SS 314 seamless pipe withstands up to 1150°C continuously. This makes it suitable for high-heat applications.
Stainless Steel 314 Seamless Pipes Manufacturer
Stainless Steel 314 Seamless Pipe is a high-alloy, high-silicon austenitic grade manufactured by Zhejiang Xintongda Special Steel Manufacturing Co., Ltd. (XTD). Certified under the UNS S31400 and EN 1.4841 standards, this specific grade undergoes production fully compliant with ASTM A312 TP314. It contains approximately 23–26% chromium and 19–22% nickel, with an elevated silicon content of 1.50–3.00% that contributes to its resistance to oxidation and scaling during high-temperature service. The combination of chromium, nickel, and silicon provides good resistance to carburisation and scaling under demanding thermal conditions, while the austenitic structure supports good weldability. SS 314 seamless pipe is suitable for furnace and heat-treatment components, heat exchangers, and radiant tubes exposed to sustained elevated temperatures. According to project requirements, XTD supplies 314 SS pipe in various outside diameters, wall thicknesses, and lengths. To support demanding industrial applications, this 314 stainless steel pipe can be supplied with controlled manufacturing processes, material documentation, and traceability.
Our 314 Seamless Stainless Steel Pipe meet the following specifications:
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Standard
ASTM A312
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OD Range
6-1016 mm
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Thickness
1-65 mm
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Length
≤ 18 m
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Technical Data
Technical Data
SS 314 Seamless Pipe Manufacturing Process
The manufacturing process of SS 314 seamless pipe starts with a thorough raw material inspection of solid round steel billet. This billet is then heated to a high temperature. The heated billet is then pierced using the hot rotary piercing (Mannesmann) process. Then a piercing mill pushes a mandrel through the center of the hot billet to form a hollow shell. Finally, the shell is elongated and sized using mandrel rolling. To achieve precise dimensions and a smooth surface finish, the pipe undergoes pickling followed by cold rolling or cold drawing. We then conduct solution annealing heat treatment to restore the material's mechanical properties and corrosion resistance. Finally, the pipes are cut to the right length and straightened.
What are the Key Features of 314 Stainless Steel Pipe?
There are 5 key features of 314 stainless steel pipes. These include corrosion resistance, high silicon content, durability and strength, ductility and formability, and superior oxidation resistance.
- Corrosion Resistance: This pipe resists corrosion effectively in mild and high-temperature oxidizing environments. A passive, chromium-rich oxide layer forms naturally on the surface. This constantly renews itself to protect the underlying metal.
- High Silicon Content: The 314 SS pipe contains a higher percentage of silicon often between 1.5-3%. This addition enhances the pipe's resistance to high-temperature oxidation and carburisation.
- Durability and Strength: SS 314 pipes have excellent long term toughness and can handle high mechanical stress. Its austenitic structure provides excellent mechanical stability. The chromium content contributes to strength retention and oxidation resistance in demanding thermal environments.
- Ductility and Formability: This pipe can be shaped, bent, and welded easily without cracking during fabrication. Its austenitic structure, provided mainly by a high nickel content, makes the material highly pliable.
- Superior Oxidation Resistance: The pipe can endure exposure to hot air and gases up to 1150°C without scaling or degradation. The combined effect of high chromium and the added silicon forms a tough, slow-growing protective scale at elevated temperatures.
ASTM A312 TP314 Seamless Pipe Equivalent Material
ASTM A312 TP314 Seamless (SMLS) pipe is popularly known as UNS S31400. Some other global equivalents include AISI/SAE 314, EN 1.4841, ISO X15CrNiSi25-21, GB 16Cr25Ni20Si2 and JIS SUS314.
| GRADE | UNS | GB | JIS | ISO | DIN/EN | GOST | |
| ISC | NEW | ||||||
| 314 | S31400 | S38340 | 1Cr25Ni20Si2 | - | X15CrNiSi25-21 | 1.4841 | 20Kh25N20S2 |
100% Certified Testing & Documentation
- EN 10204 3.1 and EN 10204 3.2 Material Test Certificates (MTC)
- Raw Materials Certificate
- 100% PMI
- Heat Treatment Charts
- Third-Party Inspection Report
- Surface roughness and size measurement
- Manufacturer Test Certificate (Impact Testing, Flattening, Flare, Bend, Hardness, Intergranular, Pitting Corrosion, Grain size, ET, UT, HT)
- Laboratory Test Certificate from the Government-Approved Lab
ASTM A312 SS 314 Seamless Pipe Applications
Specific use of the 314 SS seamless pipe in each application is mentioned below.
There are 7 applications of these pipes. These include:
High-Temperature Applications
Stainless Steel 314 seamless pipes are suitable for high-temperature applications. They withstand temperatures up to 1150°C (2102°F) in continuous service and approximately 1200°C (2192°F) in intermittent service, provided reducing sulphur gases are not present. They are ideal for furnaces, heat exchangers and thermal processing due to their oxidation resistance and strength at elevated temperatures.
Furnace Conveyor Systems
The SS 314 pipe forms the belts and rollers that move parts through industrial heat treatment furnaces. The material's exceptional resistance to scaling and oxidation prevents it from degrading in the hot, sometimes corrosive, furnace atmosphere.
Heat Exchangers
The ASTM A312 SS 314 pipe separates and transfers heat between different fluids or gases in demanding thermal systems. Its stability at high temperatures and corrosive media provides long-term efficiency without material breakdown.
Radiant Tubes
These are enclosed heating elements used inside furnaces to apply heat without direct flame contact with the treated product. The pipe’s superior high-temperature strength and oxidation resistance enable it to radiate intense heat reliably for long periods.
Equipment for Furnaces
The pipe is used for internal furnace parts like muffles, retorts, and flame tubes. Its ability to endure continuous thermal cycling without cracking, or losing shape is what makes it suitable for this critical equipment.
Heat Treatment Components
DIN 1.4841 pipe is a common choice for baskets, fixtures and racks that hold parts during annealing or quenching processes. It retains its strength at high temperatures and resists the rapid temperature changes involved in thermal treatment cycles.
Annealing and Carburising Boxes
These are containers used to hold materials that undergo specific atmosphere heat treatments. The high silicon content of the pipe provides excellent resistance to carburisation, which is the absorption of carbon that can otherwise cause material brittleness.
Frequently Asked Questions
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What is the maximum operating temperature for 314 seamless pipe?
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How is a 314 seamless pipe different from a welded pipe?The 314 seamless pipe is different from a welded pipe because the 314 seamless pipe doesn’t have a welded seam. This makes it stronger and more uniform in extreme temperatures. Welded pipes may face comparatively more problems with seams when they are under extreme thermal stress.
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What sizes are available for SS 314 seamless pipes?SS 314 pipes are available in schedules like SCH 5 to XXS. They also come in OD Range between 6 to 1016 mm, thickness ranging between 1 to 65 mm and lengths up to 18m.