ASTM B21 / B21M
This specification establishes the requirements for naval brass rod, bar, and shapes produced from Copper Alloy UNS Nos. C46200, C46400, C47940, C48200, or C48500. For piston-finish rod or shafting refer to the Other Requirements Section.For hot forging material, refer to Specification B 124/B 124M.
Chemical Properties
| Copper Alloy UNS No. | Copper | Tin | Lead | Zinc | Iron | NickelA |
|---|---|---|---|---|---|---|
| C46200 | 62.0–65.0 | 0.50–1.0 | 0.20 max | remainder | 0.10 max | ... |
| C46400 | 59.0–62.0 | 0.50–1.0 | 0.20 max | remainder | 0.10 max | ... |
| C47940 | 63.0–66.0 | 1.2–2.0 | 1.0–2.0 | remainder | 0.10–1.0 | 0.10–0.50 |
| C48200 | 59.0–62.0 | 0.50–1.0 | 0.40–1.0 | remainder | 0.10 max | ... |
| C48500 | 59.0–62.0 | 0.50–1.0 | 1.3–2.2 | remainder | 0.10 max | ... |
Note:
A Including cobalt.
Mechanical Properties, [inch-pound]
| Temper Designation Standard Name | Material Conditions | Diameter or Distance Between ParallelA Surfaces, in. | Tensile Strength, min, ksi | Yield Strength at 0.5 % Extension Under Load, min, ksi | Elongation in 4 x Diameter or Thickness of Specimen, min, %B |
|---|---|---|---|---|---|
| Copper Alloy UNS No. C46200 | |||||
| M30 | as-hot extruded | all forms, all sizes | 50 | 20 | 30 |
| O60 | soft anneal | rods and bars, all sizes | 48 | 16 | 30 |
| O50 | light anneal | rods and bars: | |||
| 0.500 and under | 58 | 27 | 22 | ||
| over 0.500 to 1.000, incl | 56 | 27 | 25 | ||
| over 1.000 to 2.000, incl | 54 | 26 | 25 | ||
| over 2.000 to 3.000, incl | 52 | 25 | 27 | ||
| over 3.000 to 4.000, incl | 50 | 22 | 30 | ||
| over 4.000 | 50 | 20 | 30 | ||
| H60 | cold heading, forming rods, | all sizes | 48 | 18 | 22 |
| H02 | half-hard | rods and bars: | |||
| 0.500 and under | 58 | 27 | 22 | ||
| over 0.500 to 1.000, incl | 56 | 27 | 25 | ||
| over 1.000 to 2.000, incl | 54 | 26 | 25 | ||
| over 2.000 to 3.000, incl | 52 | 25 | 27 | ||
| over 3.000 to 4.000, incl | 50 | 22 | 30 | ||
| over 4.000 | 50 | 20 | 30 | ||
| H04 | hard | rods and bars: | |||
| 0.500 and under | 64 | 40 | 13 | ||
| over 0.500 to 1.000, incl | 62 | 38 | 13 | ||
| over 1.000 to 2.000, incl | 58 | 34 | 18 | ||
| Copper Alloy UNS No. C46400 | |||||
| M30 | as-hot extruded | all forms, all sizes | 52 | 20 | 30 |
| O60 | soft anneal | rods and bars: | |||
| 1.000 and under | 54 | 20 | 30 | ||
| over 1.000 to 2.000, incl | 52 | 20 | 30 | ||
| over 2.000 | 50 | 20 | 30 | ||
| shapes, all sizes | 52 | 20 | 30 | ||
| O50 | light anneal | rods and bars: | |||
| 0.500 and under | 60 | 27 | 22 | ||
| over 0.500 to 1.000, incl | 60 | 27 | 25 | ||
| over 1.000 to 2.000, incl | 58 | 26 | 25 | ||
| over 2.000 to 3.000, incl | 54 | 25 | 25 | ||
| over 3.000 to 4.000, incl | 54 | 22 | 27 | ||
| over 4.000 | 54 | 22 | 30 | ||
| H50C | extruded and drawnC | shapes, all sizes | 58 | 25 | 20 |
| H02 | half-hard | rods and bars: | |||
| 0.500 and under | 60 | 27 | 22 | ||
| over 0.500 to 1.000, incl | 60 | 27 | 25 | ||
| over 1.000 to 2.000, incl | 58 | 26 | 25 | ||
| over 2.000 to 3.000, incl | 54 | 25 | 25 | ||
| over 3.000 to 4.000, incl | 54 | 22 | 27 | ||
