ASTM A312 TP304H Stainless Steel HFW Solid Fin Tube For Power Plant
ASTM A312 TP304H HFW Solid Fin Tube
I. Product Overview
II. Chemical & Mechanical Properties
Base Tube Chemical Composition (%)
| Element | C | Si (max) | Mn (max) | P (max) | S (max) | Cr | Ni |
| Range | 0.04–0.10 | 0.75 | 2.00 | 0.045 | 0.030 | 18.0–20.0 | 8.0–11.0 |
Mechanical Properties (Base Tube)
| Tensile Strength (min) | Yield Strength (min) | Elongation (min) |
| 515 MPa | 205 MPa | 40% |
III. Equivalent Material of TP304H
| ASTM/AISI | UNS NO | EN | ISO | JIS | GB |
| TP304H | S30409 | 1.4948 | X7CrNi18-9 | SUS304H | 07Cr19Ni10 |
IV. Comparison: TP304H vs TP304 Stainless Steel
● HighTemperature Performance:
TP304H is optimized for sustained hightemperature operation with better creep strength and oxidation resistance.
TP304 is suitable for general corrosion resistance but may lose strength faster at temperatures above 500°C.
● Chemical Composition:
TP304H has controlled carbon content (0.04–0.10%) for hightemperature stability;
TP304 has lower carbon (≤0.08%) for general purpose use. Both contain Cr (~18–20%) and Ni (~8–11%).
● Applications:
TP304H: Boiler tubes, superheaters, heat exchangers in power plants, refinery heaters, hightemperature process piping.
TP304: General corrosionresistant piping, food processing equipment, architectural tubing, lowtemperature heat exchangers.
● Cost & Availability:
TP304H is typically more expensive due to its specialized hightemperature properties and controlled manufacturing;
TP304 is widely available and more economical for nonhightemperature applications.
V. Key Applications
● Power Generation: Superheater and reheater tubes in utility boilers, heat recovery steam generator (HRSG) systems for gas turbines.
● Petrochemical & Refining: High-temperature hydroprocessing reactors, reformer unit heat exchangers, and crude oil distillation column reboilers.
● Metallurgical Industry: Waste heat recovery systems for blast furnaces, heat exchange tubes in hot rolling mill furnaces.
● Industrial Boilers & Heaters: Convection bank tubes in industrial boilers, high-temperature thermal oil heaters.
● Chemical Processing: Jackets for high-temperature synthesis reactors, heat exchangers in catalyst regeneration systems.
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