AISI SS 309S / 309H Pipe Fittings,Flanges & Fastener

Made up of chromium-nickel, alloys 309 and 309H are type of stainless steel that is most widely used under high temperature processes. The presence of chromium and nickel in higher concentrations makes them excellent corrosion resistant alloys, also good heat resistant. These alloys hold their strengths in both normal and increased temperatures. The only aspect that differentiates them is the presence of carbon in different ratios. Alloy 309S contains relatively less percentage of carbon and this allows it to control carbide precipitation and provides it with amazing welding properties.
Uses of Alloy 309 and 309S
• In the process of heating different elements
• In the making of aircrafts and jet engines
• Heat exchangers
• In Kiln liners
• Chemical processes
• Refinery apparatus
• Auto exhaust parts
• To carburize annealing products
• In equipment used to control sulfite liquor
Characteristics of SS 309 and SS 309H
• High temperature oxidation resistant
• Maintains strength in higher temperatures
Fine resistance to creep deformation and environmental attacks

Standards

Summary	Standards
Standard Specification for Wrought Austenitic Stainless Steel Piping Fittings	ASTM A 403
Standard Specification for Forged or Rolled Alloy and Stainless Steel Pipe Flanges, Forged Fittings, and Valves and Parts for High-Temperature Service	ASTM A 182

Mechanical Properties – Pipe Fittings

Tensile Strength : Unit – ksi (MPa) , Minimum
Yeild Strength : 0.2 % Offset , Unit – ksi (MPa) , Minimum
Elongation : in 2″, Unit : % , MinimumValues as per ASTM A 403

Condition & Grade	Tensile Strength	Yeild Strength	Elognation Longitudinal	Elognation Transverse
Annealed	75 (515)	30 (205)	28	20

Mechanical Properties – Flanges

Tensile Strength : Unit – ksi (MPa) , Minimum
Yeild Strength : 0.2 % Offset , Unit – ksi (MPa) , Minimum
Elongation : in 2″, Unit : % , Minimum
Reduction Of Area : Unit : % . MinimumValues as per ASTM A 182