Stainless Steel Sheet and Plate – 309

stainlesssteelgroupcom 309 stainless steel sheet

SS 309 Sheet and Plate is an austenitic chromium-nickel alloy which offers excellent corrosion resistance, heat tolerance, high strength at elevated temperatures, easy machining capabilities and excellent weldability.

This multifaceted alloy can be found in applications like heat exchangers, medical instruments and kitchenware – often performing admirably in demanding environments where corrosion resistance is key.

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309 stainless steel is a hard, corrosion-resistant alloy used in various applications. It excels in high temperature environments – up to 2000 degrees Fahrenheit can withstand its extreme temperatures – which makes it suitable for use in petrochemical, oil, and gas industries. 309 stainless steel is also commonly utilized in the construction industry, where it should be combined with other corrosion-resistant alloys to achieve optimal results. 309’s corrosion resistance stems from its ability to form dense passive layers on its surface that serve as protection. This layer serves to protect the metal against corrosion-inducing substances as well as chemical attack from other sources. In order to keep this passive layer intact, proper surface cleaning using abrasive pads, brushing, pickling or spraying must occur regularly and etching of surfaces must be avoided as this could compromise their protective layer.

Compare 309 stainless steels to other austenitic grades of austenitic stainless steels and it stands out for its corrosion resistance and strength, due to its high content of chromium, nickel and low carbon content. Type 309 offers good resistance against sulfur attacks at higher temperatures while it does well reducing or nitriding environments.

Grade 309 can be joined together using shielded fusion and resistance welding methods; however, due to its low carbon content it should not be welded with oxyacetylene. When welds are needed postweld annealing is highly recommended to restore corrosion resistance properties and restore corrosion resistance properties.

Grade 309 stainless steel can be cold worked and rolled into bars or sheets using cold working methods, formed and drawn into complex shapes, as well as being cold-worked slightly magnetic when cold-worked with sharp tools to avoid work hardening. Furthermore, its properties allow it to be easily cold worked into bars or sheets using cold working techniques or cold rolling or rolling as sheet stock; formed into complex shapes using stamping; it may even need in-process annealing in order to decrease hardness and increase ductility during these processes.


Stainless steel 309 is an iron-nickel austenitic alloy with impressive corrosion resistance and strength properties, thanks to its high content of chromium and nickel, providing exceptional elevated temperature strength, resistance to oxidation, stress rupture properties, as well as exceptional intergranular corrosion resistance and intergranular corrosion protection. In addition, its superior creep strength at elevated temperatures ensures it has excellent creep strength properties.

Grade 309 is an extremely versatile material suitable for numerous applications, from chemical processing and heat treatment equipment to construction. As it features low carbon content and good weldability and formability properties, Grade 309 makes an excellent choice when required to perform under elevated temperature environments.

Grade 309 typically exhibits superior tensile, creep, and ductility characteristics than grade 304 at elevated temperatures, as well as being more resistant to carburization than its counterpart. Furthermore, due to its higher content of chromium and nickel, grade 309 provides better resistance against sulfur attacks at elevated temperatures.

309 and 309S steel grades differ by virtue of having lower carbon contents, which helps prevent carbide precipitation and enhance weldability. Both grades are nonmagnetic when annealed but become slightly magnetic after cold working; both can be rolled, formed, stamped and drawn; they can even be welded using either resistance or fusion welding techniques.

Penn Stainless carries Alloy 309 and 309S products such as sheets, strip coils, plates, round bars, processed flat bars and tubular products in sheets, strip coils, plates, round bars processed flat bars and tubular products for high temperature applications where oxidation resistance and strength are of critical importance. They boast exceptional oxidation resistance as well as superior corrosion resistance with higher creep strength at elevated temperatures than other stainless steels – they are insusceptible to chromium carburization while having superior oxidation resistance than Type 304 as well. However they should be avoided when used in hydrogen sulfide environments as they cannot oxidize under these circumstances.


Stainless Steel sheet 309 is an austenitic heat resistant alloy designed to withstand higher-temperature applications. This austenitic alloy exhibits excellent oxidation resistance and strength at elevated temperatures while being tough and ductile enough for resistance and fusion welding methods without losing corrosion resistance properties. Cold working can also take place without compromise to corrosion resistance properties.

309 stainless steel’s high chromium content contributes to its ability to resist sulfur attack at elevated temperatures and moderate resistance to carbon absorption, making it an excellent choice for applications involving frequent thermal cycling.

309 stainless steel has a lower melting point than other grades of stainless steel, minimizing its exposure to embrittlement during welding. However, for optimal results it still requires careful preparation of the weld area in order to produce clean and smooth welds; additionally it should use shielded welding methods which protects it from oxidation or contamination by nitrogen oxides.

A stainless steel weld shop should stock a selection of electrodes to meet various welding applications. For instance, those specializing in pressure vessel welding might opt for metal cored ferritic stainless steel electrodes with higher chromium and nickel contents to increase weldability and corrosion resistance while remaining easy to machine.

Contrary to some other grades of stainless steel, 309 is non-magnetic when annealed and becomes only slightly magnetic when cold worked – an advantage when applied in environments hostile to magnetic material, such as marine environments.

Penn Stainless offers Alloy 309/309S in sheet, plate, round bar and processed flat bar form for welding by most conventional means, including arc and gas welding. This grade features higher nickel levels with lower carbon levels to enhance its weldability compared to 304 stainless.

Alloy 309/309S is an austenitic chromium-nickel alloy with excellent resistance to oxidation, heat resistance and strength at room and elevated temperatures. Weldable with resistance or fusion methods; however oxyacetylene welding should not be attempted.


SS 309 provides improved corrosion resistance than its more widely utilized cousin 304 grade, as well as excellent weldability – making it a popular choice for use in pipe systems and manufacturing equipment. Furthermore, this alloy can withstand sulfur-containing environments without discoloring, although not recommended for carburizing applications due to poor carbon retention which causes fast oxidization rates under these circumstances.

Stainless Steel Grade 309 is an austenitic metal composed of approximately 22% chromium and 11% nickel, as well as small amounts of molybdenum for enhanced resistance against corrosion, particularly in harsh environments. Furthermore, its lower carbon content allows easier welding.

Alloy 309 has many applications, from automotive exhaust systems to medical instruments and kitchenware. Due to its combination of mechanical strength and corrosion resistance, Alloy 309 is ideal for high temperature environments.

Grade 309 stainless steel comes in various forms, such as welded pipe, seamless tube, bar wire and sheet plate. Arch City Steel & Alloy of Fenton Missouri is one of the country’s top distributors and can offer grade 309 in various dimensions and lengths as well as custom cuts to meet specific needs.

Price-wise, grade 309 stainless steel is comparable to grade 304. However, its main difference lies in its greater resistance to corrosion at higher temperatures compared to low heat applications (304 being more suitable in that regard). Grade 309 also makes an excellent choice for dissimilar welding metals due to its ability to withstand higher heat without sensitization issues.

Dhanlaxmi Steel Industry is an acclaimed producer, supplier, and stockist of superior quality SS 309 Plates that are manufactured using top quality material sourced from reliable market vendors. All plates undergo strict quality tests according to international standards – this includes positive material identification test, hardness test, intergranular corrosion test and macro-micro test for quality assurance purposes. Furthermore, each plate is custom fabricated according to individual client specifications using modern tools and technology for fabrication.

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