Nickel Alloy 625 Fittings (UNS N06625)

Alloy 625 fittings for demanding piping systems where corrosion resistance, strength and certified material supply are critical. This nickel-chromium-molybdenum alloy with niobium is used for its high strength, excellent fabricability and resistance in severe industrial environments. We supply seamless buttweld fittings from stock, with welded and forged fitting options available for project-driven requirements.

High-quality Alloy 625 fittings

Designed for certified high-strength piping packages

High strength

Exceptional strength without heat hardening.

Severe corrosion

Performs reliably in severe marine environments.

Seamless stock

Immediate supply of seamless buttweld fittings.

Package supply

Combine fittings with matching pipes and flanges.

Fully certified

Supplied with EN 10204 certification.

Send your enquiry

Alloy 625 fittings in stock

Responsive Specificatie Tabel

Property	Value
Standard	ASTM B366
UNS	N06625
Available sizes	½″–4″
Wall thickness range	Schedule 10S to Schedule XXS
Typical items	elbows, tees, reducers and caps

Need Alloy 625 fittings for a specific requirement? We supply seamless buttweld fittings from stock in UNS N06625 / ASTM B366, with forged and welded supply options available for project-driven requirements.

Certified supply & additional information

EN 10204 3.1 or EN 10204 3.2 certified
Material supplied in accordance with applicable international specifications
Stock or production supply
European, South Korean or North-American manufacturers
Approved by major oil, gas and petrochemical companies
Stock availability subject to current inventory

Upon request‍

Welded buttweld fittings
Forged socket-weld or threaded fittings (3000, 6000, 9000 lbs)
Additional testing
Third-party inspection

Chemical composition

The composition of Alloy 625 / UNS N06625 is designed to combine high strength with excellent corrosion resistance across a wide range of industrial environments.

Below chemical composition limits are provided for quick reference. Final compliance is confirmed on the Mill Test Certificate (EN 10204) and the applicable order specification.

Element	Limit (%)
Nickel (Ni)	58.0 min.
Chromium (Cr)	20.0 – 23.0
Iron (Fe)	5.0 max.
Molybdenum (Mo)	8.0 – 10.0
Niobium + Tantalum (Nb+Ta)	3.15 – 4.15
Carbon (C)	0.10 max.
Manganese (Mn)	0.50 max.
Silicon (Si)	0.50 max.
Phosphorus (P)	0.015 max.
Sulfur (S)	0.015 max.
Aluminum (Al)	0.40 max.
Titanium (Ti)	0.40 max.
Cobalt (Co)	1.0 max.
Copper (Cu)	0.75 max.

Typical physical and mechanical properties of Alloy 625

The values below provide a general indication of the typical physical and mechanical properties of Alloy 625 across a range of temperatures. Actual values may vary depending on product form, size, supply condition and final order specification.

Property	Unit	Typical value
Density	lb/in³	0.305
Melting range	°F	2350 – 2460
Specific heat at 70°F	Btu/lb-°F	0.098
Mean thermal expansion at 200°F	x10^-6 in/in-°F	7.1
Thermal conductivity at 70°F	Btu-in/ft²-h-°F	68
Modulus of elasticity at 70°F	10³ ksi	30.1
Poisson’s ratio at 70°F	-	0.278
Tensile strength	ksi	100 – 120
Yield strength	ksi	40 – 60
Elongation	%	30

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Mail us

sales@maass-special-alloys.com

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+31 (0)30 8200 370