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AISI 8620
Category Steel
Class Alloy steel
Type Standard
Common Names Nickel-chromium-molybdenum steel
Designations  France: AFNOR 20 NCD 2 , AFNOR 22 NCD 2
Germany: DIN 1.6523
Italy: UNI 20 NiCrMo 2
Japan: JIS SNCM 21 , JIS SNCM 21 H
United Kingdom: B.S. 805 H 20 , B.S. 805 M 20
United States: AMS 6274 , AMS 6274G , AMS 6276 , AMS 6276C , AMS 6277 , AMS 6277A , ASTM A322 , ASTM A331 , ASTM A505 , ASTM A513 , MIL SPEC MIL-S-16974 , SAE J404 , SAE J770 , UNS G86200

Composition

ElementWeight %
C  0.18-0.23 
Mn  0.70-0.90 
P  0.035 (max) 
S  0.04 (max) 
Si  0.15-0.30 
Cr  0.40-0.60 
Ni  0.40-0.70 
Mo  0.15-0.25 

Mechanical Properties

Properties Conditions 
T (°C)Treatment
Density (×1000 kg/m3) 7.7-8.03 25  
Poisson's Ratio 0.27-0.30 25  
Elastic Modulus (GPa) 190-210 25  
Tensile Strength (Mpa) 536.4  25  annealed at 870°C  more
Yield Strength (Mpa) 385.4 
Elongation (%) 31.3 
Reduction in Area (%) 62.1 
Hardness (HB) 149  25  annealed at 870°C more
Impact Strength (J)
(Izod)
112.2  25  annealed at 870°C  more
Glossary
3D Scanners

A white paper to assist in the evaluation of 3D scanning hardware solutions.

CNC Machining Design Guide

Optimize your designs, reduce machining time, and lower your costs.

Negotiate Your Salary

Learn the best principles to negotiate the salary you deserve!

Injection Molding Design Guide

Guide for high quality and cost-effective plastic injection molding.