The main advantage of using an Inconel seamless pipe over a welded one is the absence of a weld seam that offers significantly higher mechanical strength and reliability under high pressure and temperature. Welded pipes may have weak points at the seam.
Inconel Seamless Pipe Manufacturer in China
We are Zhejiang Xintongda Special Steel (XTD) and we operate as a leading manufacturer in China and a global supplier of Inconel seamless pipes. A seamless Inconel pipe is a superalloy composed mainly of nickel and chromium made without a weld seam. This ensures that the structure stays strong even under extreme pressure. Our pipes meet the strict standards set by ASTM B167 (for Inconel 600/601), ASTM B444 (for Inconel 625), ASTM B983 (for Inconel 718), ASME, DIN, and JIS. We make this high-quality seamless pipe using advanced extrusion and cold drawing manufacturing technology. Each pipe is made from high-quality nickel alloy, which makes it very resistant to corrosion, strong at high temperatures and able to handle tough conditions. We provide Inconel pipe in different grades, such as 600, 601, 625, and 718. It comes in different sizes to fit the needs of diverse industries. We perform strict quality checks at every step, from sourcing the materials to testing the final product. Our clients also benefit from professional technical support and guidance when choosing custom Inconel pipes. Contact us directly for competitive pricing and quick delivery of Inconel seamless pipes.
Our Inconel pipes meet the following specifications:
-
OD Range
6-457 mm
-
Thickness
1-65 mm
-
Length
≤ 18 m
Get a free quote now
What is an Inconel Seamless Pipe?
An Inconel Pipe is a high-performance pipe made from a nickel-chromium-based superalloy. A seamless pipe is extruded or drawn from a solid metal billet. This process eliminates the longitudinal weld seam, which is traditionally the weakest point prone to leaks and localised corrosion. This pipe is designed to handle extreme pressure and corrosive chemical exposure while maintaining structural integrity at a high maximum operating temperature. The high amount of nickel in this pipe makes it resistant to oxidation and corrosion and provides thermal stability. It forms a stable, adherent, passivating oxide layer that protects the surface while keeping the tensile and creep-rupture strength high at temperatures. It also provides excellent protection against pitting and stress-corrosion cracking that is caused by chloride ions. This makes it suitable for the aerospace, marine engineering, and chemical processing fields.
| Grade | Also Known As | Max Operating Temp | Corrosion Resistance Profile |
| Inconel 600 | Nickel-Chromium-Iron (Ni-Cr-Fe) alloy | 1095°C (2000°F) | Offers good to excellent resistance to organic acids and alkalines, though it is not suitable for hydrochloric or nitric acid environments. |
| Inconel 601 | Nickel-Chromium-Aluminium (Ni-Cr-Al) alloy | 1250°C (2280°F) | Highly effective at resisting high-temperature oxidation and provides acceptable to good performance in alkaline and salt environments. |
| Inconel 625 | Nickel-Chromium-Molybdenum (Ni-Cr-Mo) alloy | 980°C (1800°F) | Demonstrates excellent resistance across nearly all categories, including sulfuric, hydrochloric, and phosphoric acids, as well as seawater. |
| Inconel 718 | Nickel-Chromium-Iron-Niobium (Ni-Cr-Fe-Nb) alloy | 700°C (1300°F) | Provides good to excellent resistance to seawater and organic acids, with acceptable performance in phosphoric acid and alkalines. |
While all listed alloys are fundamentally resistant to chloride cracking, the specific "Ni-Cr" compositions determine their niche. For instance the molybdenum (8.00-10.00%) in Inconel 625 (Ni-Cr-Mo) provides a comprehensive shield against aggressive acids like sulfuric and hydrochloric. This makes it the most versatile for aqueous corrosion. In contrast the aluminium (1.00-1.70%) in Inconel 601 focuses on extreme thermal stability up to 1250°C. Inconel 600 and Inconel 718 serve as specialised solutions for alkaline processing and high-strength mechanical applications in marine settings.
Range of Inconel Grades for Seamless Pipes
We provide various grades of Inconel seamless pipes, including 600, 601, 625, and 718. Each grade differs in chemical composition, characteristics, applicable standards, and target applications.
01
Inconel 600
Inconel 600 seamless pipe is an alloy of nickel, chromium and iron that is very resistant to oxidation and stays stable at temperatures up to 1095°C (2000°F). It works well in environments with alkaline and organic acids. This makes it suitable for chemical processing and heat treatment.
02
Inconel 601
Inconel 601 seamless pipe is a nickel-chromium-aluminium alloy engineered for superior high-temperature oxidation resistance up to 1250°C (2280°F). The aluminium content (1.0-1.7%) forms a protective oxide layer that resists scaling in thermal processing environments.
03
Inconel 625
Inconel 625 seamless pipe is a nickel-chromium-molybdenum alloy offering exceptional resistance to pitting, crevice corrosion, and aggressive acids including sulfuric, hydrochloric, and phosphoric. The molybdenum content (8.0-10.0%) makes it the most versatile grade for seawater and harsh chemical environments.
