Wednesday, June 25, 2008 - 10:00 AM
New York (Capital Hilton)
51

Elimination of Hexavalent Chromium Used in Hydraulic & Pneumatic Tubing

Robert R. Rick, Commercial Fluid Power, La Porte, IN

Commercial Fluid Power in conjunction with MACSTEEL NitroSteel Division has developed a tubing product that replaces Chrome Plated Interior Diameter (CPID) tubing and Chrome Plated Outside Diameter (CPOD) tubing used in the manufacturing of hydraulic and pneumatic cylinders. Precision machined tubing products are Ferritic Nitro-Carburized (FNC) and oxidized giving the surface a hard chrome like wear surface, good lubricity, a low co-efficient of friction and better corrosion resistance than standard CPID and CPOD products. The primary focus on this technology development has been to eliminate hexavalent chrome, a toxic, carcinogenic substance that is created in the production and disposal of CPID and CPOD tubing. The Ferritic Nitro-Carburizing and Oxidizing of these precision machined parts waste product is water. This Nitriding and Oxidizing process's impact on the environment is very minimal compared to the waste products generated by industrial hard chrome plating with the current technology that exists today. This product, as developed, is a direct replacement material for Chrome Plated OD and ID tubes. There is no hazardous by products produced in the manufacturing of Nitro-tuff tubes or in the disposal of this product after it has served its useful life. Nitro-tuff Pneumatic Cylinder Base: Material St52.3 SRA DOM Produced to ASTM A513 Type 5 Nitro-tuff Hydraulic Cylinder Base: Material 4130 Q&T 28/32 HRC with a 100% Martensitic Grain structure Surface Thickness: 0.001” minimum thickness per side. Diffusion Zone: Hardened diffusion zone, beneath the wear layer, has a hardness gradient from low 50's Rc to = 40 Rc at 0.015" depth. Surface Finish: 16 Ra Maximum Corrosion Resistance: 150 Hours in a Neutral Salt Spray Bath with a Rating 10. Tested and rated per ASTM B117 & B537 In summary Nitro-tuff tubes are an eco friendly, cost effective replacement for CPOD and CPID tubing.



Web Page: www.CommercialFluidPower.com