309S Stainless Steel Pipe & Tube: High-CrNi Medium-High Temp Oxidation Resistant Piping

What is 309S Stainless Steel Pipe & Tube?

309S is a high-chromium-nickel austenitic stainless steel pipe, engineered with elevated Cr and Ni content to enhance high-temperature oxidation resistance. It serves as a cost-effective solution for medium-high temperature industrial scenarios, balancing performance and economic efficiency.

Equivalent Grades (Horizontal)

UNS: S30908 | JIS: SUS309S | GB: 06Cr23Ni13 | EN: X5CrNi23-12 | W.Nr.: 1.4828

Chemical Composition (wt%, Horizontal)

C: ≤0.08 | Si: ≤1.00 | Mn: ≤2.00 | P: ≤0.045 | S: ≤0.030 | Cr: 22.00-24.00 | Ni: 12.00-15.00 | Fe: Balance

Key Properties (20°C, Annealed, Horizontal)

Density: 7.98g/cm³ | Melting Point: 1400-1450°C | Tensile Strength: ≥515N/mm² | Yield Strength: ≥205N/mm² | Elongation: ≥40% | Hardness: ≤217HB

Core Characteristics

• Excellent high-temperature oxidation resistance: Forms a dense oxide film, enabling long-term service at up to 1050°C in oxidizing atmospheres • Reliable high-temperature creep performance: Resists deformation under cyclic high-temperature stress, ensuring structural stability • Superior weldability and formability: Easy to process into high-temperature components without performance degradation • Cost-efficient alternative to 310S: Suitable for medium-high temp non-severe corrosion scenarios like industrial furnace flues

309S vs 310S Stainless Steel Pipe (Horizontal)

Cr Content: 309S (22.00-24.00%) | 310S (24.00-26.00%) | Ni Content: 309S (12.00-15.00%) | 310S (19.00-22.00%) | High-Temp Limit: 309S (≤1050°C) | 310S (≤1150°C) | Cost: 309S (Medium) | 310S (High)

Element	309	309S	309H
Chromium	22.0 min.-24.0 max.	22.0 min.-24.0 max.	22.0 min.-24.0 max.
Nickel	12.0 min.-15.0 max.	12.0 min.-15.0 max.	12.0 min.-15.0 max.
Carbon	0.20	0.08	0.04 min.-0.10 max.
Manganese	2.00	2.00	2.00
Phosphorus	0.045	0.045	0.045
Sulfer	0.030	0.030	0.030
Silicon	0.75	0.75	0.75
Iron	Balance	Balance	Balance

 

Stainless Steel Suppliers

If you have project requirements for stainless steel, we welcome your order. GNEE has a large inventory of popular products for you to choose from. It can be processed into various practical product forms, including plates, coils, tubes, bars, wires, etc. For detailed chemical composition information and free samples, please contact our factory immediately. We offer competitive prices and excellent service.Email: info@gneestainless.com

 

Testing and Documentation: Factory test certificate, EN 10204 3.1, chemical report, mechanical report, destructive testing report, non-destructive testing report, PMI test report, visual inspection report, third-party inspection report, NABL certified laboratory report.
Packaging: Wooden crate packaging, bubble wrap packaging, steel strapping, or packaging according to customer requirements.