Gxpipetech

Fujian Guangxin PipeTech Co., Ltd. specializes in the production of stainless steel seamless pipes, heat exchanger tubes, fittings, and flanges. Our products are distributed across major industrial regions in China and exported to Europe, the Middle East, Southeast Asia, and more, serving high-standard clients in energy, chemical, and equipment manufacturing sectors. https://www.gxpipetech.com/

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Inconel Seamless Tube China Manufacturer

INCONEL 718  Seamless Tube | Aerospace Precision

Inconel 718 seamless tube features age-hardened γ'' phase strengthening, delivering fatigue strength >825 MPa for rocket engine feed lines. Compliant with AMS 5596 and SGS material traceability. Explore our inconel 718 and 601 seamless tube for high-performance solutions in extreme environments.

Inconel Seamless Tube Specification

Technical Specifications

Seawater Velocity Limit

7 m/s (No erosion)

Electrical Resistivity

58 μΩ·cm

Cold Workability

85% reduction area

Cleanliness

Oil-free <0.1mg/m²

Features of Inconel Seamless Tube

Inconel 718 Seamless Tubes

Precipitation-Hardenable Chemistry:

Gamma-double prime (γ'') formation via 4.75-5.5% niobium with aluminum <0.8% and titanium <1.15%. Carbon restricted to 0.08% max to prevent MC carbides.

Aerospace Mechanicals:

Aged Strength: 1300 MPa UTS / 1100 MPa YS

Cryogenic Toughness: >100J @-196°C

Fatigue Strength: 825 MPa stress range @10⁷ cycles

Creep Life: 10,000h @650°C under 350 MPa

Precision Processing:

Triple-vacuum melting (VIM + VAR + ESR). Cold drawing with intermediate solution anneals. Aging heat treatment at 718°C. Fluorescent penetrant inspection (ASTM E1417).

Aviation/Aerospace Uses:

Turbine engine combustion liners (FAR 33.97)

Space launch vehicle propulsion ducts

Aircraft hydraulic actuation lines (AS4070)

Hypersonic vehicle thermal protection systems

Flight Certification:

AMS 5596 (Rev G) • AS9100 Rev D • ESA ECSS-Q-ST-70-71

Discover high-performance Inconel 718 Seamless Tubes from Guangxin PipeTech, ideal for aerospace applications with superior fatigue strength

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Inconel Seamless Pipe China Manufacturer

INCONEL 625 | Deep Sea Pressure Master

Solution-strengthened Ni-Cr pipes rated for 10,000m depth. Yield strength >700 MPa at 4K temperature. Subsea Christmas tree components approved.

Inconel Seamless Pipe Specification

Technical Specifications

Yield Strength

1100 MPa (Aged)

Fatigue Limit

825 MPa @10⁷ cycles

Heat Treatment

720°C×8h + 620°C×8h

NDT Level

UT Level B per AMS 2631

Features of Inconel Seamless Pipe

Inconel 625 Seamless Tubes

High-Temperature Chemistry:

Fe/Ni-based alloy strengthened by niobium-tantalum complex (Nb+Ta: 3.15-4.15%). Aluminum/titanium limitation (<0.40%) prevents gamma-prime formation. Chromium (20-23%) develops self-repairing Cr₂O₃ layers at extreme temperatures.

Mechanical Performance Profile:

Creep Rupture: 180 MPa @815°C for 10,000h

Cyclic Oxidation: <0.05 mg/cm² mass loss @980°C (ASTM G54)

Cryogenic Toughness: 120J Charpy impact @-196°C

Fatigue Strength: 550 MPa @10⁷ cycles (R=0.1)

Aerospace Manufacturing:

Cold pilgering achieves wall thickness tolerances of ±5%. Solution annealing at 1150°C under argon cover gas. Continuous eddy current testing detects flaws >0.125mm deep per AMS 2631B.

