the raw material has a particle size of less than 1mm, and the molybdenum content in the molybdenum oxide powder is 60.8%;

[0064] (2) Use high-pressure nitrogen as the carrier gas, the carrier gas pressure is 0.6±0.02MPa, and the carrier gas flow rate is 60±3Nm 3 / h, the molybdenum oxide powder is transported to the fluidized bed to realize the fluidization of the molybdenum oxide powder;

[0065] (3) Molybdenum oxide powder enters the rotor feeder, and the injection speed is controlled by the rotor feeder;

[0066] (4) Add iron

[0067] Mix the blast furnace molten iron into the injection treatment tank, the mixing amount is 68±2 tons, remove the blast furnace slag, the slag thickness is required to be ≤30mm, a...

Embodiment 2

[0084] Embodiment 2: Method for smelting molybdenum-containing stainless steel by injection of stainless steel mother liquor

[0085] (1) Molybdenum oxide powder is added to the feeding tank, and the pressure of the feeding tank is 0.2±0.02MPa; the particle size of 95% of the molybdenum oxide powder in the raw material is less than 1mm, and the molybdenum content in the molybdenum oxide powder is 60.2%;

[0086] (2) Use high-pressure nitrogen as the carrier gas, the carrier gas pressure is 0.6±0.02MPa, and the carrier gas flow rate is 80Nm 3 / h, the molybdenum oxide powder is transported to the fluidized bed to realize the fluidization of the molybdenum oxide powder;

[0087] (3) Molybdenum oxide powder enters the rotor feeder, and the injection speed is controlled by the rotor feeder;

[0088] (4) Pre-melt mixed with steel: The stainless steel mother liquid is smelted in an electric furnace and tapped into the ladle. The distance from the upper edge of the mouth is 12...

Embodiment 3

[0107] Embodiment 3: Method for smelting molybdenum-containing stainless steel by spraying stainless steel mother liquor

[0108] (1) Molybdenum oxide powder is added to the feed tank, and the pressure of the feed tank is 0.2±0.02MPa; the particle size of 95% of the molybdenum oxide powder in the raw material is less than 1mm, and the molybdenum content in the molybdenum oxide powder is 60.3%;

[0109] (2) Use high-pressure nitrogen as the carrier gas, the carrier gas pressure is 0.6±0.02MPa, and the carrier gas flow rate is 80Nm 3 / h, the molybdenum oxide powder is transported to the fluidized bed to realize the fluidization of the molybdenum oxide powder;

[0110] (3) Molybdenum oxide powder enters the rotor feeder, and the injection speed is controlled by the rotor feeder;

[0111] (4) Pre-melt mixed with steel: The stainless steel mother liquor is smelted in an electric furnace and tapped into the ladle, with a steel output of 165±3 tons, and the electric furnace sl...

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Abstract

The invention relates to a method for smelting molybdenum-containing stainless steel. The method is characterized by comprising the following steps of: spraying molybdenum oxide powder into blast furnace molten iron or stainless steel mother liquor through a submerged lance in a carrier gas carrying and spraying manner; reducing MoO3 and MoO2 in the molybdenum oxide powder to metal molybdenum through carbon and silicon elements contained in the blast furnace molten iron or stainless steel mother liquor, and serving the molten iron and stainless steel mother liquor containing molybdenum as raw materials to smelt molybdenum-containing stainless steel. The invention belongs to the field of stainless steel smelting. The method is used for not only realizing direct application of molybdenum oxide in stainless steel smelting production to simplify the production process, but also greatly lowering the production cost of molybdenum-containing steel and reducing the consumption of raw materials and energy sources in the production of molybdenum-containing iron so as to save energy and reduce emission.

Description

technical field [0001] The invention relates to a method for smelting molybdenum-containing stainless steel, in particular to a method for directly smelting molybdenum-containing stainless steel by using molybdenum oxide powder, belonging to the field of stainless steel smelting. Background technique [0002] Molybdenum is an important alloying element, second only to chromium in stainless steel alloying elements. Adding molybdenum to stainless steel can promote the passivation of Fe-Cr alloy, thereby greatly improving the corrosion resistance of stainless steel in reducing media. Commonly used molybdenum-containing ferritic stainless steels include 00Cr17Mo, 00Cr18Mo2, and austenitic stainless steel 316L, typically All duplex stainless steels contain more than 2% molybdenum. Usually, molybdenum alloying in stainless steel production is done by ferromolybdenum alloy. [0003] The production process of ferromolybdenum alloy is shown as follows: [0004] [0005] Among t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/56
Inventor 刘卫东赵俊义王彦平
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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