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Utilizing 26 high-precision cold rolling mills and 6 cold drawing machines, we ensure dimensional accuracy and superior mechanical properties.
TP316H High Pressure Seamless Tube
Controlled Carbon | UNS S31609 | High-Temperature Creep Strength
ASME SA312 | PED | Coarse Grain CertifiedRelated Products
Introduction
TP316H High Pressure Seamless Tube occupies a specific metallurgical niche within the 316 family: unlike TP316L, which minimizes carbon for corrosion resistance after welding, TP316H holds carbon in the 0.04% to 0.10% range deliberately to maximize creep rupture strength at elevated temperature. This higher carbon content, combined with a controlled coarse grain size of ASTM No. 7 or coarser, allows the tube to retain useful strength during long-term exposure to temperatures between 500°C and 800°C — conditions under which the low-carbon grades would show measurably lower time-dependent strength. The chromium-nickel-molybdenum balance also provides solid resistance to pitting and crevice corrosion, making this grade well suited to piping systems that combine high pressure, high temperature, and moderately aggressive process fluids.
Because it is manufactured as a true seamless tube — pierced and elongated from a solid billet rather than welded — TP316H eliminates the weld seam that would otherwise become the limiting factor in high-pressure, high-temperature calculations under ASME B31.1 and B31.3. Every tube is solution annealed after hot working to develop the coarse-grain austenitic structure required by the ASME Boiler and Pressure Vessel Code for H-grade materials, and each heat is tracked with full chemical and mechanical certification so that engineers can verify compliance with Section II material specifications before the tube enters fabrication.
Typical applications include main steam and reheat piping in fossil and combined-cycle power plants, high-temperature process piping in refineries and petrochemical crackers, and superheater or economizer connections where sustained pressure at temperature governs wall thickness selection. Because creep design allowable stresses for TP316H are published separately from TP316/TP316L in ASME Section II Part D, specifying TP316H explicitly — rather than generic 316 — is essential whenever the design temperature exceeds roughly 425°C and long-term creep life is part of the engineering calculation.
Specifications
| Material Grade | TP316H (UNS S31609) |
| Standard | ASTM A213 / A312, ASME SA213 / SA312 |
| Outer Diameter | 10mm - 219mm |
| Wall Thickness | 1.0mm - 25mm |
| Length | Up to 18000mm |
| Finish | Solution Annealed, Pickled |
Chemical Composition
| C | Cr | Ni | Mo | Mn |
| .04-.10 | 16-18 | 10-14 | 2.0-3.0 | ≤2.0 |
Creep Resistant Coarse Grain
Mechanical Strength
Comprehensive Info
| MOQ | 500kg |
| Lead Time | 25 - 40 Days |
| Testing | 100% UT & Hydro-test |
| Grain Size | ASTM No. 7 or Coarser |
Key Applications
Power Generation Main steam and reheat piping systems
Petrochemical High-temperature process and cracker lines
Superheaters Economizer and superheater connections
Advantages
Creep Rated
Published ASME Section II Part D allowable stress at temperature.
True Seamless
No weld seam to govern the high-pressure design case.
Corrosion Resistant
Molybdenum addition resists pitting in mild process fluids.
Traceable
Full heat certification per ASME Section II material specs.
About Jiangsu Jend Tube Co.,Ltd.
As China TP316H High Pressure Seamless Tube Manufacturers and Wholesale TP316H High Pressure Seamless Tube Factory, Established in 2011 and is a manufacturing enterprise with a complete manufacturing cycle from raw material selection to finished product delivery. The company currently has more than 100 employees, covers an area of 30015 square meters, and has a registered capital of 48 million yuan, annual production capacity of 3800 tons.
The company has passed ISO9001:2015 quality certification, domestic pressure vessel TS certification, and foreign pressure vessel PED certification. With rich experience and mature technology, we have been expanding our market internationally. At present, our products are exported to more than 50 countries and regions including Europe, America, Southeast Asia, and the Middle East.