Demanding Use Cases:

Rocket engine combustion chambers (NASA-STD-5008)

Nuclear fuel cladding in PWR reactors (ASME Sec III)

Deep-sea MPD (managed pressure drilling) systems

Plasma etching chambers in semiconductor fabs

Aerospace Approvals:

AMS 5599 • ESA PSS-01-702 • NADCAP AC7114/1

Discover high-performance Inconel 625 Seamless Pipes from Guangxin PipeTech, engineered for extreme deep-sea and high-temperature applicatio

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Incoloy Seamless Pipe China Manufacturer

INCOLOY 825 Seamless Pipe | Sulfur Compound Solution

Incoloy seamless pipe with 42% Fe-Ni-Cr composition combats sulfuric acid stress cracking. Features Ti-stabilized design for refinery burner pipes handling 550°C exhaust gases. Discover our incoloy 825 seamless pipe options for reliable performance.

Incoloy Seamless Pipe Specification

Technical Specifications

Sulfuric Acid Resistance

Up to 40% @65°C

Heat Treatment

Annealed at 980°C

Weldability

ENiCrMo-3 filler

PMI Testing

XRF on every pipe

Package

Nitrogen purged

Features of Incoloy Seamless Pipe

Incoloy 825 Seamless Pipes

Sulfuric Acid Chemistry:

INCOLOY 825 (UNS N08825) contains 38-46% nickel with copper addition (1.5-3.0%) for sulfuric acid resistance. Titanium stabilization (0.6-1.2%) prevents sensitization.

High-Temp Mechanicals:

Stress Rupture: 100 MPa @700°C/10,000h

Yield Strength Retention: 220 MPa @550°C

Oxidation Rate: <0.5 mg/cm²/100h @900°C

Thermal Fatigue: 300+ cycles (20-800°C)

Refinery Manufacturing:

Continuous extrusion with multi-stage cold drawing. Solution annealing at 980°C. 100% rotary ultrasonic testing to ASTM E213 Level B.

Petrochemical Uses:

Coke drum quenching systems

Hydrotreater charge heater coils

Sour water stripper reboilers

Sulfur recovery unit condensers

Refinery Standards:

API 934-C • NACE TM0177-2016 • SHELL MESC SPE 87/102

Guangxin PipeTech produces precision Incoloy 825 and 800HT seamless pipes. Corrosion-resistant, high-strength pipes for petrochemical and re

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Duplex Stainless Steel Tube China Supplier

SAF 2507 | Chloride Resistance Champion

Superior stress corrosion cracking resistance in seawater cooling systems. DNV-GL approved for subsea applications, with 35% higher thermal conductivity than standard duplex grades. Guangxin PipeTech, a trusted duplex stainless steel tube supplier in China, supplies duplex 2205 tube with superior corrosion resistance for oil & gas applications. Buy duplex stainless steel tube at competitive prices from us.

Duplex Stainless Steel Seamless Tube Specification

Technical Specifications

PREN Formula

%Cr+3.3%Mo+16%N≥43

Critical Pitting Temp

85°C in FeCl₃

Hardness

290 HB max

Thermal Conductivity

19 W/m·K @100°C

Package

VCI paper wrapped

Guangxin PipeTech’s duplex stainless steel tube, including duplex 2205 tube, excels in cryogenic LNG systems (-165°C), offering PREN≥35, NORSOK-certified. Buy duplex stainless steel tube for offshore projects.

Features of Duplex Stainless Steel Seamless Tube

Super Duplex S32750 Tubes

Hyper-Duplex Chemistry:

UNS S32750 requires PREN ≥43 (%Cr + 3.3x%Mo + 16x%N). Controlled manganese <1.2% prevents Z-phase formation. Nickel maintained at 6-8% for optimal phase balance.

Mechanical Robustness:

Proof Strength: >550 MPa @20°C

H₂S Tolerance: NACE TM0177 Method A at 25 psi

CTE: 12.5 µm/m°C (20-300°C)

Critical Pitting Temp: 85°C per ASTM G48 Method D

Marine-Grade Production:

Forged billets undergo solution annealing at 1080°C with rapid water quenching. ASTM E562 phase balance verification. Hydrogen bake-out at 200°C prevents HIC (hydrogen-induced cracking).

