Grade 309 / 309S are austenitic chromium-nickel stainless steels, which are often used for high temperature applications. Due to their high chromium and nickel content, Grade 309 / 309S pipes are highly corrosion resistant, and have outstanding resistance to oxidation. Also, they exhibit excellent heat resistance while providing good strength at ambient or elevated temperatures. However, the only significant difference between 309 and 309S is the carbon content. Grade 309S stainless steel pipes have a much less carbon composition, which minimizes carbide precipitation, and improves weldability.
Grade 309 / 309S are austenitic chromium-nickel stainless steels, which are often used for high temperature applications. Due to their high chromium and nickel content, Grade 309 / 309S pipes are highly corrosion resistant, and have outstanding resistance to oxidation. Also, they exhibit excellent heat resistance while providing good strength at ambient or elevated temperatures. However, the only significant difference between 309 and 309S is the carbon content. Grade 309S stainless steel pipes have a much less carbon composition, which minimizes carbide precipitation, and improves weldability.
Heat Treatment
They cannot be hardened through heat treatment because they consist solely of austenite at room temperature
Higher tensile and yield strengths can be obtained through cold working
Fabrication
Can be roll formed, stamped, and drawn readily
In process annealing is often required to reduce hardness and increase ductility
Applications
309 / 309S stainless steel pipes and tubes are used exclusively for their excellent oxidation resistance, and strength at high temperatures. Additionally, they offer good resistance to creep deformation and extreme environment. Some examples include, but are not limited to:
Heating elements
Aircraft and jet engine parts
Heat exchangers
Carburizing annealing products
Sulfite liquor handling equipment
Kiln liners
Boiler baffles
Refinery and chemical processing equipment
Auto exhaust parts
In 2016, it signed a strategic cooperation agreement with major domestic stainless steel factories for the sales of medium and heavy plates and special steel products, which also enabled the company to have new and brighter sales varieties. At the same time, it provides one-stop service for cutting, cutting, forming and and surface processing of stainless steel.
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