C26000 Cartridge Brass (70/30): The Cold-Workable Standard
ASTM B36 · Published: 2026-06-03 · Updated: July 2026
C26000 Cartridge Brass (70% Cu, 30% Zn) is the most ductile brass composition — it can be deep-drawn, spun, and cold-formed to extreme depths without intermediate annealing. It is the standard material for ammunition cases (hence the name),...
C26000 Cartridge Brass (70% Cu, 30% Zn) is the most ductile brass composition — it can be deep-drawn, spun, and cold-formed to extreme depths without intermediate annealing. It is the standard material for ammunition cases (hence the name), radiator cores, lamp fixtures, and plumbing fittings.
Quick Facts
| Category | Brass & Bronze |
| Standard | ASTM B36 |
| Density | 8.53 g/cm³ |
| Yield Strength | 75-420 MPa |
| Tensile Strength | 300-650 MPa |
Global Equivalents & Cross-Reference
| Alternative Standard / Grade | Action |
|---|---|
| CuZn30 | Compare |
| EN CW505L | Compare |
| JIS C2600 | Compare |
| GB H70 | Compare |
Related Comparisons
Related Materials
🧮 Material Weight Calculator
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Frequently Asked Questions
Why is it called 'cartridge brass'?
The 70/30 Cu-Zn composition was established in the 19th century for rifle and pistol cartridge cases because it combines the deep-drawing formability needed to produce the case body with sufficient strength to withstand firing pressure. It remains the standard for ammunition cases today.
References & International Standards
- ASTM International. Standard Specifications for Steel & Metal Alloys. astm.org
- International Organization for Standardization (ISO). Metallic Materials — Cross-Reference Database. iso.org
- American Iron and Steel Institute (AISI). Steel Grade Designations & Equivalents. steel.org
- European Committee for Standardization (CEN). EN Steel Standards & Numbering System. cencenelec.eu