What Is a Seamless Inconel 600 Pipe?
On this page:Overview · Standards · Key Advantages · Specifications · Applications
Nickel Alloy Inconel 600 (UNS N06600) is a high-performance, corrosion-resistant material engineered for extreme environments. A Seamless Inconel 600 Pipe is manufactured through a hot extrusion or cold drawing process from a single, solid billet. Unlike welded pipes, seamless manufacture eliminates the longitudinal manufacturing weld seam. Pressure capability and service life still depend on dimensions and tolerances, material condition, inspection acceptance criteria, the design code and operating conditions.
Technical Specifications & Standards
To ensure global compliance and quality, our Inconel 600 seamless pipes are manufactured according to international standards:
- ASTM B167 / ASME SB167: Standard specification for Nickel-Chromium-Iron alloys seamless pipe and tube.
- ASTM B829: General requirements for Nickel and Nickel Alloy seamless pipe.
- UNS N06600 / W.Nr. 2.4816: Common technical designations.
Key Features and Advantages
Exceptional Corrosion and Oxidation Resistance
Inconel 600 provides excellent resistance to chloride-ion stress-corrosion cracking (SCC). Its high nickel content (72% min) gives good resistance to chloride SCC in many environments (not immunity — verify against the actual service environment), while its chromium content provides resistance to sulfur compounds and various oxidizing environments.
High-Temperature Stability (Up to 2000°F)
This superalloy maintains high tensile strength and creep-rupture properties at elevated temperatures. It remains stable and resistant to scaling in temperatures reaching 2000°F (1093°C), making it ideal for thermal processing.
Superior Pressure Tolerance
The seamless construction eliminates the”heat-affected zone”found in welded pipes. Actual pressure capacity must be calculated under the applicable design code using the specified dimensions and material condition.
Excellent Mechanical Properties
- Non-Magnetic: Ideal for specialized electronic and sensitive instrument applications.
- Workability: Despite its high strength, Inconel 600 offers good fabricability and can be readily machined and welded using standard industrial methods.
Product Specifications and Data
To provide a comprehensive overview of this high-performance material, here are the detailed technical specifications and performance data for Inconel 600.
Equivalent Grade
| UNS | Common grade name | EN material number | EN steel name | JIS grade | GB/T grade |
|---|---|---|---|---|---|
| N06600 | Inconel 600 | 2.4816 | NiCr15Fe | NCF600 | NS3102 / NS312 (legacy) |
Grade correspondence does not make ASTM, ASME, EN, JIS and GB delivery requirements interchangeable. Confirm chemistry, heat treatment, mechanical properties, dimensions, testing and certification against the purchase specification. See the grade designation index.
Chemical Composition
The composition of Inconel 600 is carefully balanced to achieve its superior corrosion resistance and high strength.
| Ni | Cr | Fe | Mn | C | Cu | Si | S |
|---|---|---|---|---|---|---|---|
| ≥ 72.00 | 14.00 – 17.00 | 6.00 – 10.00 | ≤ 1.00 | ≤ 0.15 | ≤ 0.50 | ≤ 0.50 | ≤ 0.015 |
Source: ASTM B167-23, Table 1 (chemical requirements, UNS N06600). Single values are maximum content unless a range or minimum is shown. Iron is determined arithmetically by difference.
Mechanical Properties (Specification Limits)
Inconel 600 is specifically designed to maintain its strength and shape in high-stress, high-temperature environments.
| Material and Condition | Tensile Strength, min | Yield Strength (0.2% offset), min | Elongation in 50 mm (2 in.), min |
|---|---|---|---|
| Hot-worked or hot-worked annealed, OD ≤ 127 mm (5 in.) | 550 MPa (80 ksi) | 205 MPa (30 ksi) | 35 % |
| Hot-worked or hot-worked annealed, OD > 127 mm (5 in.) | 515 MPa (75 ksi) | 170 MPa (25 ksi) | 35 % |
| Cold-worked annealed, OD ≤ 127 mm (5 in.) | 550 MPa (80 ksi) | 240 MPa (35 ksi) | 30 % |
| Cold-worked annealed, OD > 127 mm (5 in.) | 550 MPa (80 ksi) | 205 MPa (30 ksi) | 35 % |
Source: ASTM B167-23, Table 2 — UNS N06600 seamless pipe and tube. Values are room-temperature minimums and depend on product condition and outside diameter, so the governing row must be stated on the purchase order. Alloy 600 heat-exchanger tube is a different product covered by ASTM B163-22, Table 3 (annealed: 552 MPa / 241 MPa / 30%) — tube values must not be applied to pipe. Tension testing per ASTM E8/E8M.
