Nickel Alloy & Super Alloy Columns

Roben, Mfg., Inc. specializes in the custom engineering and fabrication of nickel alloys and super alloys 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 Nickel Alloys and Super Alloys Are

Nickel alloys and super alloys are high-performance metallic materials based on nickel, often combined with chromium, molybdenum, copper, or iron. They include Inconel (Ni-Cr-Fe), Incoloy (Ni-Fe-Cr), Hastelloy (Ni-Mo-Cr), Monel (Ni-Cu), and proprietary alloys such as Alloy 20. They are selected when stainless steel cannot withstand the service.

Why Nickel Alloys and Super Alloys Matter

Nickel alloys are required wherever the service exceeds the corrosion or temperature capability of stainless steel — strong acids, hot chlorides, high-temperature oxidation, sulfide stress-cracking, or seawater. Specifying the right nickel alloy is mission-critical to column life and plant uptime.

Nickel Alloys and Super Alloys — Specifications and Capabilities

Inconel grades: 600, 601, 625, 718, 825

Incoloy grades: 800, 800H, 800HT, 825

Hastelloy grades: B-3, C-276, C-22, C-2000

Monel: 400, K-500

Alloy 20: UNS N08020

Forms: Plate, pipe, forgings, fittings — full traceability with MTRs

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 Nickel Alloys and Super Alloys

When should I use a nickel alloy instead of stainless steel?

When the service contains hot chlorides, strong reducing or oxidizing acids (HCl, H2SO4, HF, HNO3), elevated H2S, or operates at high temperature. Nickel alloys also offer better high-temperature creep resistance.

What is the difference between Inconel 625 and Inconel 718?

Inconel 625 is a solid-solution-strengthened alloy with excellent corrosion resistance and good high-temperature strength. Inconel 718 is precipitation-hardened for higher mechanical strength but with lower corrosion resistance and weldability than 625.

Which nickel alloy is best for sulfuric acid service?

Selection depends on concentration and temperature. For dilute hot H2SO4, Alloy 20 is common; for stronger acid, Hastelloy C-276 or C-2000 is preferred; for very concentrated cold acid, carbon steel is sometimes acceptable.

What welding qualifications does Roben Mfg. hold on nickel alloys?

We hold ASME Section IX qualifications for GTAW and SMAW on Inconel 625, 600, Incoloy 800, Hastelloy C-276/C-22/C-2000, Monel 400, and Alloy 20, with matching consumables (ENiCrMo-3, ENiCrMo-4, etc.).

Can Roben Mfg. fabricate clad-construction vessels using nickel alloy as the cladding?

Yes. We routinely fabricate carbon-steel-backed columns with explosively bonded or roll-bonded Inconel, Incoloy, Hastelloy, or Monel cladding — combining the cost of carbon steel with the corrosion resistance of the nickel alloy.

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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Nickel Alloy and Super Alloy Column Fabrication