Method for smelting low-aluminum high-nitrogen martensitic stainless steel in pressurization and induction manner

A martensitic stainless steel, pressure induction technology, applied in the field of pressure induction smelting low aluminum high nitrogen martensitic stainless steel, can solve the problems of slag boiling, silicon increase, cost increase, etc.

Active Publication Date: 2016-04-06
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the production of high-nitrogen stainless steel mainly adopts the pressurized electroslag remelting process. The existing process has the following disadvantages: there is uneven distribution of nitrogen elements, and sometimes secondary remelting is required; Composite electrodes, but the cost is significantly increased; in addition, adding nitrides to the slag will cause the slag to boil, interfere with the melting process, and may cause the metal film at the electrode tip to be exposed to high-pressure nitrogen, which cannot control the absorption of nitrogen by liquid metal, etc.
However, due to the low solubility of nitrogen in martensi...

Method used

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  • Method for smelting low-aluminum high-nitrogen martensitic stainless steel in pressurization and induction manner
  • Method for smelting low-aluminum high-nitrogen martensitic stainless steel in pressurization and induction manner
  • Method for smelting low-aluminum high-nitrogen martensitic stainless steel in pressurization and induction manner

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 21.0kg target steel grade 30Cr15MoN0.4 was smelted by pressure induction, and its composition range is shown in Table 2.

[0034] Table 2 Steel Type 30Cr15MoN0.4 Composition Range and Target Composition / wt.%

[0035]

[0036] (1) Determining the smelting and casting pressure and batching: According to the target composition of the steel grade in Table 2 and the smelting temperature of about 1550°C, it is calculated according to formula ① and formula ②: the smelting pressure p is 0.37MPa, and the casting pressure p' is 1.0MPa. The smelting raw materials and their quality are as follows: industrial pure iron 17250g, metal chromium 3240g, metal molybdenum 210g, metal manganese 90g, industrial silicon 101g, graphite 67g. Among them, graphite and industrial silicon are added 6.8% and 3.1% respectively on the basis of the target components for deoxidation. In addition, 21.0g of nickel-magnesium alloy containing 20% ​​magnesium was added for deep deoxidation, and 10.5g of ...

Embodiment 2

[0046] 20.0kg target steel grade 50Cr18MoVN0.36 was smelted by pressure induction, and its composition range is shown in Table 4.

[0047] Table 4 Steel Type 50Cr18MoVN0.36 Composition Range and Target Composition / wt.%

[0048]

[0049] (1) Determining the smelting and casting pressure and batching: According to the target composition of the steel grade in Table 4 and the smelting temperature of about 1550°C, it is calculated according to formula ① and formula ②: the smelting pressure p is 0.22MPa, and the casting pressure p' is 1.0MPa. The smelting raw materials and their quality are as follows: industrial pure iron 15950g, metal chromium 3529g, metal molybdenum 220g, metal manganese 64g, industrial silicon 97g, metal vanadium 40g, graphite 110g. Among them, graphite and industrial silicon are added 5.7% and 4.8% respectively on the basis of the target components for deoxidation. In addition, 25.0g of nickel-magnesium alloy containing 20% ​​magnesium was added for deep de...

Embodiment 3

[0059] 20.5kg of target steel grade 12Cr16MoNiVN0.5 was melted by pressure induction, and its composition range is shown in Table 6.

[0060] Table 6 Steel Type 12Cr16MoNiVN0.5 Composition Range and Target Composition / wt.%

[0061]

[0062] (1) Determining the smelting and casting pressure and batching: According to the target composition of the steel grade in Table 6 and the smelting temperature of about 1550°C, it is calculated according to formula ① and formula ②: the smelting pressure p is 0.46MPa, and the casting pressure p' is 1.2MPa. The smelting raw materials and their quality are as follows: industrial pure iron 16470g, metal chromium 3349g, metal molybdenum 205g, metal nickel 205g, metal manganese 110g, industrial silicon 77g, metal vanadium 61.5g, graphite 26g. Among them, graphite and industrial silicon are added 7.0% and 3.0% respectively on the basis of the target components for deoxidation. In addition, 20.5g of nickel-magnesium alloy containing 20% ​​magnes...

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Abstract

The invention discloses a method for smelting low-aluminum high-nitrogen martensitic stainless steel in a pressurization and induction manner and belongs to the field of metallurgy, wherein the method is suitable for smelting. The low-aluminum high-nitrogen martensitic stainless steel comprises, 0.1%-0.6% of carbon, 0%-0.5% of manganese, 12%-24% of chromium, not larger than 1% of silicon, 0%-3% of molybdenum, 0.1%-0.6% of nitrogen, 0%-2% of nickel, 0%-1% of vanadium, not larger than 0.02% of aluminum, not large than 0.002% of sulfur and the balance iron and inevitable impurities. The method includes the specific steps of blending, material distribution, temperature increase after vacuumizing, high-pure argon filling after raw material melting-down, graphite adding for deoxygenation, industrial silicon adding for deoxygenation when the environment is vacuumized to 10 Pa, nitrogen filling and alloying, nickel magnesium alloy and rare earth adding for heat preservation for 5 min to 10 min, nitrogen charging and casting and the like.

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 low-aluminum high-nitrogen martensitic stainless steel. Background technique [0002] High-nitrogen martensitic stainless steel refers to martensitic stainless steel with a nitrogen content greater than 0.08% in steel. The addition of nitrogen in martensitic stainless steel expands the temperature range of the austenite phase region, effectively inhibiting the formation of δ-ferrite; while ensuring interstitial solid solution strengthening, the carbides can be refined, accompanied by nitrogen The dispersed precipitation of compounds, etc. not only significantly improves the strength and hardness of martensitic stainless steel, but also can still guarantee the original toughness of martensitic stainless steel. In addition, the addition of nitrogen is beneficial to improve the corrosion resistan...

Claims

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Application Information

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IPC IPC(8): C22C33/06C22C38/46C22C38/44C22C38/40C22C38/24C22C38/22C21C7/06C21C7/064C21C7/10
CPCC21C7/0006C21C7/06C21C7/064C21C7/10C21D2211/008C22C33/06C22C38/001C22C38/22C22C38/24C22C38/40C22C38/44C22C38/46
Inventor 李花兵姜周华冯浩张彬彬张树才李鑫旭韩宇任翠东朱红春祝君辉
Owner NORTHEASTERN UNIV
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