High toughness alloy steel and its heat treatment device

Abstract

The invention relates to a type of high-toughness alloy steel, and a heat treatment device thereof. The material is a 25CrMnSi material. The heat treatment device comprises orderly arranged components of: a normalizing furnace in which a temperature can be configured as 920 DEG C +-10 DEG C, and a residence time can be configured as 120 minutes; a quenching furnace in which a temperature can be configured as 880 DEG C +-10 DEG C, and a residence time can be configured as 180 minutes; a quenching tank in which a temperature of a cooled product is configured as 300 DEG C, wherein a cooling medium of a water-soluble quenching liquid is placed in the quenching tank; and a tempering furnace in which a temperature can be configured as 610 DEG C +-10 DEG C, and a residence time can be configuredas 180 minutes. The tensile strength of the material is 850Mpa, the yield strength of the material satisfies 700Mpa, and the hardness HB of the material is 240 to 280. With the material, mechanical requirements of ship-use container lockset material can be satisfied. Also, the material has advantages of low metal cost, good and appropriate strength, good and appropriate hardness, good and appropriate flexibility, and good and appropriate toughness. The heat treatment device has advantages of easy processing, simple equipment, convenient operation, and low environmental pollution.

Description

technical field [0001] The invention relates to a material and a heat treatment device thereof, especially a high-toughness alloy steel material. Background technique [0002] The strength, hardness, plasticity and toughness of materials, such as alloy steel, are usually a contradictory unity. Selecting a reasonable alloy composition and content to achieve the optimal alloy material has always been the direction of efforts in the industry. For the special work requirements of the marine container locks, choosing reasonable strength, hardness, plasticity and toughness materials is the technical problem to be solved in this field. [0003] In the prior art, 42CrMo material is used and a corresponding heat treatment process is added at the same time as the material of the lock. The heat treatment includes: [0004] 1. Normalizing: In the mesh belt furnace, the normalizing temperature is 900°C±10°C, and the holding time is 120 minutes, then air cooling; [0005] 2. Quenching...

AI Technical Summary

Problems solved by technology

For example, the existing material 42CrMo uses alloy steel with precious metals, and its material cost is relatively high; at the same time, during the heat treatment process, especially after quenching, the amount of bent-crystal martensite begins to increase, and its plasticity and toughness are poor; Furthermore, the process in heat treatment is relatively complicated, and the cost is high. At the same time, heat treatment is easy to produce more environmental pollution.

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