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Method for smelting high-nitrogen steel by vacuum induction positive-pressure furnace

A vacuum induction, high nitrogen steel technology, applied in the field of high nitrogen steel smelting, can solve problems such as low nitrogen solubility, and achieve the effect of precise composition and low cost

Inactive Publication Date: 2014-07-16
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] However, limited by factors such as smelting conditions, the solubility of nitrogen in stainless steel was still at a low level at that time

Method used

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  • Method for smelting high-nitrogen steel by vacuum induction positive-pressure furnace
  • Method for smelting high-nitrogen steel by vacuum induction positive-pressure furnace
  • Method for smelting high-nitrogen steel by vacuum induction positive-pressure furnace

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Experimental program
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Effect test

Embodiment 1

[0040] Embodiment 1: The equipment adopts a 50Kg pressurized induction melting furnace, and the ultimate vacuum degree is 6.67×10 -2 Pa, the power supply is 160KW, the frequency is 2500Hz, and the furnace load is 43Kg. The steel type is 13Cr21Mn16N (non-standard steel grade), and the composition control range and smelting control target are shown in Table 1.

[0041] Table 1: 13Cr21Mn16N composition control range and control objectives

[0042] by formula Through calculation, the nitrogen filling pressure value required to make the saturation solubility of nitrogen greater than 0.7% at a temperature of 1873K can be obtained, wherein the nitrogen content of manganese nitride is 5.95%.

[0043] Specific steps are as follows:

[0044] (1) Put pure iron, metal chromium, molybdenum, and crucible carbon into the furnace. Manganese nitride, manganese, and deoxidizer are loaded into the silo.

[0045] (2) Evacuate the smelting chamber of the pressurized induction furnace. Whe...

Embodiment 2

[0057] The equipment adopts a 50Kg pressurized induction melting furnace with a limit vacuum of 6.67×10 -2 Pa, the power supply is 160KW, the frequency is 2500Hz, and the furnace load is 43Kg. The steel type is 13Cr22Mn17N (non-standard steel grade), and the composition control range and smelting control target are shown in Table 3.

[0058] Table 3: 13Cr22Mn17N composition control range and control objectives

[0059] C MnS i Cr N S P Control range 0.15 14-17 <1

18-22 0.4-0.7<

0.03 <0.035

target ingredient - 16 - 21 0.45 - -

[0060] by formula By calculation, when the temperature is 1873K, the nitrogen filling pressure value required to make the saturation solubility of nitrogen greater than 0.45%, wherein the nitrogen content of manganese nitride is 5.95%, and the nitrogen content of ferrochromium nitride is 4.42%.

[0061] Specific steps are as follows:

[0062] (1) Put pure iron, metallic chromium, ferroniobium, f...

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Abstract

The invention provides a method for smelting high-nitrogen steel by a vacuum induction positive-pressure furnace, belonging to the technical field of smelting of high-nitrogen steel. The method comprises the steps: preparing a smelting material, clearing a crucible, loading a smelting raw material meeting the requirement of smelting a grade of steel; vacuumizing a smelting chamber of the vacuum induction furnace, and starting power transmission to heat a furnace material when the vacuum degree is less than 15Pa, wherein a power is 40 Kw; gradually increasing the power, and after a weld pool occurs, controlling the power to avoid splashing; completely smelting the furnace material, and reducing the power to perform refining to remove O, N, H and the like; starting a nitrogen making machine to introduce nitrogen, and adjusting a pressure in the furnace until reaching a required pressure value so that the saturation solubility of nitrogen is increased; adding the smelting raw material of increasing the partial pressure and a nitrogen-increasing alloy so as to increase the alloy yield; adding a final deoxidizing agent, controlling the temperature of molten steel, and pouring in an electrifying manner. The method is suitable for smelting the grade of steel requiring that the content of nitrogen is more than a defined numerical value or control range, and is capable of achieving the purposes of accuracy in component control, and high and stable nitrogen yield. The method has the advantages that the nitrogen yield reaches above 99 percent, particularly smelting high-nitrogen steel with nitrogen content up to 2 percent comes true, the components are accurate, and the cost is lower; the method is suitable for largely smelting special steel and steel for medical apparatuses and instruments with nitrogen content of 0.4-1.4 percent.

Description

technical field [0001] The invention belongs to the technical field of high-nitrogen steel smelting, and specifically relates to a method for smelting high-nitrogen steel in a vacuum induction positive pressure furnace, which is suitable for smelting steel types that require nitrogen content greater than a certain value or a control range, to achieve accurate composition control and nitrogen recovery. High yield and stable effect. Background technique [0002] 1. Significance of using high nitrogen steel [0003] Stainless steel is a steel that is not easy to rust. The stainless steel and corrosion resistance of stainless steel are due to the chromium-rich oxide film (passive film) on its surface. Because stainless steel has a series of characteristics such as excellent corrosion resistance, formability, compatibility, and strength and toughness in a wide temperature range, it has been widely used in heavy industry, light industry, daily necessities industry, and architectu...

Claims

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Application Information

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IPC IPC(8): C21C5/52C22C33/04
Inventor 邢长军姚春发宁小智曹呈祥吴林王雷李北鲍贤勇翁建寅
Owner CENT IRON & STEEL RES INST
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