CK45 chrome plated bars combine high-strength carbon steel with a hard chromium layer, achieving exceptional surface hardness (≥850 HV) and corrosion resistance. These bars are precision-ground to tight tolerances (ISO f7) and exhibit ultra-smooth surfaces (Ra ≤0.2 μm), making them ideal for hydraulic cylinders, industrial machinery, and automotive systems where reliability under stress is critical.
Corrosion and Chemical Resilience：A dense, pore-resistant chromium coating shields the CK45 steel substrate from moisture, oxidants, and industrial chemicals. This makes the bars suitable for harsh environments, including marine equipment and chemical processing machinery.
Precision Ground for Optimal Performance：Strict adherence to ISO f7 diameter tolerances, coupled with exceptional straightness (≤0.2 mm/1000 mm) and roundness (within 50% of diameter tolerance), guarantees seamless integration into precision assemblies. The consistent geometry minimizes vibration and misalignment in dynamic systems.
Reduced Friction and Energy Consumption：The mirror-like surface finish (Ra ≤0.2 μm) lowers coefficient of friction, enabling smoother operation of moving components. This enhances efficiency in hydraulic systems and reduces power losses.
Model Variants: Solid bars, hollow piston rods, hardened shafts
Material Composition: CK45 carbon steel (equivalent to SAE 1045), with optional grades like 42CrMo4 and ST52
Standard Lengths: 3–9 meters (custom lengths up to 12 meters available)
Surface Roughness: Ra ≤0.2 μm (externally polished); achievable to ≤0.1 μm for specialized needs
Chromium Layer Thickness: 20–30 μm minimum (customizable up to 60 μm)
Surface Hardness: ≥850 HV (core hardness tailored via heat treatment)
Straightness Tolerance: ≤0.2 mm per 1000 mm length
Diameter Tolerance: ISO f7/f8 standards; optional h6/g6 for precision fits
Roundness: Within 50% of diameter tolerance
Chemical Properties: Low-carbon steel (0.42–0.50% C, 0.50–0.80% Mn) with chromium diffusion layer for oxidation resistance
Supply Conditions: hard chrome plated, induction hardened, or quenched and tempered.
Rigorous Quality Assurance
Every bar undergoes multi-stage inspections, including ultrasonic testing, adhesion checks (per ASTM B571), and dimensional verification. We comply with ISO 9001 standards and provide full material traceability with 3.1 mill certificates.
Advanced Plating Expertise
Our proprietary electrolytic plating process (adapted from crack-resistant technologies) ensures uniform chromium deposition without compromising the CK45 substrate’s mechanical properties. This results in superior bonding and resistance to delamination.
Customization Capabilities
We tailor bars to client-specific requirements:
Custom diameters (6–500 mm) and lengths (up to 12 meters)
Specialized chromium thickness (10–60 μm) and surface finishes (e.g., mirror polish)
Material certifications and RoHS compliance for environmentally sensitive markets
Global Supply Chain Efficiency
With a robust logistics network, we ensure timely delivery to North America, Europe, and Asia. Our flexible production accommodates both prototype orders and bulk quantities.
Technical Collaboration
Our metallurgy experts provide end-to-end support, from material selection to troubleshooting, ensuring optimal performance in applications like hydraulic cylinders, linear guides, and automation systems.
Hydraulic Systems: Piston rods for construction machinery (e.g., excavators) and industrial presses
Automotive Components: Shock absorber rods and steering columns
Industrial Machinery: Precision shafts for CNC equipment and robotic actuators
Agricultural Equipment: Wear-resistant parts for harvesters and tractors
Material Handling: Linear motion guides in conveyor systems
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