Fujian Tengqi Pipe Industry Technology Co., Ltd

Engineering-driven services covering material selection, custom processing, full traceability, agile delivery, and after-sales technical support—so your project commissions faster and runs reliably.

ENGINEERING-GRADE SEAMLESSTUBES AND PIPES FOR CORROSION &PRESSURE CRITICAL APPLICATIONS.

Austenitic | Duplex | Super Duplex | Nickel Alloy Seamless Pipe & Tube


MANUFACTURER COMPLIANT WITH EN& ASTM....STANDARDS WITH FULLTRACEABILITY

High-Performance Stainless & Alloy
Tubes — Custom-Made, Fast Delivery

Seamless/Welded And Heat Exchanger Pipes & Tubes To ASTM/EN/DIN With Full MTC
And End-To- End NDT Test (Eddy Current/UT/Hydro test)

Fujian Tengqi Pipe Industry Technology Co., Ltd.
Austenitic /(Super) Duplex/ Nickel Alloy Steel

ENGINEERING CUSTOMIZATION

Flexible Grade/Size/Tolerance/Finish; Direct Engineer
Access With DFM Guidance

QUALITY ASSURANCE

Full-Process Control And 100% MTC Traceability; Optional 100% Dimensional/Surface Checks

RELIABLE LEAD TIME

Stock For Common Specs + Agile Lines To Hit Shutdown Windows And Project Milestones.

APPLICATION KNOW-HOW

Proven Solutions For Heat Exchanger, Oil & Gas, Chemicals/Pharma, And Marine

GLOBAL COMPLIANCE

ASTM/ASME/EN/DIN Conformity; Third-Party WitnessingAnd Factory Audits Supported

PRODUCTS

Seamless Stainless Steel TP314 Pipe
Seamless Stainless Steel TP314 Pipes (UNS S31400 / W.Nr. 1.4841) are premium high-alloy austenitic solutions specifically engineered for extreme thermal environments and superior oxidation resistance. As a premier manufacturer based in China, We produces high-integrity seamless piping that strictly adheres to ASTM A312 and ASME SA312 international standards. Distinguished by its high Silicon (Si) content, our TP314 (AISI 314) tubing develops a protective oxide layer that ensures exceptional stability at service temperatures up to 1150°C (2100°F). This makes them indispensable for mission-critical applications in radiant tubes, furnace components, and high-temperature petrochemical processing. Through advanced cold-drawing and precise solution annealing, XinZhe guarantees uniform microstructure and optimized creep strength, providing a reliable alternative to standard heat-resistant grades in aggressive thermal cycling conditions. "Our optimized chemical balance, specifically the high Si levels, provides superior resistance to carburizing atmospheres compared to TP310S."
Seamless Duplex Steel S31500 Tube
Seamless Duplex Steel S31500 Tubes (UNS S31500 / 3RE60) are high-performance piping solutions engineered with a balanced austenitic-ferritic dual-phase microstructure. Our S31500 duplex tubes are specifically designed to provide a strategic combination of high mechanical strength and exceptional resistance to chloride-induced stress corrosion cracking (SCC). With a yield strength nearly double that of conventional 300-series stainless steels, these tubes allow for thinner wall designs and increased pressure ratings in heat exchangers and chemical processing systems. Through advanced cold-drawing and precise solution annealing at our modern facilities, XinZhe ensures every tube maintains optimal phase balance and a high-integrity surface finish for the most demanding industrial environments. "Our S31500 tubes offer a PREN value that ensures long-term durability in brackish water and mildly corrosive chemical media."
Seamless Incoloy 825 Pipe
Seamless Incoloy 825 Pipes (UNS N08825 / W.Nr. 2.4858) are high-performance nickel-iron-chromium solutions engineered for exceptional resistance to both reducing and oxidizing acids. As a specialized manufacturer based in China, We produces premium seamless piping that strictly adheres to ASTM B423 and ASME SB423 international standards. Our Incoloy 825 pipes are stabilized with Titanium to inhibit intergranular corrosion and provide superior protection against chloride-ion stress corrosion cracking (SCC) and pitting in sulfuric and phosphoric acid environments. We offer a comprehensive size range from 1/2” to 12” NPS and wall thicknesses from SCH 10 to SCH 80. Through advanced cold-drawing and vacuum annealing, we ensures every pipe delivers the structural integrity required for chemical processing, pollution control, and offshore oil & gas applications.
Seamless Inconel 625 Tube
Inconel 625 Seamless Tube (UNS N06625 / EN 2.4856 / Alloy 625) is a high-strength, corrosion-resistant nickel-chromium-molybdenum alloy tube engineered for demanding high-temperature and aggressive service environments. Known for its exceptional resistance to pitting, crevice corrosion, oxidation, and chloride stress corrosion cracking, Inconel 625 offers outstanding mechanical strength and structural stability across a wide temperature range. XINZHE, a professional nickel alloy seamless tube manufacturer based in Wenzhou, China, specializes in the precision production of Inconel 625 seamless tubes using advanced hot extrusion and cold drawing processes. With extensive manufacturing experience and strict quality control systems, we supply Alloy 625 seamless tubing with consistent metallurgical properties, accurate dimensions, and reliable performance. Our Inconel 625 seamless tubes are available in a comprehensive range of outer diameters and wall thicknesses, with custom cut-to-length options and bulk supply capability to meet diverse industrial project requirements. All products are manufactured in accordance with international standards such as ASTM B444 and ASME SB444, ensuring compliance with global quality specifications.
OIL & GAS
The oil and gas value chain has three sectors: Upstream (exploration and production of oil and gas), Midstream (transportation and storage via pipelines and terminals), and Downstream (refining and processing into products like gasoline, lubricants, and petrochemicals).
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