The rebar model is 4tg, and the beginning is several grades of steel

As shown below:

Rebar is hot-rolled ribbed steel bar.

Colloquial name. The grade of ordinary hot-rolled steel bar consists of HRB and the minimum yield point of the grade. H, R, and B are the first letters of the three words "hotrolled", "ribbed" and "bars", respectively.

Features:

The geometry of the transverse rib of the imported rebar is mainly an ordinary square thread or an ordinary oblique square thread. The geometry of the transverse rib of domestic rebar mainly includes three types: spiral, herringbone and crescent.

The ordering principle of rebar is generally based on meeting the gripping performance requirements required by engineering design, and the mechanical process performance or mechanical strength index is the main one.

The nominal diameter is recommended by the common specifications and standards of construction in China.

It is a series of spiral steel pipes in mm.

The length of supply is divided into two types: fixed length and double ruler. China exports rebar.

The sizing range is 6 12 m, and the sizing range of Japanese rebar is 3 5 10 m.

Generally commonly used construction seamless steel pipes.

It is used with high-quality carbon steel 16Mn, 5MnV and other low-alloy structural steels or 40Cr, 30Cr Mnsi, 45Mn Mnb and other alloy steels.

Equal mild steel made from hot or cold rolling.

Seamless pipes are manufactured primarily for fluid transfer pipelines.

Seamless pipes made of medium carbon steel such as CR are used to make mechanical parts, such as stressed parts of automobiles and tractors. The seepage source is prepared for the general seamless steel pipe to ensure the strength and flattening test. Hot-rolled steel pipes are delivered in hot-rolled or heat-treated condition; Cold rolled is delivered in heat-treated condition.

The rebar table is obtained by calculating the weight of the steel according to the nominal size and density (formerly known as the specific gravity), and the theoretical weight calculated by the formula is different from the actual weight, so it is only used as a reference when estimating. It is calculated according to the theoretical size of the national standard of rebar, which is a little different from the actual weight. The table is as follows:

Rebar is the common name of hot-rolled ribbed steel bar, which is divided into three grades: HRB335, HRB400 and HRB500.

1. The steel bar of HRB335: the design strength of tensile and compressive strength is 300 megapascals, which is widely used in the construction of civil engineering such as houses, bridges and roads;

2. HRB400 steel bar: the design strength of tensile and compressive strength is 360 megapascals, and there shall be no cracks, scars and folds on the surface, which is mainly used for the skeleton of reinforced concrete building components;

3. The steel bar of HRB500: strength, ductility, high temperature resistance, low temperature resistance, seismic performance and fatigue performance are stronger than HRB400, which is mainly used for high-rise, super high-rise buildings, long-span bridges and other high-standard construction projects, and is a product actively recommended by international engineering standards and has been widely used in developed countries.

The grade of ordinary hot-rolled steel bar is composed of HRB and the minimum yield point of the grade, and H, R, and B are the first letters of the three words of hot-rolled, ribbed, and steel bar, respectively.