| over 4.000 | 54 | 22 | 30 | ||
| H04 | hard | rods and bars: | |||
| 1.000 and under | 67 | 45 | 13 | ||
| over 1.000 to 2.000, incl | 62 | 37 | 18 | ||
| Copper Alloy UNS No. C47940 | |||||
| M30 | as-hot extruded | all forms, all sizes | 50 | 20 | 30 |
| O60 | soft anneal | rods and bars, all sizes | 48 | 20 | 30 |
| O50 | light anneal | rods and bars: | |||
| 0.500 and under | 58 | 30 | 18 | ||
| over 0.500 to 1.000, incl | 56 | 30 | 20 | ||
| over 1.000 to 2.0, incl | 54 | 25 | 22 | ||
| over 2.000 | 50 | 25 | 25 | ||
| H50C | extruded and drawnC | shapes, all sizes | 56 | 25 | 20 |
| H02 | half-hard | rods and bars: | |||
| 0.500 and under | 58 | 30 | 18 | ||
| over 0.500 to 1.000, incl | 56 | 30 | 20 | ||
| over 1.000 to 2.000, incl | 54 | 25 | 22 | ||
| over 2.000 | 50 | 25 | 25 | ||
| H04 | hard | rods and bars: | |||
| 0.500 and under | 70 | 55 | 10 | ||
| over 0.500 to 1.000, incl | 65 | 52 | 13 | ||
| over 1.000 to 2.000, incl | 62 | 45 | 15 | ||
| Copper Alloy UNS No. C48200 | |||||
| M30 | as-hot extruded | all forms, all sizes | 52 | 20 | 25 |
| O60 | soft anneal | rods and bars: | |||
| 1.000 and under | 54 | 20 | 25 | ||
| over 1.000 to 2.000, incl | 52 | 20 | 25 | ||
| over 2.000 | 50 | 20 | 25 | ||
| shapes, all sizes | 52 | 20 | 25 | ||
| O50 | light anneal | rods and bars: | |||
| 1.000 and under | 60 | 27 | 18 | ||
| over 1.000 to 2.000, incl | 58 | 26 | 20 | ||
| over 2.000 to 3.000, incl | 54 | 25 | 20 | ||
| over 3.000 to 4.000, incl | 54 | 22 | 20 | ||
| over 4.000 | 54 | 22 | 25 | ||
| H50C | extruded and drawnC | shapes, all sizes | 58 | 25 | 15 |
| H02 | half-hard | rods and bars: | |||
| 1.000 and under | 60 | 27 | 18 | ||
| over 1.000 to 2.000, incl | 58 | 26 | 20 | ||
| over 2.000 to 3.000, incl | 54 | 25 | 20 | ||
| over 3.000 to 4.000, incl | 54 | 22 | 20 | ||
| over 4.000 | 54 | 22 | 25 | ||
| H04 | hard | rods and bars: | |||
| 1.000 and under | 67 | 45 | 11 | ||
| over 1.000 to 2.000, incl | 62 | 37 | 15 | ||
| Copper Alloy UNS No. C48500 | |||||
| M30 | as-hot extruded | all forms, all sizes | 52 | 20 | 20 |
| O60 | soft anneal | rods and bars: | |||
| 1.000 and under | 54 | 20 | 20 | ||
| over 1.000 to 2.000, incl | 52 | 20 | 20 | ||
| over 2.000 | 50 | 20 | 20 | ||
| shapes, all sizes | 52 | 20 | 20 | ||
| O50 | light anneal | rods and bars: | |||
| 1.000 and under | 60 | 27 | 12 | ||
| over 1.000 to 2.000, incl | 58 | 26 | 20 | ||
| over 2.000 to 3.000, incl | 54 | 25 | 20 | ||
| over 3.000 to 4.000, incl | 54 | 22 | 20 | ||
| over 4.000 | 54 | 22 | 25 | ||
| H50C | extruded and drawnC | shapes, all sizes | 58 | 25 | 15 |
| H02 | half-hard | rods and bars: | |||
| 1.000 and under | 60 | 27 | 12 | ||
| over 1.000 to 2.000, incl | 58 | 26 | 20 | ||
| over 2.000 to 3.000, incl | 54 | 25 | 20 | ||
| over 3.000 to 4.000, incl | 54 | 22 | 20 | ||
| over 4.000 | 54 | 22 | 20 | ||
| H04 | hard | rods and bars: | |||
| 1.000 and under | 67 | 45 | 10 | ||
| over 1.000 to 2.000, incl | 62 | 37 | 13 | ||
Note:
A For rectangular bar, the Distance Between Parallel Surfaces refers to thickness.
