Tungsten Carbide-coated Valve Balls

tungsten carbide-coated valve balls, produced via HVOF (High-Velocity Oxygen Fuel) spraying, set the standard for wear resistance in extreme abrasion environments. The WC-Co or WC-Co-Cr coating exhibits high bond strength, porosity below 1%, and microhardness exceeding HV1300. Designed specifically for media such as coal slurry, mineral slurry, and heavy residual oil, these balls deliver unparalleled protection under intense erosive conditions, extending replacement intervals by 3–5 times and significantly reducing maintenance costs.

PDF download Online Inqury BALLKING VALVE BALL TESTING REPORTS Ballking Sphere English Catalog

Detail

Size Range	1/2" to 56" (Custom sizes available)
Pressure Rating	PN10-PN420 （Class150-4500）
Ball Material	F304, 1.4301, F316,1.4401, A105, F51/53/F55/F60/F44, 17-4PH, Inconel 625/718/825, Monel 400/500,K-500 etc.
Core Process/Coating	Cr₃C₂-NiCr (HVOF/HVAF)
Operating Temperature Range	≤540°C
Core Technical Parameters	Criteria for High-End Technical Level
Thickness Uniformity	Thickness deviation at any spherical position ≤±8%
Thickness Tolerance Range	100 - 500 μm. For ultra-thin coatings (<10 μm) Zero missed-spray allowed
Surface Hardness	HRC 70-75
Bond Strength	≥70 MPa
Adhesion Class	Class 0 per GB/T 9286 (Cross-cut Test). No peeling is allowed.
Interface Porosity	<1%
Surface Roughness (Ra)	≤0.8 µm
Surface Defect Rate	≤0.1 defects per m² ; no cracks or bubbles
Spraying Positioning Accuracy	±0.1mm
Edge Coverage	No edge warping or shrinkage 100% coverage