Description
C38500, categorized as Free cutting brass, represents a notably enhanced iteration of 60/40 brass, distinguished by its exceptional free cutting characteristics. It finds application in the large-scale manufacturing of brass components demanding peak efficiency and extended tool longevity, particularly in scenarios where no additional cold forming is needed post-machining.
Chemical Composition
| Elements | Min (%) | Max (%) |
| Cu | 56.00 | 59.00 |
| Pb | 2.00 | 3.50 |
| Total Others | – | 0.75 |
| Zn | Remainder |
Mechanical Properties According To ASTM B455 (As Per Temper HO2)
| Range |
From |
To |
UTS Min (Kg/mm²) |
PS Min |
Elongation Min (%) |
Hardness Min |
Hardness Max |
| Round (Dia) |
1.5 |
75 |
39 |
– |
12 |
– |
– |
| Hex (A/F) |
3 |
70 |
39 |
– |
12 |
– |
– |
| Square (A/F) |
3 |
60 |
39 |
– |
12 |
– |
– |
| Rectangle (Thickness) |
3 |
50 |
39 |
– |
12 |
– |
– |
| PHYSICAL PROPERTIES |
| Melting Point – Liquidus°F |
1630 |
| Melting Point – Solidus°F |
1610 |
| Densitylb/cu in. at 68°F |
0.306 |
| Specific Gravity |
8.47 |
| Electrical Conductivity% IACS at 68°F |
28 |
| Thermal ConductivityBtu/ sq ft/ ft hr/ °F at 68°F |
71 |
| Coefficient of Thermal Expansion 68-57210⁻⁶ per °F (68 – 572°F) |
11.6 |
| Specific Heat CapacityBtu/ lb /°F at 68°F |
0.09 |
| Modulus of Elasticity in Tensionksi |
14000 |
| Modulus of Rigidityksi |
5300 |
| 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 |
Poor |
| Capacity for Being Hot Formed |
Excellent |
| Machinability Rating |
90 |
