What is 309S (UNS S30908) Stainless Steel

309S (UNS S30908, 1.4828, SUS309S) is a high-Cr-Ni austenitic stainless steel, designed for excellent high-temperature oxidation resistance.

UNS: S30908|JIS: SUS309S|GB: 06Cr23Ni13|EN: X5CrNi23-12

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

	309	309S	309H
	22.0 min.-24.0 max.	22.0 min.-24.0 max.	22.0 min.-24.0 max.
	12.0 min.-15.0 max.	12.0 min.-15.0 max.	12.0 min.-15.0 max.
	0.20	0.08	0.04 min.-0.10 max.
	2.00	2.00	2.00
	0.045	0.045	0.045
	0.030	0.030	0.030
	0.75	0.75	0.75

Key Properties (20℃, Annealed, Horizontal)

Density: 7.98g/cm³|Melting Point: 1400-1450℃|Tensile Strength: >=515N/mm²|0.2% Yield Strength: >=205N/mm²|Elongation: >=40%|Hardness (HB): <=217

Superior high-temperature oxidation resistance (up to 1050℃); good high-temperature creep strength; excellent weldability; suitable for industrial furnaces and high-temp oxidizing environments.

304 vs 309S (Horizontal)

Cr Content: 304 (18.00-20.00%)|309S (22.00-24.00%)|High-Temp Service: 304 (<=870℃)|309S (<=1050℃)|Oxidation Resistance: 304 (Good)|309S (Excellent)

 

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.