The Sandvik Materials pod

Season three of the Materials Pod is now out there! This season concludes the seven families of stainless steels and in episode four dips into the subject of stainless in the medical industry - a subject that we will revisit in more depth at a later date.

Sandvik is publishing a series of technical articles, both on the website where they can be read and as a podcast where they can be heard. If, like us, you’re a bit of a materials nerd, don’t miss this!

Click on the links below to hear or read the next four articles.

S03E04. Medical applications of stainless alloys

S03E03. Nickel-rich austenitic stainless steels

S03E02. Precipitation hardened stainless steels

S03E01. Metastable austenitic stainless steels

S02E04. Martensitic Stainless Steels

Martensitic steel has been used by smiths to make knives, axes and ploughs for thousands and thousands of years. In the season finale of the second season of our Materials Pod, you’ll find out what makes this particular type of steel so good in everything from tools and weapons to farming gear.

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S02E03. Duplex stainless steels- an interplay between ferrite and austenite

The whole is surely greater than the parts! Find out why this is the case for duplex stainless steels - and why they are so essential for many industrial purposes today – in the third episode of the Materials Pod.

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S02E02. Ferritic stainless steels-almost immune to stress corrosion

S02E01. Austenitic stainless steels - from kitchen sinks to fuel cell cars

To people in general, austenitic stainless steels are most well-known through a variety of kitchen utensils and domestic appliances, such as kitchen sinks, dish-washers, silver ware and washing machines. The importance of this in the improvement of hygiene and our quality of life cannot be exaggerated.

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E4. Bye-Bye Corrosion! - Molybdenum and tungsten in duplex steels

In my previous column, I promised to give an overview of the role of molybdenum and tungsten in duplex stainless steels (DSS). They are neighbors of chromium in the periodic table (Group 6B) and even more potent than chromium in preventing pitting, which is shown in the familiar PRE-relation: PRE = %Cr + 3.3×[%Mo + 0.5%W] + 16%N

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E3. Chrome It Up! - Chromium in duplex steels

Designing a steel that is stainless was considered impossible in the beginning of the 1900’s. A renowned German chemist, G Mars, maintained the opinion that creating a stainless steel is impossible because iron is not a noble metal and its oxides are thermodynamically more stable than the pure metal. The year was 1911 but, by the irony of fate, the two first stainless steels were launched the following year.

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E2. Steady On! - Nitrogen in duplex steels

Some nitrogen has been present in steel as long as steel-making has taken place. This has been unintentional and, in practice, there have been no means of removing or controlling the nitrogen concentration. It was not until the advent of modern process metallurgical techniques such as AOD, VOD and CLU during the 1970’s that nitrogen could be added to the steel melt in a controlled way and nitrogen, therefore, became an important alloying element.

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E1. Rock steady! - Nickel and manganese in duplex steels

In this series of articles, the role of the elements nickel, manganese, chromium, molybdenum and nitrogen in the design of duplex stainless steels will be described. An optimum balance between austenite and ferrite is accomplished by a clever use of the alloying elements.

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