Types of stainless steels - structures

 

Stainless and acid resistant grades according to Polish standard and equivalents according to which the company supplies materials:

 

 


Stainless and acid-resistant grades of steel according to EN / DIN / AISI / UNS standards:

 

 

Stainless and acid-resistant steel - Genesis

Used and processed for: cutlery, knives, balustrades, fences, structures, everyday appliances, tanks and machines for food production, chemical reagents - steels resistant to corrosion. In various industries, they are one of the most important steels responsible for their aesthetics, while at the same time they play a responsible role in maintaining the pressure, stress, pressure, and durability of a sub-assembly exposed to difficult environments in a given work environment.

In the twenties of the twentieth century, when testing for corrosion resistance, it was found that steel containing 13% chromium did not undergo electrochemical corrosion. As a result of further research, stainless steels with ferritic and martensitic structures were produced, and subsequently austenitic steels 18-8. In the 1940s ferritic-austenitic steel was invented.

 

Stainless steel - chemical composition and characteristics

For the determination of corrosion-resistant steel, the iron alloy must be considered, in which the basic element giving its properties is Chromium - Cr with a minimum content of about 12-13% of the product weight in general terms. Nickel-Ni is most commonly used in conjunction with Chromium, thanks to which was made the most common corrosion-resistant steel 18/8 (0H18N9 - X5CrNi18-10 - AISI 304), which is treated with various alloying additives as well as limiting the ranges of certain elements to form new grades of steel.

Failing to complete this thesis with information on maintaining a relatively low carbon level in the composition, it could be considered that the tool steel could also be stainless (eg NC11LV). Carbon-C, which is always present, is making steel more prone to corrosion. In order to prevent this, in proportion to the increasing range of carbon, an amount of chromium should raise in the composition. Otherwise, the material will be covered with rust in demanding environments.

It is likely that carbon might not be a welcome element in corrosion resistant steels. It influences decisively the structure of steel, at its low concentration the steel is soft, has no suitable mechanical properties, and is not used for hardening. In addition, it is worth mentioning that Chromium with Carbon are creating chromium carbides on the surface of the product.

Apart from Chromium, the second primary element supplemented by stainless steel is Nickel - Ni. Other occurring elements are: Manganese - Mn, Silicon - Si, Aluminum - Al, Molybdenum - Mo, Copper - Cu, Cobalt - Co, Tungsten - W, Niobium - Nb, Selenium - Se, and Titanium - Ti.

They are alternately referred to as corrosion-resistant steel, acid-resistant steels, stainless steels, INOX steels (fr. inoxydable - stainless).

Stainless and acid-resistant bars, pipes, sheets, strips, forgings

The above-described stainless steels, acid-resistant steels, or generally referred to as corrosion-resistant steels define PN-71/H-86020, PN-83/H-84017, IS-63/0642-01, IS-63/0644-02, and current euronorm PN-EN 10088-1, PN-EN 10155 according to which are delivered:


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