Screw thread steel


Screw thread steel

EN 10025-2 is European standard, EN 10025-2 Carbon Steel is a steel alloy where carbon is the main alloying element.

Carbon steel can be grouped into 3 categories: Low Carbon Steel (also known as Mild Steel), Medium Carbon Steel and High Carbon Steel.

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Deformed bar is the common name of hot rolled ribbed bar. The grade of ordinary hot-rolled steel bar is composed of HRB and the minimum yield point of grade. H. R and B are the English first letters of hot rolled, ribbed and bars respectively.

Hot rolled ribbed steel bars are divided into three grades: Grade II HRB335 (old brand number 20MnSi), grade III HRB400 (old brand numbers 20MnSiV, 20MnSiNb, 20mnti) and grade IV HRB500.

  classification method
There are two commonly used classification methods for rebar: one is to classify rebar according to geometric shape, and classify or type rebar according to the cross-sectional shape of cross ribs and the spacing of ribs. For example, rebar is divided into type I and type II in British Standard (bs4449). This classification mainly reflects the gripping performance of deformed bar. Second, according to the performance classification (grade), for example, in China\'s current executive standard, rebar is (g b1499.2-2007) and wire rod is 1499.1-2008), rebar is divided into three grades according to the strength grade (yield point / tensile strength); In the Japanese industrial standard (Ji sg3112), the screw thread steels are divided into 5 categories according to their comprehensive properties; British Standard (bs4461) also specifies several grades of performance test for deformed steel bars. In addition, deformed steel bars can be classified according to their uses, such as ordinary steel bars for reinforced concrete and heat-treated steel bars for prestressed reinforced concrete.

The specification requirements of deformed steel bar shall be listed in the import and export trade contract. Generally, it shall include the standard brand (type code), nominal diameter, nominal weight (mass), specified length and allowable value of the above indicators of the reinforcement. The deformed steel bar series with nominal diameters of 6, 8, 10, 12, 16, 20, 25, 32, 40 and 50mm are recommended in Chinese standards. The supply length is divided into fixed length and double length. The scale selection range of China\'s export rebar is 6 ~ 12M, and that of Japan\'s rebar is 3.5 ~ 10m; If there are no requirements specified in the contract for domestic screw thread steel, the length is usually 9m and 12m.

Screw thread steel is widely used in civil engineering construction such as houses, bridges and roads. Threaded steel is an indispensable structural material, ranging from public facilities such as highways, railways, bridges, culverts, tunnels, flood control and dams to foundations, beams, columns, walls and slabs of housing buildings. With the deepening of China\'s urbanization and the vigorous development of infrastructure construction and real estate, there is a strong demand for rebar.
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