Cast C31400
C31400, or leaded commercial bronze, is a free machining brass with excellent electrical and thermal conductivity. Alloy C314 is resistant to corrosion and contains approximately 2% lead to impart free-cutting characteristics.
Information
PRODUCT DESCRIPTION: Leaded Commercial Bronze
TEMPERS: H02 Half Hard, H04 Hard
SOLIDS: 3/8” to 2” O.D.
HEX: 3/8" to 2" O.D.
RECTANGLES: Consult Mill
STANDARD LENGTHS: 144”
Typical Uses
BUILDERS HARDWARE: door knobs
ELECTRICAL: connectors for wire and cable, electrical plug-type connectors
FASTENERS: nuts, screws
INDUSTRIAL: pickling crates, pickling fixtures, pickling racks, screw machine parts
Similar or Equivalent Specification
| CDA | ASTM | SAE | AMS | Federal | Military | Other |
|---|---|---|---|---|---|---|
| C31400 | B140 B140M | MIL-V-18436 |
Chemical Composition
| Cu% | Pb% | Zn% | Fe% | Ni% |
|---|---|---|---|---|
| 87.50-90.50 | 1.30-2.50 | Rem. | 0.10 | 0.70 |
Chemical Composition according to ASTM B140/B140M-12(2017)
Note: Cu + Sum of Named Elements, 99.5% min. Single values represent maximums.
Machinability
| Copper Alloy UNS No. | Machinability Rating | Density (lb / in³ at 68 °F) |
|---|---|---|
| C31400 | 80 | 0.319 |
Mechanical Properties
Mechanical Properties according to ASTM B140/B140M-12(2017), H02 Half Hard
Size Range: 1/2" Diameter and Under
| Tensile Strength, min | Yield Strength, at 0.5% Extension Under Load, min | Elongation, in 2 in. or 50 mm min | Rockwell "B" Hardness | Remarks | ||
|---|---|---|---|---|---|---|
| ksi | MPa | ksi | MPa | % | typical HRB | |
| 50 | 345 | 30 | 205 | 7 | 61 | |
Size Range: Over 1/2" Diameter to 1" Inclusive
| Tensile Strength, min | Yield Strength, at 0.5% Extension Under Load, min | Elongation, in 2 in. or 50 mm min | Rockwell "B" Hardness | Remarks | ||
|---|---|---|---|---|---|---|
| ksi | MPa | ksi | MPa | % | typical HRB | |
| 50 | 345 | 30 | 205 | 7 | 61 | |
Size Range: Over 1" Diameter
| Tensile Strength, min | Yield Strength, at 0.5% Extension Under Load, min | Elongation, in 2 in. or 50 mm min | Rockwell "B" Hardness | Remarks | ||
|---|---|---|---|---|---|---|
| ksi | MPa | ksi | MPa | % | typical HRB | |
| 40 | 275 | 25 | 170 | 12 | 58 | |
H04 Hard
Size Range: 2" Diameter and Under
| Tensile Strength, min | Yield Strength, at 0.5% Extension Under Load, min | Elongation, in 2 in. or 50 mm min | Rockwell "B" Hardness | Remarks | ||
|---|---|---|---|---|---|---|
| ksi | MPa | ksi | MPa | % | typical HRB | |
| 53 | 365 | 40 | 275 | 6 | 65 | |
Physical Properties
| US Customary | Metric | |
|---|---|---|
| Melting Point - Liquidus | 1900 °F | 1038 °C |
| Melting Point - Solidus | 1850 °F | 1010 °C |
| Density | 0.319 lb/in³ at 68 °F | 8.83 gm/cm³ at 20 °C |
| Specific Gravity | 8.83 | 8.83 |
| Electrical Conductivity | 42% IACS at 68 °F | 0.246 MegaSiemens/cm at 20 °C |
| Thermal Conductivity | 104 Btu/sq ft/ft hr/°F at 68 °F | 180 W/m at 20 °C |
| Coefficient of Thermal Expansion 68-572 | 10.6 · 10-6 per °F (68-572 °F) | 17.6 · 10-6 per °C (20-300 °C) |
| Specific Heat Capacity | 0.09 Btu/lb/°F at 68 °F | 377.1 J/kg at 20 °C |
| Modulus of Elastic in Tension | 17000 ksi | 117212 MPa |
| Modulus of Rigidity | 6400 ksi | 44127 MPa |
Fabrication Properties
| Technique | Suitability |
|---|---|
| Soldering | Excellent |
| Brazing | Good |
| Oxyacetylene Welding | Not Recommended |
| Gas Shielded Arc Welding | Not Recommended |
| Coated Metal Arc Welding | Not Recommended |
| Spot Weld | Not Recommended |
| Seam Weld | Not Recommended |
| Butt Weld | Fair |
| Capacity for Being Cold Worked | Good |
| Capacity for Being Hot Formed | Poor |
| Machinability Rating | 80 |
Thermal Properties
| Treatment | Minimum * | Maximum * |
|---|---|---|
| Annealing | 800 | 1200 |