Stainless Steel Grade 409 Annealed Tube Of ASTM A268

Place of Origin	China

Stainless steel grade 409 ( UNS S40900 )Applications?This type of grade 409 stainless steels are widely used for :?Automotive exhaust tubing?Catalytic converter systemsChemical Formulation???C:≤ 0.08 ?, ??Mn：≤1.00, ?Si：≤1.00, ?Cr：10.5~11.75, ?Ni :≤0.50, ?P：≤0.045, ?S：≤0.03, ?Ti：(6C~0.75)? ?? ? ?Type 409 steels are available in highly stabilized forms, such as S40910, S40920, S40930, which?stability of is provided by the presence?of niobium, titanium in the composition.?Introduction? ?409 stainless steels used to be called " the cheapest stainless steels ".?? ?It is commonly considered?as a chromium stainless steel, which have excellent?corrosion??resistance, heat resistance and fatigue resistance. It can realize the exhaust?system?components??for a longer life time and a lightweight designs.? ?With high temperature resistance, the engine can work in high efficiency, at the same time,??reduce?the thickness?of exhaust?system , can reduce the emissions.?409 stainless steels are??cheaper than other stainless steels, with a good flexibility, high yield,?easy to replace, are??recyclable and environmentally friendly new materials. At present, Most famous?major automobile??manufacturers have used type 409 stainless steel materials for their production.?The automobile exhaust system can collect and disposal the emissions, which is high temperature,?high speed combustion come from the engine. Then exhausts gas overboard and reduces the noise level??of?the high velocity gas flow. The automobile exhaust system is the longest components of the auto??parts,?which must bear strict temperature change ( from -20℃ to 850℃ ) and high frequenvy??vibration. The 409?stainless steels can work as the heat from -20℃ to 650℃.? ?? ?Recently, as the global increasingly stringent environment target, the short distance urban??driving?increasing, and the spread of Winter snow remover, the standard of using exhaust system is??getting more?and more stringent. From standard Europe?Ⅱ to Europe?Ⅳ, the traditional steel can??not meet the?technical requirements. We estimate each car need 409 stainless steels appr 35kgs -??65kgs in the futuer.Composition? ? ? ? ? ? ? ? ??Table 1 - ?Composition ranges of type 409 stainless steelsMechanical Properties? ? ? ? ? ? ??Table 2 - Mechanical properties of type 409 stainless steels? ? ? ? ?? ? ? ??Physical Properties? ? ? ? ? ? ?Table 3 - Physical properties of annealed type 409 stainless steelsType Specification ComparisonPossible replace with:Heat Resistance?? Type 409 stainless steels can work at tempertatures up to 675℃?during continuous operation,?and up to 815℃ under intermittent conditions. This is very important to service environments.Heat Treatment? ? For 409 stainless steels, annealing is carried out at temperatures from 790℃ to 900℃,?followed by air cooling.Welding Performance?? ?Type?409 stainless steels must be pre-heated to temperatures of 150 to 260°C before welding.?Care should be taken to weld grade 409 steels with minimum heat, in order to mitigate grain?growth.Ductility of the welded products can be improved by annealing post-welding at temperatures of 760 to 815°C.