SUS309S Stainless Steel

Standard: JIS

SUS309S (UNS S30900/S30908) Austenitic stainless steel is primarily used in high-temperature environments. Its higher chromium and nickel content ensures excellent corrosion and oxidation resistance. Compared to Austenitic 304 alloy, it exhibits slightly higher strength at room temperature.

SUS309S (along with 310/310S Austenitic stainless steel) is commonly used in high-temperature environments. Its higher chromium and nickel content ensure excellent corrosion and oxidation resistance. Compared to Austenitic 304 alloy, it boasts slightly higher strength at room temperature.

Features and Applications:

SUS309S, 23Cr-13Ni high-alloy stainless steel, offering excellent corrosion resistance and strength, suitable for parts operating at temperatures up to 1000°C.

Features - High-alloy stainless steel, with high-temperature acid resistance and strength.

Applications -- Exhaust machinery, heat treatment furnaces, and heat exchangers, etc.

Chemical Composition

Carbon (C): ≤0.08

Silicon (Si): ≤1.00

Manganese (Mn): ≤2.00

Sulfur (S): ≤0.030

Phosphorus P: ≤0.035

Chromium (Cr): 17.00~19.00

Nickel (Ni): 9.00~12.00

Titanium (Ti): ≥5×C%

Tensile Strength σb (MPa): ≥520

Condition yield strength σ0.2 (MPa): ≥205

δ5 elongation (%): ≥40

Section reduction rate ψ (%): ≥50

Hardness: ≤187HB; ≤90HRB; ≤200HV

Heat treatment specifications and metallographic structure:

Heat Treatment Specifications: 1) Austenitize at 920~1150℃ with rapid quenching; 2) Stabilization treatment can be performed as per the buyer's requirements, with heat treatment temperature ranging from 850~930℃, but it must be specified in the contract.

Metallographic Structure: Characterized by an Austenitic microstructure.

Delivery Condition: Generally delivered in heat-treated condition, with the type of heat treatment specified in the contract; if not specified, delivered in non-heat treated condition.