Saltwater Applications:

SWRO (seawater reverse osmosis) pressure vessels

Offshore seawater injection systems

Shipboard desalination plants

Ballast water treatment heat exchangers

Marine Certifications:

DNV-GL OS F101 • NORSOK M630 • ASTM A269

Guangxin PipeTech offers precision duplex 2205 and SAF 2507 stainless steel seamless tubes. Corrosion-resistant, high-strength tubing for ma

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Duplex Stainless Steel Seamless Pipe China Manufacturer

UNS S32205 | For Extreme Environments

22% Cr, 5% Ni duplex pipes delivering 2x yield strength vs 316L. Perfect for offshore risers handling H₂S-containing media (-30°C to 250°C). Pitting Resistance Equivalent >40. Buy duplex stainless steel pipe from China manufacturer Guangxin PipeTech. Duplex 2507 pipe with H₂S resistance for oil & gas. Get competitive prices!

Duplex Stainless Steel Pipe Classifications and Applications

By Material

Austenitic Stainless Steel: 304, 316L, 321, 317L

Duplex Stainless Steel: 2205, 2507

Nickel Alloys: Monel 400, Inconel 600/625, Incoloy 825, Hastelloy C-276, etc.

By Pipe Shape & End Type

Round Seamless Pipes (most common)

Square and Rectangular Seamless Tubes (available upon request)

Plain End (PE), Beveled End (BE), or Threaded End (TE)

By Size Range

Outer Diameter (OD): from 6mm to 630mm

Wall Thickness: from 0.5mm to 50mm

Length: fixed length or random length (up to 12 meters or as per customer specification)

By Application

Application Area Typical Material Key Features

Chemical & Petrochemical 316L, 317L, Alloy 825 Acid and corrosion resistance

Marine & Offshore 2205, 2507, Alloy 625 Chloride resistance and high strength

Power & Heat Exchangers 321, Inconel 600 Thermal stability and pressure resistance

Oil & Gas (Sour Service) Alloy 400, Alloy 825 Resistance to H₂S and CO₂ environments

Pharmaceutical & Sanitary 304L, 316L Clean surfaces and hygienic performance

Duplex Stainless Steel Seamless Pipe Specification

Technical Specifications

PREN Value

≥35

Phase Balance

Ferrite 40-55%

Impact Toughness

100J @ -46°C

Chloride Resistance

≤15,000ppm @80°C

Certification

NORSOK M-630

Guangxin PipeTech’s duplex stainless steel pipe, including duplex 2507 pipe, offers PREN≥35, ideal for duplex stainless steel pipe applications in LNG cryogenic systems (-165°C). Buy duplex seamless pipe with NORSOK M-630 certification for offshore projects at competitive duplex pipe prices.

Features of Duplex Stainless Steel Seamless Pipe

Duplex UNS S32205 Seamless Pipes

Phase-Balanced Chemistry:

UNS S32205 (22Cr-5Ni-3Mo-0.15N) requires ferrite-austenite phase equilibrium (40-55% ferrite) per ASTM A182. The PREN (Pitting Resistance Equivalent Number) exceeds 35, calculated as %Cr + 3.3x%Mo + 16x%N. Critical copper impurity is controlled at <0.5% to avoid sigma phase precipitation.

Mechanical Superiority:

Yield Strength: 450-550 MPa (2x 316L)

Fatigue Endurance: 380 MPa at 10⁶ cycles (DNV-OS-F101)

Thermal Conductivity: 15 W/m·K @100°C (25% higher than 316L)

CTE: 13 µm/m°C (20-100°C) avoiding thermal stress cracking

Offshore-Grade Production:

Billets solution-treated at 1080°C with accelerated water quenching achieves ASTM grain size 7-8. Automatic ultrasonic testing detects imperfections >5% wall thickness. Hardness is maintained at 250-290 HV30 to meet NACE standards.

Oil & Gas Applications:

Subsea Christmas tree components (API 6A specification)

Seawater-cooled heat exchangers handling H₂S at 50 ppm

Geothermal brine injection systems at 150°C

LNG cryogenic transfer pipes (-165°C service)

Certification Suite:

NORSOK M650-S1 • ASTM A790 • ISO 15156-3 (Material Class 3c)

Guangxin PipeTech produces precision duplex 2205 and 2507 stainless steel seamless pipes. High-strength, corrosion-resistant pipes for offsh

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Butt Welded Fittings China Manufacturer

As a professional manufacturer of stainless steel/nickel alloy butt-weld fittings‌, we produce ASME/GB-compliant elbows, tees, reducers, and caps. Utilizing premium materials combined with CNC machining and automated welding, we ensure dimensional precision and uniform weld integrity. All products undergo 100% radiographic testing and hydrostatic pressure tests, backed by complete material certifications. We offer tailored solutions in grades (304/316L, Hastelloy, Monel®), sizes, and pressure ratings for demanding applications in petroleum, chemical, and nuclear industries.

