FERRITIC STAINLESS STEELS
Ferritic stainless steels contain 11 - 30% Chrome (Cr) and low carbon. Main element is Chrome (Cr) and then Molybdenum (Mo). All of the Ferritic group is magnetic. Due to the low Carbon (C) content, Ferritic stainless steels are not hardenable with heat treatment.
Ferritic grades were introduced as an economic alternative to Austenitic grades. Main motive was to keep the corrosion resistance with the help of Chrome (Cr) and Molybdenum (Mo), but reduce the cost with the absence of Nickel (Ni), where the superior mechanical properties that Nickel (Ni) brings are simply not necessary.
AISI 430 is the most popular grade of this group. It has a good corrosion resistance and cold formability. This grade is suitable for deep drawing. Weldabilty is poor in this grade.
For machinabilty, instead of 430 grade, Sulfur (S) content added 430F grade must be preferred. Sulfur adds improved machinabilty, but reduces the corrosion resistance in 430F grade.
Ferritic grades can be divided into 3 subcategories depending on the Chrome (Cr) content:
11 - 13 % Chrome: (409, 410S, 1.4003) They have average oxidation ve corrosion resistance, along with more economical costs. Main application is automotive exhaust parts. Most widely used grade is 409.
14 - 18 % Chrome: (430, 434, 436, 439, 430Ti, 441, 444) These grades contain medium level of Chrome and mainly used in Automotive parts and kitchenware. Weldabilty and impact reisstance is poor. Some grades have additional Molibden (Mo) content for better corrosion resistance.
19 - 30 % Chrome: (Super Ferritics 442 and 446 ) This group is examined seperately than the ferritics. They are used for high oxidation ve corrosion resistance applications.
Ferritic grades are usually found in Coils/Sheets, Bars and Welded Tubes. You may find Ferritic grades in Teknik Metal stocks in round bars, coils and sheets form. Available grades in sheets and coils are 430, 409, 410S and 1.4003. Available grades in round bars are 430L and 430F.
For more information of the Ferritic grades in Teknik Metal stocks, please check our stock range.