B In any case, a minimum gage length of 1 in. shall be used.
C This temper does not apply to hollow shapes.
Mechanical Properties, [SI]
| Temper Designation Standard Name | Material Conditions | Diameter or Distance Between ParallelA Surfaces, in. | Tensile Strength, min, MPa | Yield Strength at 0.5 % Extension Under Load, min, MPa | Elongation in 4 x Diameter or Thickness of Specimen, min, %B |
|---|---|---|---|---|---|
| Copper Alloy UNS No. C46200 | |||||
| M30 | as-hot extruded | all forms, all sizes | 345 | 140 | 30 |
| O60 | soft anneal | rods and bars, all sizes | 330 | 110 | 30 |
| O50 | light anneal | rods and bars: | |||
| 12 and under | 400 | 185 | 22 | ||
| over 12 to 25, incl | 385 | 185 | 25 | ||
| over 25 to 50, incl | 370 | 180 | 25 | ||
| over 50 to 75, incl | 360 | 170 | 27 | ||
| over 75 to 100, incl | 345 | 150 | 30 | ||
| over 100 | 345 | 140 | 30 | ||
| H60 | cold heading, forming rods, | rods, all sizes | 330 | 125 | 22 |
| H02 | half-hard | rods and bars: | |||
| 12 and under | 400 | 185 | 22 | ||
| over 12 to 25, incl | 385 | 185 | 25 | ||
| over 25 to 50, incl | 370 | 180 | 25 | ||
| over 50 to 75, incl | 360 | 170 | 27 | ||
| over 75 to 100, incl | 345 | 150 | 30 | ||
| over 100 | 345 | 140 | 30 | ||
| H04 | hard | rods and bars: | |||
| 12 and under | 440 | 275 | 13 | ||
| over 12 to 25, incl | 425 | 260 | 13 | ||
| over 25 to 50, incl | 400 | 235 | 18 | ||
| Copper Alloy UNS No. C46400 | |||||
| M30 | as-hot extruded | all forms, all sizes | 360 | 140 | 30 |
| O60 | soft anneal | rods and bars: | |||
| 25 and under | 370 | 140 | 30 | ||
| over 25 to 50, incl | 360 | 140 | 30 | ||
| over 50 | 345 | 140 | 30 | ||
| shapes, all sizes | 360 | 140 | 30 | ||
| O50 | light anneal | rods and bars: | |||
| 12 and under | 415 | 185 | 22 | ||
| over 12 to 25, incl | 415 | 185 | 25 | ||
| over 25 to 50, incl | 400 | 180 | 25 | ||
| over 50 to 75, incl | 370 | 170 | 25 | ||
| over 75 to 100, incl | 370 | 150 | 27 | ||
| over 100 | 370 | 150 | 30 | ||
| H50C | extruded and drawnC | shapes, all sizes | 400 | 170 | 20 |
| H02 | half-hard | rods and bars: | |||
| 12 and under | 415 | 185 | 22 | ||
| over 12 to 25, incl | 415 | 185 | 25 | ||
| over 25 to 50, incl | 400 | 180 | 25 | ||
| over 50 to 75, incl | 370 | 170 | 25 | ||
| over 75 to 100, incl | 370 | 150 | 27 | ||
| over 100 | 370 | 150 | 30 | ||
| H04 | hard | rods and bars: | |||
| 25 and under | 460 | 310 | 13 | ||
| over 25 to 50, incl | 425 | 255 | 18 | ||
| Copper Alloy UNS No. C47940 | |||||
| M30 | as-hot extruded | all forms, all sizes | 345 | 140 | 30 |
| O60 | soft anneal | rods and bars, all sizes | 330 | 140 | 30 |
| O50 | light anneal | rods and bars: | |||
| 12 and under | 400 | 210 | 18 | ||
