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High-strength and high-toughness heat treatment method of medium-carbon silicon-manganese-chromium-nickel series low alloy steel

A heat treatment method and high-strength technology, applied in the field of high-strength and toughening heat treatment of low-alloy steel, can solve the problem that medium-carbon, silicon-manganese-chromium-nickel-based low-alloy steel cannot have strength and plastic toughness at the same time, and improve yield strength and elongation. , the effect of improving plasticity and toughness

Active Publication Date: 2014-12-31
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 silicon-manganese-chromium-nickel low-alloy steel obtained after the traditional heat treatment process cannot have good strength and ductility at the same time, and provides a medium-carbon silicon-manganese-chromium-nickel low-alloy steel High strength and toughness heat treatment method

Method used

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  • High-strength and high-toughness heat treatment method of medium-carbon silicon-manganese-chromium-nickel series low alloy steel
  • High-strength and high-toughness heat treatment method of medium-carbon silicon-manganese-chromium-nickel series low alloy steel

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specific Embodiment approach 1

[0010] Specific embodiment one: In this embodiment, a method for high-strength and toughening heat treatment of medium-carbon silicon-manganese-chromium-nickel low-alloy steel is carried out according to the following steps:

[0011] 1. The first heat treatment: Austenitize the medium-carbon silicon-manganese-chromium-nickel low-alloy steel, and then lower the martensitic transformation starting point Ms of the medium-carbon silicon-manganese-chromium-nickel low-alloy steel at 90°C to 10°C. ℃ for isothermal quenching, holding time is 120s, complete the first heat treatment; wherein said isothermal quenching is isothermal oil quenching or isothermal gas quenching;

[0012] 2. The second heat treatment: put the medium-carbon silicon-manganese-chromium-nickel low-alloy steel after the first heat treatment in step 1 above the martensitic transformation starting point Ms of the medium-carbon silicon-manganese-chromium-nickel low-alloy steel at 80°C to 200°C ℃ for isothermal quenchi...

specific Embodiment approach 2

[0015] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the specific operation process of the austenitization treatment described in step 1 is as follows: the medium-carbon silicon-manganese-chromium-nickel low-alloy steel is placed at a temperature of medium carbon silicon Manganese-chromium-nickel low-alloy steel A c3 Insulation under the above conditions of 30°C to 50°C, the holding time is 600s to 1800s, 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] Embodiment 3: This embodiment is different from Embodiment 1 or 2 in that the medium-carbon silicon-manganese-chromium-nickel low-alloy steel described in step 1 is 40SiMnCrNiMoV steel, 37SiMnCrNiMoV steel, 30Si2MnCrMoVE steel or 35SiMnCrMoVA steel. Others are the same as in the first or second embodiment.

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Abstract

The invention discloses a high-strength and high-toughness heat treatment method of medium-carbon silicon-manganese-chromium-nickel series low alloy steel, relating to a high-strength and high-strength heat treatment method of low alloy steel and aiming at solving the problem that the medium-carbon silicon-manganese-chromium-nickel series low alloy steel treated by a traditional heat treatment process cannot simultaneously obtain excellent strength, ductility and toughness. The high-strength and high-toughness heat treatment method comprises the following steps of: 1, carrying out austenitizing treatment on the medium-carbon silicon-manganese-chromium-nickel series low alloy steel, and then carrying out isothermal quenching to finish primary heat treatment; and 2, carrying out isothermal quenching on the medium-carbon silicon-manganese-chromium-nickel series low alloy steel subjected to the primary heat treatment in the step 1, and finally quenching to room temperature. The medium-carbon silicon-manganese-chromium-nickel series low alloy steel treated by using the method disclosed by the invention has the tensile strength of 1580MPa-2000MPa, the yield strength of 1340MPa-1870MPa, the ductility of 9.0-22.9 percent and the percentage reduction of area of 16.0-43.2 percent. The high-strength and high-toughness heat treatment method can be used for heat treatment of the medium-carbon silicon-manganese-chromium-nickel series low alloy steel.

Description

technical field [0001] The invention relates to a heat treatment method for high strength and toughness of low alloy steel. Background technique [0002] Medium-carbon silicon-manganese-chromium-nickel low-alloy steel is a low-alloy high-strength steel. Based on its high strength, it is mainly used in aircraft landing gear, rocket shell materials and engine pump cross shafts. The carbon content of medium-carbon silicon-manganese-chromium-nickel low-alloy steel is generally between 0.25% and 0.5%, and the total content of alloy elements is not higher than 5%, among which Cr, Ni and Mn elements can improve the hardenability of steel The addition of Mo and V elements can refine grains, improve the microstructure of steel, and improve the tempering ability of steel. One of the traditional heat treatment processes for medium-carbon silicon-manganese-chromium-nickel low-alloy steel is low-temperature tempering heat treatment after quenching. Through this process, the tensile stre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/20C21D1/22
Inventor 朱景川崔玉玲来忠红刘勇王慧
Owner HARBIN INST OF TECH
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