Physical Properties (Reference)
These physical properties highlight the material’s ability to perform reliably under a wide range of conditions.
| Density | Melting Point | Thermal Expansion | Thermal Conductivity | Modulus of Elasticity | Electrical Resistivity |
|---|---|---|---|---|---|
| 8.47 g/cm³ | 1354–1413 °C | 13.0 µm/m·°C (20–100°C) | 14.9 W/m·K (20°C) | 207 GPa | 1.03 × 10−6 Ω·m (20°C) |
Size Tolerance Chart (mm)
Cold-Finished Pipes and Tubes:
| Specified/Calculated Nominal OD (Inches) | Permissible Variation (Inches) | Specified/Calculated Nominal OD (mm) | Permissible Variation (mm) |
|---|---|---|---|
| 0.500 to 5⁄8, excl. | ±0.005 | 12.7 to 15.8, excl. | ±0.127 |
| 5⁄8 to 1 1⁄2, incl. | ±0.0075 | 15.8 to 38.1, incl. | ±0.190 |
| Over 1 1⁄2 to 3 1⁄2, incl. | ±0.010 | Over 38.1 to 88.9, incl. | ±0.254 |
| Over 3 1⁄2 to 4 1⁄2, incl. | ±0.015 | Over 88.9 to 114.3, incl. | ±0.381 |
| Over 4 1⁄2 to 6, incl. | ±0.020 | Over 114.3 to 152.4, incl. | ±0.508 |
| Over 6 to 6 5⁄8, incl. | ±0.025 | Over 152.4 to 168.3, incl. | ±0.635 |
| Specified/Calculated Nominal OD (Inches) | Permissible Variation (Inches) | Specified/Calculated Nominal OD (mm) | Permissible Variation (mm) |
|---|---|---|---|
| 2 1⁄2 to 5 1⁄2, excl. | ±0.031 | 63.5 to 139.7, excl. | ±0.787 |
| 5 1⁄2 to 9 1⁄4, incl. | ±0.047 | 139.7 to 234.9, incl. | ±1.19 |
| Condition | Specified/Calculated Nominal OD (Inches) | Permissible Variation (Wall Thickness) |
|---|---|---|
| Cold-Finished | 0.500 to 5⁄8, excl. | ±15.0% |
| 5⁄8 to 4 1⁄2, incl. | ±10.0% | |
| Over 4 1⁄2 to 6 5⁄8, incl. | ±12.5% | |
| Hot-Finished | 2 1⁄2 to 9 1⁄4, incl. | ±12.5% |
Common Industrial Applications
The unique metallurgical profile of Inconel 600 seamless pipes makes them indispensable in:
Chemical & Petrochemical
Heater coils, bubble towers, and condensers for handling fatty acids or magnesium chloride.
Nuclear Engineering
Steam generator tubing, control rod inlet components, and reactor vessel seals.
Aerospace & Defense
Jet engine exhaust liners, turbine seals, and airframe components.
Heat Treating
Muffles, retorts, and furnace conveyor belts that undergo repeated thermal cycling.
Why Specify Seamless Over Welded?
For critical infrastructure, seamless Inconel 600 pipe offers:
- No longitudinal production weld: the as-supplied pipe has no weld seam or weld heat-affected zone; field butt welds remain possible and must be qualified separately.
- Dimensional control: OD and wall tolerances follow ASTM B829 and the ordered specification — state required tolerances in the RFQ.
- Consistent inspection basis: mechanical and corrosion properties are confirmed by the specified inspection plan and acceptance criteria, not assumed from the seamless process.
Need tubing specified by actual outside diameter and wall thickness? See our Inconel 600 seamless tube range.
Ready to Request a Quotation?
Send the NPS and schedule (or actual OD and wall), quantity, length, end finish and the inspection items you need as acceptance criteria — you will get a written quotation stating the specification and edition, delivery condition, documents included and lead time.
