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IS:6912 FLB
IS:6912 FLB
IS 6912 FLB (standardized under Bureau of Indian Standards specification IS 6912: Copper and Copper Alloy Forging Stock and Forgings) designates Forging Leaded Brass. Formulated as an (α + β) duplex brass matrix with approximately 57.0% to 60.0% copper and a controlled 1.5% to 2.5% lead (Pb) addition, FLB is engineered for components that require hot drop forging or closed-die hot stamping followed by intensive, high-speed secondary CNC machining. The balanced lead distribution ensures short, discontinuous chip formation during drilling, facing, and thread cutting without inducing hot shortness or tearing inside heated forging dies.
Chemical Composition
Elements | Min (%) | Max (%) |
Cu | 56.50 | 60.00 |
Pb | 0.60 | 2.00 |
Fe | – | 0.30 |
Total Others Excl Fe | – | 0.75 |
Zn | Remainder | |
Mechanical Properties According To 6912 FLB (As Per Temper HB)
Range (mm) |
From |
To |
UTS Min (MPa) |
PS Min (MPa) |
Elongation Min (%) |
Hardness Min |
Hardness Max |
|
| Round (Dia) | 1.5 |
75 |
310 |
– |
25 |
– |
– |
|
| Hex (A/F) | 3 |
70 |
310 |
– |
25 |
– |
– |
|
| Square (A/F) | 3 |
60 |
310 |
– |
25 |
– |
– |
|
| Rectangle (Thickness) | 3 |
50 |
310 |
– |
25 |
– |
– |
|
Physical Properties |
Metric |
English |
| Density | 8.40 g/cc |
0.303 lb/in3 |
| CTE, linear | 26.0 ᶙm/m-˚C |
14.4 ᶙin/in-˚F |
| Specific Heat Capacity | 0.380 J/g-˚C |
0.0908 BTU/lb-˚F |
| Thermal Conductivity | 113 W/m-K |
784 BTU-in/hr-ft²-˚F |
| Melting Point | 880-900 ˚C |
1620 – 1650 ˚F |
| Solidus | 880 ˚C |
1620 ˚F |
| Liquidus | 900 ˚C |
1650˚F |
Fabrication Properties
Forming |
Suitability |
| Machinability (CuZn39Pb3 = 100 %) | 95.00% |
| Capacity for Being Cold Worked | Poor |
| Capacity for Being Hot Worked | Excellent |
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