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Quenching-partitioning thermal treatment method for high strength and toughness of medium carbon silicon-manganese low alloy steel

A heat treatment method and low-alloy steel technology, applied in heat treatment equipment, heat treatment process control, manufacturing tools, etc., can solve the problems of poor stress corrosion resistance, poor plastic toughness, etc., to improve stress corrosion resistance, reduce hydrogen embrittlement susceptibility, Effect of improving hydrogen embrittlement and stress corrosion susceptibility

Inactive Publication Date: 2012-07-04
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 problems that the existing medium-carbon silicon-manganese low-alloy steel has high strength, but its ductility is poor and its stress corrosion resistance is poor. method

Method used

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  • Quenching-partitioning thermal treatment method for high strength and toughness of medium carbon silicon-manganese low alloy steel
  • Quenching-partitioning thermal treatment method for high strength and toughness of medium carbon silicon-manganese low alloy steel
  • Quenching-partitioning thermal treatment method for high strength and toughness of medium carbon silicon-manganese low alloy steel

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specific Embodiment approach 1

[0012] Specific embodiment one: the high-strength toughness quenching-partition heat treatment method of the carbon silicon manganese low alloy steel in the present embodiment is realized through the following steps: one, the medium carbon silicon manganese low alloy steel is austenitized, and then in the medium carbon Austempering is carried out in the martensitic transition temperature range of silicon-manganese low-alloy steel, and the holding time is 60-120s; 2. The medium-carbon silicon-manganese low-alloy steel treated in step one is placed at the upper martensitic point M s Isothermal partition heat treatment at a partition temperature of 500° C. for 30 to 1800 seconds, and then quenched to room temperature to complete the high-strength and toughness quenching-partition heat treatment method for medium-carbon silicon-manganese low-alloy steel.

[0013] The martensitic transformation temperature range (M s ~ M f ) for a specific medium-carbon silicon-manganese low-alloy...

specific Embodiment approach 2

[0015] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the austenitization temperature in the austenitizing treatment of the medium-carbon silico-manganese low-alloy steel in step 1 is A of the medium-carbon silico-manganese low-alloy steel C3 Above 30℃~50℃, the holding time is 600s~900s, of which A C3 The temperature at which all ferrite transforms into austenite when heated. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0016] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that: the carbon content in the medium-carbon silicomanganese low-alloy steel described in step 1 is in the range of 0.25% to 0.60%. Others are the same as in the first or second embodiment.

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Abstract

The invention relates to a quenching-partitioning thermal treatment method for the high strength and toughness of medium carbon silicon-manganese low alloy steel and aims at solving the problems that the traditional medium carbon silicon-manganese low alloy steel has poor plasticity, toughness, and stress and corrosiveness resistance although having high strength. The quenching-partitioning thermal treatment method comprises the following steps of: carrying out austenization treatment on the medium carbon silicon-manganese low alloy steel, and then carrying out isothermal quenching in the martensite transition temperature range of the medium carbon silicon-manganese low alloy steel; and two. carrying out isothermal partitioning thermal treatment on the medium carbon silicon-manganese low alloy steel treated in the step one in a partitioning temperature from amartensite start (Ms) to 500 DEG C, and then quenching the medium carbon silicon-manganese low alloy steel to reach the room temperature, i.e. finishing the quenching-partitioning thermal treatment on the medium carbon silicon-manganese low alloy steel. After the medium carbon silicon-manganese low alloy steel is treated by the method, for the medium carbon silicon-manganese low alloy steel, the tensile strength reaches 1650MPa-2115MPa, the yield strength reaches 1490MPa-1950MPa, the coefficient of elongation is 5%-10%, and the reduction of area is 20%-50%.

Description

technical field [0001] The invention relates to a high-strength and toughness quenching-partitioning heat treatment method for medium-carbon silicon-manganese low-alloy steel. Background technique [0002] Medium-carbon silicon-manganese low-alloy steel generally has high strength and good elastic limit, and is mainly used in leaf springs, coil springs, safety valve springs and main springs working under high stress. The carbon content of this type of alloy steel is generally 0.50-0.70%, and the traditional heat treatment system is quenching + tempering. The high-strength martensite structure is obtained by quenching, and the thermal stress and structural stress after quenching are eliminated by tempering. The conventional structure is tempered troostite. Although the traditional heat treatment system can ensure that this type of alloy has a high elastic limit and can meet the service conditions of ordinary service environments, it has disadvantages such as poor plasticity,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/18C21D1/20C21D11/00
Inventor 来忠红吴韡剑朱景川刘勇陈凤
Owner HARBIN INST OF TECH
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