309 Stainless Steel 309 Stainless Steel Supplier At Stainless Shapes, we provide the highest quality stainless steel. We are a proud 309 Stainless Steel supplier. Alloys 309 and 309S are austenitic chromium-nickel steel. They are used for higher temperature applications. They have a high corrosion resistance due to their high chromium and nickel content. Alloys 309 and 309S are highly corrosion-resistant. Furthermore, they have outstanding oxidation resistance and excellent heat resistance while providing good strength at room and elevated temperatures. Alloy 309S has a much lower carbon composition, which minimizes carbide precipitation and improves weldability. Features of 309 Stainless Machinability: This alloy machines similarly to type 304 stainless. The stringy chips produced by this material rapidly cause work hardening. To maintain optimal forming, it is essential to keep the cutting tools engaged and use chip breakers. Welding: Welding Grade 309 stainless steel requires fusion or resistance welding methods to achieve optimal hardness. Avoid using the oxyacetylene welding method. Formability: Grade 309/S stainless steel can be easily roll-formed, stamped, and drawn. Annealing may be necessary to reduce hardness and enhance ductility. This type remains stable and non-magnetic even after cold working. Its lower elongation makes it more challenging to form compared to other Austenitic 300 grades. Not Sure What You are Looking For? Contact us if you are unsure of what you are looking for. Stainless can be a tricky business to deal with unless you have the right experts to speak with. Our salesmen are on the line in Florida and Illinois, and they are ready to answer your calls and get you up and running with your stainless of choice. If you have any questions about our product line, our company, or what kind of stainless steel will go best with the job you need to be done, give us a call today at (800) 748-9811 Furthermore, for a prompt and accurate quote, call us today. Call - 800-748-9811 Frequently Asked Questions What is the difference between 304 and 309 stainless steel? + Grade 309 contains 22-24% chromium and 12-15% nickel -- significantly more than 304 (18% Cr, 8% Ni) -- providing superior high-temperature oxidation resistance. While 304 is rated to approximately 870 C (1600 F), 309 handles continuous service to 1095 C (2000 F) in air, making it ideal for furnace components, kiln liners, and heat-treatment fixtures. What is 309 stainless used for? + Grade 309 is used in furnace parts and liners, kiln hardware, heat-treatment fixtures, radiant tubes, thermocouple protection tubes, oven components, automotive catalytic converter substrates, and any application requiring sustained performance above 900 F where lower grades would oxidize excessively. Which stainless steel is the highest quality? + Within the austenitic family, super-austenitic grades like 904L and 254 SMO offer the highest corrosion resistance. For high-temperature service, 309 and 310 are top-tier performers. The highest quality depends entirely on the performance criterion being evaluated. What is the cheapest grade of stainless steel? + The most economical standard stainless grades are 409 and 430 (ferritic, minimal nickel). Among austenitic grades, 304 is the most economical entry point. Grade 309 is more expensive than 304 due to its higher chromium and nickel content. Is 309 stainless steel magnetic? + Grade 309 is austenitic and non-magnetic in the annealed state, similar to 304 and 316. Some cold-worked 309 may exhibit slight magnetism, but it is fundamentally non-magnetic. What's stronger, 304 or 316 stainless? + In standard conditions 304 and 316 have similar tensile strength (~75-80 ksi annealed). At elevated temperatures, 309's higher alloy content allows it to significantly outperform both 304 and 316. The choice between 304 and 316 at room temperature is about corrosion resistance, not tensile strength. What is the best grade of steel for grills? + For grills, Grade 304 is most commonly specified for its combination of heat resistance, corrosion resistance to food acids, and cost. Grade 309 is sometimes used for commercial grill fireboxes or burner components exposed to the highest temperatures. What are the key differences between stainless steel 309 and 310? + Grade 309 contains 22-24% Cr and 12-15% Ni; Grade 310 contains 24-26% Cr and 19-22% Ni. The higher alloy content of 310 gives it better high-temperature oxidation resistance -- 310 is rated approximately 100 F higher in continuous service temperature than 309. How can I tell if my stainless steel is 304 or 316? + Without testing equipment, 304 and 316 are visually indistinguishable. XRF analysis is the reliable field method. Check mill certifications (CMTRs) for the grade designation. Stainless Shapes provides full CMTRs with all orders. Is 308 or 309 better for stainless steel? + Grade 308 filler is used to weld 304 and similar austenitic bases; Grade 309 filler (ER309) is used to weld 309 base metal or to make dissimilar welds between stainless and carbon steel.
