Some common weight calculation formulas for metal materials

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Common formulas for calculating the weight of various metal materials:
Weight of round steel (kg) = 0.00617 × diameter × diameter × length
Weight of square steel (kg) = 0.00785 × side width × side width × length
Weight of hexagonal steel (kg) = 0.0068 × distance between opposite sides × distance between opposite sides × length
Weight of octagonal steel (kg) = 0.0065 × distance between opposite sides × distance between opposite sides × length
Weight of threaded steel bars (kg) = 0.00617 × calculated diameter × calculated diameter × length
Weight of angle steel (kg) = 0.00785 × (side width + side width – thickness) × thickness × length
Weight of flat steel (kg) = 0.00785 × thickness × side width × length
Weight of steel pipes (kg) = 0.02466 × wall thickness × (outer diameter – wall thickness) × length
Weight of steel plates (kg) = 7.85 × thickness × area
Weight of round copper bars (kg) = 0.00698 × diameter × diameter × length
Weight of round brass bars (kg) = 0.00668 × diameter × diameter × length
Weight of round aluminum bars (kg) = 0.0022 × diameter × diameter × length
Weight of square copper bars (kg) = 0.0089 × side width × side width × length
Weight of square brass bars (kg) = 0.0085 × side width × side width × length
Weight of square aluminum bars (kg) = 0.0028 × side width × side width × length
Weight of hexagonal copper bars (kg) = 0.0077 × distance between opposite sides × distance between opposite sides × length
Weight of hexagonal brass bars (kg) = 0.00736 × side width × distance between opposite sides × length
Weight of hexagonal aluminum bars (kg) = 0.00242 × distance between opposite sides × distance between opposite sides × length
Weight of copper plates (kg) = 0.0089 × thickness × width × length
Weight of brass plates (kg) = 0.0085 × thickness × width × length
Weight of aluminum plates (kg) = 0.00171 × thickness × width × length
Weight of round copper pipes (kg) = 0.028 × wall thickness × (outer diameter – wall thickness) × length
Weight of round brass pipes (kg) = 0.0267 × wall thickness × (outer diameter – wall thickness) × length
Weight of round aluminum pipes (kg) = 0.00879 × wall thickness × (outer diameter – wall thickness) × length

Note: In these formulas, the unit of length is meters, and the unit of area is square meters; all other units are millimeters. The product of the calculated weight and the material price gives the material cost. Adding surface treatment costs, labor costs for each processing step, packaging materials, shipping fees, taxes, and interest yields the final quote (FOB). Specific gravities of common materials: Iron = 7.85, Aluminum = 2.7, Copper = 8.95, Stainless steel = 7.93. Simple formula for calculating the weight of stainless steel: Weight per square meter of stainless steel plate (kg) = Specific gravity × Thickness (mm) × Width (mm) × Length (m). Weight per meter of 304 and 321 pipes (kg) = 0.02491 × Wall thickness (mm) × (Outer diameter – Wall thickness) (mm). Weight per meter of 316L and 310S pipes (kg) = 0.02495 × Wall thickness (mm) × (Outer diameter – Wall thickness) (mm). Weight per meter of stainless steel bars (kg) = Diameter (mm) × Diameter (mm); for nickel-based stainless steels: 0.00623 ； Chromium stainless: 0.00609) The unit used for calculating the theoretical weight of steel is kilogram (kg). Its basic formula is: W (weight, kg) = F (cross-sectional area, mm²) × L (length, m) × ρ (density, g/cm³) × 1/1000. The theoretical weight calculation formulas for various types of steel are as follows: For round bars and wire rods (kg/m), W = 0.006165 × d × d, where d is the diameter in mm. To find the weight per meter for a round bar with a diameter of 100 mm… Weight per m = 0.006165 × 100² = 61.65 kg of rebar (kg/m). W = 0.00617 × d × d, where d is the diameter of the cross-section in mm. For rebar with a cross-sectional diameter of 12 mm, calculate the weight per meter. Weight per m = 0.00617×12² = 0.89 kg for square steel (kg/m). W = 0.00785×a×a; where a is the width in mm. Calculate the weight per m for square steel with a width of 20 mm. Weight per m = 0.00785 × 20² = 3.14 kg for flat steel (kg/m). W = 0.00785 × b × d, where b is the width in mm and d is the thickness in mm. For flat steel with a width of 40 mm and a thickness of 5 mm, calculate the weight per meter. Weight per m = 0.00785 × 40 × 5 = 1.57 kg. Weight of hexagonal steel (kg/m): W = 0.006798 × s × s, where s is the distance between opposite sides in mm. Calculate the weight per meter for hexagonal steel with a distance of 50 mm between opposite sides. Weight per m = 0.006798 × 502 = 17 kg. Weight of octagonal steel (kg/m): W = 0.0065 × s × s, where s is the distance between opposite sides. For octagonal steel with a distance of 80 mm between opposite sides, calculate the weight per meter. Weight per meter = 0.0065 × 802 = 41.62 kg for equilateral angle steel (kg/m). W = 0.00785 × d(2b–d) + 0.215(R²–2rb), where d is the side width, thickness is the side thickness, R is the inner arc radius, and r is the end arc radius. Calculate the weight per meter for 20mm×4mm equilateral angle steel. From the metallurgical product catalog, it can be found that for equal-angle steel with dimensions of 4mm×20mm, R is 3.5 and r is 1.2; thus, the weight per meter is 0.00785× = 1.15 kg per meter for such equal-angle steel. The formula for calculating weight is W = 0.00785×d(B + b – d) + 0.215(R² – 2rB), where B is the width of the longer side, b is the width of the shorter side, d is the thickness of the side, R is the radius of the inner arc, and r is the radius of the end arcs. Calculate the weight per meter for equal-angle steel with dimensions of 30mm×20mm×4mm. From the metallurgical product catalog, it can be found that for the irregular angle steel with dimensions 30×20×4, the value of R is 3.5 and r is 1.2; therefore, the weight per meter is 0.00785 × = 1.46 kg. For channel steel, the weight per meter is given by W = 0.00785 × hd + 2t(b–d) + 0.349(R²–rh), where h is the height, b is the length of each leg, d is the thickness of the web, t is the average thickness of the legs, R is the radius of the inner arc, and r is the radius of the end arcs. Calculate the weight per meter for a channel steel piece with dimensions 80mm×43mm×5mm. From the metallurgical product catalog, it can be found that for this channel steel, t is 8, R is 8, and r is 4; thus, the weight per meter is 0.00785×8 = 8.04 kg. For an I-beam, the weight per meter (in kg/m) is calculated as 0.00785×hd + 2t(b–d) + 0.615(R²–rh), where h is the height, b is the length of the legs, d is the thickness of the web, t is the average thickness of the legs, R is the radius of the inner curve, and r is the radius of the end curves. The weight per meter for an I-beam with dimensions of 250mm×118mm×10mm can be determined using this formula. According to the metal materials manual, for this I-beam, t is 13, R is 10, and r is 5; thus the weight per meter is 0.00785 × = 42.03 kg. For steel plates, the weight per m² is given by W = 7.85 × d, where d is the thickness. For a steel plate with a thickness of 4 mm, calculate its weight per m². Weight per m² = 7.85×4 = 31.4 kg for steel pipes (including seamless and welded pipes) (kg/m). W = 0.02466×S(D–S), where D is the outer diameter and S is the wall thickness. For a seamless steel pipe with an outer diameter of 60 mm and a wall thickness of 4 mm, calculate the weight per m. Weight per m = 0.02466×4×(60–4) = 5.52 kg