| over 12 to 25, incl | 390 | 210 | 20 | ||
| over 25 to 50, incl | 375 | 175 | 22 | ||
| over 50 | 345 | 175 | 25 | ||
| H50C | extruded and drawnC | shapes, all sizes | 390 | 175 | 20 |
| H02 | half-hard | rods and bars: | |||
| 12 and under | 400 | 210 | 18 | ||
| over 12 to 25, incl | 390 | 210 | 20 | ||
| over 25 to 50, incl | 375 | 175 | 22 | ||
| over 50 | 345 | 175 | 25 | ||
| H04 | hard | rods and bars: | |||
| 12 and under | 485 | 380 | 10 | ||
| over 12 to 25, incl | 450 | 360 | 13 | ||
| over 25 to 50, incl | 430 | 310 | 15 | ||
| Copper Alloy UNS No. C48200 | |||||
| M30 | as-hot extruded | all forms, all sizes | 360 | 140 | 25 |
| O60 | soft anneal | rods and bars: | |||
| 25 and under | 370 | 140 | 25 | ||
| over 25 to 50, incl | 360 | 140 | 25 | ||
| over 50 | 345 | 140 | 25 | ||
| shapes, all sizes | 360 | 140 | 25 | ||
| O50 | light anneal | rods and bars: | |||
| 25 and under | 415 | 185 | 18 | ||
| over 25 to 50, incl | 400 | 180 | 20 | ||
| over 50 to 75, incl | 370 | 170 | 20 | ||
| over 75 to 100, incl | 370 | 150 | 20 | ||
| over 100 | 370 | 150 | 25 | ||
| H50C | extruded and drawnC | shapes, all sizes | 400 | 170 | 15 |
| H02 | half-hard | rods and bars: | |||
| 25 and under | 415 | 185 | 18 | ||
| over 25 to 50, incl | 400 | 180 | 20 | ||
| over 50 to 75, incl | 370 | 170 | 20 | ||
| over 75 to 100, incl | 370 | 150 | 20 | ||
| over 100 | 370 | 150 | 25 | ||
| H04 | hard | rods and bars: | |||
| 25 and under | 460 | 310 | 11 | ||
| over 25 to 50, incl | 425 | 255 | 15 | ||
| Copper Alloy UNS No. C48500 | |||||
| M30 | as-hot extruded | all forms, all sizes | 360 | 140 | 20 |
| O60 | soft anneal | rods and bars: | |||
| 25 and under | 370 | 140 | 20 | ||
| over 25 to 50, incl | 360 | 140 | 20 | ||
| over 50 | 345 | 140 | 20 | ||
| shapes, all sizes | 360 | 140 | 20 | ||
| O50 | light anneal | rods and bars: | |||
| 25 and under | 415 | 185 | 12 | ||
| over 25 to 50, incl | 400 | 180 | 20 | ||
| over 50 to 75, incl | 370 | 170 | 20 | ||
| over 75 to 100, incl | 370 | 150 | 20 | ||
| over 100 | 370 | 150 | 20 | ||
| H50C | extruded and drawnC | shapes, all sizes | 400 | 170 | 15 |
| H02 | half-hard | rods and bars: | |||
| 25 and under | 415 | 185 | 12 | ||
| over 25 to 50, incl | 400 | 180 | 20 | ||
| over 50 to 75, incl | 370 | 170 | 20 | ||
| over 75 to 100, incl | 370 | 150 | 20 | ||
| over 100 | 370 | 150 | 20 | ||
| H04 | hard | rods and bars: | |||
| 25 and under | 460 | 310 | 10 | ||
| over 25 to 50, incl | 425 | 255 | 13 | ||
Note:
A For rectangular bar, the Distance Between Parallel Surfaces refers to thickness.
B In any case, a minimum gage length of 25 mm shall be used.
C This temper does not apply to hollow shapes.
