How is construction steel classified? What use are there?

Construction steel is mainly extracted from ferrous metal materials. Most of the construction steel in China is produced from low-carbon steel, medium-carbon steel and low-alloy steel by boiling steel or killed steel process. Among them, semi-killed steel has been promoted in China. use.

The types of construction steel products are generally divided into several categories such as rebar, round steel, wire rod, coil screw and so on.

1. Rebar

The general length of rebar is 9m and 12m. The 9m long thread is mainly used for road construction, and the 12m long thread is mainly used for bridge construction. The specification range of the thread is generally 6-50mm, and the country allows deviations. There are three types of rebar according to the strength: HRB335, HRB400 and HRB500.

2. Round steel

As the name implies, round steel is a solid long strip of steel with a circular cross-section, which is divided into three types: hot-rolled, forged and cold-drawn. There are many materials for round steel, such as: 10#, 20#, 45#, Q215-235, 42CrMo, 40CrNiMo, GCr15, 3Cr2W8V, 20CrMnTi, 5CrMnMo, 304, 316, 20Cr, 40Cr, 20CrMo, 35CrMo, etc.

The size of hot-rolled round steel is 5.5-250 mm, and the size of 5.5-25 mm is small round steel, which is supplied in straight bundles and used as steel bars, bolts and various mechanical parts; round steel larger than 25 mm is mainly used for Manufacture of mechanical parts or as seamless steel tube billets.

3. Wire

The common types of wire rods are Q195, Q215, and Q235, but there are only two types of wire rods for construction steel, Q215 and Q235. Generally, the commonly used specifications are 6.5mm in diameter, 8.0mm in diameter, and 10mm in diameter. At present, the largest wire rod in my country can reach Diameter 30mm. In addition to being used as reinforcement for building reinforced concrete, the wire can also be used for wire drawing and mesh.

4. Snail

Coiled screw is a kind of steel used for construction. Rebars are widely used in various building structures. The advantages of coiled screws compared to rebars are: the rebars are only 9-12, and the coiled screws can be arbitrarily intercepted according to the needs of use.


Post time: Jul-11-2022