ASTM A213 / ASME SA213 TP304H Stainless Steel Seamless Tube Heat Exchanger Tube
ASTM A213 / ASME SA213 TP304H Stainless Steel Seamless Tube BA Heat Exchanger Tube
ASTM A213 TP304H is the high-temperature variant of the common 304 stainless steel, specifically manufactured as a seamless tube for critical, high-pressure, high-heat applications like power plant boilers and superheaters. Its controlled chemistry and processing make it the material of choice where long-term creep resistance is paramount. Compared to 304/304L, TP304H prioritizes elevated temperature performance over maximum corrosion resistance or weldability, making material selection crucial. Mandatory solution annealing and rigorous non-destructive testing (eddy current, ultrasonic) under the ASTM A213 standard guarantee its reliability in demanding thermal cycles.
Key Characteristics & Advantages of Stainless Steel 304H:
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High-Temperature Strength: Excellent creep and stress rupture properties up to ~1500°F (~815°C).
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Corrosion Resistance: Good general resistance to oxidation, scaling, and a wide range of corrosive media.
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Excellent Formability & Weldability: Easy to fabricate and weld using standard techniques for austenitic stainless steels (though post-weld heat treatment may be required for high-temp service).
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Smooth Seamless Interior: Ideal for fluid flow, reduces pressure drop, and prevents clogging.
| Grade | UNS No | Old British | Euronorm | Swedish SS | Japanese JIS | ||
| BS | En | No | Name | ||||
| 304 | S30400 | 304S31 | 58E | 1.4301 | X5CrNi18-10 | 2332 | SUS 304 |
| 304L | S30403 | 304S11 | - | 1.4306 | X2CrNi19-11 | 2352 | SUS 304L |
| 304H | S30409 | 304S51 | - | 1.4948 | X6CrNi18-11 | - | - |
ASTM A213 TP304H Stainless Steel Seamless Tube Chemical Composition
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N | |
| 304 | min. | - | - | - | - | - | 18.0 | - | 8.0 | - |
| max. | 0.08 | 2.0 | 0.75 | 0.045 | 0.030 | 20.0 | 10.5 | 0.10 | ||
| 304L | min. | - | - | - | - | - | 18.0 | - | 8.0 | - |
| max. | 0.030 | 2.0 | 0.75 | 0.045 | 0.030 | 20.0 | 12.0 | 0.10 | ||
| 304H | min. | 0.04 | - | - | -0.045 | - | 18.0 | - | 8.0 | - |
| max. | 0.10 | 2.0 | 0.75 | 0.030 | 20.0 | 10.5 | ||||
ASTM A213 TP304H Stainless Steel Seamless Tube Mechanical Properties
| Grade |
Tensile Strength (MPa) min |
Yield Strength 0.2% Proof (MPa) min |
Elongation (% in 50mm) min |
Hardness | |
| Rockwell B (HR B) max | Brinell (HB) max | ||||
| 304 | 515 | 205 | 40 | 92 | 201 |
| 304L | 485 | 170 | 40 | 92 | 201 |
| 304H | 515 | 205 | 40 | 92 | 201 |
| 304H also has a requirement for a grain size of ASTM No 7 or coarser. | |||||
ASTM A213 TP304H Stainless Steel Seamless Tube (annealed condition) Physical Properties
Grade |
Density (kg/m3) | Elastic Modulus (GPa) | Mean Coefficient of Thermal Expansion (μm/m/°C) | Thermal Conductivity (W/m.K) | Specific Heat 0-100°C (J/kg.K) | Electrical Resistivity (nΩ.m) | |||
| 0-100°C | 0-315°C | 0-538°C | at 100°C | at 500°C | |||||
| 304/L/H | 8000 | 193 | 17.2 | 17.8 | 18.4 | 16.2 | 21.5 | 500 | 720 |
Application
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Superheater & Reheater Tubes in fossil-fuel power plants (primary application).
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Boiler Tubes in high-pressure steam boilers.
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Heat Exchanger Tubes in refinery and petrochemical processing.
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Process Piping for high-temperature chemical processes.
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Header Systems in power generation.
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