AISI 8620 Alloy Steel Round Bar | 21NiCrMo2

 AISI 8620 Alloy Steel Round Bar  | 21NiCrMo2
 AISI 8620 Alloy Steel Round Bar  | 21NiCrMo2
 AISI 8620 Alloy Steel Round Bar  | 21NiCrMo2
 AISI 8620 Alloy Steel Round Bar  | 21NiCrMo2

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AISI 8620 Alloy Steel Round Bar | 21NiCrMo2

Alloy steels contain a wide range of steels whose compositions exceed the limitations of C, Mo, Cr, Va, Mn, Ni, Si, and B fixed for carbon steels. These steels are more responsive to mechanical and heat treatments than carbon steels.

AISI 8620 alloy steel is a common, carburizing alloy steel. This alloy steel is flexible during hardening treatments, thus enabling improvement of case/core properties. The following datasheet will provide more details about AISI 8620 alloy steel.

Dimensions
Hot Rolled Round: dia.16-300 mm
Forged Round: dia.150-1200 mm
Cold Drawn Round: dia.6-30 mm
Forged Block: 150-1000 x 200-1900 mm
Delivery Condition
EAF+LF+VD, Hot Rolled or Forged or Cold Drawn, Annealed or Q+T, Black surface or Machined surface, UT SEP1921 Class3 C/c or D/d
Equivalence
AISI / SAE DIN / W.Nr JIS GB
8620 21NiCrMo2 1.6523 SNCM220 20CrNiMo
Other designations that are equivalent to AISI 8620 alloy steel include the following:
AISI 8620 AMS 6274 AMS 6276 AMS 6277 AMS 6375 ASTM A29
ASTM A322 ASTM A331 ASTM A506 ASTM A507 ASTM A513 ASTM A519
ASTM A646 ASTM A752 ASTM A829 MIL S-8690 SAE J1397 SAE J404
AFNOR 20 NCD 2 AFNOR 22 NCD 2 DIN 1.6523 UNI 20 NiCrMo 2 JIS SNCM 21 JIS SNCM 21 H
B.S. 805 H 20 B.S. 805 M 20 AMS 6274G AMS 6276C AMS 6277A ASTM A505
MIL SPEC MIL-S-16974 SAE J404 SAE J770      
Chemical Composition (%)
Steel Grade C Si Mn P S Cr Mo Ni
21NiCrMo2 1.6523 0.17-0.23 ≤ 0.40 0.65-0.95 ≤ 0.035 ≤ 0.035 0.35-0.70 0.15-0.25 0.40-0.70
8620 0.18-0.23 0.15-0.35 0.70-0.90 ≤ 0.030 ≤ 0.040 0.40-0.60 0.15-0.25 0.40-0.70
Applications
The AISI 8620 can be used for a number of medium-strength applications such as camshafts, fasteners, gears, and chains/chain pins.
Mechanical Properties

The mechanical properties of annealed AISI 8620 alloy steel are outlined in the table below.

Properties 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 from Brinell hardness) 169 169
Hardness, Rockwell B (converted from Brinell hardness) 80 80
Hardness, Vickers (converted from Brinell hardness) 155 155
Machinability (hot rolled and cold drawn, based on 100 machinability for AISI 1212 steel) 65 65
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