UNS S32101 Welded Pipes & Tubes

When higher strength is needed without a high nickel alloy, UNS S32101 welded pipes and tubes are a practical lean duplex option. Grade 2101, also known as EN 1.4162, keeps nickel at 1.35% to 1.70% by using manganese and nitrogen to replace much of the nickel in its chemistry. The result is a duplex grade with more than twice the yield strength of 304L, which can help reduce wall thickness in suitable piping applications. Amardeep Steel supplies UNS S32101 welded pipes and tubes to ASTM A789, A790 and A928. Compare the grade with our SS 304L pipes and tubes and UNS S32304 welded pipes and tubes, or explore our range of duplex steel pipes and tubes. Every order includes an EN 10204 3.1 mill test certificate and full heat traceability.

What Are UNS S32101 Welded Pipes and Tubes?

S32101 is a lean duplex stainless steel with 21% to 22% chromium, 4% to 6% manganese and 0.20% to 0.25% nitrogen. Its pitting resistance sits above 304L and close to 316L, and its duplex structure resists chloride stress corrosion cracking far better than austenitic grades. Service is generally kept below about 300°C.

Welding S32101

The high nitrogen in S32101 helps the weld and heat affected zone form austenite as they cool, which keeps toughness and corrosion resistance in the seam. Welded tube and pipe are solution annealed after welding as ASTM A789 and A790 require. Large bores are made as EFW pipe with filler to ASTM A928.

Applications of S32101 Welded Pipes and Tubes

• Water, wastewater and desalination pretreatment piping
• Storage tank and process lines in place of 304L or 316L
• Pulp and paper liquor lines
• Structural, bridge and architectural hollow sections
• Food and beverage utility piping

Testing and Documentation

Every order of S32101 welded pipe and tube goes through the checks below at our testing facility or approved third party labs.

• Chemical analysis and PMI
• Tension and hardness tests
• Flattening test, with flange test on tube
• Hydrostatic or eddy current test on every length
• Weld seam radiography for ASTM A928 classes that call for it
• Ferrite content check on weld and base metal on request
• Visual and dimensional inspection, including weld bead height

Mill test certificates are issued to EN 10204 3.1, with 3.2 available on request. You can view our approvals on the certificates page.

Packing and Marking

Each length is marked with the standard, UNS S32101, size, heat number and manufacturer name. Ends are capped, and pipes are kept apart from carbon steel and packed in bundles or wooden boxes. Read more about our packing and despatch process.