Type 440A (UNS S44002) Stainless Steel

Type 440A (UNS S44002) Stainless Steel

Type 440A (UNS S44002) Stainless Steel Description Type 440A is a corrosion resistant martensitic stainless steel containing approximately 17% chromium offering a wide range of mechanical properties through heat treatment. This grade offers the superior wear resistance of high carbon steel with...
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Type 440A (UNS S44002) Stainless Steel

Description

Type 440A is a corrosion resistant martensitic stainless steel containing approximately 17% chromium offering a wide range of mechanical properties through heat treatment. This grade offers the superior wear resistance of high carbon steel with the corrosion resistance of a stainless steel. 


The optimum corrosion and hardness are obtained in the hardened and hardened and tempered condition. Type 440A is used for cutlery applications as well as dental and surgical instruments and is magnetic in both the annealed and heat-treated conditions.


Chemical Composition
Chemical Composition (wt%) limits for Type 440A stainless steel*

Element

440A

Carbon

0.60-0.75

Chromium

16.0-18.0

Molybdenum

0.75

Nickel

0.50

Manganese

1.00

Silicon

1.00

Phosphorus

0.040

Sulfur

0.030

* Maximum, unless range is indicated


Mechanical Properties
Typical mechanical property requirements for annealed product

Property

440A

Yield Strength, min. (ksi)

60-62

Tensile Strength, min. (ksi)

65

Elongation, min. (%)

20

Hardness, max. (Rb)

95-96


Physical Properties
Physical properties for Type 440A stainless steel

Property

440A Data

Density, lb/in3

0.280

Modulus of Elasticity, psi

29.0 x 106

Coefficient of Thermal Expansion, 68-212˚F, /˚F

5.6 x 10-6

Thermal Conductivity, Btu/ft hr ˚F

14.0

Specific Heat, Btu/lb ˚F

0.11

Electrical Resistivity, Microohm-in

23.6


Standards
Typical standards for Type 440A stainless steel

440A

ASTM A276


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