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Steel Definitions

View: 49705/13/2017  

Steel Definitions

The carbon content of steel is between 0.002% and 2.1% by weight for plain ironcarbon alloys. These values vary depending on alloying elements such as manganesechromiumnickel, iron, tungsten, carbon and so on. Basically, steel is an iron-carbon alloy that does not undergo eutectic reaction. In contrast, cast iron does undergo eutectic reaction. Too little carbon content leaves  iron quite soft, ductile, and weak. Carbon contents higher than those of steel make an alloy, commonly called pig iron, that is brittle . While iron alloyed with carbon is called carbon steel, alloy steel is steel to which other alloying elements have been intentionally added to modify the characteristics of steel. Common alloying elements include: manganese, nickel, chromium, molybdenumborontitaniumvanadium, tungsten, cobalt, and niobium.Additional elements are also important in steel: phosphorussulfursilicon, and traces of oxygennitrogen, and copper, that are most frequently considered undesirable.

Alloys with a higher than 2.1% carbon content, depending on other element content and possibly on processing, are known as cast iron. Cast iron is not malleable even when hot, but it can be formed by casting as it has a lower melting point than steel and good castability properties. Certain compositions of cast iron, while retaining the economies of melting and casting, can be heat treated after casting to make malleable iron or ductile iron objects. Steel is also distinguishable from wrought iron , which may contain a small amount of carbon but large amounts of slag.

Baoxin insists on routine testing of all raw materials


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