Steel_Student blog

22/September/2020  Coatings and Finishes    It takes me back to my initial blogs where I quoted that " God is in the Coating ". Seems like that’s not an amateur statement to make. The productivity, especially, in huge spans and in large structures depend legitly on the type of the coating and finishes the members obtain. The efficiency of Steel members is directly proportional to the type/ quality of coating.     Although steel was introduced in building construction because it was fire resistant, to replace timber, Steel itself is not that Fire R esistant . Another major disadvantage with steel with respect to context is the weather. Humidity causes C orrosion and rusting is evident. Certain issues pertaining to the Cleanliness and Maintenance also add to this list, like the trusses becoming a roosting place for pigeons, problems regarding the height of the structure and the equipment required to clean it. The frequency and efficiency of maintenance has a b...

  01/September/2020 Today’s session is clearly a continuation of my previous blog. Sections were already a part of the evolution and today's session made it clear that certain things, even though evoloving, does not lose its originality and they do have their own importance because of which it becomes irreplacable. So, today was about learning the different types of sections available in standard structural steel and about a more complex steel strata called AESS. The details are as follows :-   Market forms of steel Angle sections - Equal and unequal angles of sizes (200x200x25) mm - 736N/m length, 30x20x3mm -11N per m length. Usage - Filler joist flooring, structural steel roof trusses, bridges, etc Channel sections - 2 flanges and 1 web section, Types - ISJC (Jr.), ISLC (Light), ISMC (Medium) and of sizes 100x45 per metre length - 58N Corrugated - Formed by passing steel sheets through grooves and its market form is GI sheets - used as roof covering material Expande...

29/August/2020   William Strutt was working in a mill, built with timber. He was a cotton spinner who wanted to protect his mill from fire, because he was working with inflammable substances. So, he encased timber with iron to make it fire resistant. Later this addition of iron to building construction was expanded from casing the structure to making it the structure itself! So, from then, building framework was made out of Iron. This not only made the building fire resistant, but also very strong compared to the previous one which was made of timber.   Later, this solid iron framework was replaced by hollow sections. This not only provided insulation, but also reduced the construction cost by 30%. Later this usage of iron in construction was not just limited to the framework, but also started to expose itself in facades.   All this was around England and New York. In 1869, Chicago fire had crushed off around 17500 buildings and made a lot of residents homeless. So, t...

27/August/2020       Metals are vast like ocean and studying the characters and properties takes ages. It is not that easy to differentiate those which look similar, leaving the chemical composition apart. Iron and steel sometimes look so similar and so is the case of brass and bronze. It might be so easy to define them based on the elements that are added to the parent metals to attain the other metal alloys, but one cannot so easily judge the metal purely based on the appearance or the visual aspect of it.    It becomes easy if we understand the manufacture of these other elements that look so similar. In the case of iron and steel, if polished and laminated, both of them will look very similar, but one can perceive the difference based on the thickness, colour, grains at the section. Usually, the parent metals like iron and bronze are much thick, they expose the sections in a much native way and exhibit a rough/real/heavy nature. But the alloys of these...

 26/August/2020 Today's session was more properties of Steel and similar metals for learning more details and workability with different ways and methods: -    Galvanic Action  Higher end is anode and at the lower end is th cathode. When current is passed through a combination of metals, the one at the higher end will corrode first.  Co-efficient of thermal expansion  Charge/length of materials/degree of change in temperature Specific Gravity Density of substance/ Density of water  Tensile/Yield strength  Tensile strength is the maximum ability of the metal to withold stress, will show necking and will fail at a point called fracture.  Tield strngth is the maximum ability of the metal to exhibit elasticity after which it cannot undergo deformation and will become plastic. Reflectivity  p(y)=Gr(y)/Gi(y)  Where P is the reflectivity, Y is the wavelegth, Gr is reflecting radiation, Gi is the incident radiation Oil Canning  An elas...