ASTM B366 Inconel 601 · NiCr23Fe High-Temp to 1200°C · Al₂O₃

2.4851 (Inconel 601) Pipe Fittings

ASTM B366 buttweld pipe fittings in 2.4851 — Inconel 601 (NiCr23Fe, N06601). A nickel-chromium-aluminium alloy designed specifically for high-temperature oxidation resistance. The aluminium addition forms a tightly adherent Al₂O₃ oxide scale that protects the alloy up to 1200°C. Distinguished from Inconel 600 (no Al) by superior scaling resistance. The primary selection criterion is oxidation resistance at very high temperatures — not aqueous corrosion resistance.

Max Service Temp

1200°C

Al Content

1.0–1.7% (Al₂O₃ scale)

ASTM UNS

N06601

Inconel 601 vs 600 vs 625

Grade	W.Nr.	Al	Mo	Max Temp	Primary Use
Inconel 600	2.4816	None	None	~1100°C	Furnace, caustic, SCC resistance
Inconel 601 (this grade)	2.4851	1.0–1.7%	None	~1200°C	High-temp oxidation (Al₂O₃ scale)
Inconel 625	2.4856	None	8–10%	~980°C	Corrosion: seawater, acids (Mo + Nb)

Key Applications

Industrial furnace tubes, muffles, retorts, and radiant tubes operating above 1000°C
Thermal processing equipment: annealing and heat treatment atmospheres
Combustion chamber liners and exhaust manifolds
Carbon black production — nitrogen/hydrocarbon atmosphere above 900°C
Thermal cycling service where scale adhesion is critical (Al₂O₃ adheres better than Cr₂O₃)

Cross-References

W.Nr.	2.4851
EN Name	NiCr23Fe
ASTM UNS	N06601
Trade Name	Inconel 601

Welding

Filler: ERNiCrFe-11 (matching 601 filler). No PWHT required. High-temperature applications typically require solution anneal for full oxidation resistance.

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Testing & Inspection

✓ Chemical analysis against the ordered material standard / ASTM B366
✓ Tensile test, with impact test where the standard or your order requires it
✓ PMI confirming nickel, chromium and aluminium content
✓ PMI (positive material identification) on every order
✓ Visual and dimensional inspection to ASME B16.9
✓ NDT (UT, RT, MT or PT) when your order or code calls for it
✓ EN 10204 3.1 certificate as standard; 3.2 with TÜV, Lloyd's Register, Bureau Veritas, DNV or your own inspector

Size Range

DN15–DN600 and larger. Outside diameters follow the EN 10220 / EN ISO 1127 pipe series; wall thickness is matched to your connecting pipe.

Size	OD (mm)
DN 15	21.3
DN 20	26.9
DN 25	33.7
DN 32	42.4
DN 40	48.3
DN 50	60.3
DN 65	76.1
DN 80	88.9
DN 100	114.3
DN 125	139.7
DN 150	168.3
DN 200	219.1
DN 250	273.0
DN 300	323.9
DN 350	355.6
DN 400	406.4
DN 450	457.0
DN 500	508.0
DN 600	610.0

Export Documents & Packing

✓ Commercial invoice, packing list and certificate of origin
✓ EN 10204 certificates with heat-number traceability
✓ PED 2014/68/EU and AD 2000-Merkblatt W0 documentation for European projects
✓ Seaworthy wooden cases or pallets, bevel ends protected, marked to your instructions
✓ FOB, CFR or CIF delivery terms

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Frequently Asked Questions: Inconel 601 (2.4851) Fittings

What is Inconel 601 (2.4851)?

NiCr23Fe (UNS N06601), a nickel-chromium-aluminium alloy designed for high-temperature oxidation resistance.

Why does Inconel 601 contain aluminium?

The aluminium forms a tightly adherent aluminium-oxide scale that protects the alloy at high temperature.

Which certificates come with Inconel 601 fittings?

EN 10204 3.1 as standard, or 3.2 with third-party inspection.