Low-alloy super-strength steel and heat treatment technique for the same

An ultra-high-strength, low-alloy technology, applied in heat treatment equipment, heat treatment process control, manufacturing tools, etc., can solve the problems that the tensile strength cannot reach 2000MPa and the performance cannot be satisfied.

Inactive Publication Date: 2009-06-10
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, after research by the inventor, it was found that the tensile strength of 40CrNiMo and 40CrNiMoA after heat treatment (quenching + low temperature tempering) could not reach 2000MPa without liquid nitrogen cryogenic treatment, so its performance could not meet the requirements of application

Method used

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  • Low-alloy super-strength steel and heat treatment technique for the same
  • Low-alloy super-strength steel and heat treatment technique for the same
  • Low-alloy super-strength steel and heat treatment technique for the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The material is purified and smelted in a vacuum induction furnace. The material composition is C 0.35, Mn 2.0, Si 0.4, Cr 2.0, Mo 0.4, Al 2.0, S 0.005, P 0.008, and Fe balance. After the ingot is forged, heat treatment is carried out, adopting the process of quenching + low temperature tempering, and then stabilizing aging treatment. The quenching temperature is 850°C, the quenching medium is water, the tempering temperature is 150°C, the tempering time is 1.5h, and the aging temperature is 100°C. , aging time 5h. Tensile properties after heat treatment σ b =2018MPa, σ s =1780MPa, δ(%)=10.2, φ(%)=48.3, impact energy α k = 30J. While having high strength, the material does not break until it is bent to an angle of nearly 120 degrees (such as figure 1 , 2 shown), indicating that the material also has good plasticity. The ingot is forged into bars of various specifications. The forging process shows that the material has good forgeability and high forging quality ca...

Embodiment 2

[0019] The material is purified and smelted in a vacuum induction furnace. The material composition is C 0.40, Mn 1.5, Si 0.27, Cr 1.5, Mo 0.33, Al 1.8, S 0.003, P 0.0021, and Fe balance. The heat treatment of the forged sample adopts the process of quenching + low temperature tempering, and then stabilizing aging treatment. The quenching temperature is 880°C, the quenching medium is water, the tempering temperature is 200°C, the tempering time is 2h, and the aging temperature is 120°C. The aging time is 5h. Tensile properties after heat treatment σ b =2120.3MPa, σ s =1856MPa, δ(%)=10.8, φ(%)=47.4, impact energy α k =22J. . The ingot is forged into bars of various specifications. The forging process shows that the material has good forgeability and high forging quality can be obtained, which guarantees the performance of the forged material. The forged material is annealed at 600°C, and the hardness after annealing is HRC36-37, which can ensure good machinability.

Embodiment 3

[0021] The material is purified and smelted in a vacuum induction furnace. The material composition is C 0.45, Mn 1.2, Si 0.3, Cr 0.79, Mo 0.25, Al 1.5, S 0.0031, P 0.0022, and Fe balance. Heat treatment of the forged sample, using quenching + low temperature tempering, and then stabilization aging treatment process, quenching temperature 900°C, quenching medium is oil, tempering temperature 250°C, tempering time 1.5h, aging temperature 150°C , aging time 5h. Tensile properties after heat treatment σ b =2017MPa, σ s =1774MPa, δ(%)=9.8, φ(%)=42.4, impact energy α k =24J. . The ingot is forged into bars of various specifications. The forging process shows that the material has good forgeability and high forging quality can be obtained, which guarantees the performance of the forged material. The forged material is annealed at 600°C, and the hardness after annealing is HRC36-37, which can ensure good machinability.

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Abstract

A kind of low alloy martensite steel with high strength, the character of it is the component range as following, quality percent: C0.3-0.6,Mn0.8-2.0,i0.1-0.4,r0.8-2.0,o0.1-0.4,l1.0-2.5,S<0.0l,P<0.01, the other is Fe. The steel will be stabilized after quenching and backfire at low temperature. The low alloy steel in this patent, can own very high strength and certain tenacity after a simple heat treatment, as a result the cost of it is lower.

Description

Technical field: [0001] The invention relates to metal materials, and in particular provides metal materials that can be used to make various precision bearing parts and structural parts with ultra-high strength requirements. technical background: [0002] In order to meet the needs of user applications, it is required to develop a new type of low-cost, high-strength low-alloy steel. Its index requires the tensile strength of the material to be above 2000MPa, and requires good machinability and certain toughness and plasticity. Some cemented carbide materials have relatively high hardness, but due to the inevitable appearance of a large number of pores during the preparation process, the toughness, plasticity and machinability of the material are extremely poor, which cannot meet the requirements. Typical ultra-high-strength structural steels include medium-carbon steels 40CrNiMo and 40CrNiMoA, and the chemical composition (mass percentage) of typical 40CrNiMo steels: [0...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/22C22C38/38C21D1/18C21D11/00F16C33/00
Inventor 严伟单以银杨柯
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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