Inconel 600 Buttweld Pipe Fittings
Inconel 600 / UNS N06600 / EN 2.4816 (NiCr15Fe) — 76Ni-15Cr-8Fe nickel-chromium alloy for high-temperature oxidation resistance, heat treatment equipment, nuclear steam generators and furnace applications. Service to 1177°C intermittent. Excellent resistance to stress corrosion cracking in caustic and high-temperature water. ASME B16.9 and EN 10253-2 Type B. EN 10204 3.1 standard; 3.2 TPI on request.
½″–24″
Size Range
1177°C
Max Temp (Intermit.)
550 MPa
Min UTS (Annealed)
Nuclear
N06600 SCC Resistant
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Inconel 600 Grade Equivalents
| Trade Name | UNS | EN W.Nr. | EN Name | ASME P-No. |
|---|---|---|---|---|
| Inconel 600 | N06600 | 2.4816 | NiCr15Fe | 42 |
| Alloy 600 (generic) | N06600 | 2.4816 | NiCr15Fe | 42 |
Chemical Composition — Inconel 600 / N06600 / EN 2.4816
| Element | Specification |
|---|---|
| Ni | ≥72.0% (balance) |
| Cr | 14.0–17.0% |
| Fe | 6.0–10.0% |
| Mn | ≤1.0% |
| Si | ≤0.50% |
| C | ≤0.150% |
Simple ternary alloy — high Ni content gives excellent corrosion resistance in caustic environments and high-temperature oxidising atmospheres. No Mo — limited resistance to reducing acids (specify Hastelloy C-276 for HCl/H2SO4). ASME P-No. 42.
Mechanical Properties — Inconel 600 (Annealed)
| Property | Min. UTS | Min. YS | Elongation | Max Cont. Temp | Max Intermit. Temp |
|---|---|---|---|---|---|
| Annealed (ASTM B366) | 550 MPa | 240 MPa | ≥30% | 1093°C | 1177°C |
Welding & PWHT — Inconel 600
✓ No PWHT Required
Inconel 600 does not require post-weld heat treatment in standard fabrication. The alloy is not susceptible to sensitization under normal welding conditions. Solution annealing at 1010–1066°C may be specified after severe cold forming.
Filler Metal
ERNiCrFe-6 or ERNiCr-3 (alloy 82) for GTAW/GMAW. ERNiCrFe-6 provides a near-matching deposit; ERNiCr-3 gives slightly higher strength and wider availability.
Preheat
No preheat required for material at or above room temperature. Avoid welding on surfaces below 15°C without warming.
Inter-pass Temperature
Maximum 150°C. Low heat input preferred to minimise HAZ width. Stringer beads recommended over weaving.
Heat Input
Low heat input. Use argon back purge for root passes on critical high-temperature service. Ensure complete penetration to avoid crevice conditions.
Inconel 600 vs Inconel 625 — Key Differences
| Property | Inconel 600 (N06600) | Inconel 625 (N06625) |
|---|---|---|
| Mo content | None | 9% |
| Primary use | High-temperature / nuclear | Corrosion / sour gas / subsea |
| Max temperature | 1177°C | 650°C (corrosion service) |
| Aqueous corrosion | Moderate | Excellent (PRE >50) |
| Cost | Lower | Higher |
Inconel 600 Fitting Types
90° Long Radius Elbows
ASME B16.9 / EN 10253-2 Type B. R=1.5D. ½″–24″. Furnace and reactor piping direction changes.
45° Long Radius Elbows
ASME B16.9 / EN 10253-2 Type B. Low-turbulence routing in high-temperature systems.
Equal Tees
ASME B16.9 / EN 10253-2 Type B. Branch connections for nuclear steam and furnace atmosphere distribution.
Reducing Tees
ASME B16.9. Unequal branch connections for complex high-temperature piping layouts.
Concentric Reducers
ASME B16.9 / EN 10253-2. Centreline maintained for horizontal high-temperature runs.
Eccentric Reducers
ASME B16.9 / EN 10253-2. Flat-bottom for pump suction and self-draining lines.
Pipe Caps
ASME B16.9. Ellipsoidal end closure for high-temperature line termination and test blanking.
180° Returns
ASME B16.9 Long Radius. U-bend configurations for furnace tube assemblies and heat recovery loops.
Stub Ends (Lap Joint)
ASME B16.9. For lap joint flanges in high-temperature systems requiring easy disassembly and bolt-hole alignment.
Industries & Applications
Heat Treatment Furnaces
Inconel 600 is the standard alloy for furnace retorts, muffles, and atmosphere piping in carburising, nitriding, and annealing furnaces where temperatures reach 900–1100°C and complex atmospheres prevail.
Nuclear Steam Generators
Alloy 600 has been widely used in pressurised water reactor (PWR) steam generator tubing and piping. Its resistance to stress corrosion cracking in high-temperature pure water and caustic environments is well-established.
High-Temperature Chemical Reactors
Reactors operating above the practical limit of stainless steels, particularly where dry chlorine, hydrogen, or reducing atmospheres are present at elevated temperatures. N06600's high Ni content resists hydrogen embrittlement.
Aerospace Exhaust Systems
Exhaust manifolds, thrust reversers, and high-temperature ducting in aerospace applications requiring oxidation resistance to 1100°C+ with good cyclic thermal fatigue resistance.
Caustic Service
Alloy 600 is resistant to stress corrosion cracking in caustic soda (NaOH) solutions at elevated temperatures — an environment where austenitic stainless steels are susceptible. Specified for caustic evaporators and chemical process piping.
SCC-Resistant Service
Environments prone to chloride or caustic stress corrosion cracking that eliminate stainless steel options. The high Ni content of N06600 gives immunity to chloride SCC in aqueous service up to moderate temperatures.
Frequently Asked Questions
What temperatures is Inconel 600 used at?
Inconel 600 (UNS N06600, EN 2.4816, NiCr15Fe) has useful oxidation resistance up to approximately 1177°C in intermittent service and continuous service up to about 1093°C. It maintains good mechanical properties from cryogenic to elevated temperatures. The primary application is high-temperature service — furnace components, heat treatment equipment, nuclear steam generators, and aerospace exhaust systems. Unlike Inconel 625, alloy 600 has no Mo and lower corrosion resistance in aqueous acid environments — it is selected for its thermal stability, not its acid resistance.
What is the difference between Inconel 600 and Inconel 625?
Inconel 600 (76Ni-15Cr-8Fe, no Mo) is a simpler alloy optimised for high-temperature oxidation and heat resistance. Inconel 625 (58Ni-22Cr-9Mo-3.5Nb) adds molybdenum and niobium, giving it exceptional corrosion resistance in aqueous environments (seawater, acids, H2S) and higher strength. 600 is the choice for high-temperature furnace and nuclear applications; 625 for subsea, sour gas, and marine corrosion. At elevated temperatures, 625 (being precipitation-hardenable) generally has higher strength but at significantly higher cost.
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