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IS:319 Grade-1
IS:319 Grade-2
IS 319 Grade 2 is the most widely utilized free-cutting brass alloy under the Bureau of Indian Standards (BIS). Engineered specifically for high-efficiency repetitive machining, automatic screw machines, and high-speed CNC lathes, it provides an optimal balance between excellent machinability and structural integrity. With a higher controlled lead content ($2.0\% - 3.0\%$) compared to Grade 1, it allows faster cutting speeds, smaller chip formation, and superior surface finishes while maintaining good mechanical strength.
Chemical Composition
Elements | Min (%) | Max (%) |
Cu | 60.00 | 63.00 |
Pb | 2.50 | 3.70 |
Fe | – | 0.35 |
Total Others | – | 0.50 |
Zn | Remainder | |
Mechanical Properties According To IS 319 GR LL (As Per Temper HB)
Range (mm) |
From |
To |
UTS Min (MPa) |
PS Min |
Elongation Min (%) |
Hardness Min (HV) |
Hardness Max (HV) |
|
| Round (Dia) | 6 |
12 |
395 |
– |
7 |
120 |
150 |
|
12 |
25 |
385 |
– |
10 |
115 |
145 |
||
25 |
50 |
345 |
– |
15 |
100 |
130 |
||
50 |
75 |
315 |
– |
20 |
90 |
120 |
||
| Hex (A/F) | 6 |
12 |
395 |
– |
7 |
120 |
150 |
|
12 |
25 |
385 |
– |
10 |
115 |
145 |
||
25 |
50 |
345 |
– |
15 |
100 |
130 |
||
50 |
70 |
315 |
– |
20 |
90 |
120 |
||
| Square (A/F) | 6 |
12 |
395 |
– |
7 |
120 |
150 |
|
12 |
25 |
385 |
– |
10 |
115 |
145 |
||
25 |
50 |
345 |
– |
15 |
100 |
130 |
||
50 |
60 |
315 |
– |
20 |
90 |
120 |
||
| Rectangle (Thickness) | 6 |
12 |
395 |
– |
7 |
120 |
150 |
|
12 |
25 |
385 |
– |
10 |
115 |
145 |
||
25 |
50 |
345 |
– |
12 |
100 |
130 |
||
PHYSICAL PROPERTIES |
|
| Melting Point – Liquidus°F | 1650 |
| Melting Point – Solidus°F | 1630 |
| Densitylb/cu in. at 68°F | 0.307 |
| Specific Gravity | 8.5 |
| Electrical Conductivity% IACS at 68°F | 26 |
| Thermal ConductivityBtu/ sq ft/ ft hr/ °F at 68°F | 67 |
| Coefficient of Thermal Expansion 68-57210⁻⁶ per °F (68 – 572°F) | 11.4 |
| 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 | Fair |
| Capacity for Being Hot Formed | Fair |
| Machinability Rating | 100 |
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