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TP347H flanged sleeve is a high-performance stainless steel pipe connector. The flange and sleeve are forged as one piece. It is designed for pipe systems that work under high temperature, high pressure, and corrosive fluids. The material is TP347H (1Cr19Ni11Nb, new grade 07Cr18Ni11Nb), a high-carbon niobium-stabilized austenitic stainless steel. It has the reliable sealing of a flange joint and the easy installation of a sleeve structure. It is widely used in power station boilers, petrochemical plants, nuclear power plants, and other places, for high-temperature steam pipes, superheater systems, and heat exchanger tubes.
Jiangyin Eternal Heavy Industry Co., Ltd makes the TP347H flanged sleeve by forging, so the flange and sleeve are one part. No welding is needed on site to join them. This reduces the number of welds and lowers the risk of weld failure under high temperature and high pressure. The TP347H flanged sleeve can be used with elbows, tees, pipe supports, and hangers to form a complete pipe system.
Standard | Grade |
GB | 07Cr18Ni11Nb（New）/ 1Cr19Ni11Nb（Old） |
ASTM | F347H/ TP347H |
UNS | S34709 |
ISO | X7CrNiNb18-10 |
EN | X7CrNiNb18-10 / 1.4912 |
JIS | SUS347H |
Element | TP347H（ASTMA182/A213） | Value |
C | 0.04 – 0.10 | ≤0.10 |
Si | ≤1.00 | ≤1.00 |
Mn | ≤2.00 | ≤2.00 |
Cr | 17.00 – 20.00 | 17.0-20.0 |
Ni | 9.00 – 13.00 | 9.0-13.0 |
Nb | 8×C% – 1.10 | 8×C%-1.5 |
P | ≤0.045 | ≤0.045 |
S | ≤0.030 | ≤0.030 |
TP347H contains the stabilizing element niobium (Nb), which effectively enhances the material's resistance to intergranular corrosion and its ability to withstand multi-sulfuric acid intergranular stress corrosion. This steel type has higher high-temperature strength and better resistance to high-temperature oxidation compared to the 316 series, and is commonly used as a heat-resistant steel.
Performance index | ASTMA182 Value |
Tensile strength σb | ≥515 MPa (75 ksi) |
Yield strength Rp0.2 | ≥205 MPa (30 ksi) |
Elongation percentage δ | ≥30% |
Reduction of area ψ | ≥50% |
Hardness | ≤192 HB / 90 HRB |
TP347H maintains excellent mechanical properties even at high temperatures: 392-429 MPa at 500℃, 363-382 MPa at 600℃, and 245-304 MPa at 700℃.
Excellent high-temperature resistance – Pressure parts can work up to 650°C. Oxidation-resistant parts can work up to 750–850°C. It stays stable under extreme conditions like supercritical and ultra‑supercritical boilers.
Strong resistance to intergranular corrosion – It contains niobium, which stops chromium from losing at grain boundaries. It resists acids, alkalis, and salts well. It passes intergranular corrosion tests by T method, L method, and X method.
Good high-temperature strength and creep resistance – It can work at up to 871°C. Its high‑temperature stress‑rupture strength is good – at 750°C and 120 MPa, the rupture life is 230 hours.
Good resistance to high‑temperature oxidation – It has stable oxidation resistance in air at 750–800°C.
Good weldability – Niobium does not burn off easily like titanium. It can be used as filler metal for welding chromium‑nickel austenitic stainless steel. It connects well with stub ends and valves.
One‑piece forging – The flange and sleeve are forged together. This removes weak welding points. Sealing is reliable and installation is easy.
1. Power Industry (Power Station Boilers)
TP347H is a key material for supercritical and ultra‑supercritical thermal power units. The flanged sleeve is mainly used for:
High‑temperature superheater pipe connections
High‑temperature reheater pipe systems
High‑temperature section of platen superheaters
Steam pipe connections
Large power station boilers with subcritical and supercritical pressure parameters
2. Petrochemical Industry
Heat exchanger pipe connections in petrochemical plants
High‑pressure hydrogen piping parts for hydrocracking units
Stainless steel pipe parts for coal liquefaction projects
Pipes for gasoline, diesel, residual oil, wax oil, and other media
3. Nuclear Power and Energy Industry
High‑temperature parts of nuclear power station boilers
High‑pressure boiler tubes and thermal power tubes, working at 625–649°C and 30 MPa pressure
4. Other Industrial Fields
Exhaust manifolds and branch pipes for aero‑engines
Hot air pipes for turbine compressors
Corrosion‑resistant pipe systems for synthetic fiber, food, papermaking, and other industries
Prameter | Data |
Nominal diameter（DN） | DN15 ~ DN600 |
Pressure grade | Class 150 / 300 / 600 / 900 / 1500 / 2500 |
Standard | ANSI / ASME / DIN / JIS / GB |
Sleeve length | Customized according to the drawings or the working conditions requirements |
Inspection | Chemical composition analysis, mechanical property testing, intergranular corrosion test, non-destructive testing（UT/PT/RT） |
Applicable temperature range (with pressure) | ≤650℃ |
Applicable temperature range (with pressure) Applicable temperature range (anti-oxidation) | ≤750-850℃ |
Applicable pressure | 30MPa |
Applicable medium | Steam, hot water, oil products, acid-base salt solutions, hydrogen gas, etc. |
Connection type | Flange bolt connection |
Manufacturing process | Forging |
Full-process quality control – From raw material melting to final product inspection, we strictly follow ASTM A182/A213 standards.
Rich stock availability – Many sizes of flanged sleeves are kept in stock, ready for fast delivery.
Customization service – We can make non-standard sizes and parts for special working conditions according to your drawings.
Complete technical support – We offer selection advice, installation guidance, and after-sales service.
