Description
STELLITE 12 ALLOY
NOMINAL COMPOSITION (MASS %) AND PHYSICAL PROPERTIES
|
Co |
Cr |
W |
C |
Others |
Hardness |
Density |
Melting Range |
|
Base |
27-32 |
7.5-9.5 |
1.4-1.7 (hardfacings) 1.7-2.0 (castings) |
Ni, Fe, Si, Mn |
45-51 HRC 435-590 HV |
8.53 g/cm3 0.308 lb/in3 |
2192-2489 ºF 1200-1365 ºC |
StelliteTM cobalt base alloys consist of complex carbides in an alloy matrix. They are resistant to wear, galling and corrosion and retain these properties at high temperatures. Their exceptional wear resistance is due mainly to the unique inherent characteristics of the hard carbide phase dispersed in a CoCr alloy matrix.
StelliteTM 12 could be considered an intermediate alloy between StelliteTM 6 and StelliteTM 1. It contains a higher fraction of hard, brittle carbides than StelliteTM 6, and has increased resistance to lowangle erosion, abrasion, and severe sliding wear whilst retaining reasonable impact and cavitation resistance. StelliteTM 12 is often used self-mated or running against StelliteTM 6 or StelliteTM 1. The higher tungsten content provides better high- temperature properties compared to StelliteTM 6, and it can be used at temperatures up to about 700˚C.
StelliteTM 12 is typically used for cutting tools that need to withstand abrasion, heat and corrosion. Examples include industrial knives for cutting carpets, plastics, paper and synthetic fibres; and saw tips in the timber industry. It is also used for control plates in the beverage industry, pump vanes, bearing bushes and narrowneck glass mold plungers; and for hardfacing of engine valves, pinch rollers in the metal-processing industries, and rotor blade edges.
Optical Micrograph of a StelliteTM 12 PTA Deposit at 500X.
CORROSION RESISTANCE
The typical electrode potential in sea water at room temperature is approximately -0.3 V (SCE). Like stainless steels, StelliteTM 12 corrodes primarily by a pitting mechanism and not by general mass loss in seawater and chloride solutions. Information regarding corrosion resistance in other corrosive environments can be provided on request.
NOMINAL THERMAL EXPANSION COEFFICIENT (FROM 20°C TO STATED TEMPERATURE)
|
|
100°C (212°F) | 200°C (392°F) | 300°C (572°F) | 400°C (752°F) | 500°C (932°F) | 600°C (1112°F) | 700°C (1292°F) | 800°C (1472°F) | 900°C (1652°F) | 1000°C (1832°F) |
|
µm/m.K |
11.5 | 12.1 | 12.6 | 12.9 | 13.3 | 13.8 | 14.3 | 14.8 | 15.2 |
15.6 |
| µ-inch/inch.°F | 6.4 | 6.7 | 7.0 | 7.2 | 7.4 | 7.7 | 7.95 | 8.2 | 8.45 |
8.7 |
NOMINAL TENSILE PROPERTIES AT ROOM TEMPERATURE
|
Ultimate Tensile Strength Rm |
Yield Stress Rp(0.2%) | Elongation |
Elastic Modulus |
||||
|
ksi |
MPa | ksi | MPa | A(%) | psi |
GPa |
|
|
Castings |
107 | 740 | 84 | 580 | <1 | 32.8×106 |
226 |
| Stellite HS-12 (*) | 174 | 1200 | 130 | 900 | 2 | 30.1×106 |
208 |
(*) “HS” = HIP-consolidated from the powder form
NOMINAL HOT HARDNESS (DPH) AS-CAST
|
20°C (68°F) |
100°C (212°F) | 200°C (392°F) | 300°C (572°F) | 400°C (752°F) | 500°C (932°F) | 600°C (1112°F) | 700°C (1292°F) | 800°C (1472°F) | 900°C (1652°F) |
| 546 | 456 | 418 | 390 | 380 | 371 | 362 | 328 | 232 |
153 |
|
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THERMAL AND ELECTRICAL PROPERTIES
PRODUCT FORMS AND CROSS REFERENCE SPECIFICATIONS
StelliteTM 12 is available as welding wire, rod, powder, and electrodes; finished castings and P/M parts. Kennametal Stellite also offers hardfacing services.
StelliteTM 12 can be supplied to the following specifications:
DM unit
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