Chromium Oxide Sprayed Valve Balls

Special Coating Valve balls

TongBall Chromium Oxide-Coated Valve Balls offer a high-performance solution for combined high-temperature corrosion and wear conditions. The Cr₂O₃ coating, applied via high-velocity flame or plasma spraying, delivers high hardness (HV 1100-1400), low porosity, excellent chemical corrosion resistance, and stable high-temperature performance. It effectively resists acid, alkali, and corrosive gas attack while offering strong abrasive wear resistance. Widely utilized in valves for chemical, pulp & paper, and flue gas treatment industries facing combined severe corrosion and solid particle erosion, it significantly enhances operational reliability and cost-effectiveness.

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	Cr₂O₃ (Plasma Spraying / HVOF)
Operating Temperature Range	≤800°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	HV 1100-1400
Bond Strength	≥50 MPa
Adhesion Class	Class 0 per GB/T 9286 (Cross-cut Test). No peeling is allowed.
Interface Porosity	<1.5%
Surface Roughness (Ra)	≤0.3 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