ASTM A213 T11 Alloy Steel Seamless Serrated Fin Tube For Heat Exchanger
ASTM A213 T11 Seamless Serrated Fin Tube
I. Product Overview
ASTM A213 T11 seamless serrated fin tubes are manufactured from T11 chromiummolybdenum alloy steel, designed for medium-high temperature and pressure applications. With a nominal composition of 1.25% chromium and 0.5% molybdenum, this grade provides good oxidation resistance, elevated temperature strength, and structural stability under prolonged thermal exposure. The tubes are produced using seamless base pipes combined with helically wound serrated fins, which are mechanically embedded or welded to create a continuous, durable bond. The serrated fin design enhances turbulence and disrupts thermal boundary layers, significantly improving heat transfer efficiency compared to smooth fins. This construction maintains excellent pressure integrity and is suitable for use in boilers, heat exchangers, and other high-temperature pressure systems. Available in custom sizes and fin geometries, T11 serrated fin tubes meet diverse industrial needs where reliable performance under thermal stress is essential.
II. Chemical & Mechanical Properties
Base Tube Chemical Composition (%)
|
Element |
C |
Si (max) |
Mn |
P (max) |
S (max) |
Cr |
Mo |
|
Range |
0.05–0.15 |
0.50–1.00 |
0.30–0.60 |
0.025 |
0.025 |
1.00–1.50 |
0.44–0.65 |
Mechanical Properties (Base Tube)
|
Tensile Strength (min) |
Yield Strength (min) |
Elongation (min) |
|
415 MPa |
205 MPa |
30% |
III. Equivalent Material of T11
|
ASTM |
EN/DIN |
UNS |
JIS |
GB |
Common Name |
|
A213 T11 |
13CrMo4-5 |
K11597 |
STPA23 |
15CrMoG |
1.25Cr-0.5Mo |
IV. Comparison: T11 vs T9 & T22 Alloy Steels
|
Key Index |
P11 (1.25Cr-0.5Mo) |
P22 (2.25Cr-1Mo) |
P9 (9Cr-1Mo) |
|
Core Advantage |
Ultra cost-effective, excellent weldability |
Balanced performance |
Ultra-high temp/creep/corrosion resistance |
|
Max Service Temp |
540~550°C |
565~600°C |
650~675°C |
|
Key Application |
Low-temp power parts, general industrial heat transfer |
Subcritical power components |
Supercritical/ultrasupercritical power, ultra-high temp petro |
|
Weldability |
Excellent |
Good |
Fair |
|
Relative Cost (P11=1) |
1 |
1.3~1.5 |
2.0~2.5 |
|
Availability |
Very High (stock) |
High (stock) |
Medium (custom) |
|
Fin Tube Production Cost |
Lowest |
Medium |
Highest |
V. Key Applications
● Power & Steam Generation: Boiler superheater and reheater tubes, steam piping, and economizer sections in thermal power plants.
● Petrochemical Heaters: Convection and radiant section tubes in refinery process heaters, cracking furnaces, and reformer units.
● Heat Exchangers & Waste Heat Recovery: Medium-temperature heat recovery coils, air preheaters, and process gas coolers in chemical and industrial plants.
● Industrial Boilers: Steam generation tubes, boiler bank sections, and auxiliary heat transfer surfaces in manufacturing and processing facilities.
● Cogeneration & Distributed Energy: Heat transfer tubing in biomass, waste-to-energy, and combined heat and power (CHP) systems.
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