ASTM B196 Copper-Beryllium Alloy Bar
- UNS No. C17000, C17200, and C17300
- Round Rod/Bar Dia. 2.4 – 50mm
- Hexagonal & Octagonal Bar Dia.: 3 – 50mm
- Square Bar Size: 5×5-38x38mm
- Rectangular Bar Size: T: 5-38mm x W: 5-65mm
Features
ASTM B196/B196M Copper-Beryllium Alloy Bar and Rod
Chemical Composition (wt.%)
| Element | C17000 (%) | C17200 (%) | C17300 (%) |
|---|---|---|---|
| Beryllium | 1.60–1.85 | 1.80–2.00 | 1.80–2.00 |
| Nickel + Cobalt (min) | 0.20 | 0.20 | 0.20 |
| Nickel + Cobalt + Iron (max) | 0.6 | 0.6 | 0.6 |
| Aluminum (max) | 0.20 | 0.20 | 0.20 |
| Silicon (max) | 0.20 | 0.20 | 0.20 |
| Lead | – | – | 0.20–0.6 |
| Copper | Remainder | Remainder | Remainder |
Mechanical Property Requirements for Solution Heat-Treated and Solution Heat-Treated and Cold-Worked
| Temper Designation | Diameter or Distance Between Parallel Surfaces | Tensile Strength (ksi) | Yield Strength (ksi, min 0.2% offset) | Rockwell Hardness (B Scale) | Elongation (%) |
| TB00 (A) | All sizes | 60–85 | 20 | 45–85 | 20 |
| TD04 (H) | Up to 3/8 in. incl. | 90–130 | 75 | 88–103 | 8 |
| Over 3/8 to 1 in. incl. | 90–125 | 75 | 88–102 | 8 | |
| Over 1 to 3 in. incl. | 85–120 | 75 | 88–101 | 8 |
Mechanical Property Requirements After Precipitation Heat-Treatment
For Copper Alloy UNS No. C17000, C17200, and C17300:
| Temper Designation | Diameter or Distance Between Parallel Surfaces | Tensile Strength (ksi) | Yield Strength (ksi, min 0.2% offset) | Rockwell Hardness (C Scale) | Elongation (%) |
| TF00 (AT) | Up to 3 in. incl. | 150–190 | 125 | 32–39 | 4 |
| TH04 (HT) | Up to 3/8 in. incl. | 170–210 | 145 | 35–41 | 4 |
| Over 3/8 to 1 in. incl. | 170–210 | 145 | 35–41 | 2 | |
| Over 1 to 3 in. incl. | 165–200 | 135 | 34–39 | 4 |
Precipitation Heat Treatment Time
For Standard Temper Designations:
| Temper | Diameter or Distance Between Parallel Surfaces | Time at 600 to 675°F (h) |
| TB00 (A) | All sizes | 3 |
| TD04 (H) | Up to 3/4 in. incl. | 2 |
| Over 3/4 in. | 3 |
Technical Specifications
| Specification | Value |
| Standard | ASTM B196 Copper-Beryllium Alloy Bar and Rod |
| Grade | UNS No. C17000, C17200, and C17300 |
| Temper | Solution heat-treated TB00 (A), and cold-drawn hard TD04 (H), which shall be precipitation heat treated after machining or forming.
Products already precipitated by heat treated by the manufacturer shall be available in tempers TF00 (AT) and TH04 (HT). |
| Type of Bars | Hot Rolled, Cold Finished |
| Shape of Bars | Round, Hexagonal and Octagonal, Square and Rectangular |
| Density | 8.9g/cm³ |
| Diameter | Round: Dia. 2.4 – 50mm; Hexagonal & Octagonal: 3 – 50mm; Square: 5-38mm; Rectangular: T: 5-38mm x W: 5-65mm |
| Length | 1000 – 6000mm |
| Inspection Certificate | EN 10204 Type 3.1 (Mill Test Certificate), EN 10204 Type 3.2 (Witness Testing or 3rd Party Inspection) |
| Tests | Chemical Analysis, Tensile Test, UT/ET |
Packing
Small diameter packed in plywood box; large diameter packed on plywood pallets.
Application
Components and Fasteners: Due to their high strength and resistance to stress relaxation, these alloys are used in critical aerospace components such as fasteners, bushings, bearings, and undercarriage parts.
Electrical Connectors: Their excellent conductivity and reliability under extreme conditions make them suitable for connectors and relays in aerospace electrical systems.
Electrical Systems: In the automotive industry, these copper-beryllium alloys are utilized for connectors, relays, and switches within the electrical system, offering durability and excellent conductivity.
Safety Devices: Components within safety systems, like airbag mechanisms and seatbelt systems, benefit from the high strength and fatigue resistance of these alloys.
Connectors and Switches: The alloys find extensive use in electronic connectors, switches, and other components where high electrical conductivity and strength are required.
Telecommunication Components: Due to their reliability and performance, these materials are also used in components for telecommunications equipment.
Mold Making and Tooling: For industrial applications requiring durable molds and tools, these alloys offer high hardness and thermal conductivity, making them ideal for high-pressure molds and welding equipment.
Bearings and Bushings: Their resistance to wear and corrosion makes them suitable for bearings and bushings in heavy machinery and industrial equipment.
Oil and Gas Components: The non-sparking properties of copper-beryllium alloys are particularly valued in the oil and gas industry for tools and components used in explosive environments.
Non-Magnetic Instruments: For environments where magnetic interference is a concern, such as around MRI machines, these alloys provide strength without magnetic interference.
Portable Electronics: The small connectors and springs in portable electronics often use copper-beryllium alloys for their excellent conductivity and reliability.
Military Hardware: These materials are used in military hardware where reliability, strength, and conductivity are critical under extreme conditions.
