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Typical Coatings applied for Severe Service Ball Valves:
HVOF Overlays
CFS131: "chrome carbide", 65-70 HRC, 80% Cr2/C3 and 20% Ni-Cr, tough and wear resistant to 1400 F (760C).
CFS100: "tungsten carbide", 70+ HRC, 88% Wc and 12% Co, extremely hard and wear resistant. Good for most non-corrosive applications below 1000 F (535 C).
CFS106: "Stellite 6", 47-49 HRc, 28% Cr and 62% Ni (Bal Wc and Fe), mostly used as a bond coat but resistant to wear and errosion to 1500F (815C).
CFS121: "86-10-4", 69-71 HRc, 86% Wc, 10% Co and 4% Cr, greater corrosion resistance than CFS100 and used with small amounts of corrosives for temperatures to 1000 F (540 C).
Other Types
We use a variety of systems to apply coatings like tungsten carbide with a Hastelloy binder, tantalum chrome oxide (CFS200) for autoclaves in gold and nickel mines, titanium dioxide, etc. There are literally 100's of coatings available. When uncertain, ask our Chemical Engineering Department for advice.
EXAMPLE-TUNGSTEN CARBIDE COATINGS
CFS 100 is an excellent solution for high wear applications requiring a coating thickness NO greater than 0.012”. CFS 100 is the result of thermal spray technology which produce coatings with a high concentrations of carbide particles and high bond strengths. Carbide coatings are very useful for a host of applications which include mixing bowls, the repair of drilling tools, compressor rods and pump components.
PHYSICAL PROPERTIES
|
PRINCIPLE CONSTITUENT |
Tungsten Carbide |
|
PROCESS |
HVOF: Jet Kote II |
|
WEAR RESISTANCE |
Excellent |
|
HARDNESS, Rc |
70 |
|
CHEMICAL COMPOSITION |
88 % Tungsten Carbide 12 % Cobalt |
|
THICKNESS LIMITATIONS |
0.012” plus |
|
APPLICATION RATE, lbs/hr |
8 |
|
TENSILE STRENGTH |
10,000 psi min. |
|
COEFFICIENT OF THERMAL EXPANSION, 10-6 in/in/°F |
4.2 |
|
Metallographic POROSITY, Vol. % |
<0.5 |
|
TOUGHNESS |
Excellent |
|
CORROSION RESISTANCE |
Excellent in Chlorine Service. |
|
MAX. OPERATING TEMPERATURE |
1,000 °F (540 °C) |
|
COMPARABLE SPECIFICATIONS |
LW-IIB/1NB/1N30, RAM #1, JK-112/114, WC-525, FWG 801, CFS 100 |
|
MAIN FEATURES |
Excellent sliding wear and erosion resistance |
TYPICAL APPLICATIONS
|
DRILLING TOOLS VESSELS |
VALVE SEALING SURFACES THERMOWELLS |
PUMP SHAFTS, SLEEVES IMPELLERS, PLUNGERS |
|
COMPRESSOR RODS |
CYLINDER LINERS |
BALL AND PLUG VALVES |
CORROSION RESISTANCE
|
Aluminum Sulfate |
Halides |
Hydrochloric Acid |
Sulfuric Acid |
CFS 100 is chosen primarily for its resistance to wear or the combined effects of wear and corrosion and not for corrosion alone. It is advisable to choose a substrate that is also corrosion resistant to the specific service conditions.
MAXIMUM RESISTANCE TO HIGH TEMPERATURE RESISTANCE
TO WEAR AND EROSION
Popular chrome carbide coatings can now be applied to thicknesses in excess of 0.125”. CFS 131 is composed of chrome carbide in a nickel-chrome binder. The chrome carbide particles retain their shape after being sprayed instead of going into solution. The resultant coating is hard, ductile and resistant to abrasive and sliding wear. CFS 131T may be used as a wear-resistant coating for slide valve stems, thermowells and pump components in refineries exposed to 1350°F temperatures and for severe service ball valves exposed to steam, coal liquifaction, coke, catalyst fines and a wide variety of abrasive slurries.
PHYSICAL PROPERTIES
|
PRINCIPLE CONSTITUENT |
Chrome Carbide |
|
PROCESS |
HVOF |
|
WEAR RESISTANCE |
Good to Excellent |
|
HARDNESS: Superficial Hardness: Micro |
87-89 R15n(53-57 Rc converted) 1000 - 1100 DPH300 |
|
CHEMICAL COMPOSITION |
75 % Chrome Carbide 25 % Ni-Cr |
|
SURFACE TEXTURE |
As Sprayed: 150-250 rms As Ground: 8-12 rms As Lapped: <1 rms |
|
THICKNESS LIMITATIONS |
0.125” |
|
TENSILE STRENGTH |
10,000 psi min. |
|
COEFFICIENT OF THERMAL EXPANSION, 10-6 in/in/°F |
5.6 |
|
APPLICATION TEMPERATURE |
<250 °F (120 °C) |
|
POROSITY |
<1/2 % |
|
TOUGHNESS |
Excellent |
|
CORROSION RESISTANCE |
Excellent |
|
MAX. OPERATING TEMPERATURE |
1,500 °F (760 °C) |
|
MAIN FEATURES |
Excellent erosion, impact and thermal shock resistance at both low and high temperatures. |
TYPICAL APPLICATIONS
|
VALVE STEMS |
PLUG VALVE PLUGS
|
PUMP IMPELLERS AND CASING |
|
COOLING RINGS |
COAL SHOOTS |
METERING VALVES |
|
BALL VALVES: BALL AND SEATS |
THERMOWELLS |
FCCU: SLIDE VALVE STEMS, STEM TUBES
|
The coating data provided herein was generated by skilled operators using equipment in good working condition. The information is believed to be accurate and reliable; however, thermal spray results may vary. Gulf Oro Industries is committed to a continuing program of product improvement. Product specifications are subject to change without notice. Gulf Oro Industries warrants that the coatings it generates are furnished free of defects in material and workmanship. No other warranty is expressed or implied.
