ASTM A376 TP347H Fin Tube CS, High-Temperature Resistant Composite Fin Tube (CS Base + TP347H Fin)
Brief Introduction
ASTM A376 TP347H Fin Tube CS is a high-performance composite heat exchange tube, strictly manufactured in accordance with ASTM A376 (standard for seamless austenitic stainless steel tubes for high-temperature service) and ASTM A179 (standard for carbon steel base tubes), integrating the superior high-temperature resistance, corrosion resistance of TP347H stainless steel (fin part) and the excellent mechanical strength, pressure-bearing capacity and cost-effectiveness of carbon steel (CS, base tube)[1]. The product adopts an integrated fin forming process, which avoids the hidden dangers of fin detachment, corrosion and leakage compared with traditional welded fin tubes, ensuring long-term stable operation in high-temperature, high-pressure and corrosive working environments. TP347H stainless steel contains niobium (Nb) element, which can effectively inhibit intergranular corrosion, improve high-temperature creep resistance and oxidation resistance, while the carbon steel base tube ensures the overall pressure-bearing capacity of the tube and reduces the comprehensive cost. It is widely used in thermal power, petrochemical, boiler, metallurgical and other industries, providing efficient and reliable heat transfer solutions for high-temperature heat exchange equipment.
Chemical Composition Analysis (wt%)
| Material Part |
Element |
Content Range |
Element |
Content Range |
Element |
Content Range |
| Fin: TP347H Stainless Steel (ASTM A376) |
C |
0.04-0.10 |
Cr |
17.0-19.0 |
Ni |
9.0-13.0 |
| Nb+Ta |
8*C-1.00 |
Mn |
≤2.00 |
Si |
≤1.00 |
| Base Tube: 20# Carbon Steel (ASTM A179) |
C |
0.17-0.24 |
Mn |
0.35-0.65 |
Si |
0.17-0.37 |
| P |
≤0.035 |
S |
≤0.035 |
Fe |
≥98.8 |
Typical Mechanical Properties
| Mechanical Property |
TP347H Fin (Annealed) |
20# CS Base Tube (Annealed) |
Standard Requirement |
| Yield Strength (Rp0.2), MPa |
≥205 |
≥245 |
≥200 (TP347H); ≥245 (20# CS) |
| Tensile Strength (Rm), MPa |
515-690 |
410-550 |
≥515 (TP347H); ≥410 (20# CS) |
| Elongation (A), % |
≥35 |
≥25 |
≥35 (TP347H); ≥25 (20# CS) |
| Hardness (HB), Brinell |
≤187 |
≤156 |
≤187 (TP347H); ≤156 (20# CS) |
| Fin Bond Strength, MPa |
≥220 |
≥200 |
| High-Temperature Creep Strength (600℃), MPa |
≥100 |
≥80 |
≥90 (TP347H) |
Available Tests
| Test Type |
Standard |
| Chemical Composition Analysis (PMI) |
Spectrometer (XRF/OES), ASTM E1019, ASTM A213, ASTM A179 |
| Tensile & Impact Test |
ASTM E8/E8M, ASTM A370, Charpy V-Notch (Low Temperature) |
| Hardness Test |
ASTM E10 (Brinell), ASTM E18 (Rockwell), Vickers |
| Fin Bond Strength Test |
Pull-off Test, Bending Test, Hammer Test[1] |
| Corrosion Resistance Test |
ASTM B117 (Salt Spray), Intergranular Corrosion Test (ASTM A262) |
| Non-Destructive Testing (NDT) |
Eddy Current Test, UT (Ultrasonic), MT (Magnetic Particle), PT (Liquid Penetrant) |
| Hydrostatic/Pneumatic Pressure Test |
ASTM A179, ASTM A213, Pressure Test for Composite Tubes |
| Dimensional & Visual Inspection |
ASTM A213, ASTM A179, CMM, Gauge Inspection, Fin Size Tolerance Test |
| Material Test Certificate (MTC) |
EN 10204 3.1/3.2, ASTM A213, ASTM A179 |
| High-Temperature Creep Test |
ASTM E139, High-Temperature Creep Measurement Standard |
Product Application Scope
| Industry Field |
Typical Applications |
| Thermal Power Industry |
Power plant boilers, superheaters, reheaters, condensers, air preheaters, flue gas heat exchangers[1] |
| Petrochemical Industry |
Petroleum refining catalytic cracking equipment, hydrogenation reactors, heat exchangers, high-temperature flue gas recovery equipment[3] |
| Boiler & Pressure Vessel Industry |
Industrial boilers, waste heat boilers, boiler economizers, high-temperature and high-pressure heat exchange tubes[1] |
| Metallurgical Industry |
Metallurgical furnace heat exchangers, waste heat recovery systems, smelting equipment cooling tubes |
| Chemical Industry |
Chemical reaction kettle heat transfer tubes, high-temperature corrosive medium heat exchangers, organic synthesis equipment[3] |
| Other Fields |
Industrial waste heat recovery equipment, high-temperature flue gas treatment equipment, nuclear power auxiliary heat exchange equipment |
