38MnVS6 High Tensile Chrome Bar

38MnVS6 High Tensile Chrome Bar is a micro-alloyed hydraulic steel purpose-designed for hydraulic cylinder rod applications. The 38MnVS6 grade delivers a high tensile core with the surface properties that hydraulic seals demand — hard chrome plating over a precisely ground bar, held to ISO f7 diameter tolerance throughout.

Each bar carries a minimum 20 μm hard chrome layer, applied over a ground surface. Surface roughness Ra is less than 0.2 μm — normally 0.05–0.15 μm — and Rt is always below 2.0 μm. These finishes are what keep hydraulic seals performing: a surface that is hard enough to resist wear, smooth enough not to damage the seal lip, and consistent from one end of the bar to the other. Straightness is controlled to a maximum deviation of 0.2 mm per 1.0 m, keeping bars within tolerance for direct machining or assembly.

All diameters are supplied to ISO f7 tolerance, the standard for hydraulic cylinder rod applications, ensuring fit with standard bore and seal components without additional finishing.

Available in both imperial and metric stock. FPD can supply cut-to-length or in full bar lengths — talk to our team about your requirements and we’ll confirm stock, sizing, and lead times.

Applications

• Hydraulic cylinder rods
• Linear actuators
• Agricultural, construction, and civil hydraulic equipment
• Marine and offshore hydraulic systems
• Mobile plant and heavy machinery
• Welding & Machining

38MnVS6 can be welded and machined using standard techniques. Refer to your fabrication engineer for preheat and welding procedure requirements specific to your application. The micro-alloyed composition responds consistently to machining, threading, and induction hardening where additional surface hardness is required.