Magnetic ferritic stainless steel grades, also referred to as chromium steel grades, are easy to form and machine. They come in a wide range of attractive surface finishes, and support superior product design.
Ferritic stainless steel grades
Ferritic stainless steel grades
The standard ferritic grades are alloyed with chromium (11.2–19 %), but with no, or very small addition of nickel, thus they have a ferritic microstructure. As nickel is one of the most expensive alloying elements and has demonstrated high price volatility, the low nickel content of the ferritic grades make them more price stable compared to grades with high nickel content. Molybdenum is added to some grades to improve the corrosion resistance, while alloying with niobium and/or titanium improves the weldability.
Lower-chromium Outokumpu ferritic steel grades are widely used in applications such as automotive exhaust systems, while our intermediate-chromium grades are popular among the world's leading household goods manufacturers.
In containing little or no nickel, our ferritics are very attractive from the price stability point of view.
Our latest innovation in ferritic steel grades is new high-chromium ferritic steel grade, Core 4622 (EN 1.4622). The grade is particularly suitable for façades, elevators catering and automotive industry.
There are also high temperature ferritic grades with increased resistance to high temperatures. These are mainly used in applications with sulfurous atmospheres (as sulfur may react with nickel in austenitic stainless steel grades) and / or at low tensile loads. These grades are typically alloyed with more carbon compared to standard ferritic grades in order to increase the creep strength, and with silicon and aluminum to improve the resistance to oxidation.
What is ferritic stainless steel?
Ferritic stainless steel grades have good mechanical properties, sitting broadly in the middle between the other stainless steel families. They typically have higher yield strength than austenitic stainless steels. The elongation and forming properties of ferritic steel grades are equivalent to those of high-strength carbon steels.
Modern ferritic stainless steels are readily weldable with conventional welding methods, including:
• Shielded metal arc welding (SMAW, MMA)
• Gas tungsten arc welding (GTAW, TIG)
• Gas metal arc welding (GMAW, MIG/MAG)
• Plasma arc welding (PAW)
• Laser welding
• Resistance welding
• High frequency welding (HF)
Versatile corrosion resistance properties
Ferritic steel grades offer a wide range of corrosion resistance properties from non-severe conditions inside the home to rough outdoor conditions. At the high-end, ferritics surpass even some austenitic grades in corrosion resistance.
The corrosion resistance of stainless steel is determined more by chemical composition than by austenitic or ferritic microstructure. Hence chromium content is the key ingredient also in the corrosion resistance of ferritic stainless steels.
Stainless Steel Finder
Check Stainless Steel Finder to compare the properties of our different ferritic stainless steel products.
Outokumpu product ranges where ferritic steel grades can be found
The Moda range is made up of ferritic stainless steels, including our key product Moda 430/4016 as well as several alternatives including low-chromium options. Head over to the Moda range site to learn more.
In our Core range there are several 17% chromium as well as our high-chromium Core 4622 ferritic stainless steel grades. They all have good formability and are widely used by appliance makers. Head over to the Core range site to learn more.
The Supra range contains stainless steel products designed for highly corrosive environments. The range’s stainless steels have a good resistance to uniform corrosion in many organic and inorganic chemicals. The Supra range includes one ferritic stainless steel grade, Supra 444/4521. Head over to the Supra range site to learn more.
The Forta range contains duplex and other high strength stainless steel products such as the temper rolled variants of many ferritic stainless steels. Head over to the Forta site to learn more.
Our heat resistant ferritic grades can be found in the Therma range. Head over to the Therma range site to learn more.
Our most popular patterned surface finish combines attractive design with functionality. Deco finishes are available for many ferritic and austentic stainless steels. Head over to the Deco range site to learn more.