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Method for producing cogging by air-valve steel rolling

A production method and technology of gas valve steel, applied in the direction of metal rolling, metal rolling, rolling mill control device, etc., can solve the problems of long production cycle of gas valve steel and low metal billet rate, and achieve convenient and economical production organization Significant benefits and the effect of reducing production costs

Active Publication Date: 2007-11-14
JIANGSU SHENYUAN SPECIAL STEEL
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  • Summary
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AI Technical Summary

Problems solved by technology

[0005] The invention develops a production method for rolling and billeting of gas valve steel, which uses a rolling mill instead of a forging press to carry out thermal processing and billeting, and rolls qualified gas valve steel billets, which solves the problem of long production cycle of gas valve steel and metal billet rate Low problems, greatly reducing the production cost of metallurgical manufacturing, to meet user requirements and market needs

Method used

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Embodiment Construction

[0014] specific implementation plan

[0015] A special steel company implements the patent of the invention, and adopts continuous heating furnace to heat steel ingot (ingot weight 40Kg) + rolling mill (400 mill) for thermal processing to produce valve steel billet (55×55mm). When rolling in the first fire of the rolling mill, (A) the steel ingot enters the preheating zone, the furnace temperature is 300°C, and the temperature is kept for 120 minutes; (B) the steel ingot is pushed to the middle temperature zone by the jacking machine, and the temperature is 800°C, and the temperature is kept for 30 minutes; (C) ) The steel ingot enters the high temperature zone. At a temperature of 1180-1200°C, the steel ingot is kept warm for 60 minutes and then turned over to reduce the temperature difference between the positive and negative sides of the steel ingot, and the turned over steel ingot is kept warm for another 10 minutes; Only when the temperature is 20°C can the billet be hot-...

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Abstract

The present invention discloses a production method of valve steel billet. It is characterized by that said production method adopts a hot-working cogging process of 'using continuous heating furnace to heat steel ingot and utilizing rolling mill to roll in one heat'.

Description

technical field [0001] The invention relates to the field of preparation of austenitic or martensitic heat-resistant steel, and is especially suitable for the production method of heat-resistant steel used for intake and exhaust valves of internal combustion engines. Background technique [0002] Air valve steel profile refers to the rod with polished or tumbled surface, which is the key material mainly used to manufacture gasoline and diesel engine intake and exhaust valves. At present, the commonly used valve steels mainly include austenitic valve steels such as 5Cr21Mn9N14N (21-4N for short), 3Cr20Ni11Mo2PB (PB steel for short) and 4Cr14Ni14W2Mo (double 14 for short) and martensitic valve steels such as 4Cr9Si2 and 4Cr10Si2Mo. Because valve steel works under harsh conditions such as high temperature, high pressure, high erosion and high abrasion, it has high mechanical properties and corrosion resistance. It is precisely because of this that valve steel has a series of c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/02B21B37/00C21D11/00C21D9/70
Inventor 宫友军吴申庆叶刚练明生韩小军赵永宏
Owner JIANGSU SHENYUAN SPECIAL STEEL
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