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Steel Plate Weightfinnish_translation.jpg

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The plate thickness as the merchantable quality, is equivalent to calculation. The shape of a plate variates, such the vessel bottom in the pictures and the main girder of the crane. Plate needs designer, which produces technical drawings. Designer has items, which define the quality and thickness of the material.

Physicist asks, what is the specific gravity of the steel plate and draws a circle with calipers. He says the diameter of the circle to be one (1) unit. The plate thickness is also one (1) unit. Steel gravity of this by calculating is 0.785. You may determine the quantities up to you, because the relativity does not matter of them.

3,14.. x 12  x 1 = 0.785
4                      

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Infrmation of the plate thickness and quality transmits to the parts list. By way of proportionality, these values transmits through parts to end product. Values are proportional also when different sized product, but having comparable function. We will come to calculate tasks of this. The products in the images are of demanding steel structures.

 

 

paakannattaja_5t-21m-a.jpgThickness of the plates

The plate thickness can calculate, and there is no need remember them. The plate thicknes was the first thing, of which I understood the issues of proportionality.

0.6 -  0.8 - 1 - 1.2 - 1.5 - 2 - 2.5  -   3  -   4 - 5 - 6 - 8 - 10 - 12 - 15/16 -  20 - 25

0.63 - 0.8 -1 - 1.2 - 1.6 -  2 - 2.5 - 3.15 - 4 - 5 - 6 - 8 -  10 - 12 -   16   -  20 -  25

1.25 x 0.8 = 1                                                                        1.25 x 16 = 20

Steelworks make plates having factor 1,25. When plate thickness 0,8 mm, it is same do we  have 0,75 mm or 0,8 mm thickness of plate. The same of plate thickness 15 and 16 mm. The weight of steel plate is three-dimensional, in which variables are thickness, width and length. In practise the weight is easy to define by a pocket calculator.

 

As a Thumb Rule

One square meter of 1 mm steel plate = 8 kg

 

Steel plates are being made on + thickness tolerance. From steel specific gravity 7,85 we transfer through + tolerance to the relative value 7,85 x 1,03 = 8,0. This is general way defining the steel plate weight. The weight is according to the surface area and plate thickness. When the surface area stay the same and thickness changes, factor 1,25 is being raised to indicated potency. Proportionality in steel plate is clearly noticeable. Of this kind calculation did I  first practise to shape the proportionality.

                                     1.      2.     3.     4.       5.    6.   7.

1 - 1.25 - 1.6 - 2.0 - 2.5 - 3.15 - 4 - 5 - 6.3 -8.0 - 10

Example 1: Plate PL 5 3150 x 2500 mm => 8 kg/m2 x 3.15 m x 2.5 m x 5 = 315 kg

                                                         1.255  = 3.15 m             1,254 = 2,5 m

             8 kg x 5 (1.255  x 1.03) x (1.254 x 1.03)= 316 kg

                                    8 kg x 5 x 1.259  x 1.032 = 316 kg          ( exact weight )

                                                        1,257 = 5 (plate thickness)

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             8 kg x 1.257 x 1.03 x 1.259  x 1.032 = 311 kg

                                        8 x 1.2516 x 1.033 = 311 kg               (differs 1,6 % )

Now the question; what is the factor 1.03?aikadilaatio_099995.jpg

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14.4.2020*10:00 (878 - 545)
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