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) in 6 product forms 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.
Strengths: Excellent resistance across the sulphuric acid concentration range, Niobium stabilised, so welds resist intergranular attack and Good resistance to chloride stress corrosion cracking. Limitations: Expensive, approaching nickel alloy pricing, Work hardens quickly and is demanding to machine and Limited availability outside held stock.
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.
Each combination is a page with its own dimensional range, finishes and standards.
Send the form, size, quantity and standard. We will confirm what is in stock and quote.
