Get the best out of stainless steel
Stainless steel surfaces should be clean, smooth, and free from heavy surface oxides and contamination to provide optimum performance. During fabrication the surface can alter and degrade corrosion resistance properties. Fabrication can contaminate the surface with free iron and other deposits; it can damage the passive film through chromium depletion; and damage the surface mechanically. After fabrication it is essential to restore the properties by appropriate techniques. These techniques will be discussed during the seminar.
The science behind stainless
Stainless steels are iron-based alloys containing at least 10.5% Chromium, which are used primarily for their corrosion resistance. At this chromium level, a chromium-enriched surface oxide, called the passive layer or passive film, forms on the steel. There are many different stainless steels, but they all meet this minimum chromium requirement. The main types of stainless steels are: austenitic, ferritic, duplex, and martensitic. The main characteristics of the various alloy groups will be discussed.
The impact of corrosion on society
According to a recent study sponsored by the Federal Highway Administration (FHWA), corrosion costs the U.S. industry 3% of the gross national product (GNP) value. This means the direct costs, replacement and cost of corrosion protection is about $276 billion annually. In more comprehensible numbers, the cost is over $1000 per person each year. It is estimated that at least a third of the cost is unnecessary. Some of the main forms of corrosion that cause degradation of stainless steel will be discussed.
Bring on the heat
At elevated temperatures, properties of interest to the designer include mechanical ones, such as yield and tensile strength, creep strength or creep rupture, ductility, thermal fatigue, and thermal shock resistance. Properties that show environmental resistance include oxidation, carburization, sulfidation, and nitriding. A discussion on the various high temperature properties will be presented.
“Dr. Metals”, Hira Ahluwalia, Ph.D., is a scientist, metallurgist, materials and corrosion consultant to some of the world’s largest industrial consortiums, and president of Material Selection Resources, Inc. Dr. Metals has served as chairman of the National Association of Corrosion Engineers and is a recipient of that organization’s Distinguished Service Award. He has published over 20 articles.
Jason Martineau, National Sales Director of Penn Stainless, brings nearly 20 years of field experience to the stainless steel service industry. Jason is responsible for the development of PSP’s highly-regarded technical service operations, and has been instrumental in establishing and nurturing Penn’s presence in the Western PA / Eastern OH region.