Inconel, Incoloy, Alloy 20, and commercially pure nickel each bring a distinct strength to process equipment, and Roben Manufacturing fabricates vessels and components in all of them. Inconel and Incoloy lead in high-temperature strength and oxidation resistance, Alloy 20 is the classic choice for sulfuric acid, and pure nickel excels against caustics — together covering services that span the toughest corners of process chemistry.
Selecting among these materials is about matching the alloy's particular strength to your dominant challenge. We help make that match and bring the welding expertise each of these nickel-rich materials requires.
Specialized Nickel-Rich Alloys for Targeted Service
Inconel alloys, based on nickel and chromium, retain strength and resist oxidation at high temperatures where steels lose their integrity. They serve in high-temperature reactors, heat-recovery equipment, and other duties at the upper edge of the thermal envelope, and they also resist many corrosive environments at temperature.
Incoloy alloys, with their nickel-iron-chromium base, bridge the gap between stainless steels and the higher nickel alloys, offering good high-temperature strength and resistance to oxidation and carburization at a different cost-performance point. Alloy 20, a nickel-iron-chromium alloy with copper and molybdenum, was developed specifically for sulfuric acid service and resists the pitting and stress-corrosion cracking that challenge stainless steels in that environment.
Commercially pure nickel offers exceptional resistance to caustic soda and other alkaline environments, particularly at high concentrations and temperatures, making it the material of choice for caustic-handling equipment. Each of these materials is selected for the specific corrosive or thermal challenge it addresses best.
All of these nickel-rich materials require disciplined welding with clean preparation, controlled heat input, and the correct filler metals to preserve their properties. Every vessel ships with full traceability and weld documentation, and clad or overlay construction is available where it offers a cost advantage.
Why Choose Roben Manufacturing
- Full range of nickel-rich alloys. We fabricate Inconel, Incoloy, Alloy 20, and pure nickel and match each to the service it suits best.
- High-temperature capability. Inconel and Incoloy retain strength and resist oxidation where steels fail at temperature.
- Sulfuric-acid and caustic specialists. Alloy 20 targets sulfuric acid and pure nickel targets caustics, covering two demanding chemistries.
- Expert nickel-alloy welding. Clean preparation, controlled heat input, and correct fillers preserve each alloy's properties.
- Documentation and cost options. Full traceability is provided, with clad and overlay options where they save cost.
Key Features & Capabilities
- Inconel fabrication for high-temperature strength and oxidation resistance
- Incoloy fabrication for high-temperature and carburization resistance
- Alloy 20 fabrication for sulfuric acid service
- Commercially pure nickel for caustic and alkaline service
- Alloy selection matched to thermal or corrosive challenge
- Qualified welding with controlled heat input
- Correct matching filler-metal selection
- Clad and weld-overlay options for cost efficiency
- Full mill test report traceability
- Comprehensive weld and NDE documentation
Applications & Industries Served
- High-temperature reactors and heat-recovery equipment
- Sulfuric acid process equipment (Alloy 20)
- Caustic soda and alkaline handling (pure nickel)
- Oxidation- and carburization-prone high-temperature duties
- Chemical and petrochemical corrosive service
- Equipment combining heat and corrosion challenges
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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