Strengthening and toughening heat treatment method of medium carbon manganese-vanadium low alloy steel

A heat treatment method and technology for low-alloy steel, applied in the field of heat treatment for strengthening and toughening of low-alloy steel, can solve the problems of not being able to have strength and plastic toughness at the same time, low strength and poor toughness of medium carbon manganese vanadium low alloy steel, and achieving good plasticity. , The effect of improving toughness and good plasticity
CN103243204AInactive Publication Date: 2013-08-14HARBIN INST OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HARBIN INST OF TECH
Publication Date
2013-08-14
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a strengthening and toughening heat treatment method of medium carbon manganese-vanadium low alloy steel, relating to a strengthening and toughening heat treatment method of low alloy steel. The method is used for solving the problems of low strength, bad toughness and incapability of simultaneously having both good strength and ductility and toughness of the medium carbon manganese-vanadium low alloy steel obtained by the traditional heat treatment technique. The method comprises the following steps: performing an austenitizing treatment on the medium carbon manganese-vanadium low alloy steel, and then, isothermal quenching the low alloy steel within a temperature section of 100-10 DEG C below a martensite transformation starting point Ms, holding for 60 s / mm according to the thickness of the medium carbon manganese-vanadium low alloy steel, and quenching the low alloy steel to the room temperature to finish the heat treatment of the medium carbon manganese-vanadium low alloy steel. The tensile strength of the obtained medium carbon manganese-vanadium low alloy steel is as high as 2060MPa, the yield strength is as high as 1540MPa, the ductility is as high as 15%, the percentage reduction of area is as high as 45%, and the low alloy steel has both high strength and plasticity, thereby being applicable to a strengthening and toughening heat treatment technique of medium carbon manganese-vanadium low alloy steel.
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Description

technical field

[0001] The invention relates to a heat treatment method for strengthening and toughening low alloy steel. Background technique

[0002] Medium-carbon manganese-vanadium low-alloy steel is a series of non-quenched and tempered commercial steels developed on the basis of quenched and tempered steels. It is mainly used in the production of steel for oil and gas transmission pipelines, steel for shipbuilding, steel for automobiles, and steel for construction machinery. . The carbon content of medium-carbon manganese-vanadium low-alloy steel is generally between 0.25% and 0.5%, and the total content of alloy elements is not higher than 5%. Among them, the addition of a small amount of alloy elements such as V and Ti can refine the grain , Improve the microstructure of steel, and can improve the hardenability of steel and the tempering stability of martensite. The traditional heat treatment process of medium-carbon manganese-vanadium low-alloy steel is quenching ...

Claims

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