Rust on the surface of stainless steel is often caused by contamination with a regular steel.
A stainless steel is defined as a steel which contains more than 10.5% of chromium.
There are a number of proprietary cleaning agents for stainless steels but for most applications following some simple rules will suffice.
The term super duplex is typically applied to duplex stainless steels with a chromium content of 25% and a PREN value >40.
A hollow bar is a bar with a central bore running along its length, produced by extrusion in the same way as seamless tubes.
Zeron 100 is a super duplex stainless steel developed in the 1980’s by Mather & Platt, more widely referred to as Alloy 32760, F55, 1.4501.
XM-19 is a highly alloyed austenitic stainless steel as listed in ASTM A276/A479 as UNS S20190.
A sheet is a thinner item of metal cut from a continuously rolled coil, whereas a plate is a thicker item rolled as a single piece.
There are subtle composition differences between super duplex grades, but Ferralium is the only one to exceed a min. yield strength of 85ksi.
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 316 offers improved corrosion performance over Alloy 304, by virtue of an increased molybdenum content.