JIS G4305 SUS 309S Cold Rolled Stainless Steel Coil Supplier

SUS309S Cold Rolled Stainless Steel Coil & Sheet | JIS G4305 309S Stainless Steel Strip Manufacturer & Exporter – Gangsteel

Gangsteel is a premier manufacturer and global exporter of premium JIS G4305 SUS309S cold rolled stainless steel coils, sheets, and strips. As a high-chromium, high-nickel austenitic grade (Grade 309S or UNS S30908), SUS309S excels in elevated-temperature service with outstanding oxidation resistance up to 1900°F (1038°C) under non-cyclic conditions, superior scaling resistance, and good strength retention at high temperatures. The low carbon content (≤0.08%) and high alloy levels (22-24% Cr, 12-15% Ni) make it ideal for cyclic heating applications where intergranular corrosion must be minimized.

Our advanced cold rolling facilities produce SUS309S 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 309S, EN 1.4833 (X12CrNi23-13), and GB 0Cr23Ni13 or 06Cr23Ni13, Gangsteel's SUS309S products serve demanding industries worldwide including furnace components, heat exchangers, petrochemical processing, power generation, annealing covers, and high-temperature fabrication.

This comprehensive product introduction details every aspect of our JIS G4305 SUS309S cold rolled stainless steel — from composition and properties (in tables) to manufacturing, applications, advantages, and why Gangsteel is your trusted partner for reliable, heat-resistant supply.

Introduction to SUS309S Stainless Steel

SUS309S is a heat-resisting austenitic stainless steel designed for continuous high-temperature service. With significantly higher chromium and nickel than standard 304/316 grades, it forms a stable, protective chromium oxide scale that resists oxidation, carburization, and sulfidation in oxidizing atmospheres up to 1900°F (1038°C) non-cyclic, or ~1850°F (1010°C) cyclic. The low carbon content enhances weldability and resistance to intergranular corrosion after exposure to sensitization temperatures.

Non-magnetic in the annealed state, SUS309S provides good creep strength, thermal fatigue resistance, and moderate corrosion resistance in mildly aggressive environments. Gangsteel specializes in cold rolled SUS309S, optimizing it for forming, welding, and polishing in furnace and thermal processing equipment.

Chemical Composition of JIS G4305 SUS309S

Chemical Composition Table

Gangsteel's production maintains high Cr/Ni levels and low C for superior scaling and carburization resistance. Full chemical analysis and EN 10204 3.1 certificates are standard.

Mechanical Properties

In annealed condition per JIS G4305:

Mechanical Properties Table (Annealed)

SUS309S retains useful strength and ductility at high temperatures, with good creep resistance.

Physical Properties

Physical Properties Table

These properties support excellent thermal cycling in furnace and heat-treatment applications.

Equivalent Materials Comparison

Equivalent Materials Comparison Table

SUS309S provides better high-temperature oxidation resistance than SUS304 or 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 superior 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 SUS309S Cold Rolled Products

SUS309S excels in high-temperature oxidizing environments:

Furnace and Heat Treatment

• Annealing covers/boxes, radiant tubes, muffles
• Furnace fans, shafts, retorts

Petrochemical and Power Generation

• Waste incinerators, pulverized coal burners
• Boiler tube hangers, calciners

Chemical Processing

• Brazing fixtures, lead pans, neutral salt pots
• High-temp chemical equipment

Other High-Temp Uses

• Glass forming equipment, thermowells
• Paper mill equipment, rotary kilns

Its oxidation resistance suits continuous or cyclic high-heat service.

Advantages of Choosing SUS309S Stainless Steel

• Outstanding oxidation and scaling resistance up to 1900°F (1038°C)
• Good sulfidation and carburization resistance
• Moderate strength retention at elevated temperatures
• Weldable with good IGC resistance (low C)
• Formable and fabricable for complex shapes
• Better high-temp performance than SUS304/316
• Recyclable and cost-effective for heat applications

Corrosion and Oxidation Resistance

Forms stable Cr oxide scale; resists oxidation, carburization, and sulfidation in oxidizing atmospheres. Good in mild corrosives; not for severe chlorides (use 316/317). Oxidation resistance ~1900°F non-cyclic, ~1850°F cyclic.

Weldability and Fabrication

Good weldability with TIG/MIG; low C minimizes sensitization. Use ER309/ER309L fillers. High ductility supports forming; annealing may be needed post-weld for critical uses.

Why Choose Gangsteel for SUS309S 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/oxidation 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 Heat-Resistant SUS309S Solutions

SUS309S Cold Rolled Stainless Steel Coil & Sheetfrom Gangsteel, produced to JIS G4305, delivers exceptional high-temperature oxidation resistance, durability, and reliability for furnace and thermal 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 SUS309S cold rolled stainless steel coils, sheets, and strips. Trust us for premium high-chromium, heat-resisting stainless solutions.