Stainless Steel Alloy 309S

Type 309S stainless steel is a low carbon version of Type 309. Because of its lower carbon-content, Type 309S minimizes carbide precipitation, and improves weldability.  Other key properties of Type 309S include:

It can be easily roll formed, stamped and drawn

Higher resistance to marine atmospheres than Type 304

Good weldability and machinability

Outstanding resistance to oxidation

Because of these and other benefits, Type 309S is utilized by many different industries for a number of critical applications including:

Oven Linings

Boiler baffles

Firebox sheets

Furnace components

Most high temperature containers

Aircraft and jet engine parts

Heat exchangers

Auto exhaust parts

Refinery and chemical processing equipment

One reason for these unique properties is Type 309S’s specific chemical make-up that includes:

Fe balance

Cr 23%

Ni 14%

Mn 2%

Si 1%

C 0.08%

P 0.045%

S 0.030%

Sino Special Metal has supplied many customers with Type 309S stainless steel over our 20 year history.  Type 309S is available in a number of different sizes and forms including sheet, sheet coil, plate, round bar, flat bar, and tube. As with all of the products we supply, Type 309S meets the leading standards like ASTM, AMS, AISI, UNS, and DIN.