04
Inconel 718
Inconel 718 seamless pipe is a precipitation-hardenable nickel-chromium alloy with niobium additions that deliver exceptional mechanical strength up to 700°C (1300°F). It combines high tensile strength with good corrosion resistance, making it the preferred choice for aerospace turbine components and high-stress marine applications.
Inconel Grade Comparison Table
| Grade | Also Known As | Max Operating Temp | Corrosion Resistance Profile |
| Inconel 600 | Nickel-Chromium-Iron (Ni-Cr-Fe) alloy | 1095°C (2000°F) | Good to excellent resistance to organic acids and alkalines; not recommended for concentrated hydrochloric or nitric acid. |
| Inconel 601 | Nickel-Chromium-Aluminium (Ni-Cr-Al) alloy | 1250°C (2280°F) | Highly effective at resisting high-temperature oxidation; acceptable to good in alkaline and salt environments. |
| Inconel 625 | Nickel-Chromium-Molybdenum (Ni-Cr-Mo) alloy | 980°C (1800°F) | Excellent resistance to sulfuric, hydrochloric, and phosphoric acids, as well as seawater. |
| Inconel 718 | Nickel-Chromium-Iron-Niobium (Ni-Cr-Fe-Nb) alloy | 700°C (1300°F) | Good to excellent resistance to seawater and organic acids; acceptable in phosphoric acid and alkalines. |
Why Choose Inconel Seamless Pipe?
These are the 6 reasons why you should choose Inconel seamless pipes:
- High-Temperature Performance: Inconel pipes stay strong and keep their shape even at elevated temperatures. The alloy forms a stable, adherent oxide layer that prevents degradation under sustained thermal exposure.
- Superior Corrosion Resistance: This pipe resists corrosion in harsh acids and seawater environments. It is used because the nickel base creates a natural shield against chemical attacks.
- No Weld Weakness: Manufactured from a single solid billet, our pipes contain no seams or weld lines. This eliminates the most common failure point under high-pressure service.
- Reliability in Extreme Environments: Inconel pipe works well in both freezing cold and intense heat environments without becoming brittle. The alloy resists thermal shock and cracking during rapid temperature or environmental changes.
- Superior Integrity: The seamless design ensures that the pipe has a uniform wall thickness and strength throughout. This consistency eliminates localised weak points that could lead to leaks or premature failure.
- High Strength & Durability: Inconel alloys offer significantly higher strength than standard austenitic stainless steels and can carry heavy loads. It provides a long service life in high-stress situations, reducing the need for frequent repairs.
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
What Industries Commonly use Inconel Seamless Pipes?
These are the 8 industries that use Inconel seamless pipes:
Aerospace Industry
This pipe is used in jet engines and exhaust systems where temperatures are extremely high. It carries fuel and and exhaust gases at sustained elevated temperatures without deformation in aerospace propulsion systems.
Oil and Gas
This Inconel pipe is used deep underground to transport sour crude oil that contains corrosive gases. It prevents leaks in high-pressure wells where standard steel would quickly corrode.
Chemical Processing
Chemical plants use Inconel pipes to move aggressive acids and hazardous chemicals through their systems. The pipes resist chemical attack, preventing corrosion-related failures in critical process piping.
Power Generation
Inconel seamless pipe is used in superheater tubing inside massive boilers to handle high-pressure steam. It allows power plants to operate at higher temperatures. This makes electricity production more efficient.
Marine and Offshore
Shipbuilders use these pipes for equipment that stays submerged in or near salt water. The pipes resist pitting corrosion and chloride attack in submerged and splash-zone marine applications.
Petrochemical & Refining
Refineries use this pipe in distillation units to process raw oil into gasoline and other fuels. It is necessary because it can handle the constant heat and sulfur found in crude oil.
Nuclear Industry
Inconel pipe is used in the cooling systems of nuclear reactors to move radioactive water. It provides a high level of safety because it can withstand both radiation and elevated temperatures without loss of structural integrity.
Heat Treating
Commercial furnaces use Inconel pipes as rollers or internal components to move parts through the heat. Our Inconel pipes withstand sustained furnace temperatures while supporting heavy loads during continuous heat treatment cycles.
Frequently Asked Questions
-
What is the main advantage of using an Inconel seamless pipe over a welded one?
-
Can I get custom sizes of Inconel seamless pipe from China manufacturers?Yes. We, XTD, can offer custom sizes of Inconel seamless pipes for production orders within 15-60 days. We are a leading manufacturer of these pipes in China and have been serving industries around the world since 1985.
-
Are Inconel seamless pipes suitable for hydrogen service?Yes, Inconel seamless pipes resist hydrogen embrittlement and work well in hydrogen service due to their nickel-chromium alloy. They suit high-temperature hydrogen environments.