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I beam
Hot rolled ordinary joist steel, also called steel beam, is strip steel with I-shape section. Its section size is represented as waist height (h) x waist thickness (d) mm, such as waist height **mm, waist width **mm. Thick waist is marked as "I-shape". Another tag method is type marked, that is, waist height showed as centimeters, such as 16#. I-shape steel with same height but different waist thickness and legs width different beams will be recognized with type on right side, like #, etc. 

Hot rolled I-shape beams can be divided into common i-steel and light beams. 
(1) Common i-steel 
Main purpose: Ordinary beams are widely used in various building structures, Bridges, vehicles, support and machinery, etc. 
(2) Light beams 
Flange of common i-steel and light beams are gradually becoming thinner from root to the edge with certain angle. Compared with ordinary beams, hot rolling light beams has wider leg and thinner waist in same wait height conditions. Guaranteed the bearing capacity, the light beams have better stability, metal saving and better economic effect than ordinary beams. 
Main use: The same with ordinary beams, it is mainly used in factories, Bridges and other large structures and vehicle manufacturing, etc.

Parameters of the specification 

Size

Height

Wide leg

Deep waist

Heavy body

10#

100

68

4.5

11.261

12#

120

74

5

13.987

14#

140

80

5.5

16.89

16#

160

88

6

20.513

18#

180

94

6.5

24.143

20#a

200

100

7

27.929

20#b

200

102

9

31.069

22#a

220

110

7.5

33.07

22#b

220

112

9.5

36.524

25#a

250

116

8

38.105

25#b

250

118

10

42.03

28#a

280

122

8.5

43.492

28#b

280

124

10.5

47.888

30#a

300

126

9

48.084

30#b

300

128

11

52.794

32#a

320

130

9.5

52.717

32#b

320

132

11.5

57.741

32#c

320

134

13.5

62.765

36#a

360

136

10

60.037

36#b

360

138

12

65.689

36#c

360

140

14

71.341

40#a

400

142

10.5

67.598

40#b

400

144

12.5

73.878

40#c

400

146

14.5

80.158

45#a

450

150

11.5

80.42

45#b

450

152

13.5

87.485

45#c

450

154

15.5

84.55

56#a

560

166

12.5

106.316

56#b

560

168

14.5

115.108

56#c

560

170

16.5

123.9

63#a

630

176

13

121.407

63#b

630

178

15

131.298

63#c

630

180

17

141.189