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17 May 2019 , Stainless steel, Mark Newman

If the question were asked "what is Sandvik Materials Technology (SMT) best known for?", a large proportion of people would answer "Duplex Stainless Steels". The world of stainless steel tends not to generate too much public controversy, but I recall an ongoing argument back in the early 90’s in the letters pages of Stainless Steel World about duplex stainless steels and the role Sandvik 3RE60 played in duplex development.

23 Mar 2018 , Sustainability, Mark Newman

From the few examples mentioned in this column, new methods of generating electricity will also require new materials solutions to deal with the environments they will work in.

19 Feb 2018 , Stainless steel, Jan-Olof Nilsson

When plastically deformed, traditional austenitic stainless steels with 18% chromium and 8% nickel undergo a martensitic phase transformation. This is due to the fact that the austenite phase is not thermodynamically stable at room temperature. As seen in the phase diagram in Fig 1 the phases expected at room temperature (in true equilibrium) are austenite (γ), ferrite (α) and carbides.

19 Feb 2018 , Stainless steel, Jan-Olof Nilsson

Owing to the unique combination of properties of stainless alloys they are indispensable in modern medicine. The required materials properties include good corrosions resistance in body fluids, biocompatibility, good strength to-weight ratio, fatigue resistance and a low magnetic susceptibility. The term biocompatibility is not well-defined but can be described in simple terms as the ability to perform adequately in a specific situation in the human body.

19 Feb 2018 , Stainless steel, Jan-Olof Nilsson

An Achilles heel of austenitic stainless steels is the susceptibility to stress corrosion cracking (SCC). However, when the nickel concentration exceeds about 20% considerable improvement in the resistance to stress corrosion is observed (Fig 1). Nickel-rich austenitic stainless steels (NiASS), therefore, deserve to be treated as an own family. In fact, for nickel concentrations beyond about 30% the resistance to stress corrosion is comparable to that of duplex and ferritic stainless steels.

19 Feb 2018 , Stainless steel, Jan-Olof Nilsson

An Achilles heel of austenitic stainless steels is the susceptibility to stress corrosion cracking (SCC). However, when the nickel concentration exceeds about 20% considerable improvement in the resistance to stress corrosion is observed (Fig 1). Nickel-rich austenitic stainless steels (NiASS), therefore, deserve to be treated as an own family. In fact, for nickel concentrations beyond about 30% the resistance to stress corrosion is comparable to that of duplex and ferritic stainless steels.

16 Nov 2017 , Stainless steel, Jan-Olof Nilsson

Martensite, the hardest structural component in steels, is responsible for the high hardness in many sharp edge tools. The formation of martensite is a remarkable phenomenon in materials science and smiths have known for at least 3000 years how to make use of it to produce implements such as knives, axes and ploughs. Therefore, martensite has played a crucial role in the development of our civilization.

10 Nov 2017 , Stainless steel, Jan-Olof Nilsson

Number three in a series of eight columns throughout 2017 on the topic of the seven families of stainless steels; their characteristics, complementary properties and the wide variety of applications from the smallest of items destined for the human body to large scale constructions in the process industry. This month features duplex stainless steels which combine the properties of austenite with the properties of ferrite.

3 Nov 2017 , Stainless steel, Jan-Olof Nilsson

The second in a series of eight columns throughout 2017 on the topic of the seven families of stainless steels; their characteristics, complementary properties and the wide variety of applications from the smallest of items destined for the human body to large scale constructions in the process industry. This article focuses on ferritic stainless steels which are so resistant to stress corrosion.

27 Oct 2017 , Stainless steel, Jan-Olof Nilsson

This column is the first in a series of eight columns on the topic of the seven families of stainless steels; their characteristics, complementary properties and the astonishingly wide variety of applications ranging from tiny stents in the human body to large scale constructions in the process industry. It is natural to start with the family of austenitic stainless steels because of its large impact on our society.

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