Steel_Student blog

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...

 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...

24/August/2020 Impact of Weather conditions on the building material - Steel  Temperature - Steel expands in summer, when the temperature is down, it might contract. This repeated expansion and contraction might affect the durability and the tensile strength of the steel.  Humidity and Precipitation - The major factor that has an impact on steel - Corrosion, erosion, rusting - When there is moisture content in the air, the steel tends to react with the water.  Wind - Contains salt content - steel is reactive to salt  Disadvantages of Steel - Impact of weather conditions on Steel  High atmospheric humidity increases the moisture content in air. A steel surface is allowed to begin to rust when the relative humidity in the air climbs above 50%, and steel surely rusts when the relative humidity reaches 80%. This can result in flash rust that collapses the coating. If it is painted, it might result in blistering and delamination of the surface coa...

The process of getting Steel from Iron can be elaborated in five steps   Ironmaking   Steelmaking   Casting    Rolling   Finishing   Here's an infograph       - Janani Venkateswaran