309S stainless steel plate

ASTM A240 Types 309 Stainless Steel and ASTM A240 309S are austenitic chromium-nickel stainless steels that provide excellent corrosion resistance and heat resistance plus good strength at room and elevated temperatures. ASTM A240 Type 309S Stainless Steel is identical to Type 309 except for a lower carbon content that minimizes carbide precipitation and improves weldability. They are essentially nonmagnetic as annealed and become lightly magnetic when cold worked.

 

Q: What is 309S stainless steel plate?

A: Austenitic stainless steel (22-24% Cr, 12-15% Ni, ≤0.08% C), featuring excellent high-temperature oxidation resistance and corrosion resistance, ideal for elevated-temperature service.

 

Q: What are its key mechanical properties?

A: Tensile strength: 515-700 MPa; Yield strength: ≥205 MPa; Elongation: ≥40%; Hardness (HB): ≤217; Stable performance at 800-1000°C.

 

Q: What applications is it suited for?

A: High-temperature equipment, furnace liners, heat exchangers, welding filler metals, and industrial components exposed to continuous high heat or mild corrosion.

 

Q: Which international standards govern it?

A: ASTM A240 309S, JIS G4305 SUS309S, GB/T 3280 06Cr23Ni13, EN 10088-2 X5CrNi23-12.

 

Q: How does it differ from 304 stainless steel?

A: 309S has higher chromium/nickel content (22-24% Cr vs. 18% for 304), superior high-temperature oxidation resistance, and better corrosion resistance in high-heat environments (higher cost than 304).