The specifications and models of I-beams are all uniform and fixed, as follows:

10 Series Models: 10#, 12#, 14#, 16#, 18#

20 Series: 20#a, 20#b, 22#a, 22#b, 25#a, 25#b, 28#a, 28#b

30 Series: 30#a, 30#b, 32#a, 32#b, 32#c, 36#a, 36#b, 36#c

40 Series: 40#a, 40#b, 40#c, 45#a, 45#b, 45#c

Series 50 Models: 56#a, 56#b, 56#c

60 Series: 63#a, 63#b, 63#c

Carbon steel*small specification10#。

The specifications are high.×Leg thickness × waist thickness indicates the main dimensions of the specification, which can also be represented by number sizes. For example, an 18# I-beam indicates an I-beam with a height of 18cm.

If the I-beams have the same height, an angle mark can be added after the number.The notation is represented by a, b, or c, such as 36a, 36b, 36c, etc. It is categorized into standard I-beams, light I-beams, and wide flange I-beams.

The wide flange I-beams are further categorized into wide, medium, and narrow flange widths based on the ratio of flange to web height. The specifications for the first two are produced as follows:Oct. 10–60, corresponding to heights of 10cm–60cm.

The standard joint for the I-beam connection uses an angled joint, with the front angle being...30 degrees, two connections, during the safety period, an additional panel is added to each side for reinforcement.

The flanges of H-shaped steel are all of equal thickness, featuring rolled sections as well as composite sections composed of three plates welded together. Standard I-shaped steel typically consists of rolled sections, and due to poor production techniques, the inner edge of the flange has a 1:10 slope.

The rolling process for H-shaped steel differs from that of standard I-beams, which use only a set of horizontal rolling rolls. Since the flanges of H-shaped steel are wider and have minimal slope, an additional set of vertical rolls is required for simultaneous rolling. Consequently, both the rolling process and equipment are more complex compared to standard rolling machines.

Domestically Produced **RollingThe H-beam height is 800mm, exceeding this height requires a welded composite section.

Standard I-beams and light I-beams with varying cross-section flanges are thick at the web section.The external flanges of the H-shaped steel, such as HW, HM, HN, HEA, HEB, and HEM, are of equal cross-section.