Angle steel: weight per meter = 0.00785 * (side width + side width – side thickness) * side thickness
Round steel: weight per meter = 0.00617 * diameter * diameter (rebar and round steel are the same)
Flat steel: weight per meter = 0.00785 * thickness * side width
Pipe: weight per meter = 0.02466 * wall thickness * (outer diameter – wall thickness)
Plate: weight per meter = 7.85 * thickness * width
Brass tube: weight per meter = 0.02670 * wall thickness * (outer diameter – wall thickness)
Copper pipe: weight per meter = 0.02796 * wall thickness * (outer diameter – wall thickness)
Aluminum checkered plate: weight per square meter = 2.96 * thickness
Specific gravity of non-ferrous metals: red copper plate 8.9 brass plate 8.5 zinc plate 7.2 lead plate 11.37
The calculation formula of non-ferrous metal plate is: weight per square meter = specific gravity * thickness
How to calculate the weight of rebar of various specifications? Is there a standard? How much is it?
0.617 is the weight per meter of round 10 reinforcement. The weight of reinforcement is directly proportional to the square of diameter (radius).
G/m=0.617*D*D/100
Weight per meter (kg) = diameter of reinforcement (mm) × Diameter of reinforcement (mm) × zero point zero zero six one seven
In fact, the weight of reinforcement commonly used in construction projects is also very simple: Φ 6＝0.222kg, Φ 6.5＝0.26kg, Φ 8＝0.395kg, Φ 10＝0.617kg, Φ 12＝0.888kg, Φ 14＝1.21kg, Φ 16＝1.58kg, Φ 18＝2.0kg, Φ 24＝2.47kg, Φ 22＝2.98kg, Φ 25＝3.85kg, Φ 28＝4.837kg…..
Φ Up to and including 12 Φ Reinforcement of 28 (including 28) generally takes three digits after the decimal point, Φ 14 to Φ 25 reinforcement generally takes two digits after the decimal point:
Φ 6=0.222kg
Φ 8=0.395kg
Φ 10=0.617kg
Φ 12=0.888kg
Φ 14=1.21kg
Φ 16=1.58kg
Φ 18=2kg
Φ 20=2.47kg
Φ 22=3kg
Φ 25=3.86kg
Φ 28=4.83kg
Φ 32=6.31kg
Φ 36=7.99kg
Φ 40=9.87kg
Simple formula for theoretical weight calculation of steel
Flat steel, steel plate and steel strip w ＝ 0.00785 × wide × thick
Square Steel w ＝ 0.00785 × Side length 2
Round steel, wire rod and steel wire W ＝ 0.00617 × Diameter 2
Steel pipe w ＝ 0.02466 × Wall thickness (outer diameter – wall thickness)
Equilateral angle steel w ＝ 0.00785 × Edge thickness (2 edge width – edge thickness)
Unequal angle steel w ＝ 0.00785 × Edge thickness (long edge width + short edge width – edge thickness)
I-beam w ＝ 0.00785 × Waist thickness [height + F (leg width waist thickness)]
Channel steel w ＝ 0.00785 × Waist thickness [height +e (leg width waist thickness)]
remarks:
1. The accurate calculation formulas of angle steel, I-beam and channel steel are very complicated, and the tabulated simple formula is used to calculate the approximate value.
2. F value: 3.34 for general model and with a, 2.65 for B and 2.26 for C.
3. E value: 3.26 for general model and with a, 2.44 for B and 2.24 for C.
4. All lengths are in millimeters
1、 Steel length dimension
The length dimension of steel is the most basic dimension of all kinds of steel, which refers to the length, width, height, diameter, radius, inner diameter, outer diameter and wall thickness of steel. The legal measurement unit of steel length is meter (m), centimeter (CM) and millimeter (mm). In current practice, it is also expressed in inches (″), but it is not a legal unit of measurement.
1. Range and scale of steel
It is an effective measure to save materials. Range sizing means that the length or length multiplied by width is not less than a certain size, or the length or length multiplied by width is delivered within the size range. The production unit can produce and supply according to the size requirements.
2. Indefinite length (usually length)
If the product size (length or width) is within the range specified in the standard and no fixed size is required, it is called indefinite ruler. Indefinite length is also called normal length (full length). For metal materials delivered to varying lengths, they can be delivered within the specified length. For example, if the length of ordinary round steel not more than 25mm is usually specified as 4-10m, the round steel with the length within this range can be delivered.
3. Fixed length
Cut into fixed size according to the order requirements is called fixed length. When delivering according to the fixed length, the delivered metal materials must have the length specified by the demander in the order contract. For example, if it is stated in the contract that the goods shall be delivered according to the fixed length of 5m, the materials delivered must be 5m long, and those shorter than 5m or longer than 5m are unqualified. However, in fact, the delivery cannot be 5m long, so it is stipulated that positive deviation is allowed and negative deviation is not allowed.
