Inconel / Incoloy / Alloy 20 Columns

Roben, Mfg., Inc. specializes in the custom engineering and fabrication of inconel, incoloy, alloy 20 &nickel for chemical, fine chemical, petrochemical, pharmaceutical, food and beverage, defense, and power-generation industries. Every project is designed to ASME Section VIII Division 1 (with optional Division 2), is National Board registered, complies with the European Pressure Equipment Directive (PED 2014/68/EU) for CE marking, and is registered under the Canadian Registration Number (CRN) system for all Canadian provinces.

What Inconel, Incoloy, Alloy 20 & Nickel Are

Inconel is a family of nickel-chromium-iron alloys (600, 601, 625, 718, 825) for high-temperature and corrosion service. Incoloy is the iron-rich cousin (800, 800H, 825) for high-temperature and sulfide-stress-cracking resistance. Alloy 20 (UNS N08020) is a nickel-iron-chromium alloy specifically engineered for sulfuric acid service. Pure nickel (Nickel 200/201) is used for caustic and high-purity service.

Why Inconel, Incoloy, Alloy 20 & Nickel Matter

Each of these alloys has a primary application: Inconel 600/625 for high-temperature and saltwater service; Incoloy 800/825 for sulfide-stress and high-temperature creep service; Alloy 20 for sulfuric acid plants and pickling service; Nickel 200 for hot caustic service. Selecting the right alloy is critical to column life and economics.

Inconel, Incoloy, Alloy 20 & Nickel — Specifications and Capabilities

Inconel: 600, 601, 625, 718, 825

Incoloy: 800, 800H, 800HT, 825

Alloy 20: UNS N08020 — sulfuric acid service

Nickel 200/201: pure nickel for hot caustic and high-purity service

ASME VIII Div. 1 approved: All listed grades

Forms: Plate, pipe, forgings, fittings, with full MTR traceability

Certifications and Codes

ASME Section VIII Division 1 — U-stamp

ASME Section VIII Division 2 — available on request

National Board registration — R-stamp

PED 2014/68/EU — CE marking with Notified Body coordination

CRN — registered for all Canadian provinces

NACE MR0175 / ISO 15156 — sour-service compliance

AWS D1.1 / ASME Section IX — qualified welding procedures and welders

Frequently Asked Questions About Inconel, Incoloy, Alloy 20 & Nickel

When should I specify Inconel 625 vs. Incoloy 825?

Inconel 625 is the broader-service nickel-base alloy with the best high-temperature strength and broad corrosion resistance. Incoloy 825 is more economical (higher iron content) and is preferred for sulfuric acid and sulfide-stress-cracking service where its more limited capability is sufficient.

What is Alloy 20 used for?

Alloy 20 (UNS N08020) is engineered for sulfuric acid service and is widely used in sulfuric acid plants, pickling lines, and chemical reactors handling dilute-to-medium-concentration H2SO4 at moderate temperatures.

When is pure nickel (Nickel 200/201) the right choice?

Pure nickel is the standard for hot concentrated caustic (NaOH/KOH) service and for high-purity chemical service where copper or iron contamination cannot be tolerated. Nickel 201 (low-carbon) is preferred for service above 600 °F to avoid graphitization.

What is the difference between Incoloy 800 and 800H?

Incoloy 800 is the standard grade. 800H has tighter chemistry control (carbon, aluminum, titanium) and a coarser grain structure for improved high-temperature creep resistance. 800HT extends this further. Use 800H/HT for service above 1100 °F.

Does Roben Mfg. hold ASME procedure qualifications for these alloys?

Yes. We hold ASME Section IX qualifications for GTAW and SMAW on Inconel 600/625/718, Incoloy 800/825, Alloy 20, and Nickel 200/201, with matching consumables for each.

Request a Quote on This Project

Contact Roben Mfg., Inc. to discuss your project specifications, timeline, and material requirements.

📞 (732) 364-6000 ✉ sales@robenmfg.com 📍 760 Vassar Ave, Lakewood, NJ 08701

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Inconel, Incoloy, Alloy 20, and Nickel Column Fabrication