Types of Butt Welded Fittings

Butt-Welding Elbows and Returns

Butt-Welding Straight Tees and Crosses

Butt-Welding Reducing Outlet Tees and Reducing Outlet Crosses

Butt-Welding Concentric & Eccentric Reducers

Butt-Welding Caps

Butt Welded Fittings

Advantages of Using Butt Weld Fittings

Butt weld fittings offer a permanent, leak-proof connection with excellent strength. Their smooth inner surface reduces pressure loss and turbulence, making them ideal for high-pressure and high-temperature applications. They also support better flow efficiency and allow for easy inspection, cleaning, and modification of piping systems.

Butt Weld Fittings vs Socket Weld Fittings

Butt weld fittings are welded directly to pipe ends, providing a stronger, more seamless connection with improved flow characteristics. In contrast, socket weld fittings use a socket for insertion and fillet welding, making them easier to install but less suitable for larger pipe sizes or high-stress systems. Butt welds are preferred for critical pipelines requiring structural integrity and corrosion resistance.

Common Applications of Butt Welded Fittings

Butt welded fittings are widely used in industries such as oil & gas, power generation, chemical processing, shipbuilding, and water treatment. They are ideal for transporting fluids under high pressure or temperature, and are commonly found in pipelines, heat exchangers, pressure vessels, and refineries.

Guangxin PipeTech offers butt welded fittings including ASME-compliant elbows, tees, reducers, and caps in stainless steel, duplex, and high

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Nuclear Control Rod Tubes

Our tubes play a critical role in the field of nuclear control rod tubes. As essential components for controlling the nuclear fission reaction in reactors, control rod tubes require materials with stringent high-temperature resistance, radiation resistance, corrosion resistance, and mechanical strength.

We supply high-performance stainless steel and nickel-based alloy tubes, such as TP316L, Inconel 600, and Inconel 718, which offer excellent radiation resistance and long-term stability, ensuring structural integrity and reliable functionality under the harsh conditions inside nuclear reactors. With precise dimensional control and superior material properties, our tubes provide safe and durable solutions for the nuclear industry.

Our tubes are available in sizes ranging from 1.0 inch (25.4mm) outside diameter down to 0.25 inch (6.35mm) outside diameter, with custom sizes available upon request.

Popular Guangxin PipeTech Pipings, Fittings and Flanges

Butt-Welding Caps

Inconel Seamless Pipe

Butt-Welding Concentric & Eccentric Reducers

Guangxin PipeTech offers high-performance TP316L and Inconel 600/718 nuclear control rod tubes. Offering radiation and corrosion resistance,

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Aerospace Engine Tubes

Our stainless steel and nickel alloy tubes play a critical role in aerospace engine tubing applications. Aerospace engines demand exceptionally high-performance tubing with features such as high-temperature strength, corrosion resistance, fatigue resistance, and lightweight construction. We supply materials such as TP316L stainless steel, Inconel 625, and Inconel 718, which are widely used in key engine components including fuel delivery systems, lubrication circuits, and high-temperature gas lines, ensuring stable performance under extreme operating conditions.

Our aerospace-grade tubes offer precise dimensions, clean internal and external surfaces, and excellent formability for precision bending and welding, meeting the stringent standards of the aerospace industry. They are well-suited for complex applications in commercial aircraft, military jet engines, and space propulsion systems, providing safe and reliable solutions for demanding environments.

Popular Guangxin PipeTech Pipings, Fittings and Flanges

Integral Flange

Socket Weld Flange

Nickel Alloy Seamless Tube

Guangxin PipeTech offers high-performance aerospace stainless steel tubing for engines. Our TP316L and Inconel 625/718 tubes offer corrosion