309S Stainless Steel Plate

309S Stainless Steel Plate is a high-quality austenitic stainless steel known for its excellent resistance to oxidation and corrosion, especially in high-temperature environments. It is designed to withstand extreme conditions and is widely used across industries requiring reliable material performance. The low carbon content in the 309S grade reduces the risk of carbide precipitation during welding, ensuring high weldability.

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Product Introduction

309S Stainless Steel Plate thrives where temperatures soar-up to 1.100°C (2.012°F). With a chromium-nickel balance (23% Cr, 13% Ni) optimized for cyclic heating, it resists scaling, carburization, and sulfidation in furnaces, exhaust systems, and pyrolysis units. A cost-effective alternative to 310S and Inconel, it's the backbone of industries where thermal shock is a daily challenge.

Why 309S Outperforms in Red-Hot Conditions

Oxidation Shield

Forms a stable Cr₂O₃ layer at 900°C+ (50% slower scaling vs. 304H).

Thermal Fatigue Fighter

Survives 5.000+ rapid heat-cool cycles (ASTM E606 verified).

Carburization Barrier

Blocks carbon ingress in ethylene cracker tubes (API 934 compliant).

Weld-Safe Design

Low carbon (0.03% max) prevents HAZ cracking in high-heat joints.

Critical High-Temp Metrics

Property	309S Plate	Competitor (310S)
Max Continuous Temp	1.100°C (with <0.1% scaling/year)	1.150°C (higher cost per °C gain)
Thermal Conductivity	14.9 W/m·K @ 500°C	13.4 W/m·K (slower heat dispersion)
Cyclic Endurance	5% weight loss after 1.000h @ 950°C	7% weight loss (same conditions)
Cost Efficiency	$6.2/kg (12mm annealed)	$9.8/kg (25% premium for 50°C gain)