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Method for preparing high-nitrogen steel through combination of pressurized induction and protective-atmosphere electro-slag remelting

A technology of pressure induction and protective atmosphere, applied in the field of high nitrogen steel smelting, can solve problems such as affecting the overall quality of steel, potential safety hazards, and complex pressurized slag furnace equipment.

Active Publication Date: 2017-05-31
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, induction melting is not easy to control the inclusions and sulfur content of the ingot, which affects the overall quality of the steel
[0004] Due to the complex equipment of the pressurized electroslag furnace, the production cost is high, and there are certain safety hazards
However, the protective atmosphere electroslag remelting furnaces equipped in many special steel factories are relatively simple. They are produced under the protection of atmospheric nitrogen, which is safe and reliable. It can effectively reduce the inclusions and sulfur content in steel and improve the solidification structure, but it cannot be obtained under atmospheric pressure Ingots with higher nitrogen content

Method used

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  • Method for preparing high-nitrogen steel through combination of pressurized induction and protective-atmosphere electro-slag remelting
  • Method for preparing high-nitrogen steel through combination of pressurized induction and protective-atmosphere electro-slag remelting
  • Method for preparing high-nitrogen steel through combination of pressurized induction and protective-atmosphere electro-slag remelting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] According to the nitrogen content in the target composition of high nitrogen steel, utilize formula ① to determine the nitrogen content of ingot; Described high nitrogen steel is high nitrogen martensitic steel, and its target composition is: C 0.3%, Mn 0.5 %, Cr 15%, Si 0.4%, Mo 1%, Ni 0.1%, N 0.25%, and the balance is Fe; the smelting pressure p of the pressure induction melting process is calculated by formula ② 1 ;Calculate casting pressure p by formula ③ 2 ;

[0070] Combining the composition of the target steel type, the composition of the smelting raw materials and the weight of the steel ingot to be smelted, calculate the weight of various raw materials required, and prepare the smelting raw materials;

[0071] Prepare raw materials for smelting; put industrial pure iron and chromium-containing components in the crucible of a pressurized induction furnace, and put molybdenum-containing components; put graphite and industrial silicon in the feeding bin, and put ...

Embodiment 2

[0086] Method is with embodiment 1, and difference is:

[0087] (1) The target composition of high nitrogen steel is: C 0.1%, Mn 5%, Cr 12%, Si 1%, Mo 3%, N 0.3%, Ni 1%, V 0.5%, and the balance is Fe;

[0088] Prepare raw materials for smelting; put industrial pure iron and chromium-containing components in the crucible of a pressurized induction furnace, put molybdenum-containing components and metallic nickel; put graphite and industrial silicon in the feeding bin, put vanadium-containing components, manganese-containing components composition and nickel-magnesium alloy; the chromium-containing composition is ferrochrome alloy, the molybdenum-containing composition is molybdenum-iron alloy, the manganese-containing composition is electrolytic manganese, and the vanadium-containing composition is vanadium-iron alloy;

[0089] (2) After all the smelting raw materials in the crucible of the pressurized induction furnace are melted, argon gas is introduced into the furnace to 30...

Embodiment 3

[0099] Method is with embodiment 1, and difference is:

[0100] (1) The target composition of high nitrogen steel is: C 0.6%, Cr 18%, Si 0.1%, N 0.35%, Ni2%, Mn 0.5%, V 1%, and the balance is Fe;

[0101] Prepare raw materials for smelting; put industrial pure iron and chromium-containing components in the crucible of the pressurized induction furnace, and put metal nickel; put graphite, industrial silicon and manganese-containing components in the feeding bin, and put vanadium-containing components and nickel-magnesium alloy; the chromium-containing component is metal chromium, the manganese-containing component is metal manganese, and the vanadium-containing component is metal vanadium;

[0102] (2) After all the smelting raw materials in the crucible of the pressurized induction furnace are melted, argon gas is introduced into the furnace to 50kPa, and 80% of the total mass of graphite is added from the feeding bin to the crucible; after adding the manganese-containing comp...

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Abstract

The invention provides a method for preparing high-nitrogen steel through a combination of pressurized induction and protective-atmosphere electro-slag remelting. High-nitrogen martensitic steel or high-nitrogen austenitic steel serves as the high-nitrogen steel. The method comprises the following steps such as raw material preparation, determination of the melting pressure and the pouring pressure, pressurized induction melting, deoxidization, pouring, and electro-slag remelting. The method provided by the invention has the advantages that the solidification velocity of the electro-slag remelting process is relatively high, so that the escape of nitrogen can be inhibited, a high-nitrogen steel remelting ingot of which the nitrogen content is slightly higher than the normal-pressure solubility is obtained, and the prepared high-nitrogen steel is excellent in corrosion-resistant property and mechanical property; and in order to reduce the production cost of the high-nitrogen steel, a new way for preparing the high-nitrogen steel of which the nitrogen content is slightly higher than the normal-pressure solubility by adopting the protective-atmosphere electro-slag remelting process is provided.

Description

technical field [0001] The invention belongs to the technical field of high-nitrogen steel smelting, and in particular relates to a method for double-linked smelting of high-nitrogen steel by pressure induction and protective atmosphere electroslag remelting. Background technique [0002] As a steel material with excellent performance, high-nitrogen steel is increasingly favored by people. Adding nitrogen to steel can play a role of solid solution strengthening and fine-grain strengthening, so that high-nitrogen steel has high strength, good toughness, and creep resistance. High nitrogen and strong corrosion resistance and other characteristics, while nitrogen can replace expensive nickel, thereby reducing production costs; However, due to the low solubility of nitrogen in steel under normal pressure, and the high-temperature ferrite phase with very low nitrogen solubility in the molten steel solidification process, it is easy to cause nitrogen segregation and nitrogen escap...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/44C22C38/46C22C38/58C22C33/06C21C7/10C21C7/06C22B9/18
CPCC21C7/06C21C7/10C22B9/18C22C33/06C22C38/001C22C38/02C22C38/04C22C38/44C22C38/46C22C38/58Y02P10/25
Inventor 李花兵姜周华冯浩韩宇焦卫超罗毅丁伟薛坤喜柴晓星王蓬勃祝君辉
Owner NORTHEASTERN UNIV
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