440 Stainless Steel Machining

Stainless Steel Alloy 440

Stainless steel alloy 440 is a high-carbon alloy, ideal for parts that require hardness and strength. It has the highest wear resistance, hardness, and strength of any stainless steel alloy. 440 is not recommended for elevated temperatures or environments that may have severe corrosion.

440 has a machining cost factor of 6.3 when compared to steel 12L14.  It is not ideal for welding or forming. 440 can be forged, heat treated, and annealed.

Industries & Applications

  • Pins
  • Bearings
  • Surgical and dental parts
  • Valve components

Stainless Steel Parts Gallery

Stainless Steel 440 Characteristics

TEMPER

Yield Strength

Ultimate Tensile Strength

Modulus of Elasticity

Brinell Hardness (500kg/10mm)

A

60-240

105-260

30,000

95

C

65-280

110-290

30,000

100

Stainless Steel Cost Comparison

Type General Characteristics Alloy Common Applications Tolerances for a 1/2" Dia. Bar Material Cost Factor Machining Cost Factor
Stainless Steel
High carbon, can harden to RC 60
440
Applications requiring stainless steel with highest hardness
  5.9 5.0

Common Material Cost Comparison

Type General Characteristics Alloy Common Applications Tolerances for a 1/2" Dia. Bar Material Cost Factor Machining Cost Factor
Steel
Designed for excellent machinability. Case hard only
12L14
Endless commercial products; probably more pounds used in turned products than any other bar stock
Cold drawn
0
1 1
Stainless Steel
Designed for machining, non-magnetic
303
Electronic hardware, automotive, aerospace, medical instruments, and many applications requiring corrosion resistance
Cold finished
+/- .002
1.9 2.7
Brass
Strength, corrosion and wear resistance, and excellent machinability
C35300
Well suited for parts with knurling or threading
+0015 3.5 .07
Aluminum
Designed for machining
2011
Electronic hardware, endless commercial products
Cold finish
+/-.0015
3.8 .6
Titanium
High strength, light weight, good bio-compatibility
Ti-6Al-4VEli
Medical implants
Ground & polished
+/-.002
30.2 6

To review our Machining Materials Guide, please click here.

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