40Cr steel is one of the most widely used steels in machinery manufacturing. Good overall mechanical properties after quenching and tempering, good low temperature impact toughness and low notch sensitivity. The steel has good hardenability, and can be hardened to 28 to 60 mm when water quenching, and hardened to 15 to 40 mm when oil quenching. This steel is also suitable for cyanidation and high frequency quenching in addition to quenching and tempering. The cutting performance is good. When the hardness is 174 to 229HB, the relative machinability is 60%. The steel is suitable for making medium plastic molds.

 

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

 

Element

Weight %

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

 

Elongation (%)           26.8    

 

Hardness (HB)              167        25  

 

Yield Strength (Mpa)         293.0

 

Tensile Strength (Mpa)       572.3

 

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