Hot rolled ordinary joist steel, also called steel beam, is strip steel with I-shape section.

Hot rolled I-shape beams can be divided into common i-steel and light beams. 

Common i-steel

Main purpose: Ordinary beams are widely used in various building structures, Bridges, vehicles, support and machinery, etc.

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.

3. Advantages

1) Features: fast and flexible to assemble, safe, thermal and noise insulation, water proof and fire prevention;

2) Cost-effective: Fast and easy installation greatly shorten the construction time which reduce the costs

3) Durability: The whole structure is easy in maintenance, which can be used for more than 50 years.

4) Perfect design: Perfect design completely avoids leaks and water seepage. Meanwhile, it's also in line with the national level of fire prevention.

5) Carrying capacity: can resists the impact of strong wind and seismic performance and bears heavy snow loads.

Due to the above advantages, combination of light china steel building structures in construction engineering, railway, petrochemical industry, water conservancy construction highway construction and military engineering and earthquake relief in the fields of temporary is widely used in construction.

4. steel structure design common specifications are as follows:

1) "technical specification for cold formed steel structures" (GB50018-2002)

2) "just construction quality acceptance" (GB50205-2001)

3) "for the welding of steel structure technical specification" (JGJ81-2002-2002 J218)

4) "technical specification for steel structure of high rise civil building" (JGJ99-98)