BLOG 7 - STEEL JOINTS AND OTHER CLASSIFICATIONS

 

BLOG 7

During this class we were taught of the behavioral properties of steel as a metal and its reaction at different temperature and the fabrication done for different usage

Steel is made to undergo processes to define its certain properties such as its anodic, cathodic and thermal expansive properties.

They are

·        Galvanic Action – which is an electrochemical process where metals are electrically contacted and the one in higher series will become anode and result in corrosion.

·        Co-efficient of thermal expansion: The changes occurred in the length of steel due to the effect of temperature is represented by the coefficient of thermal expansion.

·        Specific Gravity: It is the ratio of the density of the substance to the density of water.

·         Reflectivity is the ability to scatter the light falling on its surface. More the reflectivity less the absorption of heat

·        Oil canning: It is a slight bulging like bubbles or waviness that occurs in steel sheets due to the stresses. This can be prevented by using Thick sheets, backer rod, light colour sheet etc.

Metal joining - Steel is also fabricated for the different purposes of usage such as

·        Welding/ Soldering

·        Bolting

·        Riveting

·        Mechanical fastener

·        Pin Joint

 

Steel is classified into types like carbon steel (based on carbon content), alloy steel, tool steel and stainless steel.

Stainless steel is further classified into the following

·        Ferritic stainless steel: High chromium content – body centered cubic structure – strengthened by cold hardening

·        Martensitic stainless steel: Strong, tough, hardened by heat treatment.

·        Austenitic stainless steel: High level of nickel and chromium – Highly corrosion resistance, non magnetic and weldable

·        Ph steel: Precipitation hardening steel is hardened by a variety of heat treatments.

·        Duplex Stainless Steel: Combination of both ferritic and Austenitic types. Hard as twice as both of the types.

 

 

 

-Aafiyah Muskaan

Word Count: 290

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