Understanding , kind , type and character of Stainless Steel

Definition of stainless steel / stainless steel

Why call a stainless steel or stainless steel, and why stainless steel does not rust ? Referred to as stainless steel (stainless steel) because this type of steel resistant to the effects of oxygen and has a stable oxide layer on the surface of steel, stainless steel can withstand the impact of oxidation because it contains elements Chromiun more than 10.5% , this is the element chromium is the main protector in stainless steel of the symptoms caused environmental conditions.

Stainless steel for the main groups according to the type and material as the material of manufacture porsentase . Group / classification of stainless steel , among others, are as follows :

1 . Groups Martensitic Stainless Steel

Understanding, kind, type and character of Martensitic Stainless Steel Chrome memilliki content of 12% to a maximum of 14 % and in the range of 0.08 to 2.0 % Carbon.

High carbon content is a good thing in response to heat to provide a variety of mechanical strength , such as steel hardness. Class of martensitic stainless steels show a combination of both the corrosion resistance and mechanical properties of heat treated on its surface making it great for a variety of applications . This group of stainless steels are magnetic . In a group or classification martensic in for a few types which include:

• Type 410 chrome Contains as much as 13 % and 0.15 % carbon , the type that is best used on cold working.
• Type 416 Contains the same with type 410 , but there are additional elements shulpur.
• Type 431 Contains 175 chrome , 2.5 % nickel and 0.15 % maximum carbon .

2 . Groups Ferritic Stainless Steel

Ferritic chrome contains as much as 17 % and between 0.08 to 0.2 % carbon. Have increased corrosion resistance properties at high temperatures.

However difficult in the group doing heat treatment of stainless steel so that the use be limited , this group of stainless steels are magnetic. In a group or classification ferrtic in for a few types which include:

*Type 430 chrome Contains as much as 17 % , and a low content of steel . Hold up temepratur / temperature 800 % , usually made ​​in the form of steel strips.

Understanding , kind , type and character of Stainless Steel

3 . Groups Austenitic Stainless Steel

Austenitic chrome contain in the range of 17-25 % and 8-20 % Nickel at the range and some elements / additional elements in order to achieve the desired properties. This group of stainless steels are non- magnetic . In the austenitic group or classification in for a few types which include:

• Type Type 304 is made with material and economic considerations , it is good for the environment polluted and in freshwater but not the recommended use is in direct contact with sea water.
• Type 321 is a variation of type 304 but with the addition of Titanium and Carbon proportionally . Pretty good for high temperature processing.
• Similar to type 347 Type 321 but with the addition of Niobium ( not Titanium )
• Type 316 In this type there is the addition of 2-3 % Molybdenum element so as to provide protection against corrosion , both in use on equipment associated with the sea water . The addition of 12% Nickel remained maintain the austenitic structure.
• Similar to type 317 type 316 , but there is more to the addition of the element / elements by 3-4 % Molybdenum , provides enhanced when in direct contact with sea water at a temperature / temperature dingin.f . 6 Moly More known as UNS S31254 , is a type that has a high resistance to sea water due to high levels of Chromium and molybdenum.
• L Grade Carbon Contain low ( 316L ) is limited between 0.03 to 0.035 % , this will lead to a reduction in tensile strength.

4 . Groups Duplex Stainless Steel

Is the latest group to have a balance of Chromium, Nickel , Molybdenum and Nitrogen in the same mixture between the austenite and ferrite groups. The result is a high strength, highly resistant to corrosion.

Recommended temperature -50 to +300 ° C. Usually the called UNS , as a trademark. Some types include:

• UNS S31803 duplex This is a type of class that is most widely used . Its composition is : 0.03 % maximum carbon , 22 % Chrome , 5.5 % nickel , and 0.15 Nitrogen.
• UNS S32750 duplex Type is low by nature similar to type 316 , but doubled its strength . Its composition is : 0.03 % carbon , 23 % Chrome , 4 % nickel and 0.1 % is Nitrogen.
• This is the type UNS S32750 super duplex for groups , increased corrosion resistance . The composition of this type are : maximum 0.03 % Carbon , 25 % Chrome , 7 % nickel , 4 % Molybdenum and 0.028 nitrogen.

The conclusion of the discussion of Stainless Steel

Thus the discussion about Stainless Steel / Stainless Steel and why Stainless Steel is resistant to corrosion / rust. By knowing all the characteristics of materials and materials in stainless steel will be the reference for the selection of a particular job, of course, with consideration of the surrounding environment, the strength and budget / funding to a job using steel.