Welded Inconel 600 Pipe
Welded Inconel 600 Pipe also known as Alloy 600 welded pipe.It is a high-performance industrial piping product made from a nickel-chromium-iron superalloy.It is manufactured by rolling inconel 600 alloy plates or strips into a cylindrical shape and joining the edges with a longitudinal weld seam.
Material Composition:
Primarily composed of nickel,chromium,and iron.
Welding Processes:
Commonly produced using ERW,EFW,or TIG welding.
Structural Form:
Unlike seamless pipes,welded pipes have a visible or processed seamline and are often used for structural applications or where larger diameters are required.
Specification of Welded Inconel 600 Pipe
| Product | Welded Inconel 600 Pipe |
| Working Temperature | up to 1095°C(2000°F) |
| Dimension Range | Outside Diameter (OD): 6 – 200 mm Wall Thickness (THK): 0.35 – 6 mm Length (L): 0.5 – 12 m The size can be customized according to ASME B36.10 / ASME B36.19 |
| Schedules | SCH 5, 10, 40, 80, 160, XXS, XXH |
| Materials | Inconel 600 | UNS N06600 | W.Nr. 2.4816 | DIN/EN NiCr15Fe |
| Standards | ASTM B517 / ASTM B516 / ASTM B775 / ASTM B474 |
| Surface Finish |
Annealed & Pickled Bright Annealed Mill Finish Polished/Brushed |
| Corrosion Resistance Specifications |
Excellent Resistance To: Chloride-Ion Stress-Corrosion Cracking High-Temperature Oxidation Alkaline/Caustic Corrosion Dry Chlorine & Hydrogen Chloride Ammonia & Nitriding Atmospheres |
| Applications | Heat Treating Industry Chemical & Petrochemical Processing Nuclear Engineering Aerospace & Gas Turbines Pollution Control Pulp & Paper Food Processing |
| Our Strength | Over 10 Years Experience Exporting Pipes & Tubings Stock Available In Common Sizes Customized Fabrication Available Package Supplying of Piping Materials Strict QC With PMI Testing For Every Batch Experience in Exporting to the US,Germany,UAE,etc. Third Party Inspection Available |
For more information on inconel 600 pipe and other products, please contact us.
Welded Inconel 600 Pipe Chemical Composition (%)
| Ni | Cr | Fe | C |
| 72.0 Min | 14.0 – 17.0 | 6.0 – 10.0 | 0.15 Max |
| Mn | Si | Cu | S |
| 1.00 Max | 0.50 Max | 0.50 Max | 0.015 Max |
Is the composition of the weld metal identical to that of the base metal?
Not entirely the same.
To compensate for element burn-off during welding and prevent hot cracks,ERNiCr-3 (Inconel 82) welding wire is typically used.The welding wire generally contains higher levels of manganese (Mn) and niobium (Nb),whereas the base material Inconel 600 itself contains no niobium or only trace amounts.
Which standard specifies the chemical composition requirements for welded pipes?
Primarily follows ASTM B517 (welded pipe) or ASTM B516 (welded tubing).These standards reference the uniform composition specification for UNS N06600,ensuring consistent chemical properties for materials supplied globally.
Welded Inconel 600 Pipe Mechanical Properties(Typical value range)
| Performance Metrics | Tensile Strength | Yield strength | Elongation | Hardness |
| 550 – 690 MPa (80 – 100 ksi) | 240 – 345 MPa (35 – 50 ksi) | ≥ 414 MPa (60 ksi) | 30% – 50% | 120 – 170 HB |
Is the strength of a weld seam weaker than that of the base metal?
No.Welded pipes manufactured according to specifications must have weld metal strength equal to or exceeding the minimum specified value of the parent material. During “full-section tensile tests,” fractures typically occur at the parent material rather than the weld, demonstrating the reliability of the welding process.
Can welded pipes withstand severe deformation (such as bending)?
Yes.Inconel 600 exhibits excellent ductility.As per the standard requirements,welded tubes must pass the flattening test,which involves compressing the tube to three times its wall thickness without cracking the weld.
Does the manufacturing process (cold rolling vs. hot rolling) alter the properties?
Yes,manufacturing processes significantly impact mechanical properties.Cold rolling induces strain hardening,which substantially increases tensile and yield strength while raising hardness.However,it reduces ductility (elongation) and introduces internal stresses.In contrast,hot rolling occurs above recrystallization temperatures,resulting in a more malleable,”softer” material with lower strength but superior formability and higher elongation.
