Alloy 20 sits on the boundary between stainless steel and nickel alloy. The copper addition targets sulphuric acid specifically, and niobium stabilisation prevents sensitisation in welded assemblies. It remains the reference material for sulphuric acid pumps, valves and piping across the full concentration range.
Pitting resistance equivalent. Higher resists chlorides better.
Indexed to 304. Indicative, for specification triage.
Rajgranth Metal & Alloys manufactures, stocks, supplies and exports Alloy 20 (Carpenter 20) welded Tubes (UNS N08020) from Mumbai. Nickel-iron-chromium with copper and niobium. Developed for sulphuric acid. Rajgranth Metal & Alloys has been trading since 1980, is self-funded and debt-free, and despatches most orders from its Mumbai stockyard within two days.
Alloy 20 sits on the boundary between stainless steel and nickel alloy. The copper addition targets sulphuric acid specifically, and niobium stabilisation prevents sensitisation in welded assemblies. It remains the reference material for sulphuric acid pumps, valves and piping across the full concentration range.
Alloy 20 (Carpenter 20) is also designated UNS N08020, EN 2.4660, AISI Alloy 20 and Werkstoff NiCr20CuMo. Quote the designation your specification uses and we will supply to it.
Excellent resistance across the sulphuric acid concentration range, Niobium stabilised, so welds resist intergranular attack and Good resistance to chloride stress corrosion cracking. It is non-magnetic, with good weldability and difficult machinability, and is used in continuous service in air up to about 500 °C.
Expensive, approaching nickel alloy pricing, Work hardens quickly and is demanding to machine and Limited availability outside held stock. We state these plainly so the grade is chosen for the right service.
Our published range covers outside diameter 4.7, 76.2 (mm — larger sizes to order), wall thickness 0.5 to 3.0 (mm), length 5 m, 6.5 m (Customised per requirement) and tube ends Plain, Bevelled. Standards include ASTM A213 / ASME SA-213, ASTM A269, ASTM A312 / ASME SA-312, ASTM A376 / ASME SA-376, ASTM A789 / ASME SA-789, ASTM A790 / ASME SA-790, ASTM A268 / ASME SA-268, ASTM A511, ASTM B163 / ASME SB-163 and ASTM B407 / ASME SB-407. Finishes and conditions include Bright Annealed (CFA), Solution Annealed (CFD), Electro Polished (EP), Polished (APP), Annealed and Pickled (AP), Mirror Polish, Matt Polish and Cold Drawn.
sulphuric acid pumps, valves and piping, pickling equipment, pharmaceutical process vessels and fertiliser and chemical plant. Typical industries: chemical, pharmaceutical, fertiliser and petrochemical. We supply across India and export to markets in the Middle East, Africa, Europe, Asia, North America and South America.
Material is supplied with documentation, tested in house across 18 listed testing facilities, and covered by our ISO 9001:2015 quality management system. Rajgranth Metal & Alloys has been trading since 1980, is self-funded and debt-free, and despatches most orders from its Mumbai stockyard within two days.
Individually listed because these are the sizes most often asked for. Everything else is supplied to order.
mm — larger sizes to order
mm
Customised per requirement
The full detail for this product as supplied from our Mumbai stockyard: sizes, grades, standards, tolerances, tests and applications.
Rajgranth Metals is a leading Manufacturers, Suppliers, & Exporters of Stainless Steel Welded Tubes Grades Alloy 20 in Mumbai, India.
Size x Thickness x Standard x Specification x Grade
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