18CrNiMo7-6 round billet continuous casting method for vertical type continuous casting production gear steel

A technology for continuous casting of round billets and gear steel, applied in the field of metallurgy, can solve the problems of unqualified band structure and high oxygen content of 18CrNiMo7-6 gear steel, and achieve low production cost, low oxygen content control, and high billet yield. Effect

Inactive Publication Date: 2017-01-11
HENAN ZHONGYUAN SPECIAL STEEL EQUIP MFG CO LTD
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  • Abstract
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Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a 18CrNiMo7 - 6 continuous casting round billet method

Method used

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  • 18CrNiMo7-6 round billet continuous casting method for vertical type continuous casting production gear steel
  • 18CrNiMo7-6 round billet continuous casting method for vertical type continuous casting production gear steel

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Embodiment Construction

[0016] The 18CrNiMo7-6 continuous casting round billet method for vertical continuous casting production of gear steel adopts the smelting method of electric arc furnace + ladle refining furnace + VD furnace vacuum degassing; the composition of the smelted gear steel is: C=0.15~0.21% by mass percentage , Si=0.10~0.40%, Mn=0.40~0.90%, P≤0.025%, S≤0.015%, Ni=1.40~1.70%, Cr=1.50%~1.80%, Mo=0.25~0.35%, V≤0.03 %, Cu≤0.20%, N=0.004~0.012%, Al=0.020~0.040%, and the balance is mainly Fe and unavoidable impurity elements.

[0017] Smelting primary molten steel with low carbon, low phosphorus, and low content of harmful elements in an electric arc furnace.

[0018] Deoxidation, desulfurization and complete alloying are carried out in the ladle refining furnace, and vacuum degassing is carried out in the VD furnace; after the VD vacuum degassing, it is poured into a continuous casting round billet on a vertical continuous casting machine.

[0019] The production process steps of the met...

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Abstract

The invention belongs to the technical field of metallurgy, and mainly relates to an 18CrNiMo7-6 round billet continuous casting method for vertical type continuous casting production gear steel. The method includes the steps that primary melting molten steel with low carbon, phosphorous and harmful element contents is obtained through smelting in an electric-arc furnace; deoxygenation, desulfuration and complete alloying are carried out in a steel ladle refining furnace, and vacuum degassing is carried out in a VD furnace; continuous casting round billets are obtained on a vertical type continuous casting machine in a pouring manner; in the continuous casting process, long nozzle argon blowing and stopper rod argon blowing are adopted for protecting pouring, and two-stage electromagnetic stirring is achieved through a crystallizer and casting strands; the round billets are cooled in a second cooling zone at three periods; and symmetrical solidification and flame cutting are carried out in the vertical direction. According to the continuous casting round billets produced according to the method, the problems that in the prior art, 18CrNiMo7-6 gear steel is high in production cost, the banded structure is disqualified, and the oxygen content is high are solved.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and mainly relates to a vertical continuous casting method for producing 18CrNiMo7-6 round blanks for gear steel. Background technique [0002] 18CrNiMo7-6 steel is widely used in large-modulus heavy-duty automotive gears and wind power gears with harsh application conditions due to its high hardenability, strength performance, and process performance. Due to its high requirements and special use conditions, 18CrNiMo7 -6 Materials are mostly produced by die casting or electroslag remelting, the yield of steel ingots or electroslag ingots is low, and the production cost is high, and the gear steel ingots produced by die casting methods have a long solidification time due to poor protection pouring effect , Uneven heat dissipation during solidification, resulting in unqualified banded structure and high oxygen content of the produced gear steel products. Contents of the invention [0003] The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/115B22D11/14B22D11/111C22C38/02C22C38/04C22C38/08C22C38/18C22C38/12C22C38/16C22C38/06C21C7/10C21C7/064C21C7/06
CPCB22D11/141B22D11/111B22D11/115C21C7/06C21C7/064C21C7/10C22C38/001C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/16C22C38/18
Inventor 雷冲王志林王怡群张宪成赵鹏宗健祁跃峰金会业
Owner HENAN ZHONGYUAN SPECIAL STEEL EQUIP MFG CO LTD
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