The density of steel is 7.85 g/cm 3.

ρ (density, g/cm3)11000 = w (weight, kg )÷F (cross-sectional area mm? ) ÷L (length, meters).

The unit of measurement for calculating the theoretical weight of steel is kilogram (kg).

7.85 (specific gravity) *5MM (thickness) * 1m2 = 39.25kg.

Length * width * height (thickness) *7.85= weight (kg)

Mass of a 5 cm square steel plate = density times volume = 7.85×10.3 kg/m? × 1m？ × 0.05m = 392.5kg. ..

Extended data:

The steel grade of thick steel plate is basically the same as that of thin steel plate. In all aspects of products, besides bridge steel plate, boiler steel plate, automobile steel plate, pressure vessel steel plate and multi-layer high-pressure vessel steel plate, there are also some kinds of steel plates, such as automobile girder steel plate (2.5~ 10 mm thick), patterned steel plate (2.5~8 mm thick), stainless steel plate and heat-resistant steel plate, which intersect with thin plates.

There is also the material of steel plate. Not all steel plates are the same, the materials are different, and the steel plates are used in different places.

(1)40Cr low hardenability quenched and tempered steel: This kind of steel has a critical oil quenching diameter of 30 mm ~ 40 mm, and is used to manufacture important parts with general size.

(2)35CrMo medium-hard alloy quenched and tempered steel: The critical diameter of oil quenching for this kind of steel is 40 mm ~ 60 mm Adding molybdenum can not only improve hardenability, but also prevent the second kind of temper brittleness.

(3) 40CrNiMo alloy quenched and tempered steel with high hardenability: the critical oil quenching diameter of this kind of steel is 60mm- 100mm, and most of them are Cr-Ni steel. Adding proper amount of molybdenum to Cr-Ni steel not only has good hardenability, but also can eliminate the second kind of temper brittleness.

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