The CK45 Chrome Hollow Bar combines high-strength engineering, advanced corrosion resistance, and precision manufacturing to deliver unmatched performance in critical industrial applications. Its adherence to international standards, rigorous quality control, and versatility make it a trusted solution for engineers and industries demanding reliability under harsh operating conditions.
Material Composition (CK45)
Element Percentage (%)
Carbon (C)： 0.42 – 0.50
Chromium (Cr) ：0.50 – 1.00
Manganese (Mn)： 0.60 – 0.90
Silicon (Si)： ≤ 0.35
Sulfur (S) ：≤ 0.050
Phosphorus (P)： ≤ 0.045
Parameter Value/Specification Of CK45 Chrome Hollow Bar
Material Grade CK45 (ASTM A108 / DIN 1.0503) – Medium carbon steel with 0.42–0.50% carbon content.
Outer Diameter (OD): Customizable (Range: 10 mm – 150 mm)
Inner Diameter (ID): Precision-machined to match OD (Tolerance: ±0.05 mm).
Wall Thickness Standard: 2–10 mm (Customizable per request)
Surface Coating Electroplated or spray-coated chromium: (Thickness: 50–200 μm, hardness: HV 800–1000).
Tensile Strength: ≥ 600 MPa
Yield Strength: ≥ 450 MPa
Hardness Core: HB 220–250
Surface: HRC 55–60 (Rockwell scale)
Corrosion Resistance Resists rust and oxidation up to 80°C in humid or chemically aggressive environments
Key Technical Features Of CK45 Chrome Hollow Bar
1.High Chrome Coating for Durability
Electroplated or thermal-sprayed chromium layer enhances wear resistance, reduces friction, and extends service life.
Surface activation ensures excellent adhesion and uniform coating distribution.
2. Precision Machining
CNC-turned or precision-ground to tight tolerances (ISO 2768 Class 1) for seamless integration into mechanical systems.
Guaranteed concentricity and circularity (ISO 2768 / DIN 2501 standards).
3. Optimized Mechanical Properties
CK45 steel provides a balance of strength, toughness, and machinability after quenching and tempering (Q&T) treatment.
Excellent fatigue resistance under cyclic loading.
4. Lightweight Design
Hollow structure reduces weight by up to 40% compared to solid bars while maintaining structural integrity.
5. Versatile Compatibility
Compatible with hydraulic fluids, lubricants, and chemicals commonly used in industrial machinery.
6. Quality Assurance
100% non-destructive testing (NDT): Magnetic particle inspection (MPI), ultrasonic testing (UT), and dye penetrant testing (DPT).
Material certificates (EN 10204 3.1) and third-party lab reports available.
The CK45 Chrome Hollow Bar is critical in industries where performance, precision, and longevity are non-negotiable:
Hydraulic & Pneumatic Systems: Cylinders shaft, pistons, and valves requiring leak-proof operation.
Automotive: Axle shafts, gearboxes, and suspension components.
Agricultural Machinery: Heavy-duty rotating shafts and hydraulic arms.
Industrial Valves & Pumps: High-pressure manifolds and sealing components.
Renewable Energy: Wind turbine yaw and pitch systems.
Aerospace & Defense: Lightweight, high-strength structural elements.
