SAE8620 Case Hardening Steel is a low-alloy nickel, chromium, molybdenum steel known for its high strength, wear resistance, and toughness.
At Mascot Steel Centre, we manufacture SAE8620 Case Hardening Steel to meet the demands of automotive, aerospace, and industrial applications.
This case hardening steel is highly machinable and provides exceptional core strength, making it ideal for gears, camshafts, fasteners, and chain pins.
All our SAE8620 Case Hardening Steel products undergo rigorous testing and are supplied with certification to ensure top performance.
SAE8620 Grade Introduction:
SAE8620 Alloy Steel is a low alloy nickel, chromium, molybdenum case hardening steel, generally supplied in the as-rolled condition with a maximum hardness HB 255max. SAE8620 alloy steel offers high external strength and good internal strength, making it highly wear-resistant. SAE 8620 steel has a higher core strength than grades 8615 and 8617.
SAE8620 alloy steel is flexible during hardening treatments, thus enabling improvement of case/core properties. Prehardened and tempered (uncarbonized) 8620 can be further surface hardened by nitriding but will not respond satisfactorily to flame or induction hardening due to its low carbon content. SAE 8620 alloy steel is suited for applications that require a combination of toughness and wear resistance. This grade is commonly supplied in a round bar.
SAE8620 Grade Application:
The SAE 8620 can be used for a number of medium-strength applications such as camshafts, fasteners, gears, and chains/chain pins.
SAE 8620 Hardness:
149
SAE 8620 Heat treatment:
This alloy may be hardened by heating to 1500 F followed by a water quench. Carburize at 1650 to 1700 F in an appropriate carburizing medium and oil quench to harden. Improved carburized case and core properties can be obtained by furnace cooling from carburizing at 1650 – 1700 F and then reheating to 1575 F.
SAE 8620 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.
SAE 8620 Tempering:
Tempering of heat-treated and water quenched parts of SAE 8620 steel (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.
SAE 8620 Forging Properties:
SAE 8620 alloy steel is forged at a start temperature of around 2250ºF (1230ºC) down to approximately 1700ºF(925ºC.) prior to the hardening heat treatment or carburizing. The alloy is air cooled after forging.
SAE 8620 Stress Relieving:
Heat to 630°C – 650°C, hold until temperature is uniform throughout the section, soak for 1 hour per 25mm section, and cool in still air.
SAE 8620 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.
SAE 8620 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 the furnace or air-cooled.
SAE 8620 Density:
Density (lb / cu. in.) 0.283
SAE 8620 Machinability:
The SAE 8620 alloy steel is readily machined after heat treatment and/or carburizing, should be at a minimum so as not to impair the hardened case of the part. Machining may be done by conventional means prior to heat treatment – after carburizing machining is usually limited to grinding.
SAE 8620 Welding:
The alloy SAE 8620 may be welded as-rolled condition by conventional methods, usually gas or arc welding. Preheating at 400 F is beneficial and subsequent heating after welding is recommended – consult the approved weld procedure for the method used.
| USA | DIN | BS | BS | JAPAN |
|---|---|---|---|---|
| ASTM A29 8620 | DIN 1654 1.6523/21NiCrMo2 | EN 10084 1.6523/21NiCrMo2-2 | BS 970 805M20 | JIS G4103 SNCM220 |
| Standard | Grade | C | Mn | P | S | Si | Ni | Cr | Mo |
|---|---|---|---|---|---|---|---|---|---|
| ASTM A29 | 8620 | 0.18–0.23 | 0.7–0.9 | 0.035 | 0.040 | 0.15–0.35 | 0.4–0.7 | 0.4–0.6 | 0.15–0.25 |
| DIN 1654 | 1.6523/21NiCrMo2 | 0.17–0.23 | 0.65–0.95 | 0.035 | 0.035 | ≤0.40 | 0.4–0.7 | 0.4–0.7 | 0.15–0.25 |
| EN 10084 | 1.6523/21NiCrMo2-2 | 0.17–0.23 | 0.65–0.95 | 0.025 | 0.035 | ≤0.40 | 0.4–0.7 | 0.35–0.70 | 0.15–0.25 |
| JIS G4103 | SNCM220 | 0.17–0.23 | 0.6–0.9 | 0.030 | 0.030 | 0.15–0.35 | 0.4–0.7 | 0.4–0.65 | 0.15–0.3 |
| BS 970 | 805M20 | 0.17–0.23 | 0.6–0.95 | 0.040 | 0.050 | 0.1–0.4 | 0.35–0.75 | 0.35–0.65 | 0.15–0.25 |
| Property | Metric | Imperial |
|---|---|---|
| Tensile strength | 530 MPa | 76900 psi |
| Yield strength | 385 MPa | 55800 psi |
| Elastic modulus | 190–210 GPa | 27557–30458 ksi |
| Bulk modulus (typical for steel) | 140 GPa | 20300 ksi |
| Shear modulus (typical for steel) | 80 GPa | 11600 ksi |
| Poisson's ratio | 0.27–0.30 | 0.27–0.30 |
| Izod Impact | 115 J | 84.8 ft·lb |
| Hardness, Brinell | 149 | 149 |
| Hardness, Knoop (converted) | 169 | 169 |
| Hardness, Rockwell B (converted) | 80 | 80 |
| Hardness, Vickers (converted) | 155 | 155 |
| Machinability (hot rolled & cold drawn, based on 100 for AISI 1212) | 65 | 85 |
| Property | Metric | Imperial |
|---|---|---|
| Density | 7.85 g/cm³ | 0.284 lb/in³ |
| Property | Metric | Imperial |
|---|---|---|
| Thermal conductivity | 46.6 W/m·K | 323 BTU·in/hr·ft²·°F |
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