JIS G4305 SUS 321 Cold Rolled Stainless Steel Coil Supplier

SUS321 Cold Rolled Stainless Steel Coil & Sheet | JIS G4305 321 Stainless Steel Strip Manufacturer & Exporter – Gangsteel

Gangsteel is a leading manufacturer and global exporter of premium JIS G4305 SUS321 cold rolled stainless steel coils, sheets, and strips. As a titanium-stabilized austenitic grade (Grade 321 or UNS S32100), SUS321 provides excellent resistance to intergranular corrosion after welding or prolonged exposure to temperatures in the 425–815°C (800–1500°F) range, due to titanium stabilization (Ti ≥ 5 × (C + N)). It combines the superior general corrosion resistance of 18/8 chromium-nickel steels with enhanced high-temperature performance, making it ideal for applications involving heat, welding, and moderate corrosives.

Our advanced cold rolling facilities produce SUS321 with high-quality surface finishes (2B, BA, No.4, HL, Mirror), tight tolerances (±0.02 mm), and consistent properties fully compliant with JIS G4305 (Cold-rolled stainless steel plate, sheet and strip). Equivalent to ASTM A240 Type 321, EN 1.4541 (X6CrNiTi18-10), and GB 06Cr18Ni11Ti or 1Cr18Ni9Ti, Gangsteel's SUS321 products serve industries worldwide including aerospace, chemical processing, heat exchangers, exhaust systems, furnace parts, and high-temperature welded equipment.

This comprehensive product introduction details every aspect of our JIS G4305 SUS321 cold rolled stainless steel — from composition and properties (in tables) to manufacturing, applications, advantages, and why Gangsteel is your trusted partner for reliable, high-temperature supply.

Introduction to SUS321 Stainless Steel

SUS321 is an austenitic chromium-nickel stainless steel stabilized with titanium to bind carbon and prevent chromium carbide precipitation at grain boundaries during welding or service in the sensitization range (425–815°C). This stabilization provides superior intergranular corrosion (IGC) resistance compared to unstabilized grades like SUS304, while maintaining excellent general corrosion resistance in atmospheric, mild chemical, and organic environments.

Non-magnetic in the annealed state, SUS321 offers good toughness at cryogenic temperatures, oxidation resistance up to ~870°C intermittent, and moderate strength at elevated temperatures. Gangsteel specializes in cold rolled SUS321, optimizing it for deep drawing, stamping, bending, polishing, and welding in heat-exposed corrosive applications.

Chemical Composition of JIS G4305 SUS321

Chemical Composition Table

Gangsteel's production ensures proper Ti stabilization and low C for optimal high-temperature IGC resistance. Full chemical analysis and EN 10204 3.1 certificates are standard.

Mechanical Properties

In annealed condition per JIS G4305:

Mechanical Properties Table (Annealed)

SUS321 maintains moderate strength and good ductility at elevated temperatures.

Physical Properties

Physical Properties Table

These properties support excellent thermal cycling in heat exchangers and exhaust systems.

Equivalent Materials Comparison

Equivalent Materials Comparison Table

SUS321 offers better IGC resistance at high temperatures than SUS304 or unstabilized 316.

Manufacturing Process: Cold Rolled at Gangsteel

Gangsteel's process: hot rolling to intermediate thickness, annealing/pickling, multi-pass cold reduction in precision mills, final bright annealing/skin pass, slitting/edge trimming. Thickness: 0.3–3.0 mm (coils/sheets). Width: 600–1524 mm. In-line controls ensure tight tolerances and defect-free surfaces.

Finishes: 2B (standard matte), BA (bright annealed), No.4/HL (brushed), Mirror. Protective films and custom slitting available.

Available Forms, Sizes, and Specifications

• Cold rolled coils: 0.3–3.0 mm thick, up to 1524 mm wide
• Cold rolled sheets: Cut-to-length up to 6000 mm
• Strips: Narrow from 10 mm

Compliant with JIS G4305; optional ASTM A240/EN cross-certification. Tolerances per JIS or tighter.

Key Applications of SUS321 Cold Rolled Products

SUS321 excels in high-temperature, welded corrosive environments:

Aerospace and Exhaust Systems

• Aircraft exhaust manifolds, stacks, jet engine parts
• Automotive exhaust tubing

Chemical and Petrochemical

• Heat exchangers, furnace parts, welded piping
• High-temperature chemical processing

Power Generation and Industrial

• Boiler tubes, thermal processing equipment
• Expansion joints, bellows

Food and Pharmaceuticals

• Heat exchangers in hygienic service
• Welded structures requiring heat stability

Its Ti stabilization suits prolonged elevated-temperature exposure.

Advantages of Choosing SUS321 Stainless Steel

• Excellent intergranular corrosion resistance in 425–815°C range
• Good general corrosion resistance in mild environments
• Superior high-temperature strength and oxidation resistance
• Weldable without post-weld annealing in most cases
• Good formability and polishability
• Non-magnetic annealed; recyclable
• Better sustained heat performance than SUS304

Corrosion and Oxidation Resistance

Forms stable Cr oxide layer; resists atmospheric, mild acids, and organics. Ti prevents IGC in sensitized range. Oxidation resistance up to ~870°C intermittent.

Weldability and Fabrication

Excellent weldability with TIG/MIG/resistance; Ti stabilization eliminates sensitization. Use ER321 or ER347 fillers. High ductility supports complex forming.

Why Choose Gangsteel for SUS321 Cold Rolled Coils and Sheets?

• Precision cold rolling with advanced mills
• Strict JIS G4305 compliance and traceability
• Diverse finishes/stock for fast delivery
• Competitive pricing, flexible MOQ
• Export to 60+ countries with seaworthy packaging
• Technical support: high-temp/welding advice, specs
• ISO 9001 certified; third-party inspections (SGS/BV/TUV)

Quality Assurance and Certifications

Batch testing: chemical, mechanical, surface, dimensional. MTRs with heat traceability. Audits welcomed.

Packaging, Shipping, and Logistics

Coils eye-to-sky/wall on pallets, waterproof/edge-protected. Sheets skidded. Container/bulk with tracking/insurance.

Conclusion: Partner with Gangsteel for High-Temp SUS321 Solutions

SUS321 Cold Rolled Stainless Steel Coil & Sheetfrom Gangsteel, produced to JIS G4305, delivers proven high-temperature stability, IGC resistance, and reliability for heat-exposed applications. As a dedicated manufacturer and exporter, we ensure consistent quality and dedicated service worldwide.

Contact Gangsteel today for competitive quotes, samples, technical data sheets, or custom SUS321 cold rolled stainless steel coils, sheets, and strips. Trust us for premium titanium-stabilized stainless solutions.