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Control method for titanium nitride inclusion of gear steel bar material

A control method, titanium nitride technology, applied in the manufacture of converters, etc., can solve problems such as excessive nitride inclusions, achieve the effects of reducing the precipitation concentration product, preventing nitrogen increase, and inhibiting precipitation

Inactive Publication Date: 2014-12-17
SGIS SONGSHAN CO LTD
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Problems solved by technology

[0005] The invention provides a method for controlling titanium nitride inclusions in gear steel rods, which solves the problem of excessive nitride inclusions in steel, improves the pourability of molten steel, and improves the internal quality of billets

Method used

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  • Control method for titanium nitride inclusion of gear steel bar material

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Embodiment 120

[0018] Embodiment 1 is illustrated with the production process control of 20CrMnTiH gear round steel.

[0019] (1) Converter smelting, using a 130t converter for smelting, adding molten iron and scrap steel to the converter, the ratio of molten iron to scrap steel (weight ratio Wt%) is greater than 15:1, preferably, the ratio of molten iron to scrap steel (weight ratio Wt%) 15:1, use high-quality steel scrap, add low-nitrogen low-carbon ferrochromium, silicon-manganese, and ferromanganese alloys during the smelting process, and do not supplement blowing in the later stage of smelting; try to use bottom blowing argon during the smelting process, and add aluminum-ferroalloys from 1 / 3 of the tapping Perform pre-deoxidation to obtain a molten steel ladle. The said tapping 1 / 3 means that the molten steel in the converter furnace is poured into the ladle, and the molten steel in the furnace is poured into 1 / 3 of the total weight.

[0020] (2) Refining outside the furnace. After the...

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Abstract

The invention discloses a control method for a titanium nitride inclusion of a gear steel bar material. The control method adopts a production process of converter smelting-LF refining-RH refining-rectangular blank continuous casting, and comprises the following specific operation steps: (1) converter smelting: molten iron and waste steel are added in a converter; and the weight ratio of the molten iron to the waste steel is greater than 15: 1; (2) LF refining: the LF refining is performed for the molten steel to prevent the molten steel from being contacted with air; (3) RH vacuum refining: the vacuum degassing treatment is performed for the molten steel; the treatment time is kept not lower than 15 minutes under high vacuum degree not higher than 66.7 Pa; and an titanium-iron alloy is added in the period; and (4) continuous casting: after the RH refining is finished, the molten steel ladle is continuously cast; and in the continuous casting process, a crystallizer electromagnetic mixing technology with low superheat degree not higher than 35 DEG C, constant temperature and constant casting speed is adopted, and the argon sealing is performed. Thereby, the separated concentration product of titanium nitride is controlled.

Description

technical field [0001] The invention belongs to the technical field of alloy structural steel production, in particular to a method for controlling titanium nitride inclusions in gear steel rods. Background technique [0002] With the development of the automobile industry, higher requirements are placed on the service life of gear steel. A large number of studies have shown that micron-sized titanium nitride inclusions in gear steel steel bars have adverse effects on the processing properties of the steel and the toughness and fatigue properties of the final product, especially in high-end gear steels, which often require strict requirements. Therefore, the size of titanium nitride inclusions becomes one of the most important factors in controlling the fatigue life of gear steels. [0003] Studies have shown that fine titanium nitride can refine the grains of gear steel, but the micron-sized titanium nitride inclusions with large particles and corners precipitated in molt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/30C21C7/10C21C7/072B22D11/16
Inventor 刘年富岳峰李安军王银国刘锦标曾丽芳
Owner SGIS SONGSHAN CO LTD
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