Forging and heat treatment method for 55Ni40Cr3Al bearing steel
A heat treatment method and pre-forging heat treatment technology, applied in heat treatment equipment, heat treatment process control, manufacturing tools, etc., can solve the problems of low forging yield, coarse grain, uneven structure, etc., and achieve toughness and low temperature impact performance. The effect of uniform and stable forging structure and grain refinement
Pending Publication Date: 2021-05-25
HEBEI IRON AND STEEL
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Problems solved by technology
However, when 55Ni40Cr3Al steel is forged by conventional forging methods, problems such as low ingot plasticity, easy fracture, uneven structure, coarse grains, and low forging yield often occur, resulting in high production costs and poor high-temperature service performance. Bad question
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Embodiment 1-6
[0015] Embodiment 1-6: The forging and heat treatment methods of the 55Ni40Cr3Al bearing steel are as follows.
[0016] (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.
[0017] Table 1: Main chemical elements (wt%) of 55Ni40Cr3Al in each example
[0018]
[0019] (2) The forging and heat treatment method of the 55Ni40Cr3Al bearing steel includes pre-forging heat treatment, forging, solution treatment and aging treatment; the processes of each process are as follows:
[0020] A. Heat treatment process before forging: heat the steel ingot to 600±20°C, keep it for 90-120 minutes; then raise the temperature to 950±20°C with the furnace, keep it for 90-120 minutes; finally air cool to ...
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The invention discloses a forging and heat treatment method for 55Ni40Cr3Al bearing steel. The forging and heat treatment method includes the steps of: heat treatment before forging, forging, solution treatment and aging treatment, wherein the step of heat treatment before forging includes: heating a steel ingot to 600+ / -20 DEG C, and maintaining the temperature; subsequently heating to 950+ / -20 DEG C along with the furnace, and maintaining the temperature; and finally, conducting air cooling; the step of forging includes: firstly making a blank by using the steel ingot at the temperature of 1050-1150 DEG C and then conducting finish forging forming at the temperature of 950-1050 DEG C to obtain a forge piece; the step of solution treatment includes: heating the forge piece to 1180-1200 DEG C, and maintaining the temperature, and finally conducting air cooling; and the step of aging treatment includes: maintaining the forge piece at the temperature of 550-570 DEG C, and finally conducting air cooling. The room temperature tensile property of the 55Ni40Cr3Al steel forge piece obtained by the method is detected, wherein the tensile strength of the 55Ni40Cr3Al steel forge piece is 1050-1150 MPa, the percentage elongation after fracture is 20% to 26%, the percentage reduction of area is 44% to 52%, and the hardness HRC is 58 to 61.
Description
technical field [0001] The invention relates to a forging and heat treatment method, in particular to a forging 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 to the 55Ni40Cr3Al bearing steel composition can reduce the grain size, increase the strength and yield strength of the steel, and enable it to have better wear resistance and dimensional stability at higher temperatures. However, when 55Ni40Cr3Al steel is forged by conventional forging methods, problems such as low ingot plasticity, easy fracture, uneven structure, coarse grains, and low forging yield often occur, resulting in high production costs and poor high-temperature service performance. Bad question. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a forging and heat treat...
Claims
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Login to View More IPC IPC(8): B21K29/00C21D1/78C21D11/00
CPCB21K29/00C21D1/78C21D11/00
Inventor 吕达韩彦光张雲飞赵英利崔毅任帅嵇爽
Owner HEBEI IRON AND STEEL