Introduction

Alloy 20 Pipe (also known as Carpenter 20 Pipe, Alloy 20 Seamless Pipe, Alloy 20 Welded Pipe, UNS N08020 Pipe, DIN 2.4660 Pipe) is a nickel-iron-chromium austenitic alloy developed specifically for maximum resistance to acid attack, particularly sulfuric acid. It conforms to ASTM B729 Alloy 20 Pipe (seamless, cold-worked or hot-finished), ASTM B464 Alloy 20 Pipe, ASTM B468 Alloy 20 Pipe, and ASME SB729 Alloy 20 Pipe. This corrosion resistant alloy 20 pipe is widely used in chemical processing plants, fertilizer production, pharmaceutical equipment, acid storage systems, and pickling lines where 316L and other standard stainless steels are inadequate.

Key properties of Alloy 20 Pipe:

• Sulfuric acid corrosion resistance – excellent resistance to sulfuric acid across a wide range of concentrations and temperatures; resistant to hot sulfuric acid with corrosion rates <0.13 mm/year up to 50°C

• Chloride stress corrosion cracking resistance – with approximately 33% nickel content, Alloy 20 has practical immunity to chloride SCC

• Superior corrosion resistance – excellent resistance to phosphoric acid, nitric acid, and a variety of chemical environments

• Nickel-iron-chromium alloy – contains copper (3-4%) and molybdenum (2-3%) additions that enhance resistance to pitting and crevice corrosion

• Niobium stabilized – contains niobium (Cb) for stabilization against sensitization and intergranular corrosion

• Good fabricability – suitable for TIG, MIG, and SAW welding; easily formed through hot and cold working

Note: Alloy 20 was developed specifically to withstand sulfuric acid. Its nickel, chromium, molybdenum and copper levels provide excellent general corrosion resistance, making it the preferred choice for acid handling systems, fertilizer plants, and pharmaceutical processing.

This acid resistant nickel alloy pipe is available in seamless (ASTM B729) and welded (ASTM B464/B468) forms, cold drawn and hot finished, with pickled or polished surfaces. We offer custom sizes, cut to length, large diameter, and Schedule 40/Schedule 80 options. Our product range includes Alloy 20 seamless pipe, welded pipe, large diameter alloy 20 pipe, thin wall alloy 20 tubing, custom size, and cut to length pipe.

Specifications & Process Options

We provide Alloy 20 Pipe Size Chart, Weight Chart, and Dimensions – request yours.

Applications

1. Sulfuric Acid Service & Chemical Processing Plants

• Alloy 20 pipe for sulfuric acid service – piping systems for sulfuric acid production, concentration, storage, and transfer in chemical plants and acid handling facilities. Sulfuric acid resistant pipe withstands hot concentrated acid where 316L would rapidly corrode.

• Alloy 20 pipe for chemical processing plants – reactor feed lines, distillation column piping, heat exchanger tubes, and transfer piping for aggressive chemical streams. Corrosion resistant process piping ensures long service life in sulfuric, phosphoric, and nitric acid environments.

• Alloy 20 pipe for acid storage systems – tank outlet piping, vent lines, and recirculation loops for sulfuric acid, phosphoric acid, and mixed acid storage. Acid resistant alloy pipe prevents leakage and extends tank farm life.

2. Fertilizer Production & Pickling Lines

• Alloy 20 pipe for fertilizer production – piping for phosphoric acid evaporators, sulfuric acid digesters, and NPK fertilizer granulation scrubbers. Fertilizer plant piping material resists the corrosive mix of acids, fluorides, and chlorides common in phosphate fertilizer production.

• Alloy 20 pipe for pickling lines – pickling bath circulation lines, heating coils, and acid recovery systems in steel and stainless steel pickling operations (sulfuric and mixed acid pickling). Chemical service alloy material withstands hot acid and ferric chloride solutions.

• Alloy 20 pipe for fertilizer industry piping – also used in ammonium sulfate crystallizers, urea synthesis lines, and superphosphate reactors.

3. Pharmaceutical Equipment & Process Piping Systems

• Alloy 20 pipe for pharmaceutical equipment – high‑purity process piping for API synthesis, solvent transfer, and acid digestion steps in pharmaceutical manufacturing. Pharmaceutical process pipe meets stringent purity requirements while resisting corrosive reagents.

• Alloy 20 pipe for process piping systems – chemical transfer lines, reactor jackets, and solvent recovery systems in fine chemical and specialty chemical production. Specialty alloy pipe manufacturer solutions for demanding acid service.

• Alloy 20 pipe for petrochemical plants – alkylation unit piping, acid gas handling, and catalyst regeneration lines where sulfuric and hydrofluoric acids are present.

4. Heat Exchangers & Wastewater Treatment

• Alloy 20 pipe for heat exchangers – shell‑and‑tube and plate heat exchangers for acid coolers, reboilers, and condensers in chemical and pharmaceutical service. Corrosion resistant alloy 20 pipe provides reliable heat transfer in corrosive fluids.

• Alloy 20 pipe for wastewater treatment plants – acid neutralization lines, effluent transfer piping, and chemical dosing systems for industrial wastewater treatment. Industrial acid handling pipe resists variable pH and aggressive industrial effluents.

Why Choose Us as Your Alloy 20 Pipe Supplier?

We are a trusted alloy 20 pipe supplier, alloy 20 pipe manufacturer, Carpenter 20 pipe supplier, UNS N08020 pipe supplier, sulfuric acid resistant pipe specialist, chemical process alloy pipe provider, acid resistant nickel alloy pipe manufacturer, pharmaceutical process pipe fabricator, fertilizer plant piping material stockist, corrosion resistant process piping distributor, specialty alloy pipe manufacturer, and China Alloy 20 pipe factory. All products meet ASTM B729 / ASME SB729 with mill test certificates, chemical analysis, mechanical property reports, and NDT (hydrostatic, eddy current) as required.

What we offer:

• Forms: Seamless pipe (B729), welded pipe (B464/B468)

• Sizes: 1/2″ to 12″ NPS; Alloy 20 Pipe 1 Inch, 2 Inch, 3 Inch, 4 Inch in stock; large diameter alloy 20 pipe up to 24″ on request

• Schedules: SCH40, SCH80, SCH10, and custom

• Surface finishes: pickled (standard), polished, as‑drawn, as‑welded

• Customization: Custom size, cut to length, cold drawn or hot finished per requirement

• Certifications: EN 10204 3.1, PMI, full traceability

• Global shipping: Exporter to chemical processors, fertilizer plant builders, pharmaceutical equipment manufacturers, and acid handling system fabricators worldwide

Contact us for Alloy 20 Pipe Size Chart, Weight Chart, Dimensions, or a quote on Alloy 20 Pipe 1 Inch, 2 Inch, 3 Inch, 4 Inch, SCH40, SCH80, large diameter, or custom requirements.

MONO Group is one of Alloy 20 Pipe  and other Superalloy, Nickel alloy, High Temperature Alloy Manufacturer, Supplier, Wholesaler from China, We can supply high quality alloy plate, sheet, round bar, tube, pipes, fittings, flange, and custom parts in accordance with ASTM, ASME, DIN, ISO, GB and other international standards. For inquiries or to request a quote, please freely contact us at info@monokj.com.