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A spheroidizing annealing heat treatment method for ultra-high carbon bearing steel

A heat treatment method, spheroidizing annealing technology, applied in the field of spheroidizing annealing heat treatment of ultra-high carbon bearing steel, can solve the problems of short time consumption, and achieve the effects of short time consumption, increase of phase interface, and convenient temperature control

Active Publication Date: 2022-01-04
临清市同兴轴承锻造有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The present invention aims at the above-mentioned deficiencies in the prior art, and provides a spheroidizing annealing heat treatment method for ultra-high carbon bearing steel. Short time consumption, so as to achieve the purpose of saving energy, reducing decarbonization defects, and shortening the production cycle

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  • A spheroidizing annealing heat treatment method for ultra-high carbon bearing steel
  • A spheroidizing annealing heat treatment method for ultra-high carbon bearing steel
  • A spheroidizing annealing heat treatment method for ultra-high carbon bearing steel

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Embodiment 1

[0044] A spheroidizing annealing heat treatment method for ultra-high carbon bearing steel, comprising the following steps:

[0045] (1) Preparation of nanobainite + martensite multiphase structure: Austenitize the forged or rolled ultra-high carbon bearing steel at 850-1000 ºC, and the heating time for austenitization is super The effective thickness of high-carbon bearing steel is multiplied by the heating coefficient of 1-1.5 min / mm, and then immersed in a salt bath furnace at 200-300°C for 15-60 minutes of isothermal treatment. After isothermal treatment, water quenching or oil quenching or lower than Ms The salt bath at the point can get the multi-phase structure of nanobainite and martensite;

[0046] Wherein, by weight percentage, the chemical composition of the ultra-high carbon bearing steel is: C: 1.01-1.40%, Si: 0.5-2.0%, Mn: 0.5-2.0%, Cr: 0.5-2.0%, Al: 1.0 -2.0%, Mo: 0-0.5%, V: 0-2.0%, Re: 0-0.5%, and the balance is Fe.

[0047] Among them, the effective thicknes...

Embodiment 2

[0054] A spheroidizing annealing heat treatment method for ultra-high carbon bearing steel, comprising the steps of:

[0055] (1) Preparation of nanobainite + martensite multiphase structure: According to weight percentage, the chemical composition of ultra-high carbon bearing steel in this example is: C: 1.17%, Mn: 0.53%, Si: 0.50% , Cr: 1.53%, Al: 1.46%, and the balance is Fe.

[0056] The billet of ultra-high carbon bearing steel is fully austenitized at 1200°C and then forged into a rod shape, and cooled under control to obtain a structure of pearlite + a small amount of secondary carbide, such as figure 1 shown.

[0057] Then austenitize at 850ºC, the heating time is 1 min / mm (according to the effective thickness), then immerse in a salt bath furnace at 300°C for 45 min isothermal treatment, and finally perform oil quenching to obtain nanobainite + martensite Complex tissue, such as figure 2 shown.

[0058] (2) Spheroidizing annealing heat treatment: the nano-bainite...

Embodiment 3

[0062] A spheroidizing annealing heat treatment method for ultra-high carbon bearing steel, comprising the steps of:

[0063] (1) Preparation of nanobainite + martensite multiphase structure: According to weight percentage, the chemical composition of ultra-high carbon bearing steel in this example is: C: 1.32%, Mn: 0.52%, Si: 0.49% , Cr: 1.51%, Al: 1.52%, and the balance is Fe.

[0064] The billet of ultra-high carbon bearing steel is fully austenitized at 1200°C and then forged into a rod shape, and cooled under control to obtain a pearlite + a small amount of secondary carbide structure, as shown in Figure 4.

[0065] Then carry out austenitization at 880ºC, the heating time is 1 min / mm (according to the effective thickness), then immerse in a salt bath furnace at 270°C for 45 min isothermal treatment, and finally perform oil quenching to obtain nanobainite + martensite Complex tissue, such as Figure 5 shown.

[0066] (2) Spheroidizing annealing heat treatment: the nano...

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Abstract

The invention discloses a spheroidizing annealing heat treatment method of ultra-high carbon bearing steel, which relates to the technical field of heat treatment of ultra-high carbon bearing steel. A spheroidizing annealing heat treatment method for ultra-high carbon bearing steel, comprising the steps of: heating the ultra-high carbon bearing steel having a complex structure of nano-bainite and martensite at 700-750° C. for 4-8 hours After cooling out of the furnace, a spheroidized annealing structure in which fine granular carbides are evenly distributed on the equiaxed ferrite matrix can be obtained. The time consumption of the spheroidizing annealing heat treatment method provided by the present invention is shorter than that of the existing spheroidizing annealing heat treatment method, so that the purposes of energy saving, consumption reduction, decarburization defect reduction and production cycle can be achieved.

Description

technical field [0001] The invention relates to the technical field of heat treatment of ultra-high carbon bearing steel, in particular to a spheroidizing annealing heat treatment method of ultra-high carbon bearing steel. Background technique [0002] Ultra-high carbon bearing steel with a multiphase structure of nanobainite and martensite is a new type of bearing steel. The excellent strength and toughness of the multiphase structure of nanobainite and martensite endows this The super-long fatigue life of the new type of bearing steel makes it have broad application prospects in bearings and other fields. [0003] The Chinese patent application number CN201310442972.1 discloses "A Heat Treatment Method for Ultra-High Carbon Type Bearing Steel". After this heat treatment method, it can be prepared with martensite + super bainite + retained austenite + residual carbide Ultra-high carbon bearing steel with multi-phase structure, the multi-phase structure of martensite + supe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D6/00C21D1/32C21D1/20C22C38/02C22C38/04C22C38/06C22C38/22C22C38/24C22C38/34C22C38/38
CPCC21D6/002C21D6/005C21D6/008C21D1/32C21D1/20C22C38/02C22C38/04C22C38/06C22C38/22C22C38/24C22C38/34C22C38/38C22C38/002C21D2211/002C21D2211/008C21D2211/005C21D2211/004
Inventor 刘宏基汪庆刚姚鲁
Owner 临清市同兴轴承锻造有限公司
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