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℃

 


Virgamet in the above grades provides:

 


Virgamet in the above grades provides:

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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