For the most aggressive mixed-acid and combined oxidizing-reducing environments, the Hastelloy C-family alloys are often the only practical answer. Roben Manufacturing fabricates vessels and components in Hastelloy C-276, C2000, and C-22, the nickel-chromium-molybdenum alloys prized for their versatility across a remarkable range of corrosive media.
These alloys are premium materials, and they demand premium fabrication. We help you select among C-276, C-22, and C2000 based on your specific chemistry and build the equipment with the rigorous welding controls these alloys require to retain their exceptional corrosion resistance.
Versatile Resistance for the Harshest Chemistries
The Hastelloy C-family alloys derive their corrosion resistance from a nickel-chromium-molybdenum composition, with the molybdenum providing strong resistance to pitting and crevice corrosion and to reducing acids, while the chromium handles oxidizing conditions. This combination gives these alloys the rare ability to resist both oxidizing and reducing environments — and the mixed acids and process upsets that switch between them.
C-276 is the long-established workhorse of the family, with a broad track record across chemical processing. C-22 offers enhanced resistance to oxidizing media and outstanding resistance to pitting and crevice attack. C2000 adds a copper contribution for improved performance in certain reducing acids. We help match the specific alloy to the dominant corrosive species and conditions of your service.
Fabrication of these alloys is exacting. They are sensitive to heat input and contamination, and welds must be made with clean preparation, controlled interpass temperatures, and matching filler metals to avoid precipitation that would degrade corrosion resistance. Our qualified procedures protect the alloy's properties from plate to finished weld.
Because these are high-value materials, we engineer efficiently, using weld overlay or clad construction where the design permits to deliver the alloy's protection at reduced cost. Every vessel ships with full traceability and the weld and NDE records that document its integrity.
Why Choose Roben Manufacturing
- Full C-family capability. We fabricate Hastelloy C-276, C2000, and C-22 and help match the right alloy to your chemistry.
- Oxidizing and reducing resistance. These alloys resist both oxidizing and reducing media and the mixed acids that defeat lesser materials.
- Exacting weld control. Clean preparation, interpass control, and matching fillers protect corrosion resistance through fabrication.
- Cost-aware engineering. Weld overlay and clad options deliver the alloy's protection at reduced cost where the design permits.
- Complete documentation. Full material traceability and weld and NDE records accompany every vessel.
Key Features & Capabilities
- Hastelloy C-276 fabrication for broad chemical service
- Hastelloy C-22 for enhanced oxidizing and pitting resistance
- Hastelloy C2000 for improved reducing-acid performance
- Alloy selection matched to dominant corrosive species
- Resistance to mixed oxidizing-reducing environments
- Controlled heat input and interpass temperature in welding
- Matching filler metals and clean joint preparation
- Weld overlay and clad options for cost efficiency
- Full mill test report traceability
- Comprehensive weld and NDE documentation
Applications & Industries Served
- Mixed-acid and aggressive chemical processes
- Reactors and vessels with oxidizing-reducing upsets
- Pharmaceutical and fine-chemical corrosive service
- Flue-gas desulfurization and scrubber components
- Petrochemical equipment in severe corrosion duty
- Process equipment handling chlorides and strong acids
Codes, Standards & Quality Assurance
Roben Manufacturing fabricates under a controlled quality system and holds the ASME U Certificate of Authorization, with registration through the National Board of Boiler and Pressure Vessel Inspectors. Every applicable project is supported by material test reports, qualified welding procedures, nondestructive examination records, and complete documentation.
Relevant standards and resources include: ASTM International; ASME Boiler and Pressure Vessel Certification.
Frequently Asked Questions
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