Steel Weight Calculation Formula
Nov 28, 2022
The unit of measurement for calculating the theoretical weight of steel is kg.
The basic formula is:
W (weight kg)=F (sectional area mm2) × L (length m) ×ρ (Density g/cm3) × 1/1000
Density of steel ρ Is 7.85g/cm3, from which the theoretical weight of various steels is calculated as follows ------
Round steel/wire rod：
Calculation unit: kg/m
Calculation formula: W=0.006165 × d2
Formula description: d=diameter mm,
Calculation example: calculate the weight per m of round steel with a diameter of 100mm. Weight per m=0.006165 × 1002=61.65kg
A complete set of steel weight calculation formulas is necessary for the steel market!
Deformed steel bar:
Calculation unit: kg/m
Calculation formula: W=0.00617 × d2
Formula description: d=section diameter mm
Calculation example: for deformed steel bar with section diameter of 12mm, calculate the weight per m. Weight per m=0.00617 × 122 ≈0.89kg
Square steel:
Calculation unit: kg/m
Calculation formula: W=0.00785 × a2
Formula description: a=side width mm
Calculation example: calculate the weight per m of square steel with a side width of 20mm. Weight per m=0.00785 × 202=3.14kg
Flat steel:
Calculation unit: kg/m
Calculation formula: W=0.00785 × b × d
Formula description: b=side width, d=thickness mm
Calculation example: calculate the weight per m of flat steel with side width of 40mm and thickness of 5mm. Weight per m=0.00785 × forty × 5=1.57kg
Hexagonal steel:
Calculation unit: kg/m
Calculation formula: W=0.006798 × s2
Formula description: s=distance from opposite side mm
Calculation example: calculate the weight per m of hexagonal steel with a distance of 50mm from the opposite side. Weight per m=0.006798 × 502=16.995kg
Octagonal steel:
Calculation unit: kg/m
Calculation formula: W=0.0065 × s2
Formula description: s=distance from opposite side mm
Calculation example: calculate the weight per m of octagonal steel with a distance of 80mm from the opposite side. Weight per m=0.0065 × 802=41.6kg
Equilateral angle steel:
Calculation 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: 20mm × Weight per m of 4mm equal leg angle. 4mm from metallurgical product catalogue × R of 20mm equilateral angle steel is 3.5, r is 1.2, then weight per m=0.00785 × [4 × （2 × 20–4）+0.215 × （3.52–2 × 1.22）]=1.15kg
Unequal angle steel:
Calculation 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=side thickness, R=inner arc radius, r=end arc radius
Calculation example: 30mm × 20mm × Weight per m of 4mm unequal angle steel. Find out from the metallurgical product catalogue 30 × twenty × 4. R of unequal angle steel is 3.5, and r is 1.2, so the weight per m=0.00785 × [4 × （30+20–4）+0.215 × （3.52–2 × 1.22）]=1.46kg
U-Steel:
Calculation 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: 80mm × 43mm × Weight per m of 5 mm 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 × eight × （43–5）+0.349 × （82–42）]=8.04kg
I-beam:
Calculation 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: 250mm × 118mm × Weight per m of 10mm I-beam. According to the metal material manual, t is 13, R is 10, r is 5, then the weight per m=0.00785 × [250 × 10+2 × thirteen × （118–10）+0.615 × （102–52）]=42.03kg
Steel plate:
Calculation unit: kg/m2
Calculation formula: W=7.85 × d
Formula description: d=thickness
Calculation example: calculate the weight per m2 of steel plate with a thickness of 4mm. Weight per m2=7.85 × 4=31.4kg
Steel pipe (including seamless steel pipe and welding):
Calculation unit: kg/m
Calculation formula: W=0.02466 × S（D–S）
Formula description: D=outer diameter, S=wall thickness
Calculation example: calculate the weight per m of seamless steel pipe with outer diameter of 60mm and wall thickness of 4mm. Weight per m=0.02466 × four × （60–4）=5.52kg
Weight calculation formula of brass tube:
Formula: (outer diameter wall thickness) × thick × zero point zero two six seven × Length m
Example: Brass tube 20mm × 1.5mm thick × 6m long
Calculation: (20-1.5) × one point five × zero point zero two six seven × 6=4.446kg
Calculation formula of copper tube weight:
Formula: (outer diameter wall thickness) × thick × zero point zero two seven nine six × Length m
Example: red copper tube 20mm × 1.5mm thick × 6m long
Calculation: (20-1.5) × one point five × zero point zero two seven nine six × 6=4.655kg
Calculation formula of aluminum pattern board weight:
Formula: length m × Width m × Thickness mm × two point nine six
Example: Aluminum pattern board 1m wide × 3m long × 2.5mm thick
Calculation: 1 × three × two point five × 2.96=22.2kg
Brass plate: specific gravity 8.5
Copper plate: specific gravity 8.9
Zinc plate: specific gravity 7.2
Lead plate: specific gravity 11.37
Calculation method: specific gravity × Thickness=weight per square meter
