Complete works of steel weight calculation formula in kg
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As the calculation formula of steel or non-ferrous metal weight that the engineer should know. Today we sorted them out and hope to collect them. The formula for calculating weight is different for different steels in kg.
1、 Concept of theoretical weight of steel
The theoretical weight of steel is based on the nominal size and density of steel (formerly called specific gravity) the calculated weight is called the theoretical weight. This is directly related to the allowable deviation of steel length, section area and size. Due to the allowable deviation of steel in the manufacturing process, the theoretical weight calculated by the formula is different from the actual weight, so it is only used as a reference for estimation.
2、 Calculation formula of theoretical weight of steel
The unit of measurement for the theoretical weight of steel is kilogram (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 It is 7.85g/cm3, and the calculation formula of theoretical weight of various steels is as follows:
Variety name: round steel / wire rod
Calculation unit: kg / M
Calculation formula: w = 0.006165 × d2
Formula Description: D = diameter mm,
Calculation example: for round steel with diameter of 100mm, calculate the weight per M. Weight per M = 0.006165 × 1002=61.65kg
Variety name: 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
Variety name: Weight calculation formula of square steel
Calculation unit: kg / M
Calculation formula: w = 0.00785 × a2
Formula Description: a = side width mm
Calculation example: for square steel with side width of 20mm, calculate the weight per M. Weight per M = 0.00785 × 202=3.14kg
Variety name: 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
Variety name: Weight calculation formula of hexagonal angle steel
Calculation unit: kg / M
Calculation formula: w = 0.006798 × s2
Formula Description: S = opposite edge distance mm
Calculation example: calculate the weight per m of hexagonal angle steel with a distance of 50mm from the opposite side. Weight per M = 0.006798 × 502=16.995kg
Variety name: calculation formula of octagonal steel
Calculation unit: kg / M
Calculation formula: w = 0.0065 × s2
Formula Description: S = opposite edge distance 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
Variety name: calculation formula of 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 equilateral angle steel. 4mm from metallurgical product catalogue × If r of 20mm equilateral angle steel is 3.5 and R is 1.2, then weight per M = 0.00785 × [4 × （2 × 20–4）+0.215 × （3.52–2 × 1.22）]=1.15kg
Variety name: calculation formula of 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 30 from the catalogue of metallurgical products × twenty × 4. If r of unequal angle steel is 3.5 and R is 1.2, weight per M = 0.00785 × [4 × （30+20–4）+0.215 × （3.52–2 × 1.22）]=1.46kg
Variety name: channel steel calculation formula
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 5mm channel steel. It is found from the metallurgical product catalogue that the channel steel t is 8, R is 8 and R is 4, then the weight per M = 0.00785 × [80 × 5+2 × eight × （43–5）+0.349 × （82–42）]=8.04kg
Variety name: calculation formula of H-section steel
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 × 10mm I-beam weight per M. It is found from the metal material manual that if the I-beam t is 13, R is 10 and R is 5, the weight per M = 0.00785 × [250 × 10+2 × thirteen × （118–10）+0.615 × （102–52）]=42.03kg
Variety name: steel plate calculation formula
Calculation unit: kg / m2
Calculation formula: w = 7.85 × d
Formula Description: D = thickness
Calculation example: for steel plate with thickness of 4mm, calculate the weight per m2. Weight per m2 = 7.85 × 4=31.4kg
Variety name: 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: for seamless steel pipe with outer diameter of 60mm and wall thickness of 4mm, calculate the weight per M. Weight per M = 0.02466 × four × （60–4）=5.52kg
3、 Weight calculation formula of other non-ferrous metals
Other non-ferrous metals include brass plate, copper plate, zinc plate and lead plate. The weight is calculated as follows:
Calculation method: specific gravity × Thickness = weight per square meter (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 formula of brass tube weight
Formula: (outer diameter - wall thickness) × thick × zero point zero two six seven × Length m
Example: brass tube 20mm × 1.5mm thick × 6m (length)
Calculation: (20-1.5) × one point five × zero point zero two six seven × 6=4.446kg
Weight calculation formula of red copper pipe
Formula: (outer diameter - wall thickness) × thick × zero point zero two seven nine six × Length m
Example: red copper pipe 20mm × 1.5mm thick × 6m (length)
Calculation: (20-1.5) × one point five × zero point zero two seven nine six × 6=4.655kg
Weight calculation formula of aluminum flower plate
Formula: length m × Width m × Thickness mm × two point nine six
Example: aluminum flower plate 1m wide × 3M long × 2.5mm thick
Calculation: 1 × three × two point five × 2.96=22.2kg
Knowing the calculation formula of the weight of these steels, I hope it will be helpful to your engineers.
