Production process of continuous casting gear steel bar for rail transit
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A technology of rail transit and production technology, which is applied in the field of steel production, can solve the problems of high cost and low production efficiency, and achieve the effects of reducing hardness, ensuring uniform composition and good processing performance
Inactive Publication Date: 2021-12-21
NANJING IRON & STEEL CO LTD
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[0003] At present, steel for rail transit gearbox gears is produced by die casting + forging, which has low production efficiency and high cost
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[0029] The production process of a continuous casting gear steel bar for rail transit provided in this embodiment adopts the production mode of continuous casting + continuous rolling instead of the production mode of die casting + forging, including EAF smelting→LF refining→VD refining→wire feeding , composition fine-tuning, static stirring→continuous casting→slab slow cooling→heating→rolling→pit slow cooling→high temperature tempering→straightening→peeling→ultrasonic flaw detection→finished product inspection→packaging→labeling→weighing→storage,
[0030] EAF smelting: control electric furnace endpoint C: 0.06%, P: 0.010%, tapping temperature: 1645°C, 15 tons of steel left in the electric furnace after tapping, adding synthetic slag, silicon-manganese alloy, and aluminum block for pre-deoxidation during tapping and alloying;
[0031] LF refining: by adding aluminum blocks, the aluminum content in the molten steel is guaranteed to be Al: 0.030%, and the white slag is kept for ...
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Abstract
The invention discloses a production process of a continuous casting gear steel bar for rail transit, and relates to the technical field of steel production. The production process adopts a production mode of continuous casting and continuous rolling to replace a production mode of die casting and forging. The production process comprises the steps of EAF smelting, LF refining, VD refining, wire feeding, fine component adjustment, static stirring, continuous casting, casting blank slow cooling, heating, rolling, pit entering slow cooling, high-temperature tempering, straightening, peeling, ultrasonic flaw detection, finished product inspection, packaging, marking, weighing and warehousing. The production process aims at the purity control problem, the segregation control problem and the hardness control problem in the production process, the preparation method is provided, and the gear steel with the purity, the structure, the hardenability, the grain size and the surface quality meeting the rail transit requirements can be prepared.
Description
technical field [0001] The invention relates to the technical field of steel production, in particular to a production process for continuous casting gear steel bars for rail transit. Background technique [0002] The gearbox is the core component of the power transmission of the rail transit train, and it is the part that bears the strongest random dynamic load. Its working performance directly determines the reliability and safety of the rail transit train operation. Due to the vast territory of our country, rail transit equipment is faced with complex and variable working conditions such as large temperature difference between north and south, long operating span, high speed, and long-term operation, which puts forward more stringent requirements on the reliability and other performance of gearboxes and gears. On the one hand, steel mills are required to provide users with high-performance gear carburizing steel products that have stable hardenability and meet the user's ...
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