Nickel Alloy 20 Fittings (UNS N08020)

We supply Alloy 20 pipe fittings for demanding industrial applications where corrosion resistance and uptime are critical. Also known as Carpenter 20 or 20Cb-3, this nickel-iron-chromium alloy with copper and molybdenum is designed for service in sulfuric, phosphoric, and nitric acid environments. We deliver seamless butt weld fittings from stock and offer highly competitive complete piping packages.

High-quality Alloy 20 fittings

Designed for critical piping in corrosive service

Acid resistance

Reliable in sulfuric and phosphoric acids.

Stabilized alloy

Niobium stabilized against intergranular corrosion.

Seamless stock

Seamless butt weld fittings up to 6”.

Package supply

Cost-effective complete piping package solutions.

Certified procurement

Supplied with EN 10204 certification.

Send your enquiry

Alloy 20 fittings in stock

Responsive Specificatie Tabel

Property	Value
Material	Alloy 20
Standard	ASTM B366
UNS	N08020
Available sizes	½″–6″
Wall thickness range	Schedule 10S to Schedule 80S
Typical items	Elbows, tees, reducers, caps
Condition	Seamless buttweld

Need Alloy 20 pipe fittings for a specific requirement? Maass supplies seamless butt weld fittings from stock in UNS N08020 / ASTM B366 (DIN 2.4660), with additional welded or forged 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 20 / UNS N08020 is designed to combine strong corrosion resistance with reliable performance in acid-related service.

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

Element	Limit (%)
Nickel (Ni)	32.0 – 38.0
Chromium (Cr)	19.0 – 21.0
Copper (Cu)	3.0 – 4.0
Molybdenum (Mo)	2.0 – 3.0
Iron (Fe)	Balance
Carbon (C)	0.07 max.
Niobium + Tantalum (Nb+Ta)	8xC min. – 1.0 max
Manganese (Mn)	2.0 max.
Phosphorus (P)	0.045 max.
Sulfur (S)	0.035 max.
Silicon (Si)	1.0 max.

Typical physical and mechanical properties of Alloy 20

The values below provide a general indication of the typical physical and mechanical properties of Alloy 20. These values are intended as typical material data only, since actual values may vary depending on product form, size, supply condition, and order specification.

Property	Unit	Typical value
Density	lb/in³	0.292
Melting range	°F	2520 – 2600
Specific heat	Btu/lb-°F	0.12
Elastic modulus	10³ ksi	28.0
Shear modulus	10³ ksi	11.0
Poisson’s ratio	-	0.31
Thermal conductivity	Btu-in/ft²-h-°F	85
Coefficient of expansion	10^-6 in/in-°F	8.2
Tensile strength	ksi	80 min.
Yield strength	ksi	35 min.
Elongation	%	40

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Mail us

sales@maass-special-alloys.com

Call us

+31 (0)30 8200 370