The company adheres to different production norms and standards such as the American standard (ASTM), the European standard (EN), the German standard (DIN), the Japanese standard (JIS), the Russian standard (GOST), and the Chinese standard (GB).
Our company specializes in and customizes various specifications of Martensite TP410 (0Cr13, 1Cr13), Ferrite TP405 (1Cr13Al), TP430 (1Cr17), TP444 (0Cr18Mo2), TP439, TP409 (0Cr11Ti), It is also proficient in manufacturing Austenitic seamless stainless steel pipes of series such as TP304(L/H), TP316(L/H/Ti), TP310S, TP317, TP321(H) and TP347(H). Duplex such as S31803, S2205, S32750, S32304, and Nickel-based alloys Monel400, Monel600, Monel800, GH3030, 904L, Inconel 625, etc.
The company mainly produces seamless steel pipes with the following specifications: outer diameter: 3.18mm to 406.4mm, wall thickness: 0.3mm to 20mm, and the longest length is 25000mm. Additionally, it can customize seamless steel pipes with special materials and specifications according to customer requirements. The company attaches great importance to scientific innovation. The staff of the company vigorously develop technological research and development.
Jiangsu Jend Tube Co.,Ltd. will continuously accumulate professional knowledge and capabilities, striving to become a leader in the domestic market and even the world market. Strive to be the most reassuring pipe manufacturing enterprise for customers.
Precision Manufacturing and Process Optimization
We rely on precision equipment and optimized production technologies to achieve outstanding mechanical performance and consistent product quality.
Cold Rolling and Cold Drawing
Solution Heat Treatment
Natural gas solution treatment furnaces and BA solution treatment furnaces optimize the material's grain structure, enhancing corrosion resistance.
Precision Straightening and Polishing
10 straightening machines and 8 finishing polishing machines guarantee product surface smoothness and dimensional accuracy.
Automated Inspection and Quality Assurance
Real-time monitoring systems ensure the stable quality of every batch of products.
Usage Tips
Grain Size Verification
Always request mill certificates confirming ASTM No. 7 or coarser grain — fine-grain material will not meet H-grade creep allowables.
Design Temperature
Specify TP316H explicitly rather than generic 316 whenever design temperature exceeds approximately 425°C.
Services
Hydrostatic Testing
Full-length pressure testing to code requirements.
Precision Cutting
Length control within ±0.5mm for fabrication.
Heat Traceability
Individual heat number marking on each length.
Logistics
30% T/T Deposit / L/C at sight. Nitrogen end-capped and wrapped in VCI paper, packed in seaworthy wooden cases for humid or long-transit shipments.
Standards
ASME SA213/SA312
ASME Section II Part D
PED 2014/68/EU
ISO 9001
Frequently Asked Questions
How is TP316H different from TP316 and TP316L?
TP316H holds carbon between 0.04% and 0.10%, higher than TP316L's 0.03% cap, and requires a coarse grain structure to maximize creep rupture strength for elevated-temperature service.
At what temperature does the H-grade designation matter?
H-grade creep allowables become relevant above roughly 425°C, where time-dependent strength governs wall thickness rather than short-term yield strength.
Is TP316H suitable for cryogenic service?
It is not typically selected for cryogenic use; L-grade or standard grades with different heat treatment are more common for low-temperature applications.
What grain size is required?
ASME specifications require ASTM grain size number 7 or coarser to qualify for published H-grade creep design values.
Do you provide ASME Section II Part D compliance certificates?
Yes, each heat is supplied with full chemical and mechanical test reports referencing the applicable ASME material specification.
Can TP316H be welded in the field?
Yes, it is weldable with standard 316-type filler metal; however, the coarse grain structure should be preserved and post-weld heat treatment considered per project code requirements.
Ready to Order TP316H High Pressure Tube?
Send us your design temperature and pressure class for a code-compliant wall thickness recommendation.
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