BLOG-5 STEEL TREATMENT AND FINISHES

 BLOG-5    

                                    STEEL MANUFACTURE AND ITS FINISHES

A Video was played of steel manufacturing process in younstown1944, at the beginning of the session. The video explained the step by step process of the steel manufacture starting from the excavation of ore and minerals to the final end product using manual workmanship and machines.

Hot rolled steel:  Hot rolled steel is rolled out of the casting area to a specific thickness

Cold rolled steel: The steel is run through cold rollers, stretching the grains, smoothing the surface, dimensioning

Cold hardening – to increase strength and hardness. Hammering and compressing

Quenching   - Heats the steel and quickly cools it in water, oil, air. Strong and brittle.

Tempering- Heating and controlled cooling process. To increase strength, hardness,

                       and ductility.

Annealing- Heating and cooling it very slowly to make hard steel soft. Cold working,

                      Cutting and forming.

Galvanization- Application of zinc coating to prevent rusting

                             Hot dipped- repeated thick coating, zinc layer, matte grey color

                             Cold / Electro

Corrosion prevention methods  -  painting, galvanized and chemically treated.

Reaction with fire prevention      -   enclosed with gypsum layers, encasing steel in

                                                               Concrete, concealed with composite materials.

STEEL FINISHES:

Electropolishing -   it is a process that allows to decrease the surface roughness.

Electrolytic coloring- get in colors like bronze, gold, red, purple, green.

                                        0.02micro meter -0.36micro meter thickness film

Burnishing  - color black is obtained by dipping in sodium dichromate, durable.

Acid etching - creates pattern by dipping the unprotected parts of the surface in acid.

Painting – applied to improve the visibility. Available in pre- painted sheets.

Enamelling  -  coated with a mixture of ceramic powder and baked in oven at high

                       Temperature, where it melts and vitrifies.

Stainless steel- coloured with bronze, blue, gold, red, purple, green by chemical

                            treatment.

Metallic coating- stainless steel can be coated with another metals like copper and

                               tin for aesthetic appeals.


-MUHAMMAD

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