2-3 storeys high rise sectional steel structure frame prefabricated building

Steel Materials of Steel Structure frame

There are two main types of steel plate: Q235 and Q355.

Q means “bend”, it is for the yield strength.

Q235 is the minimum yield strength 235 Mpa.

Q355 is the minimum yield strength 355 Mpa.

Q235 and Q345 as the popular construction steel materials

They are divided into 4 grades, ABCD. Such as Q235A , Q235B, Q235C, Q235D.

ABCD refers to the impact test grade. A means that it has not been impact tested. B means that it has been impact tested at 20 ° C temperature. C means that it has been impact tested at 0 ° C temperature. And D means that it has been impact tested at low temperature of -20 ° C.

Q235A&Q235B, Q345A&Q345B are the most popular.

Q345 is mainly used for main steel frame. Like column, beam, wind speed resistant column, crane girder...

Q235 is mainly used for secondary steel frame. Like tie bar, brace, vertical/horizontal support...

The choice of material can be according to the design of the structure of your specific circumstances. For example, if the structure is intensity control structure, Q345 can be considered. If the structure is stiffness control structure, you can choose Q235. The price Q345 is a little higher, but because of its high strength, the material can be saved. And the price difference is not great.

Steel Structure Frame

A steel structure is a metal structure made of structural steel members that are connected to each other to carry loads and provide complete rigidity.

Hot-rolled H-section steel is an economical section high efficiency profile with more optimized cross-sectional area distribution and more reasonable strength-to-weight ratio. It is named H steel, because its cross-section as the English letter "H". Hot rolled H-section steel has the advantages of strong bending resistance, simple construction, cost saving and light weight. So now it has been widely applied in steel structure.

Roof and Wall Cladding System

Cladding system in steel structure construction plays an important part. It affects the whole building's energy consumption.

Steel sheet, which is the cheapest without any insulation.

EPS Sandwich Panel, which is good insulated but flammable.

Glass Fiber Sandwich Panel,which is with general insulation but non-flammable.

Rock Wool Sandwich Panel, which is with good insulation and is non-flammable.

Pu sandwich Panel , which is most expensive, with prefect insulation and non-flammable and waterproof.

Connecting Bolts

In the site installation, the steel structure components normally adopt bolt connection for the quick and easy processing. In order to meet the bolt connection requirements, the manufacture needs to make holes in the corresponding positions on the surface of the steel components. And the holes' position and dimension must meet the specification requirements. If the installation has trouble of unqualified holes on the site, it will needs the manufacturing rework. It will cause the extra economic losses.