UNS C27400 yellow brass has a copper content of not less than 62%, CuZn37 is the major brass alloy for the cold forming process. Even though brasses with lower Zinc content have better cold forming properties, CuZn37 is the most used alloy. Reasons for this are on the one hand economical due to lower price of Zinc compared to copper on the other hand the forming properties of this alloy meet the demand of many applications.
CHEMICAL COMPOSITION
| Elements | Min (%) | Max (%) |
|---|---|---|
| Cu | 61 | 64 |
| Pb | - | 0.10 |
| Fe | - | 0.05 |
| Total Others | - | 0.30 |
| Zn | Remainder | |
Mechanical Properties According To ASTM B927 (As Per Temper HO2)
| Range (inch) | From | To | UTS Min (ksi) | UTS Max (ksi) | PS Min (ksi) | Elongation Min (%) | Hardness Min (HRB) | Hardness Max (HRB) | |
|---|---|---|---|---|---|---|---|---|---|
| Round (Dia) | 0.059 | 0.500 | 53 | - | 33 | 10 | - | - | |
| 0.500 | 1.000 | 48 | - | 30 | 13 | - | - | ||
| 1.000 | 2.953 | 43 | - | 28 | 15 | - | - | ||
| Hex (A/F) | 0.118 | 0.500 | 53 | - | 33 | 10 | - | - | |
| 0.500 | 1.000 | 48 | - | 30 | 13 | - | - | ||
| 1.000 | 2.756 | 43 | - | 28 | 15 | - | - | ||
| Square (A/F) | 0.118 | 0.500 | 53 | - | 33 | 10 | - | - | |
| 0.500 | 1.000 | 48 | - | 30 | 13 | - | - | ||
| 1.000 | 2.756 | 43 | - | 28 | 15 | - | - | ||
| Rectangle | Thickness | 0.118 | 0.500 | 53 | - | 33 | 10 | - | - |
| Thickness | 0.500 | 1.000 | 48 | - | 30 | 13 | - | - | |
| Thickness | 1.000 | 1.969 | 43 | - | 28 | 15 | - | - | |
| Range (mm) | From | To | UTS Min (MPa) | UTS Max (MPa) | PS Min (MPa) | Elongation Min (%) | Hardness Min (HRB) | Hardness Max (HRB) | |
|---|---|---|---|---|---|---|---|---|---|
| Round (Dia) | 1.5 | 12 | 365 | - | 230 | 10 | - | - | |
| 12 | 25 | 330 | - | 205 | 13 | - | - | ||
| 25 | 75 | 295 | - | 195 | 15 | - | - | ||
| Hex (A/F) | 3 | 12 | 365 | - | 230 | 10 | - | - | |
| 12 | 25 | 330 | - | 205 | 13 | - | - | ||
| 25 | 70 | 295 | - | 195 | 15 | - | - | ||
| Square (A/F) | 3 | 12 | 345 | - | 170 | 10 | - | - | |
| 12 | 25 | 310 | - | 115 | 20 | - | - | ||
| 25 | 50 | 275 | - | 105 | 20 | - | - | ||
| Rectangle | Thickness | 3 | 12 | 345 | - | 170 | 10 | - | - |
| Thickness | 12 | 25 | 310 | - | 115 | 20 | - | - | |
| Thickness | 25 | 50 | 275 | - | 105 | 20 | - | - | |
PHYSICAL PROPERTIES
| Melting Point - Liquidus °F | 1680 |
| Density lb/cu in at 68°F | 0.31 |
| Specific Gravity | 8.44 |
| Electrical Conductivity %IACS at 68°F | 27 |
| Thermal Conductivity BTU/ sq ft/ ft hr/ °F at 68°F | 67 |
| Coefficient of Thermal Expansion 68-572 10⁻⁶ per °F (68 – 572°F) | 11.4 |
| Specific Heat BTU/ lb /°F at 68°F | 0.09 |
| Modulus of Elasticity in Tension ksi | 15000 |
| Modulus of Rigidity ksi | 5600 |
FABRICATION PROPERTIES
| Technique | Suitability |
|---|---|
| Soldering | Excellent |
| Brazing | Excellent |
| Oxyacetylene Welding | Good |
| Gas Shielded Arc Welding | Fair |
| Coated Metal Arc Welding | Not Recommended |
| Spot Weld | Good |
| Seam Weld | Not Recommended |
| Butt Weld | Good |
| Capacity for Being Cold Worked | Excellent |
| Capacity for Being Hot Formed | Fair |
| Machinability Rating | 35 |
Typical Uses for C27400
Industrial: Cold Headed Parts
Plumbing: Plumbing Accessories, Traps, Plumbing Trap Tube
Our product range
| Category | Product Name | Standard Specifications | Typical Forms | Common Applications |
|---|---|---|---|---|
| Copper Tubes | Copper & Copper Alloy Tubes | ASTM B68, B75, B88, B280, B306, EN 12449, 12451, JIS H3300 | Straight lengths, coils, U-bends | HVACR, plumbing, heat exchangers, refrigeration, industrial pipelines |
| Copper Rods | Copper & Copper Alloy Rods | ASTM B187, B301, B441, EN 12163, 12164, JIS H3250 | Round, hexagonal, square, rectangular | Electrical components, fasteners, machined parts, connectors |
| Copper Plates/Sheets | Copper & Copper Alloy Plates/Sheets | ASTM B152, B248M, EN 1652, JIS H3100, H3110 | Plates, sheets, coils | Architectural cladding, roofing, chemical tanks, electrical shielding, fabrication |
| Copper Wires | Copper & Copper Alloy Wires | ASTM B1, B3, B258, EN 13601, 13602, IEC 60228 | Bare, tinned, stranded, single-end | Electrical wiring, cables, windings, conductors, wire mesh |
| Copper Strips/Bands | Copper & Copper Alloy Strips | ASTM B103, B122, B534, EN 1654, JIS H3110, H3260 | Coils, slit strips, narrow width | Busbars, connectors, terminals, transformers, electronic components |
| Other Copper Products | Custom Profiles & Special Shapes | Custom specifications, drawings accepted | Extruded, drawn, rolled | Custom engineering, automotive, aerospace, specialty industrial uses |
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Copper Packaging
Our copper products all employ professional graded packaging to ensure transportation safety and product integrity: Copper tubes and rods are tightly wrapped with moisture-proof stretch film and secured on reinforced wooden pallets, with extra corner protectors for extra-long tubes; Copper plates, strips, and wire coils are lined with waterproof paper or plastic film, fixed externally with sturdy wooden crates or steel-strapped solid wooden pallets, and include VCI (Volatile Corrosion Inhibitor) paper inside to prevent corrosion. All packages are clearly marked with product information, lifting symbols, and moisture/impact warnings, and can be customized according to client requirements to ensure safe delivery to destinations worldwide.
