7. Based on the steel description and specifications where would the application

Question

7. Based on the steel description and specifications where would the application of this steel material be most suitable for? Choose one of the multiple choice answers and provide a metallurgical explanation (explain in terms of notch toughness, hardness forming, mechanical properties and welding) of your choice? Hint: Ask yourself if the description and specification' required or appropriate for the application? [20 marks] a) Bucket loader for earth moving equipment b) Car body c) Garbage disposal bin d) Structural steel used in Saudi Arabia e) Structural member of a crane Steel Description and Specifications Dimensions Thickness range: 0.188" (5 mm)-2.75" (70 mm) Maximum width: 152" (3860mm) Maximum length: 960" (24400mm) Notch toughness Minimum Charpy average value of 20 ft-lbs at-50°F (27 Joules at -45°C). Hardness Heat-treated to develop yield strength. This results in a through-thickness hard product with a hardness range of 240-300 HBW Forming (up to 90°) Low alloy levels and consistent properties make it ideal for cold forming. Plate up to 1" (25.4mm) thick can be cold bent to a minimum inside bend radius of 2t (where t is the plate thickness). Mechanical properties (transverse tensile strength minimum 110 ksi (760 MPa)/130 ksi (900 MPa) yield strength minimum 100 ksi (700 MPa) elongation (percent) 16* Welding Excellent weldability. Because of its low alloy content, this grade can be welded using simple procedures and common, readily available consumables.

Explanation / Answer

As it has excellent weldability, it will help to make a complex shape by welding. The steel has a very high tensile strength and yield strength which may be sustained very high amount of load. But it has a larger elongation percentage(16%), which means that the structure can elongate with an application of load. It has also good forming capacity means we can make a difficult shape by a cold bend. From the dimensions information, we can say that we can make a big shape by using this steel.

From the above analysis, we can conclude that this steel will be ideal to use for the car body. As car body required very high strength and good forming. Also, it required many welding to make the whole body. So this steel will be ideal for the car body.

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