Localised corrosion occurs in specific locations rather than across the entire exposed surface.
General (or uniform) corrosion is the most common form of corrosion, where corrosion occurs across most of the surface area of the metal.
There are many different variants of corrosion, reflecting both the impact of different environments and the failure mechanism.
Forging and casting are fundamentally different processes, so any comparison must consider the particular component and requirements.
Trepanning is the process of creating a hole through the centre of a solid bar, where the metal is removed as a smaller solid bar.
A deep hole is normally considered to be one where its depth is 10 x greater than its diameter.
There are subtle composition differences between super duplex grades, but Ferralium is the only one to exceed a min. yield strength of 85ksi.
Alloy 825 and Alloy 925 are nearly identical in composition, but Alloy 925 is appreciably higher strength.
Improvements have been made to the composition, reducing impurities and associated inclusions, plus improved heat treatment.
Ferralium is the original super duplex stainless steel, developed by Langley Alloys throughout the 1960’s and a patent in 1967.
Alloy 625 and Alloy 725 are nearly identical in composition, but Alloy 725 is appreciably higher strength.
Alloy 316 offers improved corrosion performance over Alloy 304, by virtue of an increased molybdenum content.