TK APM Tubes are an advanced powder metallurgical, dispersion
strengthened, ferritic iron-chromium-aluminium alloy (FeCrAl alloy)
for use at tube temperatures up to 1250°C (2280°F).
TK APM tubes have good form stability at high temperature. TK
APM forms an excellent, non-scaling surface oxide, which gives good
protection in most furnace environments, i.e. oxidizing, sulphurous
and carburizing, as well as against deposits of carbon, ash, etc.
The combination of excellent oxidation properties and form
stability makes the alloy unique.
Typical applications for TK APM are as radiant tubes in
electrically or gas fired furnaces such as continuous galvanizing
furnaces, seal quench furnaces, holding furnaces and dosing
furnaces in the aluminium, zinc, lead industries, thermocouple
protection tubes, furnace muffles for sintering applications.
Composition(Wt%)
| C | Si | Mn | Cr | Al | Fe |
Min | - | - | - | 20 | 5.5 | Bal. |
Max | 0.04 | 0.5 | 0.4 | 22 | 6.0 | Bal. |
Mechanical Properties
Tensile Strength at Room Temperature | 650 - 750 MPa |
Elongation Rate | 15 -25% |
Hardness | 220 - 260 HV |
Tensile Strength at 1000℃ | 22 - 27 MPa |
High Temperature Durability at 1000℃ and 6MPa | ≥100 h |
Physical Properties
Density | 7.10 g/cm3 |
Resistivity | 1.45×10-6 Ω.m |
Melting Point | 1500 ℃ |
Maximum Continuous Working Temperature | 1400 ℃ |
Resistance Temperature Coefficient(Ct) | 800℃ | 1000℃ | 1400℃ |
1.03 | 1.04 | 1.05 |
Average Linear Expansion Coefficient | 20-800℃ | 20-1000℃ | 20-1400℃ |
14 | 15 | 16 |
Fast life
| 1300℃ | 1350℃ |
Average Fast Life (Hours) | 110 | 90 |
Sagging Rate After Rupture | 8 | 11 |
Specifications
Wire diameter range φ0.1-10mm