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Grades & Properties of Steel Properties of Steel Plates

Form ability and W eldabilityThe major benefit of this grade of steel is its mild temper. It's easy to form and easy toweld, allowing it to be used to put sheet plate on doors, steel cabinets and the exteriorsurfaces of most objects. Chances are, if you've got an object with a steel exterior that wasmade in China, this is the grade of steel used for the outside of it. It is the combination ofcomparatively low price and ease of use that makes this steel nearly ubiquitous inconsumer goods where low weight isn't a major concern.

M echanical PropertiesSteel tensile strength is expressed in units of force divided by cross sectional area; in theMetric system, this unit is known as the Pascal. One Pascal is a Newton (the force neededto accelerate a one kilogram object to a velocity of one meter per second) per square meter.The tensile strength of Q345B steel is rated at 470 to 630 MegaPascals (where mega ismillion) and a yield strength (where the material starts to thin and pull like taffy) at 345MegaPascals. Like most steels of its grade, it suffers elongation before it pulls apart,typically at 20-21 percent of its initial length.

Density, Thickness and M assThe density of Q345B steel is approximately 7.8 (where water is 1.0), and it is commonlyavailable in thicknesses ranging from 2 mm to 12.7 mm (12.7 mm is approximatelyhalf-inch thick plates), with sheets typically sold in 1 to 1.35 meter wide splits. By way ofcomparison, a 2 mm thick sheet that was 1 meter wide by 3 meters long would have avolume of 0.002 *1 * 3 or 0.006 cubic meters, and would have a mass of 0.006 * 7.8 =0.0468 kilograms.

Q345B steel is a Chinese standardized low alloy, mediumtensile strength steel made with a hot-rolling process,and is used for a number of manufacturing purposes. It isa steel with less than 0.2 percent of its composition madeup of carbon, less than 0.55 percent of its compositionmade of silicon and several impurities (mostly sulfur,chromium and nickel). This particular grade of steel is a'general purpose' manufacturing steel, used for sheet metal, light structural elements ofhousehold goods, and similar uses where it won't be used as a major structuralcomponent.

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