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Stainless Steel, 440C

This grade is Cr hardenable Steel, which is capable of attaining, after heat treatment, the highest strength, hardness and wear resistance of all the stainless alloys. With its High Carbon content, this grade is preferred for most Ball Bearing and Valve applications.

Chemical Composition (Weight %)
  C Mn Si P S Cr Mo Ni Cu
Min 0.95
 

16.00 0.40

Max 1.20 1.00 1.00 0.02 0.01 18.00 0.65 0.75 0.50

Typical Mechanical Properties (Min)
Condition Tensile Strength, MPa Yield Strength 0.2%, MPa  Elongation %  Reduction of Area %  Hardness HB
A



255 HB (max)
HT 275 285 2 10 58 HRC
 

Heat Treatment 

1925°F +/-25, held for 30 minutes, oil quenched.   

Decarburization  

Bars ground, turned or polished free from decarburization on the surfaces.  

Related Specifications and Conditions

UNS S51440, AMS5618, AMS5630, AMS5880, 1.4125, ASTM A314, ASTM A493, ASTM A756, ASTM A276, ASTM A473, AMS-QQ-S-763, X105CrMo17, Z100CD17

Available Forms 

Round bar, flat bar, hex bar, sheet, strip, plate, wire, coil, forgings
 
Chemical Composition (Weight %)
  Min Max
C 0.95 1.20
Mn   1.00
Si   1.00
P   0.02
S   0.01
Cr 16.00 18.00
Mo 0.40 0.65
Ni   0.75
Cu   0.50

Typical Mechanical Properties (Min)
Condition A
Tensile Strength, MPa
Yield Strength 0.2%, MPa
 Elongation %
 Reduction of Area %
 Hardness HB 255 HB (max)
HT
Tensile Strength, MPa 275
Yield Strength 0.2%, MPa 285
 Elongation % 2
 Reduction of Area % 10
 Hardness HB 58 HRC

Heat Treatment 

1925°F +/-25, held for 30 minutes, oil quenched.

Decarburization  

Bars ground, turned or polished free from decarburization on the surfaces.  

Related Specifications and Conditions

UNS S51440, AMS5618, AMS5630, AMS5880, 1.4125, ASTM A314, ASTM A493, ASTM A756, ASTM A276, ASTM A473, AMS-QQ-S-763, X105CrMo17, Z100CD17

Available Forms 

Round bar, flat bar, hex bar, sheet, strip, plate, wire, coil, forgings