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A method for alloying vanadium in high manganese steel with controllable nitrogen

A technology of vanadium alloying and high manganese steel, which is applied in the field of metallurgy, can solve the problems of reducing yield, reducing steel toughness and plasticity, blue brittleness, etc., and achieves the effects of reducing the negative effect of aging, weakening continuous casting cracks, and weakening the tendency to occur

Active Publication Date: 2022-05-13
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Excessive nitrogen content in molten steel will also lead to defects such as subcutaneous bubbles, looseness, transverse cracks, increased inclusions, age hardening, and blue brittleness of the billet. In addition, nitrogen and titanium, aluminum and other elements in the steel form angular inclusions Group, will also seriously reduce the toughness and plasticity of steel, for high-strength high manganese steel, it is very easy to cause the casting slab to crack during the continuous casting process, reducing the yield

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] In this embodiment, a kind of high manganese steel is smelted. The chemical composition of high manganese steel is calculated by weight percentage: C: 0.05%, Mn: 10%, P: 0.008%, S: 0.001%, V: 0.0.05% , N: 0.006%; the smelting process is as follows:

[0028] (1) Put the pretreated molten iron into a 100t top-blown converter for decarburization and dephosphorization. When tapping, the carbon value is 0.045%, the oxygen value is 560ppm, and the tapping temperature is 1688°C;

[0029] (2) The molten steel enters the LF furnace for refining, adding manganese metal and ferro-vanadium alloy in 8 batches; adding 0.9t of manganese metal and 5.8kg of ferro-vanadium alloy in each batch, and stirring with bottom blowing argon after each batch is added;

[0030] (3) Molten steel enters the RH furnace for vacuum degassing operation. After the circulation is uniform, metal manganese and vanadium-ferroalloy are added in 5 batches. Each batch is added with 0.9t of metal manganese and 5....

Embodiment 2

[0033] In this embodiment, a kind of high manganese steel is smelted. The chemical composition of high manganese steel is calculated by weight percentage: C: 0.06%, Mn: 15%, P: 0.008%, S: 0.001%, V: 0.08%, N :0.007%), the smelting process is as follows:

[0034] (1) Mix the pretreated molten iron into a 100t top-blown converter for decarburization and dephosphorization. When tapping, the carbon value is 0.048%, the oxygen value is 575ppm, and the tapping temperature is 1682°C;

[0035] (2) The molten steel enters the LF furnace for refining, adding manganese metal and ferro-vanadium alloy in 8 batches, adding 1.25t of manganese metal and 9.3kg of ferro-vanadium alloy in each batch, and stirring with bottom blowing argon after each batch is added;

[0036] (3) Molten steel enters the RH furnace for vacuum degassing operation. After the circulation is uniform, metal manganese and vanadium-iron alloy are added in 5 batches. Each batch is added with 1.25t of metal manganese and 9....

Embodiment 3

[0039] In this embodiment, a high manganese steel is smelted. The chemical composition of the high manganese steel is calculated by weight percentage: C: 0.06%, Mn: 20%, P: 0.008%, S: 0.001%, V: 0.10%, N: 0.008%), the smelting process is as follows:

[0040] (1) Put the pretreated molten iron into a 100t top-blown converter for decarburization and dephosphorization. When tapping, the carbon value is 0.052%, the oxygen value is 580ppm, and the tapping temperature is 1680°C;

[0041] (2) The molten steel enters the LF furnace for refining, adding manganese metal and ferro-vanadium alloy in 8 batches, adding 1.8t of manganese metal and 11.5kg of ferro-vanadium alloy in each batch, and stirring with bottom blowing argon after each batch is added;

[0042] (3) Molten steel enters the RH furnace for vacuum degassing operation. After the circulation is uniform, metal manganese and vanadium-iron alloy are added in 5 batches. Each batch is added with 1.8t of metal manganese and 11.5kg ...

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PUM

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Abstract

The invention relates to a nitrogen-controllable high-manganese steel-vanadium alloying method, comprising: 1) molten iron is mixed into a converter for decarburization and dephosphorization operation; carbon value, oxygen value and temperature during tapping are controlled; 2) molten steel is fed into LF Refining in the furnace, adding metal manganese and vanadium-iron alloy in batches, and blowing argon at the bottom after each batch is added to stir; After one batch, circulate until the alloy is completely melted before adding the next batch; the tapping temperature is 1530-1540°C. The invention can effectively control the nitrogen content in the steel, exert the strengthening effect of vanadium nitrogen to a greater extent, avoid the cracking of the slab in the continuous casting process, and optimize the product performance.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a nitrogen-controllable vanadium alloying method for high-manganese steel. Background technique [0002] Because of its excellent wear resistance and toughness, high manganese steel is widely used in machinery, mining, metallurgy, coal, chemical industry and other fields that require a large amount of wear-resistant materials. Because the steel contains high Mn, it is necessary to add a large amount of manganese ore or manganese-containing alloys to the raw iron during smelting, and these manganese ores or manganese-containing alloys contain more impurities, so more stringent requirements are put forward to ensure the purity of steel requirements. [0003] As a harmful element in high manganese steel, nitrogen has obvious deterioration effects on the toughness, plasticity, weldability and electrical conductivity of steel. Excessive nitrogen content in molten steel will also ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/06C22C38/04C22C38/12
CPCC22C33/06C22C38/04C22C38/12
Inventor 范思鹏廖相巍贾吉祥曹东朱晓雷彭春霖魏崇一许孟春杨骥
Owner ANGANG STEEL CO LTD