| Note: The following
information represents the results of laboratory development work and
preliminary testing for the new grade. CPM S30V. A full data sheet will be
available upon commercial availability of the grade. CPM S30V is a
martensitic stainless steel specially balanced to insure the formation of
vanadium carbides for high wear resistance properties. CPM S30V also
offers substantial improvements in toughness over other high hardness
materials such as 440C and D2. Corrosion resistance is equal to or better
than 440C in various corrosive environments.
Typical Applications
Long-Wearing Specialty Cutlery
Plastic Injection and Extrusive Feed Screws
Non-Return Valve Components
Palletizing Equipment
Nominal Chemistry
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Stress Relieving
Annealed parts: Heat to 1100 degrees F to 1300 degrees F ( 595-740 degrees
C ). Hold two hours, then furnace cool or cool in still air.
Hardened parts: Heat to 25-50 degrees F ( 15-30 degrees C ) below original
tempering temperature, hold two hours, then furnace cool, or cool in still
air.
Hardening
Austenitize:
1900 - 2000 degrees F ( 1065-1092 degrees C ). Hold time at temperature
15-30 minutes.
Quench:
Air or pressure gas quench (2 bar minimum) to below 125 degrees F ( 50
degrees C) or salt or interrupted oil quench to below 1000 degrees F ( 540
degrees C ) then air cool to below 125 degrees F ( 50 degrees C ).
Temper:
Double temper at 400-750 degrees F (200-400 C). Hold for a minimum of 2
hours each temper. For optimum stress relieving CPM S30V may be tempered
at 1000-1025 degrees F (540-550 C). Tempering in this range may result in
a slight decrease in corrosion resistance. A freezing treatment may be
used between the first and second tempers. freezing treatments help to
attain maximum harden ability and must always be followed by at least one
temper.
Aim Hardness:
58-61 HRC
Size Change in Heat Treatment:
0.0005-0.001 inch per inch growth for a fully martensitic microstructure.
The presence of retained austenite may reduce the net growth. When
tempering at 400-750 degrees F (200-400 C), freezing treatments may be
necessary to minimize retained austenite.
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