The unit of measurement for the theoretical weight of steel is kg (kg).
Its basic formula is:
W (weight kg) =F (sectional area mm2) ×L (length m) ×ρ (density g/cm3) ×1/1000
The density ρ of steel is: 7.85g/cm3, from which the theoretical weight calculation formula of various steels is as follows:
Round steel/wire rod
Unit: kg/m
Calculation formula: W=0.006165× D2
Formula description: D = diameter mm,
Calculation example: the diameter of 100mm round steel, calculate the weight per m. Weight per m =0.006165×1002=61.65kg
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rebar
Unit: kg/m
Calculation formula: W=0.00617× D2
Formula description: D = section diameter mm
Calculation example: section diameter of 12mm rebar, calculated per m weight. Weight per m =0.00617×122 ≈0.89kg
Square steel
Unit: kg/m
Calculation formula: W=0.00785× A2
Formula description: A = edge width mm
Calculation example: the edge width of 20mm square steel, calculate the weight per m. Weight per m =0.00785×202=3.14kg
Flat steel
Unit: kg/m
Calculation formula: W=0.00785× B × D
Formula description: B = edge width, D = thickness mm
Calculation example: flat steel with edge width of 40mm and thickness of 5mm, calculate the weight per m. Weight per m =0.00785×40×5=1.57kg
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Six Angle steel
Unit: kg/m
Calculation formula: W=0.006798× S2
Formula description: S = opposite distance mm
Calculation example: a six-angle steel with a distance of 50mm on the opposite side is calculated for weight per m. Weight per m =0.006798×502=16.995kg
Eight Angle
Unit: kg/m
Calculation formula: W=0.0065× S2
Formula description: S = opposite distance mm
Calculation example: for an octagonal steel with an edge distance of 80mm, calculate the weight per m. Weight per m =0.0065×802=41.6kg
Equal Angle steel
Unit: kg/m
Calculation formula: W=0.00785×[D (2B — D) +0.215 (R2 — 2R2)]
Formula description: B = edge width, D = edge thickness, R= inner arc radius, R= end arc radius (outer arc)
Calculation example: find the weight per m of 20mm×4mm equilateral Angle steel. The R of 4mm×20mm equilateral Angle steel is found to be 3.5 and 1.2 in the metallurgical product catalogue, then the weight per m =0.00785×[4× (2×20 — 4) +0.215× (3.52 — 2×1.22)]=1.15kg
Unequal Angle steel
Unit: kg/m
Calculation formula: W=0.00785×[D (B+ B — D) +0.215 (R2 — 2R2)]
Formula description: B= long side width, B= short side width, D = edge thickness, R= inner arc radius, R= end arc radius
Calculation example: Calculate the weight per m of 30mm×20mm×4mm unequal Angle steel. The R of 30×20×4 unequal Angle steel is found to be 3.5 and 1.2 in the catalogue of metallurgical products, then the weight per m =0.00785×[4× (30+20 — 4) +0.215× (3.52 — 2×1.22)]=1.46kg
Channel steel
Unit: kg/m
Calculation formula: W=0.00785×[HD + 2T (B-D) +0.349 (R2 — R2)]
Formula description: H = height, B = leg length, D = waist thickness, T = average leg thickness, R= inner arc radius, R= end arc radius
Calculation example: calculate the weight per m of 80mm×43mm×5mm channel steel. It is found from the metallurgical product catalog that the channel steel T is 8, R is 8, R is 4, then the weight per m =0.00785×[80×5+2×8× (43-5) +0.349× (82-42)]=8.04kg
I iron
Unit: kg/m
Calculation formula: W=0.00785×[HD + 2T (B-D) +0.615 (R2 — R2)]
Formula description: H = height, B = leg length, D = waist thickness, T = average leg thickness, R= inner arc radius, R= end arc radius
Calculation example: Calculate the weight per m of 250mm×118mm×10mm I-beam. From the metal material manual, it is found that the I-beam T is 13, R is 10, R is 5, then the weight per m =0.00785×[250×10+2×13× (118 — 10) +0.615× (102 — 52)]=42.03kg
The steel plate
Unit: kg/m2
Calculation formula: W=7.85×d
Formula description: D = thick
Calculation example: the thickness of 4mm steel plate, calculate the weight per m2. Weight per m2 =7.85×4=31.4kg
Steel tubes (including seamless and welded)
Unit: kg/m
Calculation formula: W=0.02466×S (D-S)
Formula description: D= outer diameter, S= wall thickness
