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A kind of production method of high-toughness nickel-containing gear steel for heavy-duty transmission

A production method and high-toughness technology, applied in the field of metallurgy, can solve the problems of high oxygen content, high-grade banded structure, and difficult-to-control inclusions in gear steel, so as to reduce segregation of alloy elements, improve surface quality, and reduce the burden of heating Effect

Active Publication Date: 2022-05-20
HANDAN IRON & STEEL GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The invention greatly reduces the production cost by adjusting the converter loading system and primary refining process, and simplifies the refining method. At the same time, it effectively solves the problems of high oxygen content in gear steel, difficult control of inclusions, poor composition uniformity, high grade of banded structure, and impact toughness. Low-level technical problems, the hot-rolled bars produced can be directly used for heavy-duty transmission gearboxes and other components after being processed and assembled by downstream users

Method used

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  • A kind of production method of high-toughness nickel-containing gear steel for heavy-duty transmission

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Embodiment 1

[0020] In this embodiment, a production method of high-toughness nickel-containing gear steel for heavy-duty transmissions includes converter smelting, LF refining, continuous casting, blanking, heating, and rolling processes. The specific process steps are as follows:

[0021] (1) Converter smelting process, using double slag process for smelting, dephosphorization to P to 0.028% at the beginning, then pouring 70% of the slag in the middle, returning to the zero position of the converter to re-slag with oxygen, adding active lime 21kg / t steel, magnesium balls 5kg / t steel, composite slag material 6kg / t steel, low-nickel pig iron with a phosphorus content of 0.060% and a nickel content of 12% was added in the early stage of smelting to replace the nickel plate, and coke was added to make up for the heat loss caused by the addition of cold material. The blowing process controls the carbon and oxygen product at the end of the blowing to 0.0021%. After the slag is removed from the...

Embodiment 2

[0028] In this embodiment, a production method of high-toughness nickel-containing gear steel for heavy-duty transmissions includes converter smelting, LF refining, continuous casting, blanking, heating, and rolling processes. The specific process steps are as follows:

[0029] (1) The converter smelting process adopts the double slag process, dephosphorizes to P to 0.025% at the beginning, then dumps 75% of the slag in the middle, returns to the zero position of the converter to re-slag with oxygen, and adds 23kg / t of active lime to steel and 4.5 magnesium balls kg / t steel, composite slag 7kg / t steel, low-nickel pig iron with a phosphorus content of 0.055% and a nickel content of 13% is added in the early stage of smelting to replace the nickel plate, coke is added to compensate for the heat loss caused by the addition of cold material, and the top and bottom of the double ring seam The double blowing process controls the carbon and oxygen product at the end of blowing to 0.00...

Embodiment 3

[0036] In this embodiment, a production method of high-toughness nickel-containing gear steel for heavy-duty transmissions includes converter smelting, LF refining, continuous casting, blanking, heating, and rolling processes. The specific process steps are as follows:

[0037] (1) Converter smelting process, using double slag process for smelting, initially dephosphorized to P to 0.026%, then dumped 69% of the slag in the middle, returned to the zero position of the converter to re-slag with oxygen, added active lime 22kg / t steel, magnesium balls 4.8 kg / t steel, composite slag material 6.5kg / t steel, low-nickel pig iron with a phosphorus content of 0.058% and a nickel content of 11% was added in the early stage of smelting to replace the nickel plate, coke was added to compensate for the heat loss caused by the addition of cold material, and the double-ring seam roof Bottom double blowing process controls the carbon and oxygen product at the end of blowing to 0.0018%. After th...

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Abstract

The invention discloses a production method of high-toughness nickel-containing gear steel for heavy-duty transmissions. The production method comprises the steps of converter smelting, LF refining, continuous casting, blanking, heating and rolling. The invention greatly reduces the production cost by adjusting the converter loading system and primary refining process, and simplifies the refining method. At the same time, it effectively solves the problems of high oxygen content in gear steel, difficult control of inclusions, poor composition uniformity, high band structure grade, and impact toughness. Low-level technical problems, central segregation of continuous casting slab ≤ 1.0 grade, finished band structure ≤ 1.0 grade, impact energy ≥ 85J, the production of high-toughness nickel-containing gear steel hot-rolled bars can be directly used for heavy-duty after processing and assembly by downstream users Components such as gear boxes for transmissions.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a production method of high-toughness nickel-containing gear steel for heavy-duty transmissions. Background technique [0002] Gears for heavy-duty transmissions are mainly used for important mechanical parts with high transmission power, high gear surface load, impact requirements and complex shapes, such as heavy-duty vehicles, tanks, railway locomotives, etc., due to their large force and very harsh service environment , has become a key component of complete sets of equipment for high-end machinery and equipment industries such as automobiles and locomotives. High-end heavy-duty gears are developing in the direction of high-speed, precision and low-noise technology, among which high surface wear resistance, high root bending strength and high center impact resistance will become typical technical features in the development trend of gear steel in the future. A...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/072C21C7/076B21B37/76B21B45/08B22D11/12C21C5/35
CPCC21C7/072C21C7/076C21C5/35B22D11/1206B21B37/76B21B45/08Y02P10/20
Inventor 雷明钢王利伟李金波李玉谦徐斌韩鹏龙陈晓辉师军谦
Owner HANDAN IRON & STEEL GROUP
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