Boiler tubes are used in heat exchange appliances in which the energy is transferred from one medium to the other. The pipes are manufactured from carbon and low-alloy steel grades which are resistant to loads under high pressure and temperatures. They ar
| Elements | Min.（≥） | Max.（≤） | Similar | Remarks |
|---|---|---|---|---|
| C | 0.07 | 0.13 | ||
| Cr | 8.50 | 9.50 | ||
| Mn | 0.30 | 0.60 | ||
| Mo | 0.30 | 0.60 | ||
| N | 0.03 | 0.070 | ||
| Nb | 0.04 | 0.09 | ||
| Ni | - | 0.40 | ||
| P | - | 0.02 | ||
| S | - | 0.010 | ||
| Si | - | 0.50 | ||
| V | 0.15 | 0.25 | ||
| W | 1.50 | 2.00 | ||
| B | 0.0010 | 0.0060 | ||
| Al | - | 0.040 |
Boiler tubes are used in heat exchange appliances in which the energy is transferred from one medium to the other. The pipes are manufactured from carbon and low-alloy steel grades which are resistant to loads under high pressure and temperatures. They are used for the construction of power engineering appliances such as: boilers, heating coils, stoves, heaters, heat exchangers.
| Proof strength Rp0.2 (MPa) |
Tensile strength Rm (MPa) |
Impact energy KV (J) |
Elongation at fracture A (%) |
Reduction in cross section on fracture Z (%) |
As-Heat-Treated Condition | Brinell hardness (HBW) |
|---|---|---|---|---|---|---|
| 141 (≥) | 474 (≥) | 32 | 14 | 11 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 421 |
| Property | Density kg/dm3 |
Temperature T °C/F |
Specific heat J / kgK |
Thermal conductivity W/mK |
Electric resistance µΩ·cm |
Modulus of elasticity kN/mm2 |
Expansion rate |
|---|---|---|---|---|---|---|---|
| 881 (≥) | 623 (≥) | 44 | 23 | 21 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 234 | |
| Temp. °C/°F |
Creep strain limit (10000h) (Rp1,0) N/mm2 |
Creep rupture strength (10000h) (Rp1,0) N/mm2 |
|||||
| 591 | 118 | 621 |
We can customize the production of X10CrWMoVNb9 grade, contact us for the best solution.
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