ASTM B194 C17200 Plates – Beryllium Copper (Alloy 25, CuBe2) Plate, Sheet & Strip
ASC LLP, Mumbai, supplies ASTM B194 C17200 plates, sheets and strip in beryllium copper Alloy 25 (CuBe2), in annealed, hard and age-hardened tempers. In addition, every lot comes with a mill test certificate. See also our full range of copper alloy plates.
What is ASTM B194 C17200?
ASTM B194 (ASME SB194) is the specification for copper-beryllium alloy plate, sheet, strip and rolled bar. Within it, C17200 is the high-strength alloy with about 2% beryllium, known as Alloy 25 or CuBe2. After age hardening it is the strongest copper alloy in common use, while it still keeps useful electrical conductivity.
The key to C17200 is precipitation hardening. The material is first formed or machined in a soft or cold-rolled temper; afterwards, a low-temperature heat treatment raises its strength to steel-like levels. As a result, it suits springs, connectors and wear parts that must be both strong and conductive.
C17200 Beryllium Copper – Quick Facts
- Specification: ASTM B194 / ASME SB194, UNS C17200
- Composition: 1.80–2.00% beryllium, with cobalt and nickel
- Strength: up to about 1520 MPa tensile in the HT temper
- Conductivity: 22–28% IACS, but only after age hardening
- Other names: Alloy 25, CuBe2, CW101C (2.1247)
- Special features: non-sparking and non-magnetic, as well as fatigue resistant
C17200 Chemical Composition
| Element | C17200 (%) |
| Beryllium (Be) | 1.80 – 2.00 |
| Nickel + cobalt (Ni + Co), min | 0.20 |
| Nickel + cobalt + iron (Ni + Co + Fe), max | 0.60 |
| Lead (Pb), max | 0.02 |
| Copper (Cu) | Balance |
Beryllium forms the hardening precipitates during ageing. In addition, cobalt and nickel refine the grain and slow over-ageing, which is why B194 sets a combined minimum for them rather than separate limits.
ASTM B194 Temper Designations
- TB00 (A): solution annealed, the softest temper, so it is used for severe forming.
- TD01 – TD04 (¼H to H): cold rolled after annealing; higher numbers mean more cold work.
- TF00 (AT): annealed and then age hardened by the user or mill.
- TH01 – TH04 (¼HT to HT): cold rolled and then age hardened, giving the highest strength.
- Mill-hardened (TM) tempers: also available in strip, already aged by the mill so no heat treatment is needed.
ASTM B194 C17200 Plate & Sheet Sizes
| Thickness | Typical width × length (mm) | Forms |
| 0.10 – 1.50 mm | Strip up to 610 wide, in coils or cut lengths | Strip, sheet |
| 1.50 – 6 mm | Sheet up to about 600 × 2000 | Sheet, plate |
| 6 – 50 mm | Plate and rolled bar as per mill range | Plate, bar |
Plate thickness, width and available tempers depend on the mill, so sizes are confirmed with each quotation. Furthermore, plates can be cut to size, while strip can be slit to width.
C17200 Mechanical Properties by Temper
| Temper | Tensile (MPa) | 0.2% yield (MPa) | Elongation (%) |
| TB00 (A) | 410 – 540 | 200 – 380 | 35 – 65 |
| TD02 (½H) | 580 – 690 | 510 – 660 | 12 – 30 |
| TD04 (H) | 680 – 830 | 620 – 800 | 2 – 18 |
| TF00 (AT) | 1130 – 1350 | 960 – 1210 | 3 – 15 |
| TH02 (½HT) | 1270 – 1490 | 1100 – 1350 | 1 – 8 |
| TH04 (HT) | 1310 – 1520 | 1130 – 1420 | 1 – 6 |
These are typical strip values; for thicker plate, the mill certificate gives the actual results. Note how ageing roughly doubles the strength: TB00 becomes TF00, and likewise TD04 becomes TH04.
Age Hardening C17200
- Standard treatment: 315 °C (600 °F), typically 3 hours for TB00 and 2 hours for cold-rolled tempers.
- Before ageing: form, bend or machine the part, because it is much softer at this stage.
- After ageing: strength and conductivity both rise; however, ductility falls sharply.
- Over-ageing: longer or hotter treatment lowers strength but improves conductivity and stability.
