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409 Stainless Steel Price – June 2025 409 stainless steel Sheet might be exactly what you need. Widely used in automotive exhausts, industrial setups, and structural applications, it offers a great balance between performance and price.   Grade 409 is a titanium-stabilised ferritic stainless steel. Although regarded as a general-purpose chromium stainless steel the almost exclusive application for Grade 409 is automotive exhaust systems. Its applications are those where appearance is a secondary consideration to mechanical properties and corrosion resistance, particularly at high temperatures, and where some weldability is required.   The generic grade 409 has now been replaced in some ASTM specifications (notably the flat rolled specification ASTM A240M) by several “sub-grades”, designated S40910, S40920 and S40930. These have various degrees of stabilisation with titanium, niobium or both titanium and niobium. Any of these may be certified as S40900 (Grade 409). By contrast only standard Grade 409 is listed in ASTM A268M covering tube   This grade is often used in applications where appearance is secondary to function. Whether it’s in automotive mufflers, catalytic converter shells, or structural parts exposed to high heat, 409 stainless steel offers an optimal solution where high-temperature strength and budget conscious performance are required.   In this blog, we’ll take you through the latest 409 SS sheet prices, technical details, available thicknesses, and where you can use them. Supplies from Different Countries Supplies from Different Countries Flag Country Code 🇮🇳 India IN 🇺🇸 United States US 🇬🇧 United Kingdom GB 🇨🇳 China CN 🇯🇵 Japan JP 🇩🇪 Germany DE 🇮🇹 Italy IT 🇹🇷 Turkey TR 🇦🇪 United Arab Emirates AE 🇸🇦 Saudi Arabia SA 🇶🇦 Qatar QA 🇴🇲 Oman OM 🇰🇼 Kuwait KW 🇦🇺 Australia AU 🇨🇦 Canada CA 🇳🇱 Netherlands NL 🇮🇩 Indonesia ID 🇪🇬 Egypt EG What is 409 Stainless Steel? 409 stainless steel is a ferritic stainless steel stabilized with titanium. It’s designed for: Moderate corrosion resistance  Excellent weldability High resistance to oxidation at elevated temperatures  Lower cost compared to 304 or 316 stainless grades This makes it ideal for automotive and industrial uses. Corrosion Resistance Grade 409 resists atmospheric and exhaust gas corrosion. A light surface rust will form in most atmospheres; this rust retards further corrosion but makes the surface undesirable for decorative applications. The corrosion resistance is about the same as that of 3CR12 and the 12% chromium martensitic grades such as 410, and inferior to the 17% chromium grade 430. Heat Resistance Generally, 409 is classified as resistant to scaling in intermittent service up to 815°C and up to 675°C in continuous service, but these temperatures are dependent upon the exact service environment.     Heat Treatment 1)Annealing Heat to 790-900°C and air cool. This grade cannot be hardened by thermal treatment.   2)Welding Readily welded but a pre-heat of 150-260°C is recommended. Grade 409 or Grade 430 electrode or filler rods can be used, but AS 1554.6 pre-qualifies welding of 409 with Grade 309 rods or electrodes. These austenitic fillers result in a more ductile weld. Post-weld annealing at 760-815°C improves weld ductility. Post-weld annealing is not required when welding thin sections. Automotive exhaust tubing is typically welded without filler metal (autogenously). All welding must be carried out with minimum heat input to reduce grain growth effects. Typical Applications Automotive exhaust systems, including catalytic converters and mufflers. Specified Properties The properties for Grade 409 are specified for annealed tubing in ASTM A268M. Compositions of other grades are for coil and sheet in ASTM A240M. Similar but not necessarily identical properties are specified for other products in their respective specifications.   Composition Specification (%) Grade   C Mn Si P S Cr Ni N Ti Nb 409 S40900 min. – – – – – 10.5 –   6x%C   max. 0.08 1.00 1.00 0.045 0.030 11.7 0.50 0.75 S40910 min. – – – – – 10.5 – – 6x%C – max. 0.03 1.00 1.00 0.040 0.020 11.7 0.50 0.030 0.50 0.17 S40920 min. – – – – – 10.5 – – 0.15 & 8 x (C+N) – max. 0.03 1.00 1.00 0.040 0.020 11.7 0.50 0.030 0.50 0.10 S40930 min. – – – – – 10.5 – – Ti + Nb = (0.08+8) x (C+N) max. 0.03 1.00 1.00 0.040 0.020 11.7 0.50 0.030 0.75   Mechanical Property Specification Grade Tensile Strength (MPa) min. Yield Strength 0.2% Proof (MPa) min. Elongation (% in 50mm) min. Hardness Rockwell B (HR B) max. Brinell (HB) max. 409 380 170 20 95 207 These same tensile, yield and elongation limits also apply to the other grades in ASTM A240M. Hardness limits are 88HRB and 179HB maximum for these other grades in flat rolled product.   Physical Properties (Typical values in the annealed condition) Grade Density (kg/m3) Elastic Modules (GPa) Mean Coefficient of Thermal Expansion Thermal Conductivity Specific Heat Electrical Resistivity 0-100°C (µm/m/°C) 0-315°C (µm/m/°C) 0-538°C (µm/m/°C) at 100°C (W/m.K) at 500°C (W/m.K) 0-100°C (J/kg.K) (nΩ.m) 409 7700 208 11.0 11.7 12.4 25.8 27.5 460 600   Grade Specification Comparison Grade UNS No Euronorm Swedish SS Japanese JIS No Name 409 S40900 1.4512 X6CrTi12 / X2CrTi12 – SUH 409 There are no known standardised international alternatives to the ASTM S40910, S40920 and S40930 grades. These comparisons are approximate only. The list is intended as a comparison of functionally similar materials not as a schedule of contractual equivalents. If exact equivalents are needed original specifications must be consulted.   Possible Alternative Grades Grade Why it might be chosen instead of 409 3CR12 Similar corrosion resistance, better weldability and more readily available than 409, particularly in heavy sections. (409 may have better drawability than 3CR12.) 304 Better corrosion resistance and heat resistance but at higher cost. 321 Higher heat resistance than 409 or 304. Aluminised steel Lower cost than stainless steel grade 409, but also a lower resistance to exhaust gases.     Where It’s Used ? Mostly in automotive exhaust systems, industrial ducting, furnaces, and construction parts where a shiny finish isn’t required.   In short, 409 SS is a practical stainless steel that