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JIS G3446-1994 JIS G3448-1997 JIS G3459-1997 JIS G3463-1994,ect.
GB13296-1991 GB14975-2002 GB14976-2002,ect.
Size:
ND5 - DN400
Length:
6m length or cutting any length as request
Applications:
fluid and gas transport, structure , boiler, heat exchanger, super heater
TP347H stainless steel pipes, also known as Alloy 347H, are high-performance austenitic stainless steel seamless tubes renowned for exceptional high-temperature strength, corrosion resistance, and stability under prolonged heat exposure. Hot-rolled for enhanced structural integrity, these pipes are widely trusted in critical industrial applications where resistance to oxidation, creep, and intergranular corrosion is paramount. Produced to meet rigorous standards, they are ideal for high-pressure and high-temperature environments.
Key Parameters
Alloy Grade: TP347H (a niobium-stabilized austenitic stainless steel, with "H" indicating a higher carbon content for improved high-temperature strength).
Chemical Composition (Typical, %):
Chromium (Cr): 17.0 - 19.0 (boosts oxidation and corrosion resistance).
Nickel (Ni): 9.0 - 13.0 (stabilizes the austenitic structure, enhancing ductility and toughness).
Niobium (Nb) + Tantalum (Ta): 10×C - 1.00 (stabilizes carbides, preventing intergranular corrosion during welding or high-temperature service).
Carbon (C): 0.04 - 0.10 (higher carbon content compared to standard 347, improving creep strength at elevated temperatures).
Manganese (Mn): ≤ 2.0.
Silicon (Si): ≤ 0.75.
Phosphorus (P): ≤ 0.040.
Sulfur (S): ≤ 0.030.
Mechanical Properties:
Tensile Strength: ≥ 550 MPa.
Yield Strength: ≥ 205 MPa.
Elongation: ≥ 35% (in 50mm gauge length).
High-Temperature Performance: Maintains stability at continuous service temperatures up to 900°C, with excellent resistance to creep (slow deformation under constant load) and oxidation.
Standards
TP347H seamless pipes comply with globally recognized standards to ensure consistency and reliability:
ASTM A312/A312M (Standard Specification for Seamless and Welded Austenitic Stainless Steel Pipes).
ASTM A213/A213M (Standard Specification for Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, and Heat-Exchanger Tubes).
ASME SA312/SA213 (Codes for pressure vessel and boiler applications, widely adopted in energy and petrochemical industries).
EN 10216-5 (European standard for seamless steel tubes for pressure purposes, applicable to austenitic stainless steels).
Specifications
Form: Seamless tube (no welds, ensuring uniform strength and leak resistance, critical for high-pressure systems).
Processing: Hot-rolled (enhances grain structure, improving mechanical strength and suitability for high-temperature service).
Nominal Diameter (DN): DN10 to DN200 (equivalent to outer diameters approximately 17.2mm to 219.1mm, covering a range of industrial piping needs).
Wall Thickness: Typically 1.2mm to 12mm (customizable based on pressure and application requirements, with precise tolerances for seamless fit).
Length: Common lengths include 6m, 12m, or cut-to-size as per customer specifications.
Similar Grades
TP347H is part of a family of stabilized austenitic stainless steels, with several comparable grades:
TP321H: Titanium-stabilized instead of niobium, offering similar high-temperature performance but with slightly lower creep strength than 347H.
TP347: Lower carbon variant (C ≤ 0.08%) of 347H, suitable for moderate-temperature applications where high creep resistance is not required.
1.4550 (EN designation): European equivalent to TP347H, with matching chemical composition and mechanical properties.
TP316H: Molybdenum-containing (2-3% Mo) for enhanced corrosion resistance in chloride environments, with high-temperature strength comparable to 347H.
Applications
TP347H seamless pipes are engineered for demanding high-temperature and high-pressure environments, making them indispensable in:
Power Generation: Boiler tubes, superheaters, and reheaters in fossil fuel and nuclear power plants, where resistance to high heat and steam oxidation is critical.
Petrochemical Industry: Piping and heat exchangers in refineries and chemical plants, handling high-temperature hydrocarbons and corrosive process fluids.
Aerospace and Aviation: Exhaust systems and high-temperature ducting in aircraft engines, where structural stability under extreme heat is essential.
Oil and Gas: Downhole tubing and surface piping in high-temperature wells, resisting corrosion from aggressive reservoir fluids.
Industrial Furnaces: Piping for furnace components, radiant tubes, and heat recovery systems exposed to continuous high temperatures.
Company Details
Bronze Gleitlager
,
Bronze Sleeve Bushings
and
Graphite Plugged Bushings
from Quality China Factory
Business Type:
Manufacturer,Distributor/Wholesaler,Exporter
Total Annual:
>1000000
Employee Number:
>100
Ecer Certification：
Verified Supplier
Our company is located in Wuxi City, China, we are a stainless steel plate, seamless steel pipe, round steel, steel belt, decorative pipe and other products distribution wholesale private enterprise. Our company operates stainless steel plate, seamless steel pipe, round steel, steel belt, decorative... Our company is located in Wuxi City, China, we are a stainless steel plate, seamless steel pipe, round steel, steel belt, decorative pipe and other products distribution wholesale private enterprise. Our company operates stainless steel plate, seamless steel pipe, round steel, steel belt, decorative...
