303Cu Stainless Steel Rod High-Performance Alloy with Copper Addition Diameter 4 - 70mm Bright Bar

Products Specification

303Cu Stainless Steel Rod High-Performance Alloy with Copper Addition Diameter 4–70mm Bright Bar

The 303Cu stainless steel rod is a high-performance, free-machining austenitic stainless steel grade developed by enhancing the traditional 303 composition with copper (Cu) addition. The presence of copper significantly improves machinability, chip breaking, surface finish, and cold-forming behavior, making 303Cu a preferred choice for precision components, high-speed machining, and complex geometries. Available in diameters from 4 mm to 70 mm, our Bright Bar finish ensures superior dimensional accuracy, excellent surface quality, and enhanced corrosion resistance.

This product description provides a comprehensive overview of material properties, chemical composition, mechanical characteristics, applications, benefits, and dimensional options. The structure and content follow Google-friendly SEO rules to support search visibility while offering professional-grade technical details.

1. Product Overview

The 303Cu Stainless Steel Rod is specially engineered for environments where high machinability and reliable corrosion resistance are essential. The copper-alloyed modification of standard 303 improves chip control during turning, drilling, milling, and CNC automatic lathe operations. This helps manufacturers achieve higher production efficiency, lower tool wear, and finer surface accuracy.

Our rods feature a bright-drawn or centerless-ground surface, ensuring tight tolerances and consistency across all supplied diameters. These rods are widely used in automotive parts, fasteners, home appliance components, valves, fittings, hardware accessories, and electromechanical equipment.

2. Key Features and Advantages

✔ Superior Machinability

The copper addition drastically increases material lubricity and chip breakability, making 303Cu suitable for high-speed cutting and continuous machining with reduced tool wear.

✔ Good Corrosion Resistance

Based on the 18-8 stainless steel family, 303Cu retains excellent resistance to atmospheric corrosion, mild chemicals, and daily industrial environments.

✔ Excellent Surface Finish

Bright bars exhibit high reflectivity and smooth surfaces, which are especially important for decorative or precision components.

✔ Stable Mechanical Properties

With a dependable balance of strength, hardness, and ductility, 303Cu rods perform well in mechanical operations such as drilling, threading, and shaping.

✔ Non-magnetic in Annealed Condition

303Cu maintains non-magnetic characteristics, suitable for applications requiring low magnetic permeability.

3. Chemical Composition (Typical Values)

The following table shows the standard chemical composition of 303Cu stainless steel:

Copper, along with increased sulfur content, enhances machinability significantly compared to standard 304 or 303 stainless steel grades.

4. Mechanical Properties

Mechanical characteristics may vary depending on size, heat treatment, and finishing method. Typical properties for cold-drawn 303Cu stainless steel rod are listed below:

These mechanical values highlight the alloy’s strong balance between strength and ductility, enabling excellent formability and performance under machining stress.

5. Available Diameter Range: 4–70 mm

We supply 303Cu stainless steel rods in a broad range of diameters to accommodate machining and structural needs. The standard diameter range includes:

• 4 mm

• 6 mm

• 8 mm

• 10 mm

• 12 mm

• 14 mm

• 16 mm

• 18 mm

• 20 mm

• 25 mm

• 30 mm

• 35 mm

• 40 mm

• 45 mm

• 50 mm

• 60 mm

• 70 mm

Custom sizes outside this range may also be available upon request.

6. Dimensional and Tolerance Specifications

To ensure stability in precision machining, each rod undergoes careful dimensional control. The following table summarizes standard tolerances for bright bars:

These values may vary by order specification and production standards.

7. Manufacturing Process

303Cu stainless steel rods undergo a precise production sequence designed to ensure optimal machinability, surface quality, and mechanical reliability.

Process Flow:

1. Melting & Alloying – Chromium, nickel, and copper precisely controlled.

2. Hot Rolling – Ensures structural homogeneity and initial shaping.

3. Cold Drawing or Peeling – Achieves tighter tolerances and improved surface condition.

4. Bright Finishing / Centerless Grinding – Produces mirror-like brightness.

5. Straightening – Guarantees consistent straightness along the entire length.

6. Cutting & Packaging – Custom lengths available (e.g., 1 m, 2 m, 3 m, 6 m).

This refined process delivers rods suitable for high-speed CNC machining and automatic lathes.

8. Applications of 303Cu Stainless Steel Rod

The enhanced machinability and stable mechanical performance make 303Cu ideal for components requiring precision, repeatability, and tight tolerances. Common applications include:

Industrial & Mechanical Components

• Shafts and gear parts

• Bushings and spacers

• Precision turned parts

• Connector bodies

Automotive and Transportation

• Fuel system fittings

• Sensor housings

• Fasteners and screws

Hardware & Consumer Products

• Door handles

• Decorative hardware

• Kitchen equipment components

Fluid & Pneumatic Systems

• Valve stems

• Couplings

• Hydraulic fittings

Electrical & Electronics

• Connectors

• Terminals

• Non-magnetic components

303Cu is especially valued in industries requiring high-speed machining, such as CNC automation, robotics, micro-machining, and electronic hardware.

9. Benefits of Copper-Alloyed 303 vs Standard 303 Stainless Steel

Copper addition is the key factor that makes 303Cu one of the highest-performance free-machining stainless steels available.

10. Product Packaging and Supply Options

To meet diverse industrial requirements, we offer a variety of packaging and shipping solutions:

• Bundles with steel straps

• Plastic-wrapped rods for corrosion protection

• Wooden cases for export and long-distance transport

• Customized lengths cut according to customer needs

All products are visually inspected and dimensionally verified before shipment.

11. Quality Assurance

Our 303Cu stainless steel rods are produced under strict quality control standards, ensuring:

• Chemical composition accuracy

• Dimensional tolerance compliance

• Smooth and defect-free bright finishes

• Ultrasonic inspection on request

• Mechanical testing certificates (EN 10204 3.1 or 3.2)

We maintain consistent quality suitable for global industrial markets.

12. Why Choose Our 303Cu Stainless Steel Rods?

✓ Precision Manufacturing

High-accuracy bright bars designed for precision machining.

✓ Reliable Supplier Capacity

Stable production capability for both large-scale and custom orders.

✓ Excellent Consistency

Uniform mechanical properties across different batches.

✓ Competitive Pricing

Optimized production processes allow cost-effective solutions.

✓ Full Technical Support

We provide material certificates, data sheets, and application recommendations.

13. Technical Specifications Summary

14. Conclusion

The 303Cu Stainless Steel Rod High-Performance Alloy with Copper Addition Diameter 4–70 mm Bright Bar provides an ideal combination of superior machinability, stable mechanical performance, corrosion resistance, and high-quality surface finishing. With copper-enhanced machinability and available bright-drawn accuracy, this material is a top choice for industries requiring reliable and efficient fabrication.