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Method for smelting high-nitrogen steel at normal pressure by two steps

A high-nitrogen steel, normal pressure technology, applied in the field of smelting high-nitrogen steel, can solve problems such as the lack of commercialized market supply, achieve the effect of easy organization and OEM entrustment, reduced process condition requirements, and good mechanical properties

Active Publication Date: 2016-03-09
CHANGCHUN SHIYUE ENERGY SAVING MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For high-nitrogen stainless steel metallurgical products with more than 0.65% N, domestic metallurgical producers have not yet achieved commercial market supply

Method used

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  • Method for smelting high-nitrogen steel at normal pressure by two steps
  • Method for smelting high-nitrogen steel at normal pressure by two steps
  • Method for smelting high-nitrogen steel at normal pressure by two steps

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Take smelting 300kg0Cr21Mn17Mo2.5N0.8 high-nitrogen austenitic stainless steel as an example, the chemical composition of high-nitrogen steel is as follows (%, weight percentage):

[0024]

[0025] Step 1, iron nitride alloy:

[0026] A. Milling

[0027] According to the composition requirements of high-nitrogen steel (as shown in Table 1), after considering metallurgical consumption or burning loss, calculate and purchase ingredients: micro-carbon ferrochromium pellets containing 73% Cr-27% Fe (size about 40-50mm) 200kg, 100kg of 99.9% pure manganese pellets (about 40-50mm in size); 300kg of reduced iron lumps containing 99.9% Fe, 20kg of 99.9% ferromolybdenum.

[0028] Jaw crushers, roller machines, and powerful crushers are used to crush different materials separately. After coarse crushing, medium crushing, and fine crushing, the materials are crushed to a target degree of 20 mesh; various materials are screened to obtain 18-25 The purpose powder, according to ...

Embodiment 2

[0058] In order to obtain a steel ingot with a more uniform and dense structure, electroslag remelting can be carried out on the ingot poured by one-time normal pressure melting. Taking the smelting of 150kg0Cr21Mn21Mo2.5N0.9 high-nitrogen austenitic stainless steel as an example, the chemical composition of the high-nitrogen steel is as follows ( %, weight percent):

[0059]

[0060] Step 1, iron nitride alloy:

[0061] A. Milling

[0062] According to the composition requirements of high-nitrogen steel (as shown in Table 1), after considering metallurgical consumption or burning loss, calculate and purchase ingredients: micro-carbon ferrochromium pellets containing 73% Cr-27% Fe (size about 40-50mm) 100kg, 50kg of 99.9% pure manganese pellets (about 40-50mm in size); 150kg of reduced iron lumps containing 99.9% Fe, 10kg of 99.9% ferromolybdenum.

[0063] Jaw crushers, roller machines, and powerful crushers are used to crush different materials separately. After coarse c...

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Abstract

The invention belongs to the field of steel smelting and making and particularly relates to a method for smelting high-nitrogen steel at the normal pressure by two steps. The method comprises the first step of iron alloy nitrogenization and the second step of smelting at the normal pressure. The first step includes powder preparation and nitrogenization treatment. The second step includes heating for smelting at the normal pressure, deslagging, final deoxidization, final deslagging and pouring. In order to meet the requirement for further refining, secondary normal-pressure smelting is conducted on a steel ingot obtained after primary normal-pressure smelting is completed in the normal-pressure condition, and a refined steel ingot is obtained through an electroslag remelting technique. By the adoption of the method, the high-nitrogen steel can be smelted at the normal pressure, the nitrogen content high enough and sufficient alloy elements are guaranteed, and thus the nitrogen content of alloy can be controlled more easily; technological conditions and operation requirements are lowered, and the production cost is controlled.

Description

technical field [0001] The invention belongs to the field of iron and steel smelting and manufacturing, and in particular relates to a method for smelting high-nitrogen steel through a two-step process under normal pressure. Background technique [0002] Nitrogen-alloyed high-nitrogen alloy steel, which has been widely valued in the world since the end of the 1980s, includes materials such as high-nitrogen stainless steel and high-nitrogen tool steel, especially high-nitrogen stainless steel. Due to its nickel saving and excellent performance, it has attracted the attention of various countries. It is even used as a strategic structural material. [0003] High-nitrogen stainless steel generally adopts pressurized smelting technology, and high-nitrogen steel is smelted under high pressure. The casting of products is limited by differential pressure casting technology. Most of the existing technologies are casting products under relatively high pressure. There are only a few ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/04B22F9/04C23C8/26
Inventor 陈咨伟季长涛王柏树霍晶晶姚军崔晓鹏张晓宇黄岩
Owner CHANGCHUN SHIYUE ENERGY SAVING MATERIAL CO LTD
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