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Grade 21NiCrMo2
Germany W-Nr. 1.6523
Corresponding Standard DIN 17210-1986
Case Hardening Steels – Technical Delivery Conditions
Classification Alloy Steel
Properties Carburizing Ability
21NiCrMo2 Chemical Element Composition Content (%)
Component C Si Mn P S Cr Ni Mo
Minimum Value 0.17 - 0.65 - - 0.4 0.4 0.15
Maximum Value 0.23 0.4 0.95 0.035 0.035 0.7 0.7 0.25
21NiCrMo2 Mechanical Properties
condition Heat Treatment or Condition
Hardness
HBW
All product shapes Softening Annealing (G) ≤197
Bars, wire, plates, forgings; d≤150 Processed to a Certain Strength (BF) 152~201
Bar stock, plate, forgings; d≤60 Processed to Ferrite-Perlite Structure (BG) 145~192
New and Old Grade Replacement List
Corresponding Standard Grade
DIN 17210-1986
Grade
Germany W-Nr.
DIN EN 10084-2008
Grade
Germany W-Nr.
DIN EN ISO 683-3-2019
Grade
1 Approximate Comparison Table Structural Alloy Steel
China Taiwan, China Japan South Korea United States International Organization for Standardization Germany France Russia Sweden United Kingdom
GB ISC CNS JIS KS ASTM/AISI UNS ISO DIN EN/DIN W-Nr. NF EN/NF GOST SS14 BS EN/BS
20CrNiMo A50202 SNCM220 SNCM220 SNCM220 8620 G86200 20NiCrMo2 21NiCrMo2 1.6523 20NCD2 20ХНМ 2506 805M20
2 Approximate Comparison Table Hardenability Guaranteed Structural Steel
China Taiwan, China Japan South Korea United States International Organization for Standardization Germany France Russia Sweden United Kingdom
GB ISC CNS JIS KS ASTM UNS ISO DIN EN/DIN W-Nr. NF EN/NF GOST SS BS EN/BS
20CrNiMoH A50205 SNCM220H SNCM220H SNCM220H 8620H H86200 20NiCrMo2H 20NiCrMo2-2 1.6523 20NiCrMo2-2 20ХГНМ 2506 (805H17)
3 Approximate Comparison Table Case-Carburized Bearing Steel
China Taiwan, China South Korea United States International Organization for Standardization Germany France Sweden United Kingdom
GB ISC CNS KS ASTM/AISI ISO DIN EN/DIN W-Nr. NF EN/NF SKF BS EN/BS
G20CrNiMo B12200 SNCM220 SNCM220 A534 8620H 20NiCrMo2
(B28) 		21NiCrMo2 1.6523 21NiCrMo2
(20NCD2) 		SKF152 805 A20
4 Approximate Comparison Table Structural Alloy Steel
China Japan International Organization for Standardization Germany France European Standard Russia United Kingdom
GB JIS ISO DIN EN/DIN NF EN/NF EN Numerical Grade GOST BS EN/BS
20CrNiMoH SNCM220
SNCM220H 		20NiCrMo2-2
20NiCrMo2 		21NiCrMo2 20NCD2 20NiCrMo2-2 1.6523 20KHGNM 805M20
21NiCrMo2 Corresponding Standards(Same grade name, different standards)
1 DIN 17210-1986
21NiCrMo2 1.6523
2 DIN 1654-3-1989
21NiCrMo 2 1.6523

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