Brazil · NBR
T 7
ABNT NBR 5584:1982 — Seamless chromium-molybdenum and chromium-molybdenum-silicon alloy steel tubes for heat exchangers
Chemical composition
| Element | min | max | Similar | Remarks |
|---|---|---|---|---|
| C | 0.15 | |||
| Cr | 6 | 8 | ||
| Mn | 0.3 | 0.6 | ||
| Mo | 0.45 | 0.65 | ||
| P | 0.03 | |||
| S | 0.03 | |||
| Si | 0.5 | 1 |
Mechanical properties
| Heat treatment / condition | Yield strength | Tensile strength | Elongation | Reduction of area | Impact energy | Hardness |
|---|---|---|---|---|---|---|
| Seamless tubes, cold drawn | ≥172 | ≥414 | ≥30 Lo=50 mm；≥33 L0=5.65 So |