Austenitic and duplex stainless steels are the workhorses of corrosion-resistant process equipment, and Roben Manufacturing fabricates pressure vessels, reactors, columns, and heat exchangers in both families. Austenitic grades such as 304/304L and 316/316L offer excellent general corrosion resistance and easy fabrication, while duplex grades such as 2205 deliver roughly twice the strength and strong resistance to chloride stress-corrosion cracking.
Choosing between austenitic and duplex is a balance of corrosion environment, strength, temperature, and cost. We help you select the right grade for the service, then fabricate it with the welding controls that stainless steels demand to preserve their corrosion resistance in the finished equipment.
Stainless Steel Fabrication Done Right
Austenitic stainless steels — the 300 series — combine good corrosion resistance, toughness across a wide temperature range, and excellent formability and weldability. The low-carbon L grades resist sensitization during welding, which is why they are favored for welded vessels. These grades suit a broad range of chemical, pharmaceutical, and food applications where general corrosion resistance is the priority.
Duplex stainless steels have a mixed austenitic-ferritic microstructure that roughly doubles the yield strength of standard austenitic grades while sharply improving resistance to chloride stress-corrosion cracking and pitting. That strength can allow thinner, lighter vessels, and the corrosion resistance makes duplex attractive for chloride-bearing and brackish-water service. Duplex does require disciplined welding to maintain the correct phase balance, which is where fabrication experience matters.
Welding is decisive for stainless steel performance. We use qualified procedures, control heat input and interpass temperature, protect the weld and root with appropriate shielding, and follow with passivation so the finished surface restores its protective oxide layer. For sanitary service we can provide polished interiors that resist fouling and ease cleaning.
Every stainless vessel ships with material test reports tracing the chemistry and mechanical properties of the plate and welding consumables, along with the weld and NDE records. This traceability is essential in regulated industries and protects the integrity of the corrosion-resistant construction you specified.
Why Choose Roben Manufacturing
- Both austenitic and duplex capability. We fabricate the full range of austenitic and duplex grades and help you choose the right one for the service.
- Welding that preserves corrosion resistance. Qualified procedures, heat-input control, and passivation keep the finished equipment as corrosion-resistant as the base metal.
- Strength-to-weight advantage with duplex. Duplex grades can yield thinner, lighter vessels where strength and chloride resistance are needed.
- Sanitary finishes available. Polished interiors are available for pharmaceutical and food service where cleanability matters.
- Full material traceability. Mill test reports and weld records document the chemistry and integrity of every vessel.
Key Features & Capabilities
- 304/304L and 316/316L austenitic stainless fabrication
- 2205 and other duplex stainless fabrication
- Grade selection for corrosion, strength, and temperature
- Low-carbon L grades to resist weld sensitization
- Controlled heat input and interpass temperature for duplex
- Inert-gas shielding and root protection during welding
- Post-weld passivation to restore the protective oxide layer
- Polished interiors for sanitary service
- Pickling and surface treatment as required
- Full mill test reports and weld documentation
Applications & Industries Served
- Chemical process reactors and vessels
- Pharmaceutical and biotech process equipment
- Food and beverage processing vessels
- Chloride-bearing and brackish-water service (duplex)
- Storage and process tanks requiring corrosion resistance
- Heat exchangers in corrosive duties
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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