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AISI 5140
Category Steel
Class Alloy steel
Type Standard
Common Names Chromium steel
Designations  France: AFNOR 42 C 2 , AFNOR 42 C 4
Germany: DIN 1.7035
Italy: UNI 40 Cr 4 , UNI 41 Cr 4 KB
Japan: JIS SCr 4 H
United Kingdom: B.S. 2 S 117 , B.S. 530 A 40 , B.S. 530 H 40 , B.S. 530 M 40
United States: ASTM A322 , ASTM A331 , ASTM A505 , ASTM A519 , SAE J404 , SAE J412 , SAE J770 , UNS G51400

Composition

ElementWeight %
C  0.38-0.43 
Mn  0.70-0.90 
P  0.035 (max) 
S  0.04 (max) 
Si  0.15-0.30 
Cr  0.70-0.90 

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) 572.3  25  annealed at 830°C  more
Yield Strength (Mpa) 293.0 
Elongation (%) 28.6 
Reduction in Area (%) 57.3 
Hardness (HB) 167  25  annealed at 830°C more
Impact Strength (J)
(Izod)
40.7  25  annealed at 830°C  more

Thermal Properties

Properties Conditions 
T (°C)Treatment
Thermal Expansion (10-6/ºC) 15  20-700 more annealed 
Thermal Conductivity (W/m-K) 44.8  100 more  
Specific Heat (J/kg-K) 452  50-100 more  

Electric Properties

Properties Conditions 
T (°C)Treatment
Electric Resistivity (10-9W-m) 228  20 more  
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