4. Double ruler
Cut into integral multiples according to the fixed size required by the order is called Double ruler. When delivering by multiple length, the length of the delivered metal material must be an integral multiple of the length (called single length) specified by the demander in the order contract (plus sawing). For example, if the demander requires the length of a single ruler to be 2m in the order contract, then the length is 4m when it is cut into double ruler and 6m when it is cut into three times ruler, and one or two saws are added respectively. The sawing amount is specified in the standard. Only positive deviation is allowed during delivery of multiple lengths, and negative deviation is not allowed.
5. Short ruler
If the length is less than the lower limit of the indefinite length specified in the standard, but not less than the allowable minimum length, it is called the short length. For example, the standard for steel pipes for water and gas transmission stipulates that 10% of the short length steel pipes (calculated by the number of pieces) of 2 ~ 4m in each batch are allowed. 4m is the lower limit of indefinite length, and the shortest allowable length is 2m.
6. Narrow ruler
The width is less than the lower limit of the indefinite width specified in the standard, but not less than the allowable narrowest width is called narrow ruler. When delivering by narrow ruler, attention must be paid to the narrow ruler proportion and the narrowest ruler specified in relevant standards.
2、 Example of steel length dimension
1. Length dimension of section steel
(1) the standard length of train rail is 12.5m and 25m.
(2) the dimensions of round steel, wire rod and steel wire shall be calibrated in millimeters (mm) of diameter D.
(3) the dimension of square steel shall be calibrated in millimeters (mm) of side length a.
(4) the dimensions of hexagonal and octagonal steel shall be calibrated in mm of the opposite side distance s.
(5) the size of flat steel shall be calibrated in millimeters (mm) of width B and thickness D.
(6) the dimensions of I-beam and channel steel shall be calibrated in millimeters (mm) of waist height h, leg width B and waist thickness D.
(7) the size of equilateral angle steel shall be calibrated by the number of millimeters (mm) corresponding to the equal side width B and side thickness D. The dimension of unequal angle steel shall be calibrated by the number of millimeters (mm) of side width b, B and side thickness D.
(8) the dimension of H-shaped steel shall be calibrated by the number of millimeters (mm) of web height h, flange width b, web thickness t1 and flange thickness T2.
2. Length dimension of steel plate and steel strip
(1) generally, it is calibrated by the number of millimeters (mm) of the thickness d of the steel plate. The steel strip is calibrated by the number of millimeters (mm) of the width B and thickness d of the steel strip.
(2) a single steel plate has different sizes as specified. For example, hot-rolled steel plate has 1mm thick steel plate and 600 wide steel plate × Length 2000 mm; six hundred and fifty × 2000 mm ； seven hundred × 1420 mm ； seven hundred and fifty × 1500 mm ； nine hundred × 1800 mm ； one thousand × 2000 mm, etc.
3. Length dimension of steel pipe
(1) generally, it is calibrated by the number of millimeters (mm) of the outer diameter D, inner diameter and wall thickness s of the steel pipe.
(2) each kind of steel pipe has different sizes, such as 15 kinds of seamless steel pipes with an outer diameter of 50mm and a wall thickness of 2.5 ~ 10mm; Or 29 kinds with the same wall thickness of 5mm and outer diameter of 32 ~ 195mm. For another example, the wall thickness of welded steel pipe with nominal diameter of 25mm includes 3.25mm ordinary steel pipe and 4mm thickened steel pipe.
3、 Steel weight
1. Theoretical weight of steel
The theoretical weight of steel is calculated according to the nominal size and density of steel (formerly known as specific gravity), which is called the theoretical weight. This is directly related to the length, section area and allowable deviation of steel. 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. Actual weight of steel
The actual weight of steel refers to the weight obtained by the actual weighing (weighing) of steel, which is called the actual weight. The actual weight is more accurate than the theoretical weight.
3. Calculation method of steel weight
(1) gross weight is the symmetry of “net weight”, which is the total weight of steel itself and packaging materials. Transportation enterprises calculate freight by gross weight. However, the purchase and sale of steel is calculated by net weight.
(2) net weight is the symmetry of “gross weight”. The weight of steel after deducting the weight of packaging materials from the gross weight, that is, the actual weight, is called the net weight. In the purchase and sale of steel, it is generally calculated according to the net weight.
(3) tare weight refers to the weight of steel packaging materials.
(4) weight ton is the weight unit used when calculating the freight according to the gross weight of steel. The legal unit of measurement is ton (1000kg), long ton (British weight unit 1016.16kg) and short ton (American weight unit 907.18kg).
(5) billing weight is also called “billing ton” or “freight ton”. The weight of steel charged by the transportation department. Different transportation modes have different calculation standards and methods. For example, for railway vehicle transportation, the marked load of the truck used is generally used as the billing weight. Highway transportation charges freight according to the load tonnage of vehicles. The minimum billing weight of railway and highway LCL is several kilograms of gross weight, which will be adjusted when it is insufficient.