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

Inactive Publication Date: 2013-08-14
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention aims to solve the problem that the medium-carbon manganese-vanadium low-alloy steel obtained by the traditional heat treatment process has low strength and poor toughness, and cannot have good strength and plastic toughness at the same time, and provides a medium-carbon manganese-vanadium low-alloy steel with high strength. Toughening heat treatment method

Method used

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

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specific Embodiment approach 1

[0011] Specific implementation mode one: a kind of medium-carbon manganese vanadium low-alloy steel strengthening and toughening heat treatment method in this embodiment is carried out according to the following steps:

[0012] The medium-carbon manganese-vanadium low-alloy steel is austenitized, and then isothermally quenched in the temperature range of 100°C to 10°C below the martensitic transformation start point Ms of the medium-carbon manganese-vanadium low-alloy steel. The thickness of the carbon-manganese-vanadium low-alloy steel is calculated to be 60 s / mm, and then quenched to room temperature to complete the strengthening and toughening heat treatment of the medium-carbon manganese-vanadium low-alloy steel.

[0013] The martensitic transformation starting point Ms of the medium-carbon manganese-vanadium low-alloy steel of the present embodiment is a fixed value for the martensitic point Ms of a certain medium-carbon manganese-vanadium low-alloy steel, and those skille...

specific Embodiment approach 2

[0015] Specific embodiment two: the difference between this embodiment and specific embodiment one is that the specific operation process of the described austenitizing treatment is as follows: the medium carbon manganese vanadium low alloy steel is placed at the temperature of A of the medium carbon manganese vanadium low alloy steel c3 Insulation under the above conditions of 30°C to 50°C, the holding time is 60s to 3600s, that is, the austenitization treatment is completed; the A c3 It is the final temperature when ferrite is completely transformed into austenite when heated. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0016] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that: the composition of the described medium carbon manganese vanadium low alloy steel is as follows: C content is 0.25Wt.%~0.5Wt.%, Si content is 0.15 Wt.%~0.45Wt.%, Mn content 1.15Wt.%~1.8Wt.%, V content 0.08Wt.%~0.12Wt.%, Al content 0.02Wt.%~0.04Wt.%, Nb content ≤0.05Wt.%, P content ≤0.02Wt.% and S content ≤0.02Wt.%. Others are the same as in the first or second embodiment.

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/22C21D6/00C22C38/24C22C38/26
Inventor 朱景川邸可新来忠红刘勇王慧
Owner HARBIN INST OF TECH
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