C17200 Equivalent Grades (CuBe2, 2.1247)
| Standard | Designation |
| ASTM / ASME | B194 / SB194, UNS C17200 |
| Trade name | Alloy 25, the common producer name |
| EN | CW101C (CuBe2) |
| DIN / Werkstoff | CuBe2, 2.1247 |
| Rod and bar standard | ASTM B196 for rod and bar, while B197 covers wire |
C17200 Physical Properties
| Property | Typical value |
| Density | 8.30 g/cm³ before ageing; 8.36 g/cm³ after |
| Solidus (melting start) | About 870 °C (1600 °F) |
| Electrical conductivity | 22 – 28% IACS when age hardened |
| Elastic modulus | About 128 – 131 GPa |
| Magnetic | Non-magnetic; similarly, it does not spark when struck |
C17200 vs Other Copper Alloys
Compared with phosphor bronze, C17200 is roughly twice as strong after ageing, so it is chosen for high-stress springs. By contrast, C17510 (low-beryllium) gives about 45–60% IACS but much lower strength. For high-conductivity uses where strength matters less, see our C11000 copper plates.
Applications of ASTM B194 C17200 Plates & Strip
| Industry | Typical C17200 use |
| Electronics | Connector contacts, relay springs and battery contacts |
| Oil & gas and mining | Non-sparking hand tools, as well as parts for explosive atmospheres |
| Aerospace | Bushings and bearings, especially in landing gear |
| Plastics tooling | Mould inserts and cores, because the alloy conducts heat well |
| Instruments | Diaphragms, bellows and precision springs |
Safe Handling of Beryllium Copper
Solid C17200 is safe to handle. However, inhaling fine dust, mist or fumes containing beryllium can cause serious lung disease. Therefore, grinding, welding, polishing or dry machining must be done with local exhaust ventilation and suitable controls, following the producer’s safety data sheet.
Why Buy C17200 Plates from ASC LLP?
- Traceable material: mill test certificates with chemistry, temper and mechanical results.
- Correct temper advice: help choosing TB00, TD or TH tempers, because forming and final strength decide the choice.
- Cut to size: plates cut and strip slit to width, so less machining is needed.
- Export packing: finally, material is packed to avoid surface damage in transit.
See also our C12200 copper plates, C70600 copper-nickel plates and copper alloy fasteners, as well as the full copper and copper alloys range.
Frequently Asked Questions – ASTM B194 C17200 Plates
What is ASTM B194 C17200?
In short, ASTM B194 covers copper-beryllium plate, sheet, strip and rolled bar, and C17200 is the high-strength 2% beryllium alloy (Alloy 25, CuBe2) within it.
What is the composition of C17200?
It contains 1.80–2.00% beryllium, at least 0.20% nickel plus cobalt (with Ni + Co + Fe 0.60% max), lead 0.02% max and copper as the balance.
How strong is C17200 beryllium copper?
Annealed TB00 has about 410–540 MPa tensile strength. After age hardening, however, it reaches about 1130–1350 MPa (TF00) and up to 1520 MPa (TH04).
What does TF00 or TH04 mean?
These are ASTM B194 temper codes. TF00 is solution annealed and aged, while TH04 is fully cold rolled and then aged, giving the highest strength.
How is C17200 age hardened?
Typically at 315 °C (600 °F): about 3 hours for annealed material and 2 hours for cold-rolled tempers.
What is the equivalent of C17200?
Its equivalents are CuBe2, EN CW101C and Werkstoff 2.1247. It is also widely sold as Alloy 25.
Is beryllium copper safe to use?
Solid parts are safe. Nevertheless, dust or fumes from grinding, welding or machining must be controlled, because inhaled beryllium particles are a health hazard.
Global Supply
ASC LLP supplies ASTM B194 C17200 plates, sheet and strip from Mumbai to customers in India, the Middle East, Europe, Africa, the Americas and South-East Asia. To get a prompt quotation, simply send your enquiry with thickness, size, temper and quantity.
Countries We Export To
UNITED STATES, EUROPE, UK, UAE, SAUDI ARABIA, OMAN, KUWAIT, JORDAN, QATAR, INDONESIA, MALAYSIA, BRAZIL, SPAIN, ITALY, FRANCE, GERMANY, BAHRAIN, SRI LANKA, AZERBAIJAN, AUSTRALIA, AUSTRIA, PHILIPPINES, TURKEY, RUSSIA, IRAN, IRAQ, CANADA, KOREA, JAPAN, YEMEN, FINLAND, ZIMBABWE, HUNGARY, PORTUGAL, VIETNAM, MOROCCO, THAILAND, SOUTH AFRICA, MEXICO, SINGAPORE, GREECE, KUWAIT, POLAND, NEW ZEALAND, SWEDEN, SWITZERLAND, BELGIUM, BHUTAN, BANGLADESH, TAIWAN, ROMANIA, CAMBODIA, KAZAKHSTAN, AFGHANISTAN.
