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Rolling and heat treatment method of 55Ni40Cr3Al bearing steel

A heat treatment method and technology of bearing steel, applied in the direction of metal rolling, etc., can solve the problems of coarse grain, high production cost, uneven structure, etc., and achieve the effect of grain refinement, high hardness, and uniform and stable rolled rod structure

Pending Publication Date: 2022-02-18
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the 55Ni40Cr3Al steel is rolled by the conventional rolling method, problems such as low plasticity of the ingot, easy fracture, uneven structure, coarse grain, and low yield of the product often occur, resulting in high production cost and high temperature service. poor performance

Method used

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  • Rolling and heat treatment method of 55Ni40Cr3Al bearing steel
  • Rolling and heat treatment method of 55Ni40Cr3Al bearing steel

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Embodiment 1-8

[0014] Embodiment 1-8: The rolling and heat treatment methods of the 55Ni40Cr3Al bearing steel of the present invention are specifically described as follows.

[0015] (1) The main chemical elements and their weight percentages of the 55Ni40Cr3Al bearing steel are: C 0.01%~0.03%, Mn≤0.30%, Si≤0.30%, S≤0.030%, P≤0.030%, rare earth≤0.010 %, Cr 39.0% to 41.0%, Al 2.70% to 3.30%, and the balance is Ni. The main chemical elements of the 55Ni40Cr3Al bearing steel described in each embodiment are shown in Table 1.

Embodiment 55

[0016] Table 1. The main chemical elements (wt%) of each embodiment 55Ni40Cr3Al

[0017]

[0018] (2) The rolling and heat treatment method of the 55Ni40Cr3Al bearing steel includes pre-forging heat treatment, rolling and aging treatment processes, and the processes of each process are as follows:

[0019] A. Heat treatment process before rolling: keep the forged billet at 600±20°C for 40-60min, and then at 1160±20°C for 120-150min.

[0020] B. Rolling process: the forged billet is first rolled at 1140-1160°C, and then final rolled at 1160-1180°C to obtain a rolled bar;

[0021] C. Aging treatment process: the rolled bar is kept at 540-560° C. for 6-8 hours, and air-cooled to room temperature to obtain a finished 55Ni40Cr3Al bearing steel rolled bar.

[0022] D, the concrete technology of each embodiment is shown in Table 2.

[0023] Table 2. The concrete process of each embodiment

[0024]

[0025] (3) The tensile properties of the finished 55Ni40Cr3Al bearing steel ...

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Abstract

The invention discloses a rolling and heat treatment method of 55Ni40Cr3Al bearing steel, which comprises a heat treatment procedure before rolling: heating a forging stock to 600 + / -20 DEG C, preserving heat, heating to 1160 + / -20 DEG C along with a furnace, and preserving heat; a rolling procedure: the forging stock is subjected to primary rolling at the temperature of 1140-1160 DEG C and then subjected to finish rolling forming at the temperature of 1160-1180 DEG C, and a rolled bar is obtained; and an aging treatment procedure: specifically, the rolled rod is subjected to heat preservation at the temperature of 540-560 DEG C, and finally air cooling is conducted. The tensile strength of the obtained 55Ni40Cr3Al rolling rod ranges from 1350 MPa to 1500 MPa, the elongation after rolling ranges from 1000% to 3000%, the percentage reduction of area ranges from 90% to 97%, and the hardness HRC ranges from 59.5 to 61.5.

Description

technical field [0001] The invention relates to a rolling and heat treatment method, in particular to a rolling and heat treatment method of 55Ni40Cr3Al bearing steel. Background technique [0002] 55Ni40Cr3Al bearing steel is a high-temperature bearing steel with good high-temperature hardness. The rare earth elements La and Ce added in its composition can reduce the grain size, increase the strength and yield strength of the steel, and enable it to withstand high temperatures. It has good wear resistance and dimensional stability. However, when the 55Ni40Cr3Al steel is rolled by the conventional rolling method, problems such as low plasticity of the ingot, easy fracture, uneven structure, coarse grain, and low yield of the product often occur, resulting in high production cost and high temperature service. poor performance etc. Contents of the invention [0003] In order to solve the above technical problems, the present invention provides a rolling and heat treatment ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/06B21B1/16C21D6/00C22C38/04C22C38/02C22C38/06C22C38/40
CPCC21D8/065B21B1/16C21D6/004C21D6/005C21D6/008C22C38/04C22C38/02C22C38/005C22C38/06C22C38/40
Inventor 吕达张雲飞韩彦光赵英利崔毅嵇爽徐梓真
Owner HEBEI IRON AND STEEL
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