ASTM 440A, UNS S44002 High Carbon Martensitic Stainless Steel Strips, Coils, Sheets, Plates

AISI 440A, a high-carbon high-chromium martensitic stainless steel designed to provide stainless properties with excellent hardness.

It has moderate corrosion resistance as-annealed which has permitted its use in mild environments. In some respects it behaves similarly to tool steels.

Type 440A ( C 0.60 - 0.75, Cr 16.0 - 18.0 ) attains a hardness of Rockwell C 56 and maximum toughness when heat treated.

Type 440A has been used for pivot pins, dental and surgical instruments, cutlery, valve parts, etc.

Delivery state

Soft Annealed

Heat treatment

Annealing

For maximum softness, this steel should be heated uniformly to 1550/1600ºF (843/871°c).

Soak and cool very slowly in the furnace. Brinell approximately 223.

Intermediate or process annealing treatment---heat uniformly to 1350/1400ºF (732/760°c).

May be cooled in the furnace or air cooled. Brinell hardness about 230.

Hardening

Preheat to 1400/1500ºF (760/816°c), then heat to 1850/1950ºF (1010/1066°c); soak; quench in warm oil or cool in air.

Do not overheat.

When overheated, full hardness cannot be obtained.

Tempering

Hardness of approximately Rockwell C 56/57 will be obtained on this steel.

To remove peak stresses and yet retain maximum hardness temper at least one hour at 300/350ºF (148/176°c).

We are specialised in stainless martensitic steels. products in forms of hot- and cold-rolled sheet, plate, strip, coil and profiles.

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