Inconel Pipes Grades 600 / 625 / 718 / 725 / 800 / 800H Manufacturer, Supplier, Distributor, Wholesaler & Exporter in India – Mcneil Instrument
Inconel pipes are nickel-based alloy pipes built to withstand extreme heat, high pressure, and severe corrosion. They’re used in demanding industries like oil & gas, power plants, chemical processing, and aerospace where standard steel pipes can’t survive.
Inconel 600, 625, 718, 725, 800, 800H Pipes
Here’s the thing. When operating temperatures climb, corrosion becomes aggressive, and mechanical loads stay constant for years, conventional alloy steel pipes reach their limit. This is exactly where Inconel pipes step in.
Mcneil Instruments manufactures and supplies high-performance Inconel nickel alloy pipes engineered for extreme heat, pressure, oxidation, and corrosive media. These pipes are widely used in power generation, oil & gas, chemical processing, aerospace, and offshore applications where failure is not an option.
Our Inconel pipe range strictly follows ASTM, ASME, and UNS standards, ensuring consistency, traceability, and long service life across critical systems.
What Makes Inconel Pipes Different
Inconel is a nickel-chromium-based superalloy strengthened through solid solution and precipitation hardening. Unlike stainless or alloy steels, Inconel maintains:
- High tensile strength at elevated temperatures
• Outstanding oxidation and carburization resistance
• Excellent resistance to chloride stress corrosion cracking
• Structural stability under cyclic thermal loads
This combination makes Inconel pipes ideal for environments where temperature exceeds 600°C and corrosive exposure is continuous.
Inconel Pipe Grades We Offer
We supply six carefully selected Inconel grades, covering most industrial and energy-sector requirements.
Inconel 600 Pipes
Inconel 625 Pipes
Inconel 718 Pipes
Inconel 725 Pipes
Inconel 800 Pipes
Inconel 800H Pipes
Inconel 600 Pipes
UNS N06600 | ASTM B167 / B829
Inconel 600 is a solid-solution strengthened nickel-chromium alloy known for excellent oxidation resistance and stability across a wide temperature range.
Key characteristics
• Good resistance to oxidation up to 1093°C
• Excellent resistance to caustic corrosion
• Non-magnetic and easily fabricated
Common applications
• Heat exchangers
• Chemical processing equipment
• Furnace components
Inconel 625 Pipes
UNS N06625 | ASTM B444 / B829
Inconel 625 is strengthened by molybdenum and niobium, delivering exceptional strength without heat treatment.
Key characteristics
• Outstanding fatigue and thermal fatigue strength
• Excellent resistance to pitting and crevice corrosion
• Superior weldability
Common applications
• Offshore oil & gas piping
• Chemical reactors
• Aerospace fluid systems
Inconel 718 Pipes
UNS N07718 | ASTM B637
Inconel 718 is a precipitation-hardened alloy offering extremely high tensile and creep strength at elevated temperatures.
Key characteristics
• High yield strength up to 700°C
• Excellent creep rupture resistance
• Exceptional fatigue performance
Common applications
• Gas turbine components
• High-pressure piping systems
• Aerospace structures
Inconel 725 Pipes
UNS N07725 | ASTM B829
Inconel 725 combines corrosion resistance similar to 625 with higher mechanical strength after age hardening.
Key characteristics
• Superior resistance to sulfide stress cracking
• Excellent pitting and crevice corrosion resistance
• High strength in sour environments
Common applications
• Downhole oil & gas piping
• Marine fasteners and piping
• High-pressure offshore systems
Inconel 800 Pipes
UNS N08800 | ASTM B407
Inconel 800 is an iron-nickel-chromium alloy designed for high-temperature structural stability.
Key characteristics
• Good strength at elevated temperatures
• Excellent resistance to oxidation and carburization
• Stable microstructure
Common applications
• Heat exchangers
• Furnace tubes
• Petrochemical piping
Inconel 800H Pipes
UNS N08810 | ASTM B407
Inconel 800H is a controlled carbon version of 800, optimized for improved creep strength.
Key characteristics
• Enhanced rupture strength
• Excellent thermal stability
• Long service life in continuous heat exposure
Common applications
• Superheater and reheater tubing
• Power plant piping
• High-temperature pressure vessels
Technical Specifications – Inconel Pipes
Manufacturing Standards
- ASTM B167, B444, B407, B637
• ASME SB specifications
• Seamless & welded construction
Size Range
- OD: 6 mm to 610 mm
• Wall Thickness: SCH 5S to SCH XXS
• Length: Random, fixed, or cut-to-length
Chemical Composition (Typical %)
| Grade | Ni | Cr | Mo | Fe | Nb | Ti |
| 600 | ≥72 | 14–17 | — | 6–10 | — | — |
| 625 | ≥58 | 20–23 | 8–10 | ≤5 | 3–4 | — |
| 718 | 50–55 | 17–21 | 2.8–3.3 | ≤18 | 4.8–5.5 | 0.65–1.15 |
| 725 | 55–59 | 19–22 | 7–9 | ≤5 | 3–4 | — |
| 800 | 30–35 | 19–23 | — | Balance | — | — |
| 800H | 30–35 | 19–23 | — | Balance | — | — |
Mechanical Properties (Typical)
| Grade | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) |
| 600 | ≥550 | ≥240 | ≥30 |
| 625 | ≥827 | ≥414 | ≥30 |
| 718 | ≥1240 | ≥1030 | ≥12 |
| 725 | ≥860 | ≥550 | ≥20 |
| 800 | ≥500 | ≥210 | ≥30 |
| 800H | ≥520 | ≥230 | ≥30 |
Inconel Pipe Weight Chart (Approx.)
Weight per meter (kg) – Seamless Pipes
| OD (mm) | WT 3 mm | WT 5 mm | WT 8 mm |
| 25 | 1.8 | 2.7 | 4.1 |
| 50 | 3.7 | 5.6 | 8.6 |
| 100 | 7.5 | 11.4 | 17.5 |
| 150 | 11.4 | 17.3 | 26.6 |
Note: Weights are indicative and vary by grade and standard.
Heat Treatment & Testing
- Solution annealing
• Age hardening (where applicable)
• Hydrostatic testing
• Eddy current & ultrasonic testing
• PMI and chemical analysis
Industries Using Inconel Pipes
- Power generation
• Oil & gas (onshore and offshore)
• Chemical & petrochemical plants
• Aerospace and defense
• Marine and desalination systems
Why Choose Mcneil Instruments
- ISO-certified manufacturing
• Strict ASTM & ASME compliance
• Deep technical support for material selection
• Large ready stock & fast dispatch
• Global export capability
Call to Action
Looking for a reliable Inconel pipe manufacturer in India or need help selecting the right Inconel grade for high-temperature or corrosive service?
Connect with Mcneil Instruments for technical guidance, competitive pricing, and assured quality delivery.
FAQs
Which Inconel grade is best for offshore oil & gas?
Inconel 625 and 725 are preferred due to superior resistance to chloride and sulfide stress corrosio
Can Inconel pipes handle continuous high temperatures?
Yes. Grades like 600, 800, and 800H are designed for long-term exposure above 600°C.
Are Inconel pipes weldable?
All offered grades are weldable using appropriate filler metals and procedures.
Difference between Inconel 800 and 800H?
800H has controlled carbon content, providing improved creep and rupture strength.
Do you supply custom lengths and schedules?
Yes. Pipes can be supplied in custom lengths, wall thicknesses, and schedules as per project needs.