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Method for pressurized induction smelting of high nitrogen stainless steel through pressure control in stages

A high-nitrogen stainless steel, pressure induction technology, applied in the direction of electric furnace, furnace, furnace type, etc., can solve the problems of accelerating the gas phase nitriding process, excessive nitrogen content of high-nitrogen stainless steel, increasing the difficulty of nitrogen content control, etc., to reduce Production cost, the effect of solving the problem of nitrogen pores

Active Publication Date: 2015-08-26
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of transition from smelting pressure to casting pressure (higher than smelting pressure), higher casting pressure not only solves the precipitation of nitrogen and the formation of pores, but also accelerates the gas-phase nitriding process, resulting in excessive nitrogen content in high-nitrogen stainless steel. Thus increasing the difficulty of nitrogen content control in the process of smelting high-nitrogen stainless steel in a pressurized induction furnace

Method used

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  • Method for pressurized induction smelting of high nitrogen stainless steel through pressure control in stages
  • Method for pressurized induction smelting of high nitrogen stainless steel through pressure control in stages
  • Method for pressurized induction smelting of high nitrogen stainless steel through pressure control in stages

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] The target steel grade is 18Cr18Mn2Mo0.9N, and its composition control range and smelting control target are shown in Table 2.

[0051] Table 2 18Cr18Mn2Mo0.9N composition control range and control target (wt%)

[0052]

[0053] Specific steps are as follows:

[0054] (1) Determination of batching and pressure parameters: According to the elemental composition of the target steel grade and formula ①, formula ②, and formula ③, the smelting pressure P 1 0.18MPa, casting pressure P 2 is 0.99MPa, the actual weight percentage (wt%) of the nitrogen content in the smelting raw materials 1 0.65%; based on this combination of raw material composition shown in Table 1 to prepare smelting raw materials, add 1.5kg / t electrolytic aluminum for deoxidation, wherein smelting raw materials include: 12044g industrial pure iron, 2683g metallic chromium, 400g metallic molybdenum, 3954g metallic Manganese, 92g industrial silicon, 1154g chromium nitride, 17.21g graphite.

[0055] (2) ...

Embodiment 2

[0063] The target steel grade is 18Cr14Mn3Mo0.9N, and its composition control range and smelting control target are shown in Table 4.

[0064] Table 4 18Cr14Mn3Mo0.9N composition control range and control target (wt%)

[0065]

[0066] Specific steps are as follows:

[0067] (1) Determination of batching and pressure parameters: According to the elemental composition of the target steel grade and formula ①, formula ②, and formula ③, the smelting pressure P 1 0.28MPa, casting pressure P 2 is 1.15MPa, the actual weight percentage (wt%) of the nitrogen content in the smelting raw material 1 It is 0.58%; based on this combination of the raw materials shown in Table 1, the smelting raw materials are prepared, and 1.5kg / t electrolytic aluminum is added for deoxidation. The smelting raw materials include: 13285g industrial pure iron, 2931g metal chromium, 630g metal molybdenum, 3230g metal Manganese, 97g industrial silicon, 1082g chromium nitride, 18.56g graphite.

[0068] (2)...

Embodiment 3

[0076] The target steel grade is 18Cr14Mn3Mo1Ni0.7N, and its chemical composition is shown in Table 6.

[0077] Table 6 18Cr14Mn3Mo1Ni0.7N composition control range and control target (wt%)

[0078]

[0079] Specific steps are as follows:

[0080] (1) Determination of batching and pressure parameters: According to the elemental composition of the target steel grade and formula ①, formula ②, and formula ③, the smelting pressure P 1 0.16MPa, casting pressure P 2 is 0.92MPa, the actual weight percentage (wt%) of the nitrogen content in the smelting raw materials 1 It is 0.48%; combined with the raw material composition shown in Table 1 to prepare smelting raw materials, adding 1.5kg / t electrolytic aluminum for deoxidation, wherein the smelting raw materials include: 13177g industrial pure iron, 3035g metal chromium, 2943g metal manganese, 210g metal Nickel, 631g metal molybdenum, 105g industrial silicon, 851g chromium nitride, 21.02g graphite.

[0081] (2) Charging: put in...

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Abstract

The present invention discloses a method for pressurized induction smelting of high nitrogen stainless steel through pressure control in stages, and belongs to the technical field of high nitrogen stainless steel smelting. The high nitrogen stainless steel smelted by the method comprises less than or equal to 0.2% of C, 12-23% of Mn, 15-24% of Cr, less than or equal to 1% of Si, 0-4.5% of Mo, 0.7-2% of N, 0-4.5% of Ni, and the balance of Fe. The method specifically comprises: preparing materials and determining pressurization parameters in stages; loading the materials; vacuumizing to achieve 10 Pa, and then carrying out electrifying heating; filling nitrogen gas with a purity of more than or equal to 99.99% to achieve smelting pressure after the raw material is subjected to steelmaking, alloying, and carrying out thermal insulation for 10-15 min; and filling high purity nitrogen gas until achieving a casting pressure, and then casting. According to the present invention, the nitridized alloy addition amount is optimized and the smelting pressure and the casting pressure are reasonably controlled, such that the problems of serious nitrogen segregation, nitrogen precipitation, nitrogen gas pore formation and the like during the high nitrogen stainless steel solidification process are effectively solved.

Description

technical field [0001] The invention belongs to the technical field of high-nitrogen stainless steel smelting, and in particular relates to a method for pressurized induction smelting high-nitrogen stainless steel with pressure controlled in stages. Background technique [0002] Nitrogen, as an important alloying element, has been widely used in austenitic stainless steel, duplex stainless steel and martensitic stainless steel. Through the interaction with other alloying elements such as Mn, Cr, Mo, V, Nb and Ti, it can not only Significantly improve the strength, toughness, creep resistance, wear resistance and corrosion resistance of steel and other properties, and nitrogen, as a strong austenite forming element, can also replace part of the expensive Ni element when added to austenitic stainless steel , so high-nitrogen stainless steel has increasingly become an important engineering material, and will be widely used in electric power, shipbuilding, railway, petrochemical...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C22C33/04C21C5/52
Inventor 姜周华朱红春李花兵冯浩张树才刘国海刘福斌李阳任翠东王琦
Owner NORTHEASTERN UNIV
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