309/309S Stainless Steel Pipe

309S/309 stainless steel (UNS S30900/S30908) austenitic stainless steel is typically used for elevated temperature applications. Its high chromium and nickel content provides comparable corrosion resistance, superior resistance to oxidation, and the retention of a larger fraction of room temperature strength than the common austenitic Alloy 304.

309 stainless steel (UNS S30900) is an austenitic stainless steel developed for use in high temperature corrosion resistance applications. 309 stainless steel resists oxidation up to 1900°F (1038°C) under non-cyclic conditions. Frequent thermal cycling reduces oxidation resistance to approximately 1850°F (1010°C).

Because of its high chromium and low nickel content, 309 stainless steel can be utilized in sulfur containing atmospheres up to 1832°F (1000°C). The alloy is not recommended for use in highly carburizing atmospheres since it exhibits only moderate resistance to carbon absorption. Alloy 309 can be utilized in slightly oxidizing, nitriding, cementing and thermal cycling applications, albeit, the maximum service temperature must be reduced.

When heated between 1202 - 1742°F (650 - 950°C) the alloy is subject to sigma phase precipitation. A solution annealing treatment at 2012 - 2102°F (1100 - 1150°C) will restore a degree of toughness.

309S (UNS S30908) is the low carbon version of the alloy. It is utilized for ease of fabrication. 309H (UNS S30909) is a high carbon modification developed for enhanced creep resistance. It most instances the grain size and carbon content of the plate can meet both the 309S and 309H requirements.

309 stainless steel can be easily welded and processed by standard shop fabrication practices.

Type: Seamless / Welded

Technical: Hot Rolled/ Cold Drawn

Outside Diameter: 4-720mm

Thickness: 0.5mm-68mm

Length: Up to 12 meters

Section Shape: Round/Square/Rectangular/Oval/Bending/Special Section

Surface: Satin(400g),Hairline(400g),Mirror(800g),Polished,Mill surface

Standard: ASTM/ASME A312/A213/A269/A789/A511/A376/B829 Etc.