C26000 – 70/30 BRASS
COMPOSITION
|
|||
| ELEMENT | PERCENT | ||
|---|---|---|---|
| NOMINAL | MINIMUM | MAXIMUM | |
| Copper | 70 | 68.5 | 71.5 |
| Lead | - | - | .07 |
| Iron | - | - | .06 |
| Zinc | 30 | Remainder | |
| Total other elements | - | - | - |
PHYSICAL PROPERTIES
| HEAT TREATED CONDITION | ENGLISH UNITS | METRIC UNITS |
|---|---|---|
| Melting Range | 1680-1750°F | 915-955°C |
| Density | .308 lb/cu in. @ 68°F | 8.53 gm/cm@ 20°C |
| Specific Gravity | 8.53 | 8.53 |
| Coefficient of Thermal Expansion |
.0000111 per °F (68-392°F) | .0000199 per °C (20-200°C) |
| Thermal Conductivity | 70 BTU/sq ft/ft/hr/°F @ 68°F | .29 cal/sq cm/cm/sec/°C @ 20°C |
| Electrical Resistivity (Annealed) |
37.0 Ohms/circ mil ft @ 68°F | 6.16 microhm – cm @ 20°C |
| Electrical Conductivity (Annealed) |
28% Copper IACS @ 68°F | .162 megohm cm @ 20°C |
| Specific Heat | .09 BTU/lb/°F @ 68°F | .09 cal/gm/°C @ 20°C |
| Modulus of Elasticity (tension) |
16,000 KSI* | 11,200 kg/sq mm |
| Modulus of Rigidity (torsion) | 6000 KSI | 4200 kg/sq mm |
| Annealing Temperature | 800-1400°F | 425-750°C |
| Stress Relief Temperature (1 hr) |
500°F | 260°C |
MECHANICAL PROPERTIES
MECHANICAL PROPERTIES
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| For Round, Half Round and Square Wire | |||||
| DESIGNATION | TENSILE STRENGTH | YIELD STRENGTH † .5% EXTENSION NOMINAL |
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|---|---|---|---|---|---|
| STD | FORMER | KSI* | MPa** | KSI* | MPa** |
| - | Annealed (A) | 48-54 †† | 330-372 †† | 16-23 | 110-158 |
| H00 | Eighth Hard | 50-55 | 345-450 | 46 | 317 |
| H01 | Quarter Hard (1/4H) | 62-77 | 425-530 | 57 | 393 |
| HO2 | Half Hard (1/2H) | 79-94 | 545-650 | 65 | 448 |
| HO3 | Three Quarters Hard (3/4H) | 92-107 | 635-740 | 70 | 482 |
| HO4 | Hard | 102-117 | 700-810 | 70 | 482 |
| H06 | Extra Hard (XH) | 115-129 | 790-890 | 70 | 482 |
| H08 | Spring | 120 min | 830 min | 70 | 482 |
MECHANICAL PROPERTIES
| DESIGNATION | TENSILE STRENGTH | YIELD STRENGTH † .5% EXTENSION NOMINAL |
PERCENT ELONGATION † IN 2 in., IN 50 mm NOMINAL |
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|---|---|---|---|---|---|---|
| STD | FORMER | KSI* | MPa** | KSI* | MPa** | |
| - | Annealed (A) | 44-53†† | 303-365†† | 11-22 | 75-151 | 54-66 |
|
H01 |
Quarter Hard (1/4H) | 49-59 | 340-405 | 40 | 275 | 43 |
| H02 | Half Hard (1/2H) | 57-67 | 395-460 | 52 | 358 | 23 |
| H03 | Three Quarters Hard | 64-74 | 440-510 | 57 | 393 | 10 |
| H04 | Hard (H) | 71-81 | 490-560 | 63 | 434 | 8 |
| H06 | Extra Hard (XH) | 83-92 | 570-635 | 65 | 448 | 5 |
| H08 | Spring | 91-100 | 625-690 | 65 | 448 | 3 |
| H10 | Extra Spring | 95-104 | 655-720 | 65 | 448 | 3 |
What is the difference between C260 and C360 brass?
This is a comparison between two fundamentally different brass alloys:
C26000 (Cartridge Brass): A binary alloy of Cu (~70%) and Zn (~30%). It has excellent cold-forming properties (deep drawing, bending) but only fair machinability (rated ~20% of a free-machining brass).
C36000 (Free-Cutting Brass): A leaded brass containing Cu (~61%), Zn (~35%), and Pb (~3%). The added lead improves machinability dramatically (rated at 100%, the industry standard). However, this comes at the cost of significantly poorer cold workability (it cracks if severely bent or stamped) and lower ductility.
Choice: Use C26000 for formed parts. Use C36000 for parts that require extensive drilling, turning, or milling.
Our factory
Our factory specializes in the production and manufacturing of high-quality copper products. We operate a comprehensive, end-to-end production line equipped with advanced continuous casting and rolling mills, precision drawing machines, high-speed rolling mills, and automated heat treatment systems. We professionally produce a wide range of copper tubes, plates, bars, wires, and foils. A strict quality inspection system is implemented throughout the entire process, from raw material intake to finished product delivery. Supported by precision instruments such as spectrometers, metallographic microscopes, tensile testing machines, eddy current flaw detectors, and laser dimension gauges, we ensure that our products fully comply with international and domestic standards-including ASTM, EN, JIS, and GB-in terms of chemical composition, mechanical properties, dimensional accuracy, and surface quality. We are committed to providing global customers with stable, reliable, and fully-specified copper material solutions.
copper product packaging
Our products are packaged using professional, customized industrial packaging solutions to ensure they remain intact during long-distance transportation and multiple handlings. For long products such as copper tubes and bars, we use sturdy waterproof wooden crates or metal-frame boxes for secure fixing and protection. Copper plates and foils are individually wrapped with anti-rust paper, then packed into steel-edged boxes or on pallets with reinforced hard corners. Copper wires are wound with moisture-proof film and neatly coiled onto custom-designed reels or placed in wooden cases. All packaging is clearly marked according to customer requirements with shipping marks, specifications, batch numbers, and handling symbols. Desiccants can also be placed inside the packages when needed, providing complete protection against rust, moisture, and impact throughout the entire journey from production to the destination port.
