What Is Stainless Steel - Tianjin Zhongyuanyuanda Steel Co.,Ltd.

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What Is Stainless Steel

The many unique values provided by stainless steel make it a powerful candidate in materials selection. Engineers, specifiers and designers often underestimate or overlook these values because of what is viewed as the higher initial cost of stainless steel. However, over the total life of a project, stainless is often the best value option.

Stainless steel is not a single specific material: it is the name given to a group of corrosion resistant steel alloys which contain a minimum of 12% chromium.

The chromium in stainless steel reacts with oxygen in the air to produce a very thin, inert, chromium rich oxide film on the surface of the steel. It is the presence of this film which provides the corrosion resistance of stainless steel. This passive film is unlike coatings such as paint or galvanising in one very important way. If it is damaged by abrasion or mechanical means such as cutting, it re-forms and continues to protect the steel.

Types of Stainless Steel

Ancon has the capability to fabricate all Austenitic, Duplex and Super Duplex stainless steels. Building products are normally manufactured from Austenitic stainless steels.

Austenitic Stainless Steels

All stainless steels have inherent corrosion resistance but the Austenitic group is superior in this respect and is principally used in construction applications. These high chromium steels are ductile and strong. They are non-magnetic and can be readily formed and welded. Higher strengths can be obtained by cold working.

Ferritic Stainless Steels

Ferritic steels are weaker and less ductile than austenitic steels. They are magnetic and their strength can be increased to a certain extent by cold working. Common ferritic steels are comparatively cheap. They have poorer resistance to pitting, but superior resistance to stress corrosion cracking than austenitics. If appearance is important, their use should be restricted to indoor applications.

Duplex and Super Duplex Stainless Steels

These steels have a mixed austenitic/ferritic microstructure. They are stronger than austenitic steels but are not as easily formed. They are magnetic and can be welded; their corrosion resistance is better than that of austenitic steels, particularly their resistance to stress corrosion cracking.

Material Specification

The two main grades of austenitic stainless steel used in the manufacture of Ancon products are 1.4301 (304) and 1.4401 (316).

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