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8620
Qilu
Product Description
DIN 1.6523 8620 20CrNiMo Alloy Steel Plate/Flat
1: 8620 Steel Introduction
AISI 8620 Steel is a low alloy nickel, chromium, molybdenum case hardening steel, generally supplied in the as rolled condition with a maximum hardness HB 255max. SAE steel 8620 offers high external strength and good internal strength, making it highly wear resistant.
It has a higher core strength than grades 8615 and 8617. SAE 8620 alloy steel is flexible during hardening treatments, thus enabling improvement of case/core properties. Pre hardened and tempered (uncarburized) 8620 can be further surface hardened by nitriding but will not respond satisfactorily to flame or induction hardening due to its low carbon content.
8620 Steel Stock in warehouse
2: 8620 Quality Standard
EN10250-3 2000 ENG Open die forging alloy steel.pdf
3: 8620 Steel Equivalent
| Country | China | Japan | Germany | USA | British |
| Standard | GB/T 3077 | JIS G4105 | DIN (W-Nr.) EN 10250 | AISI/ASTM ASTM A29 | BS 970 |
| Grade | 20CrNiMo | SNCM220 | 1.6523/21NiCrMo2 | 8620 | 805M20 |
4: 8620 Steel Chemical Composition
| Grade | C | Si | Mn | P | S | Cr | Mo | Ni |
| 805M20 | 0.17-0.23 | 0.1-0.4 | 0.6-0.9 | 0.03 | 0.03 | 0.35-0.65 | 0.15-0.3 | 0.4-0.7 |
| 8620 | 0.18-0.23 | 0.15-0.35 | 0.7-0.9 | 0.035 | 0.04 | 0.4-0.6 | 0.15-0.25 | 0.4-0.7 |
| 1.6523 | 0.17-0.23 | 0.4 | 0.65-0.95 | 0.035 | 0.035 | 0.4-0.7 | 0.15-0.25 | 0.4-0.7 |
| SNCM220 | 0.17-0.23 | 0.15-0.35 | 0.6-0.9 | 0.03 | 0.03 | 0.4-0.65 | 0.15-0.25 | 0.4-0.7 |
5: 8620 Steel Mechanical Properties
The mechanical properties mainly include tensile strength, yield strength, elongation, area or reduction, hardness, impact value, non-metalic inclusion etc. Different heat treatment, the mechanical properties will be different, such as normalized, tempered, QT. If you want to know the properties, please kindly contact the salesman.
6: 8620 Steel Overviews
| Size | Round | Dia 6-1200mm |
| Plate/Flat/Block | Thickness 6mm-500mm | |
| Width 20mm-1000mm | ||
| Heat treatment | Normalized ; Annealed ; Quenched ; Tempered | |
| Surface condition | Black; Peeled; Polished; Machined; Grinded; Turned; Milled | |
| Delivery condition | Forged; Hot rolled; Cold drawn | |
| Test | Tensile strength, Yield strength, elongation, area of reduction, impact value, hardness, grain size, ultrasonic test, US inspection, magnetic particle testing, etc. | |
| Payment terms | T/T;L/C;/Money gram/ Paypal | |
| Trade terms | FOB; CIF; C&F; etc.. | |
| Delivery time | 30-45 days | |
7: 8620 Steel Application
8620 alloy steels are used for Arbors, Bearings, Bushings, Cam Shafts, Differential Pinions, Guide Pins, King Pins, Pistons Pins, Gears, Splined Shafts, Ratchets, Sleeves and other applications where it is helpful to have a steel that can be readily machined and carburized to controlled case depths.
8: ASTM 8620 Steel Heat treatment
Annealing
AISI 8620 steel may be given a full anneal by heat to 820℃ – 850℃, and hold until temperature is uniform throughout the section and cool in furnace or air cooled.
Tempering
Tempering of heat treated and water quenched parts of 8620 steels (not carburized) is done at 400 F to 1300 F to improve case toughness with minimal effect on its hardness. This will also reduce the possibility of grinding cracks.
Hardening
The AISI steel 8620 will be austenitized at around 840°C – 870°C, and oil or water quenched depending upon section size and intricacy. Cool in Air or Oil required.
Normalizing
1675oF (910oC) and air cool. This is another method of improving machinability in 8620 material; normalizing might also be used prior to case hardening.
9: 8620 Steel Delivery condition
For hot forged or hot rolled bar, usually the delivery condition is hot forged, annealed/QT, rough turned/Black surface or hot rolled, annealed/QT, Black surface.
