ASTM A312 TP347H Pipe | ASTM A312 TP347 Seamless Stainless Steel Pipe
Stabilized Austenitic Stainless Steel Pipes for High-Temperature Service
ASTM A312 TP347H pipes and ASTM A312 TP347 seamless stainless steel pipes are niobium-stabilized austenitic stainless steel pipes designed for high-temperature, high-pressure, and corrosive service environments. Manufactured in accordance with ASTM A312, these pipes provide excellent resistance to intergranular corrosion, oxidation, and creep deformation, making them ideal for continuous elevated-temperature applications.
TP347 and TP347H pipes are widely used in oil refineries, petrochemical plants, power generation facilities, and high-temperature process piping systems.Stabilized Austenitic Stainless Steel Pipes for High-Temperature Service
We are the professional exporter and supplier of ASTM A312 TP347H Seamless Stainless Steel Pipe,SA 312 TP347H pipe,ASTM A312 TP347 Seamless Stainless Steel Pipe.
What Is ASTM A312?
ASTM A312 is the standard specification for seamless, welded, and heavily cold-worked austenitic stainless steel pipes intended for high-temperature and general corrosive service. It defines requirements for:
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Chemical composition
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Mechanical properties
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Heat treatment
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Dimensional tolerances
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Testing and inspection
Material Grades: TP347 & TP347H Stainless Steel
ASTM A312 TP347
TP347 is a niobium-stabilized (Nb) austenitic stainless steel that prevents chromium carbide precipitation during welding or high-temperature exposure, improving resistance to intergranular corrosion.
TP347H stainless steel pipe is a high carbon austenitic stainless steel pipe, with an excellent heat-resistance material which is applied to boiler, heat exchanger, car and aircraft exhaust, chemical equipment etc. As a higher grade from AISI 321H, the intergranular corrosion of 347H is achieved through the use of niobium (Nb) as a stabilizing element to maximize this feature. SS 347 has a good mechanical properties welding performance, excellent resistance to intergranular corrosion .
ASTM A312 TP347H Pipe specification.
Grade: TP347, TP347H,
Standard:Astm A312
Size: OD: 10.3-762mm WT: 1-50mm
Length: fixed length or random
Delivery condition: annealing/pickling/ passivization
Packaging: bundle, plywood case.
seamless, straight-seam welded, and heavily cold worked welded austenitic stainless steel pipe intended for high-temperature and general corrosive service.
TP347 S34709 stainless steel are austenitic stainless steels that contain stabilizing elements. This alloys is easily welded. Annealing may not be required after welding unless stress relief is desired. 347 stainless steel has excellent resistance to oxidation and corrosion. With high creep strength, 347 stainless steel work best up to 1600 °F. The addition columbium plus tantalum in 347 stainless steel give some desired characteristic.
A312 TP347H pipe is mainly used where corrosion resistance and sustained operations at temperatures between 800°F and 1500°F (427°C ~ 816°C) is of the utmost importance. It is also a superior grade for use on heavy welded objects, which cannot be re-annealed.
ASTM A 312
Standard Specification for Seamless, Welded, and Heavily Cold Worked Austenitic Stainless Steel Pipes
ASTM A312 TP347H Pipe Equivalent Material
Material Comparision of Stainless Steel 347 of ASTM –EN –JIS -China
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China – GB |
Japan |
USA |
KS |
EN/DIN |
AS |
CNS |
DIN |
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Grade |
New(GB24511) |
JIS |
ASTM |
UNS |
Grade |
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S34700 |
06Cr18Ni11Nb |
SUS347 |
347 |
S34700 |
STS347 |
1.4550 |
347 |
347 |
X6CrNiNb18-10 |
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S34709 |
07Cr18Ni11Nb |
SUS347HTB |
347H |
S34709 |
STS347H |
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| A312 Grade | UNS | C | Mn | P | S | Si | Cr | Ni | |
| TP347H | S34709 | 0.04-0.10 | ≤2.00 | ≤0.045 | ≤0.030 | ≤1.00 | 17.0-19.0 | 9.00-13.00 | |
A312 TP347H Stainless pipe Heat Treatment and Gain Size Requirement
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Stainless Pipe Grade |
A312 TP347H |
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UNS Number |
S34709 |
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Heat Treat Type |
Solution Treatment |
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Solutioning Temperature |
1900 |
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Cooling Media |
Water of rapid cool |
Tests and Inspection Of ASTM A347 TP347H Stainless Steel Pipe
Surface Condition
Tests and Inspection Of ASTM A347 TP321 Stainless Steel Pipe
How to order our A347 TP347H Pipe?
Example#1,A312 TP347H, 14 inch Stainless Steel Seamless Pipe,Sch 140,6000mm length
ASTM A312 TP347H pipes and ASTM A312 TP347 seamless stainless steel pipes provide excellent resistance to intergranular corrosion, oxidation, and creep deformation in high-temperature pressure piping systems. Fully compliant with ASTM A312, TP347 / TP347H pipes are a proven solution for refineries, power plants, and critical industrial applications.
