APPLICATIONS & WELDING
Steels are iron- based alloys containing less than 2% carbon. Other alloying elements and impurities are also present in the composition of steels. The alloying elements are either added voluntarily for deoxidation purposes (Mn, Si). Iimpurities (S, P) are entrapped from raw materials (ore, scrap) during the steel making process. In general, steels can be grouped into two families: carbon steel (low carbon mild steel & CMn steels) and alloy steels. The steels are classified and identified by their type and compositions and / or as per their standards such as AISI, SAE, ASTM, etc. Iron alloys containing more than 2% of carbon constitutes the family of cast irons.
Interesting mechanical properties can also be obtained for certain types of low alloy steels known as High Strength Low Alloy Steels "HSLA" eg ASTM A588, without resorting to conventional heat treatment of quenching and tempering. These types of steel are low carbon having a ferrite-pearlite microstructure hardened by grain refinement and precipitation or micro-alloy precipitates of (V, Nb, Ti). These steels are readily weldable with low risk of cracking due to their low carbon content compared to hardening steels
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