Russia · GOST
L68
GOST 21646:2003 — GOST 21646
Chemical composition
| Element | min | max | Similar | Remarks |
|---|---|---|---|---|
| Bi | 0.002 | |||
| Cu | 67 | 70 | ||
| Fe | 0.1 | |||
| P | 0.01 | |||
| Pb | 0.03 | |||
| Sb | 0.005 | |||
| Total Others | 0.3 | |||
| Zn | Bal | Bal |
Mechanical properties
| Heat treatment / condition | Yield strength | Tensile strength | Elongation | Reduction of area | Impact energy | Hardness |
|---|---|---|---|---|---|---|
| steel tubes, Half hardened +P | ≥130；≥340 | ≥35 | HV 80–130 | |||
| steel tubes, Softened +M | ≥290 | ≥40 |
Physical properties
| Elastic modulus | Mean thermal expansion | Thermal conductivity | Specific heat | Resistivity | Density | Poisson's ratio |
|---|---|---|---|---|---|---|
| 94.14 | 389.00 | 8.60；8.50 |