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en-31 alloy
en-31 steel plate
en-31 Round steel
Alloy E52100
1.3505 Round steel
100cr6 rolling bearing steel
en-31 alloy is the most widely used high-carbon chromium bearing steel with low alloy content and good properties. After quenching and low temperature tempering, it has high hardness, uniform structure, good wear resistance and high contact fatigue performance. The cold working plasticity of the steel is medium, the cutting performance is general, the welding performance is poor, the sensitivity to the formation of white spots is large, there is temper brittleness.
en-31 alloy5 is one of the most commonly used high-carbon chromium bearing steels with high hardenability and high and uniform hardness after heat treatment. Better wear resistance than GCr9, high contact fatigue strength, good dimensional stability and corrosion resistance, medium cold deformation plasticity, general machinability, poor weldability, sensitive to the formation of white spots, the first type of temper brittleness. In the manufacture of ball bearings, used for rolling wall thickness of 12mm. Outer diameter < 250mm bearing bushing for grades H to C, steel balls with a diameter of 25.4-50.8mm; Diameter < The 22mm roller can also be used to withstand large loads. High wear resistance. High elastic limit. High contact fatigue strength of other mechanical parts and a variety of precision measuring tools cold die. Such as the ball screw of a machine tool, the nozzle of a turbojet engine. Plunger. Valve. Bushing, etc.
The chemical composition of en-31 alloy
C: 0.95-1.05
Mn: 0.20-0.40
Si: 0.15-0.35
S: ≤0.020
P: 0.027 or less
Cr: 1.30 to 1.65
Mo: 0.10 or less
Ni: 0.30 or less
Cu: 0.25 or less
Ni + Cu 0.50 or less
Mechanical property
Supply hardness (HRC):25.8
Tensile strength (MPa):861.3
Yield strength (MPa):518.42
Elongation after fracture (%):27.95
Bending strength (MPa):1821.61
en-31 alloy Product specifications
en-31 alloy Heat treatment
The heat treatment system is: steel rod annealing, steel wire annealing or 830-840 degrees oil quenching.
en-31 alloy heat treatment process parameters
1. Ordinary annealing: 790-810 degrees heating, furnace cooling to 650 degrees, air cooling - HB170-207
2. Isothermal annealing: 790-810 degrees heating, 710-720 degrees isothermal, air cooling -- HB207-229
3. Normalizing: 900-920 degrees heating, air cooling -- HB270-390
4. High temperature tempering: 650-700 degrees heating, air cooling -- HB229-285
5. Quenching: 860 degrees heating, oil quenching - HRC62-66
6. Low temperature tempering: 150-170 degrees tempering, air cooling - HRC61-66
7. Carbonitriding: 820-830 degrees of co-infiltration for 1.5-3 hours, oil quenching, -60 degrees to -70 degrees of cryogenic treatment +150 degrees to +160 tempering, air cooling -- HRC≈67
en-31 alloy manufacturing method
The smelting quality of bearing steel is very high, and the content and distribution of sulfur, phosphorus and non-metallic inclusions need to be strictly controlled, because the content and distribution of non-metallic inclusions have a great impact on the life of bearing steel. The higher the amount of inclusions, the shorter the life. In order to improve the smelting quality, new processes such as vacuum smelting and vacuum consumable refining can also be used to improve the quality of bearing steel.
en-31 alloy Uses
Used for making various bearing rings and rolling parts. For example: the production of internal combustion engines, electric locomotives, automobiles, tractors, machine tools, rolling machines, drilling machines, mining machinery, general machinery, as well as high-speed rotating high-load mechanical transmission bearings of steel balls, rollers and rings. In addition to making balls, bearing rings, etc., it is sometimes used to make tools, such as punching dies and measuring tools.
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