In practice,most welded inconel 600 pipes undergo annealing after cold rolling to “reset” the structure.This ensures a balance of high corrosion resistance and standard mechanical values (approx. 550MPa tensile),regardless of the initial rolling method.
Physical Properties of Welded Inconel 600 Pipe
Density:8.47 g/cm³ (0.306 lb/in³)
Melting Range:1354°C – 1413°C (2470°F – 2575°F)
Specific Heat:444 J/kg · ℃ (at 20 ℃)
Poisson’s Ratio:0.29
Magnetic Permeability:This alloy exhibits non-magnetic properties and remains non-magnetic even in cryogenic environments.
Thermal Properties of Welded Inconel 600 Pipe
| Property | Temperature | Value |
| Thermal Conductivity | 20 °C (70 °F) | 14.8 W/m·K(103 Btu·in/ft²·h·°F) |
| 400 °C (750 °F) | 19.3 W/m·K(134 Btu·in/ft²·h·°F) | |
| 800 °C (1470 °F) | 25.2 W/m·K(175 Btu·in/ft²·h·°F) | |
| Mean Coefficient of | 20 – 100 °C | 13.3 μm/m·°C(7.4 μin/in·°F) |
| Thermal Expansion | 20 – 500 °C | 15.3 μm/m·°C(8.5 μin/in·°F) |
| 20 – 1000 °C | 16.7 μm/m·°C(9.3 μin/in·°F) |
Why does thermal conductivity increase at higher temperatures?
Unlike many materials whose conductivity drops as they get hotter,inconel 600’s thermal conductivity increases from 14.8 W/m·K (at 20°C) to over 25 W/m·K (at 800°C).This makes it highly efficient for high-temperature heat exchangers and furnace muffles,as it transfers heat better when the process is at full operating temperature.
Can the pipe withstand “Thermal Shock”?
Yes.Due to its high nickel content and excellent ductility,inconel 600 can withstand rapid temperature changes (thermal shock) better than many stainless steels.However,for welded pipes,ensure the weld is of high quality (passed X-ray/NDT) to prevent fatigue cracks at the seam over time.
Manufacturing Process for Welded Inconel 600 Pipe
The manufacturing process for welded inconel 600 pipe (Alloy 600 / UNS N06600) involves several high-precision steps to ensure the weld seam matches the superior corrosion resistance and high-temperature strength of the base metal.
Raw Material Preparation
Slitting:
High-quality Inconel 600 hot-rolled or cold-rolled strips/plates are slit to the exact width required for the specific pipe diameter.
Cleaning:
The edges and surfaces are thoroughly cleaned to remove oil,grease,and oxides,which is critical for nickel alloys to prevent weld contamination.
Tube Forming
Continuous Roll Forming:
For smaller diameters,the strip passes through a series of rollers that gradually bend it into a cylindrical shape.
Press Braking / JCOE:
For large-diameter heavy-wall pipes,individual plates are pressed into a “U” shape and then an “O” shape.
Welding
TIG (Tungsten Inert Gas):
Most common for high-quality pipes;provides a clean,precise weld with or without filler metal.
Plasma Arc Welding (PAW):
Used for thicker walls to ensure full penetration in a single pass.
Filler Metal:
Usually ERNiCr-3 (Inconel 82) is used to ensure the weld area has equivalent or superior properties to the base metal.
Weld Seam Treatment
Scarfing/Grinding:
The internal and external weld “beads” (the raised part of the weld) are removed or leveled using mechanical tools to create a smooth surface,reducing fluid turbulence and stress concentration.
Heat Treatment
Solution Annealing:
The welded pipe is heated to approx. 1010°C – 1150°C (1850°F – 2100°F) and rapidly cooled (quenched).
Purpose:
This “resets” the grain structure,relieves welding stresses,and ensures maximum corrosion resistance.
Sizing and Straightening
The pipe passes through sizing rolls to meet strict ASTM B517 dimensional tolerances for outside diameter (OD) and roundness.
Inspection and Testing
Our manufactured pipes undergo rigorous testing upon completion,including non-destructive testing,hydrostatic pressure testing, and mechanical property testing.Finally,they are acid-washed to remove heat tints and restore the protective oxide layer.
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