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Calculation of the Theoretical Weight of Steel Chart







The unit for the calculated theoretical weight of steel is kilo grams (kg). The fundamental equation is as follows:

W (weight, kg ) = F (cross section area, mm2 )× L (length, m )×ρ(density, g/cm3 )× 1/1000

The density of steel is:7.85g/cm3, the equations for calculating the theoretical weight of different kinds of steel are as follows:

Name (unit) Calculation equation Meaning of symbol Calculation example
Round steelBull rod(kg/m) W= 0.006165 ×d 2 d = diameter mm Round steel with diameter of 100 mm, calculate the weight per m. Weight per m= 0.006165 ×1002= 61.65kg
Deformed steel bar (kg/m) W= 0.00617 ×d 2 d= cross-section diameter mm Deformed steel bar with a cross-section diameter of 12 mm,calculate the weight per m. Weight per m = 0.00617 ×12 2 = 0.89kg
Square bar
(kg/m)
W= 0.00785 ×a 2 a= width of the edge, mm Square bar with width of the edge of 20 mm, calculate weight per m.Weight per m = 0.00785 ×202= 3.14kg
Flat steel
(kg/m)
W= 0.00785 ×b ×d b= width of the edge, mm
d= thickness, mm
Flat steel with width of the edge of 40 mm, and thickness of 5mm, calculate weight per m. Weight per m = 0.00785 ×40 ×5= 1.57kg
Hexagonal bar (kg/m) W= 0.006798 ×s 2 s= distance between opposite edges, mm Hexagonal bar with distance between opposite edges of 50 mm, calculate weight per m. Weight per m = 0.006798 ×502= 17kg
Octagonal steel
(kg/m)
W= 0.0065 ×s 2 s= distance between opposite edges, mm Octagonal steel with distance between opposite edges of 80 mm, calculate weight per m. Weight per m = 0.0065 ×802= 41.62kg
Equal-angle bar (kg/m) W= 0.00785 ×[d (2b – d )+0.215 (R2 – 2r 2 )] b= width of the edge
d= thickness of the edge
R= radius of inner arc
r= radius of end arc
Calculate weight per m of an equal-angle bar with size of 20 mm×4mm. R of the 4mm×20 mmequal-angle bar is 3.5, and r is 1.2, as can be found in the catalogue of metallurgical products, then, weight per m = 0.00785 ×[4 ×(2 ×20 – 4 )+0.215 ×(3.52 – 2 ×1.2 2 )]= 1.15kg
Angle steel with unequal legs (kg/m) W= 0.00785 ×[d (B+b – d )+0.215 (R2 – 2 r 2 )] B= width of the longer edge
b= width of the shorter edge
d= thickness f the edge
R= radius of the inner arc
r= radius of the end arc
Calculate the weight per m of an angle steel with unequal legs with size of 30 mm×20mm×4mm. The R of an unequal angle with size of 30 ×20 ×4 is 3.5, r is 1.2,as can be found in the catalogue of metallurgical products, then weight per m = 0.00785 ×[4 ×(30+20 – 4 )+0.215 ×(3.52 – 2 ×1.2 2 )]= 1.46kg
Channel steel (kg/m) W=0.00785 ×[hd+2t (b – d )+0.349 (R2 – r 2 )] h= height
b= length of the leg
d= thickness of the waist
t= average thickness of legs
R= radius of inner arc
r= radius of end arc
Calculate weight per mof a channel steel of size of 80 mm×43mm×5mm. The t of this channel steel is 8, R is 8, and r is 4, as can be found in the catalogue of metallurgical products, then, weight per m = 0.00785 ×[80 ×5+2 ×8 ×(43 – 5 )+0.349 ×(82–4 2 )]= 8.04kg
Steel I-beam
(kg/m)
W= 0.00785 ×[hd+2t (b – d )+0.615 (R2 – r 2 )] h= height
b= length of legs
d= thickness of waist
t= average thickness of legs
R= radius of inner arc
r= radius of end arc
Calculate weight per m of a steel I-beam of a size of 250 mm×118mm×10mm.Thetofthis I-beam is 13, R is 10, and r is 5 , as can be found in the manual of metallurgical materials, then, weight per m =0.00785 ×[250 ×10+2 ×13 ×(118 –10 )+0.615 ×(102 –5 2 )]= 42.03kg
Steel plate (kg/m2) W= 7.85 ×d d= thickness steel plate of a thickness of 4mm, calculate weight per m2. Weight per m2 = 7.85 ×4= 31.4kg
Steel pipe(including seamless steel pipe and welded steel pipe)(kg/m) W= 0.02466 ×S (D – S ) D= outer diameter
S= thickness of the wall
Seamless steel pipe of an outer diameter of 60 mm and thickness of the wall of 4mm,calculate weight per m. Weight per m = 0.02466 ×4 ×(60 –4 )= 5.52kg

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Related References:
Weight of Steels
Stainless Steel Density Calculation Methods
Calculate of wall thickness of pipe
Calculation of the theoretical weight of steel
Weight Conversion Converter Calculator
Stainless Steel Brass Copper Aluminium Weight Calculator
Approximate Weight of Round Square and Hexagonal Steel Bar

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Stainless Steel Tubing and Pipe:

Heat Exchanger Tubes
U Bend Stainless Steel Tubing
Duplex Stainless Steel Pipe
Boiler Tubes, Condenser Tubes
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Corrosion Resistance of Stainless Steel Tubes
Nickel Alloy Seamless Tubes:

UNS N08020 2.4600 Nickel Alloy 20 Seamless Tubing
UNS N02200 2.4066 200 Nickel Alloy Seamless Tubing
UNS N04400 400 Nickel Alloy 2.4360 Nickel Alloy Tubing
UNS N08800 800 Nickel Alloy Seamless Tubes
UNS N08810 800H UNS N08810 Nickel Alloy Seamless Tubes
UNS N08811 800HT Nickel Alloy Seamless Tubes
UNS N08825 825 2.4858 Nickel Alloy Seamless Tubes
UNS N06600 600 2.4816 Nickel Alloy Seamless Tubes
UNS N06625 625 2.4856 Nickel Alloy Seamless Tubes
UNS N10276 C-276 2.4819 Nickel Alloy Seamless Tubing
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