ALLOY ELEMENT AFFECTION IN STEEL PROPERTIES

If you are in steel industry, have you ever notice what all those chemical composition listed on a steel materials test report really mean? You may only know different steel grade has many different chemical composition and elements in different amount. Here in this post, we sort out and list 21 chemical elements and effects on … Continue reading ALLOY ELEMENT AFFECTION IN STEEL PROPERTIES

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Stainless Steel Material: what is pickling / passivation?

Stainless Steel material: ( refer to other topic: what is stainless steel? ) A metallic alloy (i.e., metal made of multiple elements such as chromium, nickel, and molybdenum) is generally considered to be “stainless” when its chromium content is greater than about 12 percent by weight ( some document mention it is about 10.5% chromium … Continue reading Stainless Steel Material: what is pickling / passivation?

Why Stainless steel rust / corrosion? – Part 2 – Other corrosion.

In Part 1, we know about Pitting corrosion. We will continue with remain one: 2) Crevice ( gap ) corrosion- Stainless steel requires a supply of oxygen to make sure that the passive layer can form on the surface. In very tight crevices, it is not always possible for the oxygen to gain access to … Continue reading Why Stainless steel rust / corrosion? – Part 2 – Other corrosion.

Why Stainless Steel Rust / Corrosion? – Part 1 – Pitting Corrosion!

Although stainless steel is much more resistant to corrosion than ordinary carbon or alloy steels, sometime we see rust on Stainless steel. It is 'stain-less' not 'stain impossible'. Sometime we see rust on Stainless steel.  It means it can corrode. Why??? It has some common forms of corrosion in Stainless steel: Pitting corrosion: (pitting corrosion of stainless … Continue reading Why Stainless Steel Rust / Corrosion? – Part 1 – Pitting Corrosion!