For Mild to medium Corrosive Environments
CoreThe Core range contains austenitic and ferritic stainless steels grades for mild to medium corrosive environments in PRE range 17 – 22.
The most widely used austenitic stainless grade, Core 304L/4307 (EN 1.4307), defines the overall landscape of the Core range. The Core range is complemented by modern stabilized nickel-free 18 – 21% chromium ferritic stainless steels, like Core 441/4509 (EN 1.4509), and low-nickel austenitic alternatives.
The latest Core range addition is the stabilized 21% chromium ferritic stainless steel, Core 4622 (EN 1.4622). Nickel-free Core 4622 offers similar corrosion resistance, weldability and better heat transfer, machinability and deep-drawability compared to 304L.
Core range Cr-Ni austenitic stainless steels have good corrosion resistance, welding and forming, especially stretch-forming characteristics. Austenitic steels exhibit very high ductility also down to cryogenic temperatures. Due to the higher toughness and work hardening nature of the austenitic stainless steels, special attention may be needed during forming and machining operations compared to ferritic stainless or carbon steels.
Modern Core range stabilized ferritic stainless steels have good corrosion resistance, welding and deep-drawing properties. Thanks to phase structure, nickel-free ferritic stainless steels grades have excellent resistances to chloride-induced stress-corrosion cracking. Ferritics have good heat transfer properties that can be utilized in applications where uniform and fast heat transfer is preferred. Good heat transfer with lower thermal expansion eases weldability via smaller weld distortion and buckling behavior than austenitics. In addition, ferritics have similar machinability as carbon streels, due to low work hardening characteristics.
Core range grades can be used in a wide range of applications supported with a broad selection of surface finishes from mills and service centers.