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AISI 4130
Category Steel
Class Alloy steel
Type Standard
Common Names Chromium-molybdenum steel
Designations  France: AFNOR 25 CD 4 (S)
Germany: DIN 1.7218
Italy: UNI 25 CrMo 4 , UNI 25 CrMo 4 KB
Japan: JIS SCCrM 1 , JIS SCM 2
Sweden: SS 2225
United Kingdom: B.S. CDS 110
United States: AMS 6350 , AMS 6350D , AMS 6351A , AMS 6356 , AMS 6360 , AMS 6360F , AMS 6361 , AMS 6362 , AMS 6370 , AMS 6370F , AMS 6371 , AMS 6371D , AMS 6373 , AMS 6373A , ASTM A322 , ASTM A331 , ASTM A505 , ASTM A513 , ASTM A519 , ASTM A646 , MIL SPEC MIL-S-16974 , SAE J404 , SAE J412 , SAE J770 , UNS G41300

Composition

ElementWeight %
C  0.28-0.33 
Mn  0.40-0.60 
P  0.035 (max) 
S  0.04 (max) 
Si  0.15-0.30 
Cr  0.80-1.10 
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) 560.5  25  annealed at 865°C  more
Yield Strength (Mpa) 360.6 
Elongation (%) 28.2 
Reduction in Area (%) 55.6 
Hardness (HB) 156  25  annealed at 865°C more
Impact Strength (J)
(Izod)
61.7  25  annealed at 865°C  more

Thermal Properties

Properties Conditions 
T (°C)Treatment
Thermal Conductivity (W/m-K) 42.7  100 more  
Specific Heat (J/kg-K) 477  50-100 more  

Electric Properties

Properties Conditions 
T (°C)Treatment
Electric Resistivity (10-9W-m) 223  20 more  
Glossary