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Calculation formula of section area of round steel bar and its weight scale

Formula for calculating the section area of round steel bar

To find the sectional area of a plane circle from its radius, S=π r2 is 3.14×r×r = area 2

π is PI =3.14, and r is the radius of the circle

Examples:

The diameter of a steel bar is 35MM, seek its area?

A: 3.14 * 17.5 * 17.5

Area = 961.6252mm

20220305150127 17121 - Calculation formula of section area of round steel bar and its weight scale


Rebar specification theory weight scale

Dimensions, external weight and allowable deviation of hot-rolled bar (Round bar); Theoretical weight scale of specifications (GB/T14981-94)

The diameter of
mm
Allowable deviation, mm
 
Roundness, mm
 
Cross-sectional area
mm2
Theoretical weight
Kg/m
 
A level precision
Class B precision
C level precision
A level precision
Class B precision
C level precision
5.5
+ / – 0.40

 

+ / – 0.30 + / – 0.15
0.50 or less

On-line calculator

0.40 or less

 

0.24 or less

 

23.8

 

0.187
6.0
28.3

 

0.222
6.5
33.2

 

0.260
7.0
38.5

 

0.302
7.5
44.2

 

0.347
8.0
50.3

 

0.395
8.5
56.7

 

0.445
9.0
63.6

 

0.499
9.5
70.9

 

0.556
10.0
78.5

 

0.617
10.5
+ / – 0.45

 

+ / – 0.35

 

+ / – 0.20

 

0.60 or less
0.48 or less

 

0.32 or less 86.6 0.680
11.0
95.0

 

0.746
11.5
104

 

0.815
12.0
113

 

0.888
12.5
123

 

0.963
13.0
133

 

1.04
13.5
143

 

1.12
14.0
154

 

1.21
14.5
165

 

1.30
15.0
+ / – 0.50

 

+ / – 0.40

 

+ / – 0.25

 

0.70 or less

 

0.56 or less

 

+ / – 0.40 177 1.39
15.5 189 1.48
16.0
201

 

1.58

Calculation formula: Radius x radius x 3.14 x per meter x 0.785

For example: the diameter of 6.0 steel bar, (0.03×0.03×3.14)×100×0.785=0.221841

In parentheses is the cross-sectional area, 3.14 is PI, 100 is centimeters (per meter), and 0.785 is specific gravity per square centimeter, so all values are converted to uniform units for calculation

Round steel theoretical weight scale

General specific gravity of steel:

  • Chromium steel 15CrA 20Cr, 7.74
  • Ordinary carbon steel Q195, Q215, Q235, Q255, Q275 7.85
  • 05F, 08F, 15F 10, 15, 20, 25, 30, 35, 40, 45, 50 7.85
  • Carbon tool steels T7, T8, T9, T10, T12, T13, T7A, T8A, T9A, T10A, T11A, T12A, T13A, T8MnA 7.85
  • Silicon manganese steel 60Si2nMnA 7.85

Specifications of the diameter The weight per meterkg/m The diameter of The weight per meterkg/m
5.5  0.186  13  1.04
0.222  14  1.21
6.5  0.26  15  1.39
0.302  16  1.58
0.395   17  1.78 
0.499  18  2.0
10  0.617  19  2.23
11  0.746  20  2.47
12  0.888  21  2.72
22  2.98  63  24.5
23  3.26  65  26
24  3.55  68  28.5
25  3.85  70  30.2
26  4.17  75  34.7
27  4.49  80  39.5
28  4.83  85  44.5
29  5.18  90  49.9
30  5.55  95  55.6
31  5.92  100  61.7
32  6.31  105  68
33  6.71  110  74.6
34  7.13  115  81.5
35  7.55  120  88.8
36  7.99  125  96.3
38  8.9  130  104
40  9.86  140  121
42  10.9  150  139
45  12.5  160  158
48  14.2  170  178
50  15.4  180  200
53  17.3  190  223
55  18.6  200  247
56  19.3  220  298
58  20.7  250  385
60  22.2 
Formula: Radius x radius x 3.14 x per meter x 0.785

For example: the diameter of 6.0 steel bar, (0.03×0.03×3.14)×100×0.785=0.221841

In parentheses is the cross-sectional area, 3.14 is PI, 100 is centimeters (per meter),

0.785 is the specific gravity per square centimeter, so all values are converted into uniform units for calculation


Rebar theoretical weight scale

Thermal Gadolinium reinforcement (rebar) specification theory weight scale for reinforced concrete complete/per meter

Type d0

(millimeter)

Inside diameter d

(millimeter)

Outside diameter d1

(millimeter)

Theoretical weight

(kg/m)

6 5.75 6.75 0.222
7 6.75 7.75 0.302
8 7.5 9.0 0.395
9 8.5 10.0 0.499
10 9.3 11.3 0.617
12 11 13.0 0.888
14 13 15.5 1.21
16 15 17.5 1.58
18 17 20.0 2.00
20 19 22.0 2.47
22 21 24.0 2.98
25 24 27.0 3.85
28 26.5 30.5 4.83
32 30.5 34.5 6.31
36 34.5 39.5 7.99
40 38.5 43.5 9.87

Source: Network Arrangement – China Steel Bar Manufacturer – Yaang Pipe Industry Co., Limited (www.steeljrv.com)

(Yaang Pipe Industry is a leading manufacturer and supplier of nickel alloy and stainless steel products, including Super Duplex Stainless Steel Flanges, Stainless Steel Flanges, Stainless Steel Pipe Fittings, Stainless Steel Pipe. Yaang products are widely used in Shipbuilding, Nuclear power, Marine engineering, Petroleum, Chemical, Mining, Sewage treatment, Natural gas and Pressure vessels and other industries.)

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