Ferritic stainless steel is a type of chromium alloy that has ferritic structure at elevated and room temperature with body-centered cubic crystal structures. It has a chemical composition consisting of C≤0.02% and Cr 10.5%~32% and cannot be hardened by heat treatment. Ferritic stainless steel is used in comprehensive applications with excellent general properties, and is taken as a kind of primary nickel-saving stainless steels.
Grades：409L, 439, 444
ASTM A268 Standard Specification for Seamless and Welded Ferritic and Martensitic Stainless Steel Tubing for General Service
JIS G3463 Stainless Steel for Boiler and Heat Exchanger Tubes
GB/T 30065 Welded ferritic stainless steel tubes for feedwater heater
GB/T 30066 Welded ferritic stainless steel tubes for heat-exchanger and condenser
1.High thermal conductivity
2.Low expansion coefficient
3.Good antioxidation property
4.Excellent stress corrosion resistance
The ferritic stainless steel metallurgy has several advantages including its low cost option for corrosion resistant stainless steel, being appropriate for several automotive applications including Exhaust System Flanges and Hot Exhaust Gas Oxygen (HEGO) Sensor Bosses, its Antilock Brake System Sensor Rings as well as its Rearview Mirror Mounts. Magnetic applications for stainless steel include magnetic probes, sensors, armatures, and pole pieces requiring corrosion resistance without plating.
The following tables contain a list of the stainless steel, and other materials, that are available. For more complete coverage of properties, reference MPIF Standard 35, ASTM B783, ISO 5755, DIN 30910-4, and JIS Z2550, and download the technical information bulletins of interest. Standard powder metal materials are defined in North America by MPIF Standard 35 and ASTM B783, essentially equivalent standards. German PM steels are listed in DIN 30910-4, or more recently, ISO 5755. Japan steels are listed in JIS Z2550, with grade names changing with the revision from 1989 to 2000.
409L SSI-409L; APMI/MPIF SS-409L, SS-409LE A lean chromium (11%) stainless steel with a small columbium (niobium) addition to prevent weld sensitization.
410L SSI-410L; APMI/MPIF 410L ISO FL410
JIS SMS 2025, SMS 2035 A lean chromium (12%) stainless steel with low carbon and nitrogen (“L” indicates <0.03%) to maximize both corrosion resistance and ductility.
430L SSI-430L APMI/MPIF 430L ISO FL430 A higher chromium (17%) stainless steel to improve general corrosion resistance compared to 409L and 410L.
430LCb SSI-430LCb Stainless steel 430L a type with a small columbium (niobium) addition to prevent weld sensitization.
430N APMI/MPIF 430N2 DIN Sint-C42 (Type 430) 430 sintered in an atmosphere containing nitrogen for higher strength and hardness at the expense of some corrosion resistance.
434L SSI-434L APMI/MPIF 434L ISO FL434 430L stainless steel with a small addition of molybdenum (1%) improves general corrosion resistance.
434LCb SSI-434LCb APMI/MPIF 434LCb 434L with a small columbium (niobium) addition to prevent weld sensitization. 434N APMI/MPIF 434N2 434 sintered in an atmosphere containing nitrogen for higher strength and hardness at the expense of some corrosion resistance.