Alloy 20 pipe (UNS N08020)

Maass Special Alloys supplies Alloy 20 pipes for demanding industrial applications where corrosion resistance and uptime are critical. Alloy 20 is a nickel-iron-chromium alloy with copper and molybdenum, designed for service in sulfuric acid and other aggressive chemical environments. Available as single pipes or complete packages to spec.

High-quality Alloy 20 pipes

Designed for critical piping in corrosive service

Corrosion resistance

Performs in aggressive chemical environments

Sulfuric acid resistance

Designed for sulfuric acid service

SCC resistant

Helps resist chloride stress cracking

Pitting resistant

Resists pitting and crevice corrosion

Temperature range

Suitable up to 1000°F / 540°C

Send your enquiry

Alloy 20 pipes in stock

Responsive Specificatie Tabel

Standard	Material	Size range	Schedules
ASTM/ASME (S)B 729	UNS N08020	½″ – 8″	Schedule 10S to Schedule 160

Need Alloy 20 seamless pipe? Maass provides UNS N08020 directly from inventory, with flexible supply options for larger project requirements. All materials are fully certified to meet your exact technical specifications.

Alloy 20 pipe manufacturers: Nippon Steel Corporation (NSC), Tubacex & Alleima

Certified supply & additional information

EN 10204 / 3.1 certified
Dual certified in accordance with ASTM / ASME
Material in compliance to International specification
Random lengths or cut-to-length
Stock delivery times

Upon request‍

Bevelling
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. The alloy contains nickel, chromium, copper and molybdenum, with niobium stabilization to help resist intergranular corrosion.

‍

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. Actual values may vary depending on product form, size and supply condition.

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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sales@maass-special-alloys.com

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+31 (0)30 8200 370