20NiCrMo2-2, 1.6523, AISI 8620 - Case-hardening steel
Case-hardening steel 20NiCrMo2-2, 1.6523, AISI 8620, 805M20 for heavy duty parts of machines and vehicles according to and EN 10084.
| Standards | Steel Grades | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chemical Composition % | ||||||||||||||
| C: | Mn: | Si: | P: | S: | Cr: | Mo: | Ni: | V: | Al: | Ti: | Cu: | N: | W: | |
| PN | 20HNM | |||||||||||||
| 0.17 - 0.23 | 0.6 - 0.9 | 0.17 - 0.37 | <0.035 | <0.035 | 0.35 - 0.65 | 0.15 - 0.25 | 0.35 - 0.75 | - | - | - | - | - | - | |
| EN | 20NiCrMo2-2 - 20 NiCrMo 2-2 - 21NiCrMo2 - 21 NiCrMo 2- 1.6523 | |||||||||||||
| 0.17 - 0.23 | 0.65 - 0.95 | <0.4 | <0.025 | <0.035 | 0.35 - 0.70 | 0.15 - 0.25 | 0.4 - 0.7 | - | - | - | - | - | - | |
| ISO | 20NiCrMo2F - 20NiCrMo2 - 20 NiCrMo 2 - 1.6522 | |||||||||||||
| 0.17 - 0.23 | 0.60 - 0.95 | <0.4 | <0.025 | <0.030 | 0.35 - 0.65 | 0.15 - 0.25 | 0.4 - 0.7 | - | <0.05 | - | <0.3 | - | - | |
| AFNOR | 20NCD2 - 20 NCD 2 | |||||||||||||
| 0.17 - 0.23 | 0.65 - 0.95 | 0.10 - 0.35 | <0.03 | <0.025 | 0.40 - 0.65 | 0.15 - 0.25 | 0.4 - 0.7 | - | <0.02 | - | - | - | - | |
| DIN | 20NiCrMoS2-2 - 20 NiCrMoS 2-2 - 21NiCrMoS2 - 21 NiCrMoS 2 - 1.6526 | |||||||||||||
| 0.17 - 0.23 | 0.65 - 0.95 | <0.4 | <0.025 | 0.02 - 0.04 | 0.35 - 0.70 | 0.15 - 0.25 | 0.4 - 0.7 | - | - | - | - | - | - | |
| GOST | 20HGNM - 20ChGNM - 20KhGNM - 20ХГНМ | |||||||||||||
| 0.18 - 0.23 | 0.7 - 1.1 | 0.17 - 0.37 | <0.035 | <0.035 | 0.4 - 0.7 | 0.15 - 0.25 | 0.4 - 0.7 | <0.05 | - | <0.03 | <0.3 | <0.008 | <0.2 | |
| SAE | J1268 - AISI 8620H - 8620 H - UNS H86200 | |||||||||||||
| 0.17 - 0.23 | 0.60 - 0.95 | 0.15 - 0.35 | <0.035 | <0.040 | 0.35 - 0.65 | 0.15 - 0.25 | 0.35 - 0.75 | - | - | - | - | - | - | |
20NiCrMo2-2, 1.6523 - specification and applications
20HNM steel is a structural alloy steel from a group of carbonaceous materials that is used as a semi-finished product for heavy-duty component, subject to varying loads, high pressures and impacts, requiring high core strength and hard surface.
20HNM materials are intended for components and subassemblies of agricultural vehicles, motor vehicles and machinery for components such as cogwheels, bolts, bearings, shafts working at high speeds, pins or disc wheels.
Products of this grade are supplied in the form of hot rolled bars, forged bars, forgings, rings, and wires. 20HNMA steel according to PN-H-93028, is also used for the production of chain links.
General mechanical properties of 20NiCrMo2-2 steel and its equivalents
- Tensile strength, Rm = 660 - 1160 MPa
- Yield point, Re = 470 - 560 MPa
- Notch toughness, KU = 25 - 30 J
- Elongation, A = 9 - 11%
- Hardness = max 229 HB
- Density = 7.85 g/cm3
Heat treatment - processes, temperature and cooling
- Normalizing annealing at 860 - 900 °C
- Softening annealing at 650 - 700℃
- Carburizing at 880 950℃
- Carbonitriding at 860 - 930℃
- The first hardening after carburizing with cooling in water or oil at 860 - 900 °C
- Annealing after carburization at 660 - 680℃
- The second hardening after carburization with cooling in oil or water at 810 - 830 ℃
- Tempering at 150 - 200℃
Substitutes, equivalents and other species designations
20NiCrMo2-2
20 HNM
20 NiCrMo 2-2
21NiCrMo2
21 NiCrMo 2
1.6523
6523
20NiCrMo2-1
20NiCrMo3
20NiCrMo2F
1.6522
20NiCrMo2
20NCD2
20 NCD 2
20NiCrMo7
22NCD2
22HNM
20 NiCrMo 7
SAE 8620
AISI 8620H
J1268
8620 H
UNS H86200
806M20
806 M 20
20NiCrMoS2-2
20 NiCrMoS 2-2
20Ni2Cr2Mo2
20NiCrMo2HH
20NiCrMo2H
20HNMA
20NiCrMo2HL
20NiCrMoS2H
SNCM 220
22HNM
20MoCrNi06
20 MoCrNi 06
1.3576
1.6526
1.6522
8617H
UNS H86170
20CrNiMo
20NiCrMo2KD
20HGNM
20ChGNM
20KhGNM
20ХГНМ
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