ASTM A276 Grade 321 stainless steel is a titanium-stabilized austenitic stainless steel designed to provide excellent resistance to intergranular corrosion after welding and superior oxidation resistance at elevated temperatures.

Advantages Compared with Other Stainless Steel Bars

321 stainless steel is often selected when components are exposed to continuous high temperatures or repeated thermal cycles. Compared with other common stainless steel grades, it offers distinct benefits.

Key Benefits of 321 Stainless Steel Round Bar

• Excellent resistance to intergranular corrosion
• Outstanding oxidation resistance at elevated temperatures
• Good creep resistance
• Superior weldability without post-weld stabilization treatment
• Excellent toughness at both high and low temperatures
• Good machinability and fabrication performance
• Stable mechanical properties during long-term thermal exposure
• Long service life in demanding industrial environments

• Petrochemical plants
• Heat exchangers
• Boiler components
• Pressure vessels
• Furnace equipment
• Expansion joints
• Exhaust manifolds
• Aircraft exhaust systems
• Thermal processing equipment
• Oil & gas facilities
• Heavy industrial machinery
• High-temperature pipelines

321 is a titanium-stabilized austenitic stainless steel that offers excellent resistance to intergranular corrosion and oxidation at elevated temperatures. It is widely used for welded structures and components operating under continuous heat.

The primary difference is the addition of titanium (Ti) in 321 stainless steel. Titanium stabilizes the material, preventing chromium carbide precipitation during welding or prolonged exposure to temperatures between approximately 425°C and 850°C, making 321 more suitable for high-temperature service.

It depends on the application.

• 321 is recommended for high-temperature equipment, exhaust systems, boilers, and heat exchangers.
• 316L is recommended for marine environments, chemical processing, and chloride-rich applications because of its molybdenum content, which provides superior pitting and crevice corrosion resistance.

321 stainless steel offers excellent oxidation resistance up to approximately 870°C for intermittent service and 925°C for continuous service. Actual allowable service temperatures depend on the specific operating conditions and design requirements.

Yes. 321 stainless steel has excellent weldability and is suitable for TIG, MIG, resistance, and other conventional welding processes. In most cases, post-weld heat treatment is not required.

We supply 321 stainless steel round bars in diameters from 3 mm to 300 mm, with standard lengths of 3 m and 6 m. Custom sizes and cut-to-length services are also available.

Available finishes include:

• Hot Rolled
• Bright Drawn
• Peeled
• Centerless Ground
• Polished

Yes. Every shipment can be supplied with an EN 10204 3.1 Mill Test Certificate. Third-party inspections by SGS, TÜV, BV, or other internationally recognized agencies are available upon request.

Yes. We offer:

• Precision cutting
• CNC machining
• Turning
• Grinding
• Threading
• Chamfering
• Drilling
• OEM manufacturing according to customer drawings

• Over 18 years of manufacturing and export experience
• Manufactured in accordance with ASTM A276 and international standards
• Large inventory for fast delivery
• Complete size range from 3 mm to 300 mm
• Strict quality control with comprehensive testing
• EN 10204 3.1 MTC and third-party inspection available
• OEM and custom machining services
• Competitive factory-direct pricing
• Professional export packaging and worldwide logistics support