Smelting method of high-aluminum nitriding steel

A high-aluminum nitriding steel and nitriding steel technology, which is applied in the field of high-aluminum nitrided steel manufacturing, can solve the problem of increased difficulty in controlling non-metallic inclusions, common and serious slag formation, and unstable aluminum yield To achieve the effect of optimizing the timing of adding, improving the effect of slag removal, and reducing the exposed area and probability

Active Publication Date: 2016-04-06
ZENITH STEEL GROUP CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, due to the extremely high aluminum content of this type of steel, oxidation, nitrogen fixation, and silicon return tend to occur during smelting, and secondary oxidation and mold slag failure are prone to occur in the continuous casting production process, resulting in unstable aluminum yields and non-metallic Increased difficulty in inclusion control, common and serious slag nodules, frequent spot segregation, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] High aluminum nitride steel is produced by the process route of EAF-CONVERTER electric converter smelting→LF furnace refining→VD vacuum treatment→CCM continuous casting:

[0019] The total charge of the electric converter is controlled at 101.46 tons, the molten iron ratio is 90%, the pig iron addition is 3.2 tons, and the rest is high-quality steel scrap. Tapping end point composition C: 0.12%, P: 0.008%, tapping temperature T: 1642°C, tapping amount 87.2 tons; adding 120kg of Al blocks and 110kg of calcium carbide for deoxidation, adding 455kg of silicon manganese, 2148kg of high carbon ferrochrome and 250kg of ferromolybdenum is alloyed after the furnace, and 800kg of lime and 300kg of low-silicon synthetic slag are added for slagging;

[0020] In the early stage of LF refining, 80kg of aluminum particles and 30kg of silicon carbide were used to strengthen deoxidation, the pressure of bottom blowing argon gas was adjusted to 0.45MPa, and the white slag was realized a...

Embodiment 2

[0026] High aluminum nitride steel is produced by the process route of EAF-CONVERTER electric converter smelting→LF furnace refining→VD vacuum treatment→CCM continuous casting:

[0027] The total charge of the electric converter is controlled at 100.62 tons, the molten iron ratio is 91%, the pig iron addition is 2.9 tons, and the rest is high-quality steel scrap. Tapping end point composition C: 0.15%, P: 0.009%, tapping temperature T: 1649°C, tapping volume 86.8 tons; adding 150kg of Al blocks and 100kg of calcium carbide for deoxidation during tapping, adding 450kg of silicon manganese, 2150kg of high carbon ferrochrome and 260kg of ferromolybdenum is alloyed after the furnace, and 750kg of lime and 200kg of low-silicon synthetic slag are added for slagging;

[0028] In the early stage of LF refining, 70kg of aluminum particles and 25kg of silicon carbide were used to strengthen deoxidation, the pressure of bottom blowing argon was adjusted to 0.55MPa, and the white slag was...

Embodiment 3

[0034] High aluminum nitride steel is produced by the process route of EAF-CONVERTER electric converter smelting→LF furnace refining→VD vacuum treatment→CCM continuous casting:

[0035] The total charge of the electric converter is controlled at 101.81 tons, the molten iron ratio is 95%, the pig iron addition is 2.6 tons, and the rest is high-quality steel scrap. Tapping end point composition C: 0.13%, P: 0.008%, tapping temperature T: 1646°C, tapping volume 85.7 tons; adding 150kg of Al blocks and 100kg of calcium carbide for deoxidation during tapping, adding 445kg of silicon manganese, 2140kg of high carbon ferrochrome and 250kg of ferromolybdenum is alloyed after the furnace, and 700kg of lime and 100kg of low-silicon synthetic slag are added for slagging;

[0036] In the early stage of LF refining, 85kg of aluminum particles and 35kg of silicon carbide were used to strengthen deoxidation, the pressure of bottom blowing argon gas was adjusted to 0.52MPa, and 100kg of lime ...

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Abstract

The invention belongs to the technical field of alloy structural steel, and particularly relates to a manufacturing method of high-aluminum nitriding steel. The process route of EAF-CONVERTER smelting and LF+VD+CCM are adopted to smelt the high-aluminum nitriding steel, and according to the component requirement range of the obtained high-aluminum nitriding steel, the high-aluminum nitriding steel comprises 0.35% to 0.40% of C, 0.20% to 0.30% of Si, 0.40% to 0.50% of Mn, 1.40% to 1.50% of Cr, 0.15% to 0.25% of Mo, 0.75% to 1.00% of Al, not larger than 0.020% of P, not larger than 0.015% of S, and the balance Fe. Round steel obtained through rolling is even in steel texture, high in cleanness and stable in performance quality.

Description

technical field [0001] The invention belongs to the technical field of alloy structural steel, and in particular relates to a method for manufacturing high-aluminum nitrided steel. Background technique [0002] High aluminum nitride steel is a quenched and tempered nitriding steel based on high aluminum steel. The surface is nitrided to form an aluminum nitride (AlN) layer. The dispersion strengthening of aluminum nitride is used to improve the hardness and strength of the surface. , and can maintain a certain hardness at a higher temperature (600-700°C). At the same time, this steel type also contains an appropriate amount of molybdenum, which can effectively inhibit high-temperature tempering brittleness. Therefore, this steel type has good hardenability and resilience. Less fire brittleness tendency, good high temperature processability, high wear resistance and fatigue resistance. This steel grade is widely used in the production of nitrided parts with high wear resista...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/06C21C5/54C21C7/06C21C7/10B22D11/00B22D11/111C22C38/18C22C38/06C22C38/12C22C38/04C22C38/02
CPCB22D11/001B22D11/111C21C5/54C21C7/0006C21C7/06C21C7/10C22C33/06C22C38/02C22C38/04C22C38/06C22C38/12C22C38/18Y02P10/20
Inventor 高宇波万文华
Owner ZENITH STEEL GROUP CORP
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