(AISI 440C Modified)
The exceptional wear resistance and good corrosion resistance of CPM S60V make it an excellent candidate to replace 440C and other corrosion and wear resistant materials, particularly where increased wear resistance is a primary concern.
| Typical Chemistry | |
| Carbon | 2.15% |
| Manganese | 0.40% |
| Silicon | 0.40% |
| Chromium | 17.00% |
| Vanadium | 5.50% |
| Molybdenum | 1.00% |
| Typical Applications | |
| Plastic injection and extrusion screw and barrel components |
|
| Wear components for food, plastic, and chemical processing equipment |
|
| Pelletizing knives Rolls | |
| Slitters, cutters, chipper knives |
|
| Bearings, bushings, cams, gears, valves |
|
- Annealed Hardness: BHN 255/277.
Machinability and Grindability
Due to its high vanadium carbide content, the machinability and grindability of S60V will be slightly more difficult than that of D2 or 440C. Similar grinding equipment and practices are acceptable. SG type alumina wheels or CBN wheels have generally given the best performance with the CPM steels.
Thermal Treatments
Critical Temperature: 1580F(860C).
Forging: Heat to 2100F(1150C). Do not forge below 1750F(954C). Slow cool or anneal after forging.
Annealing: 1625/1650F(885/900C), hold 2 hours, slow cool 25F(15C) per hour max. to 1000F(540C), then air or furnace cool. Hardness BHN 255/277.
Stress Relieving (before hardening): 1100-1350F(595-730C), hold 2 hrs. and air or furnace cool.
Straightening: Best done warm 400-900F(200-480C), preferably during quenching.
Hardening: (Salt, vacuum or atmosphere)
Preheat: 1500-1550F(815-845C), equalize.
High Heat: 1850-2050F(1010-1120C), 10 to 30 minute hold time at temperature.
Quench: Salt, interrupted oil or atmosphere quench to 1000-1100F(540-595C), equalize, then air cool to below 125F(50C) or hand warm. Vacuum or atmosphere quench rate through 1850-1300F(1010-705C) range is critical to achieve optimum heat treat results. Salt or interrupted oil quench is recommended for sections over 3" thick where maximum hardness is required.
Temper: 400/750F(200/400C) recommended. Double tempering is required. Tempering in the range of 800/1050F(425/565C) is not recommended due to a resulting drop in both toughness and corrosion resistance.
Standard recommendation to achieve HRC 56-58 after tempering is to use 2000/2050F(1095/1120C) hardening, 450/500F(230/260C) tempering.
Deep Freezing (optional): When hardened from 1950F(1065C) or higher, deep freezing may be employed to reduce retained austenite. For best safety and effectiveness, freezing should be performed between the first and second temper if possible. Freezing should always be followed by tempering.
| Hardening Data |
||||
|
|
||||
|
|
(air cooled) |
|||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
||||
|
|
(salt/oil quenched) |
|||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
||||
| Size Change During Hardening | |||||
|
|
|||||
|
|
|
|
||
|
|
|
|
|
||
|
|
|||||
|
|
|
|
|
|
|
|
|
|||||
|
|
|||
|
|
HRC |
Charpy C-notch |
|
|
|
|
||
|
|
|||
| CPM S60V |
56 (1) |
16 |
22 |
| CPM S60V |
59 (2) |
12 |
16 |
| CPM S60V |
60 (3) |
11 |
15 |
| AISI 440C |
56 |
26 |
35 |
| AISI D2 |
59 |
21 |
29 |
|
|
|||
| Notes: Hardening temperatures: (1) 1850F(1010C), (2) 1950F(1065C), (3) 2050F(1120C). |
|||
Because of its usual low tempering temperature, CPM S60V is not usually readily nitrided or TiN coated.
Physical Properties
Modulus of Elasticity ...................................................................30 psi x 106 (207 GPa)
Specific Gravity ..............................................................................................................7.47
Density .......................................................................................0.270 lb/in3 (7470 kg/m3)
Thermal Conductivity (at room temperature)
................................ 9.7 BTU/hr/ft/°F(0.04 Cal/cm2/sec/°C)
Coefficient of Thermal Expansion
|
|
||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|