321 Stainless Steel Square Tube

321 stainless steel square tube is an advanced austenitic 18/8 chromium-nickel alloy enhanced with titanium. This specialized variant of stainless steel square tube offers:

• Superior performance at elevated temperatures up to 900°C
• Excellent resistance to intergranular corrosion
• Outstanding toughness at cryogenic temperatures
• Enhanced forming capabilities
• Superior welding characteristics
• Exceptional phase stability

Technical Specifications and Availability

Our 321 stainless steel square tube comes in various specifications:

Size Range:

• Outside Diameter: 6.00mm - 250mm OD
• Thickness: 0.3mm - 50mm
• Schedule options: SCH 5 to XXS

Manufacturing Options:

• Seamless construction
• ERW fabrication
• Welded design
• CDW processing

Surface Finishes:

• 2B finish
• No.4 finish
• No.1 finish
• No.8 mirror finish
• Custom finishes available

Applications and Usage Considerations

Key considerations for 321 stainless steel square tube:

Advantages:

• Ideal for high-temperature environments
• Superior strength at elevated temperatures
• Excellent scaling resistance
• Good aqueous corrosion resistance

Limitations:

• Not recommended for decorative applications
• Titanium transfer limitations in welding
• Grade 347 recommended as welding consumable

Quality Assurance

Each 321 stainless steel square tube undergoes rigorous testing:

• Mill test certification
• EN 10204 3.1 compliance
• Chemical analysis
• Mechanical testing
• PMI verification
• Visual inspection
• Third-party verification
• NABL approved testing

Grade Comparison

When selecting stainless steel square tube grades:

• 321H: Higher carbon content for improved high-temperature strength
• 304L: Alternative for lower temperature applications
• 347: Preferred for welding consumables

Contact our technical team for guidance in selecting the optimal stainless steel square tube grade for your specific temperature and performance requirements.