normal align=center>圆钢直径d

normal align=center>方钢边长a

normal align=center>mm

normal align=center>理论重量，kg／mm

normal align=center>圆钢直径d

normal align=center>方钢边长a

normal align=center>mm

normal align=center>理论重量，kg／mm

normal align=center>圆钢

normal align=center>方钢

normal align=center>圆钢

normal align=center>方钢

normal align=center>5.5

normal align=center>O.186

normal align=center>0.237

normal align=center>15

normal align=center>1.39

normal align=center>1.77

normal align=center>6

normal align=center>0.222

normal align=center>O.283

normal align=center>16

normal align=center>1.58

normal align=center>2.O1

normal align=center>6.5

normal align=center>O.260

normal align=center>O.332

normal align=center>17

normal align=center>1.78

normal align=center>2.27

normal align=center>7

normal align=center>0.302

normal align=center>0.385

normal align=center>18

normal align=center>2.OO

normal align=center>2.54

normal align=center>8

normal align=center>0.395

normal align=center>0.502

normal align=center>19

normal align=center>2.23

normal align=center>2.83

normal align=center>9

normal align=center>O.499

normal align=center>0.636

normal align=center>20

normal align=center>2.47

normal align=center>3.14

normal align=center>10

normal align=center>O.617

normal align=center>O.785

normal align=center>21

normal align=center>2.72

normal align=center>3.46

normal align=center>11

normal align=center>0.746

normal align=center>O.950

normal align=center>22

normal align=center>2.98

normal align=center>3.80

normal align=center>12

normal align=center>0.888

normal align=center>1.31

normal align=center>23

normal align=center>3.26

normal align=center>4.15

normal align=center>13

normal align=center>1.04

normal align=center>1.33

normal align=center>24

normal align=center>3.55

normal align=center>4.52

normal align=center>14

normal align=center>1.21

normal align=center>1.54

normal align=center>25

normal align=center>3.85

normal align=center>4.91

normal align=center>26

normal align=center>4.17

normal align=center>5.31

normal align=center>*68

normal align=center>28.5

normal align=center>36.3

normal align=center>27

normal align=center>4.49

normal align=center>5.72

normal align=center>70

normal align=center>30.2

normal align=center>38.5

normal align=center>28

normal align=center>4.83

normal align=center>6.15

normal align=center>75

normal align=center>34.7

normal align=center>44.2

normal align=center>29

normal align=center>5.18

normal align=center>6.60

normal align=center>80

normal align=center>39.5

normal align=center>50.2

normal align=center>30

normal align=center>5.55

normal align=center>7.06

normal align=center>85

normal align=center>44.5

normal align=center>56.7

normal align=center>31

normal align=center>5.92

normal align=center>7.54

normal align=center>90

normal align=center>49.9

normal align=center>63.6

normal align=center>32

normal align=center>6.31

normal align=center>8.04

normal align=center>95

normal align=center>55.6

normal align=center>70.8

normal align=center>33

normal align=center>6.71

normal align=center>8.55

normal align=center>100

normal align=center>61.7

normal align=center>78.5

normal align=center>34

normal align=center>7.31

normal align=center>9.07

normal align=center>105

normal align=center>68.0

normal align=center>86.5

normal align=center>35

normal align=center>7.55

normal align=center>9.62

normal align=center>110

normal align=center>74.6

normal align=center>95.0

normal align=center>36

normal align=center>7.99

normal align=center>10.2

normal align=center>115

normal align=center>81.5

normal align=center>104

normal align=center>38

normal align=center>8.90

normal align=center>11.3

normal align=center>120

normal align=center>88.8

normal align=center>113

normal align=center>40

normal align=center>9.86

normal align=center>12.6

normal align=center>125

normal align=center>96.3

normal align=center>123

normal align=center>42

normal align=center>10.9

normal align=center>13.8

normal align=center>130

normal align=center>104

normal align=center>133

normal align=center>45

normal align=center>12.5

normal align=center>15.9

normal align=center>140

normal align=center>121

normal align=center>154

normal align=center>48

normal align=center>14.2

normal align=center>18.1

normal align=center>150

normal align=center>139

normal align=center>177

normal align=center>50

normal align=center>15.4

normal align=center>19.6

normal align=center>160

normal align=center>158

normal align=center>201

normal align=center>53

normal align=center>17.3

normal align=center>22.0

normal align=center>170

normal align=center>178

normal align=center>227

normal align=center>*55

normal align=center>18.6

normal align=center>23.7

normal align=center>180

normal align=center>200

normal align=center>254

normal align=center>56

normal align=center>19.3

normal align=center>24.6

normal align=center>190

normal align=center>223

normal align=center>283

normal align=center>*58

normal align=center>20.7

normal align=center>26.4

normal align=center>200

normal align=center>247

normal align=center>314

normal align=center>60

normal align=center>22.2

normal align=center>28.3

normal align=center>220

normal align=center>298

normal align=center> 

normal align=center>63

normal align=center>24.5

normal align=center>31.2

normal align=center>250

normal align=center>385

normal align=center> 

normal align=center>*65

normal align=center>26.0

normal align=center>33.2

normal align=center> 

normal align=center> 

normal align=center>