A kind of production process of alloy tool steel wire rod with full bainite structure

An alloy tool steel, full bainite technology, applied in the field of rolling, can solve the problems of high wire rod hardness, non-uniform wire rod structure, non-uniform tool performance, etc. The effect of precipitation and shortening of phase transition incubation period
CN111690801BActive Publication Date: 2021-11-02ZENITH STEEL GROUP CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
ZENITH STEEL GROUP CORP
Publication Date
2021-11-02

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Abstract

The invention discloses a production process for alloy tool steel hot-rolled wire rods with a full bainite structure. Higher than 1100°C; in the rolling process, the finishing rolling + MINI unit is used for rolling to realize the non-recrystallization zone and α + γ large deformation rolling, the cumulative area reduction rate reaches 55-85%, and the austenite structure is in the During the deformation process, a large number of crystal defects such as dislocations and deformation bands are produced, and the resulting deformation stores energy, which shortens the incubation period of phase change and increases the driving force of phase change; the spinning temperature in the cooling process is 750-800 °C, and Stelmore controlled cooling . The invention effectively prevents the precipitation of martensite and the mixture of martensite, pearlite and ferrite in the rolling cooling process, obtains a full bainite structure, avoids brittle fracture of the martensite structure, and is beneficial to the processing and use of wire rods and improve fatigue performance.
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Description

technical field

[0001] The invention belongs to the technical field of rolling, and relates to a production method of an alloy tool steel wire rod, in particular to a blanking, heating, rolling and cooling process of an alloy tool steel wire rod with a full bainite structure. Background technique

[0002] Alloy tool steel is a type of steel that adds chromium, molybdenum, vanadium and other alloying elements on the basis of carbon tool steel to improve hardenability, toughness, wear resistance and heat resistance. It is mainly used to manufacture measuring tools and cutting tools , impact-resistant tools, cold and hot molds and some special-purpose tools.

[0003] The steel used for electric hand tools is a steel type with higher requirements among alloy tool steels. It is required to have high torque, hardness, wear resistance, impact toughness and service fatigue performance, so carbon, silicon, vanadium, molybdenum and nickel are added to the composition design. , niobiu...

Claims

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