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This 17Cr/4Ni precipitation hardening stainless steel has a combination of high hardness and strength after suitable heat treatment. It also has similar corrosion and heat resistance to Type 304.
Corrision Resistance:
Excellent resistance to the same range of corrosive environments as Atlas Type 304 stainless steel.
Heat Resistance:
Good oxidation resistance. To preserve mechanical properties and hardness do use above 900 degrees F.
Heat Treatment
Solution anneal-heat at 1900 degrees F for one half hour and cool to 90 degrees F maximum in air. Oil quenching may be used for small non-intrecate sections.
Hardening
A single low temperature process is employed. Heat to 900 degrees - 1150 degrees F 1 to 4 hours and air cool. Typical hardness values after hardening are:
Hardening Temperature
(degrees F) |
Typical Hardeness
Rockwell C |
900
925
1025
1075
1100
1150
| 44
32
48
36
35
33
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A decrease in size (shrinkage) takes place during the hardening process, and this change must be allowed for in prior manufacturing operations.
The magnitude of the size change is temperature dependent -
900 degrees F - .0005" approx.
1150 degrees F - .001" approx.
Welding
Can be successfully welded by all standard methods. Preheating is not necessary. Properties comparable to those of the parent metal may be achieved in the weld metal by appropriate post-weld heat treatment. Somewhat low weld metal ductility may give rise to notch sensitivy. Precaution should be taken in design and welding proceedures to avoid concentration of weldmelt stresses.
Typical Applications
Gears
Valves
Power plant
Plastic molding dies
High strength shafts
Engine parts
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