How many types of steel bars are there? What are the classifications of rebar?

The steel bars commonly used in construction are mainly steel bars, and the mechanical properties of each grade are different, and the higher the grade, the higher the mechanical performance, but the plasticity is reduced, and the bending performance is also reduced.

The current steel bar due to the iron ore raw materials in the international market, the current current is about 6000, and the ** in various places is different.

Commonly used reinforcement:

HPB235 Round Rebar, Grade I Rebar, Yield Strength 235HRB335 Ribbed Rebar, Grade II Rebar, Yield Strength 335HRB400 Ribbed Rebar, Grade III Rebar, Yield Strength 400 Others will not be said, you must see that the final number is the yield strength.

**Not very clear. Thank you.

According to the different production and processing technology, it is divided into hot-rolled steel bar and heat-treated steel bar. Among them, hot-rolled steel bars are low-carbon steel, and ordinary low-alloy steel is rolled at high temperatures. According to its strength, it can be divided into three grades: HPB235, HRB335, HRB400 and RRB400.

I don't know the price.

No matter how good it is, there are no points, and there is no one, I only pass by to brush points.

1. Divided according to the size of the diameter.

Steel wire (diameter 3 5mm), thin steel bar (diameter 6 10mm), thick steel bar (diameter greater than 22mm).

Second, according to the mechanical properties.

grade reinforcement (300 420 grade); grade reinforcement (335 455 grade); Grade bars (400 540) and grade bars (500 630).

Third, according to the production process.

Hot-rolled, cold-rolled, cold-drawn steel bars, as well as heat-treated steel bars made by heat treatment of grade steel bars, the strength is higher than the former.

Fourth, according to the role in the structure.

Compression reinforcement, tension reinforcement, erection reinforcement, distribution reinforcement, stirrups, etc.

The inspection of the reinforcement and the process inspection of the reinforcement joint:

The inspection of the steel bar should first check the brand number and quality certificate of the steel bar; Secondly, the appearance inspection should be done, 5% of the steel bar should be extracted from each batch, and the surface of the steel bar should not be cracked, wounded and stacked, the bump on the surface of the steel bar should not exceed the height of the cross rib, the depth and height of the defect should not be greater than the allowable and deviation of the part, and the bending of each meter of the steel bar should not be greater than four millimeters;

Next, if each batch is less than 60 tons, 2 will be extracted from it, and two sections of each will be intercepted for tensile and cold bending tests respectively. 100 500mm at both ends of the steel bar should be removed when the specimen is intercepted, and the corresponding steel bar should be taken when the specimen is more than 60 tons.

If the results of one test do not meet the requirements, double the number of samples from the same batch is taken for each test. If there is still a sample that is unqualified, the batch of steel bars is unqualified, and the hot-rolled steel bars are brittle, poor welding performance or significantly abnormal mechanical properties during the processing process, and chemical composition analysis and other special inspections should be carried out.

The steel bars used in building structures can be divided into carbon steel and ordinary low-alloy steel according to their different chemical compositions. According to the amount of carbon content, carbon steel is divided into low carbon steel (carbon content, medium carbon steel (carbon content is high carbon steel (. The higher the carbon content, the stronger the steel will be, but the plasticity and weldability will decrease.

Ordinary low-alloy steel is based on carbon steel, adding a small amount of alloying elements, such as manganese, silicon, vanadium, titanium, etc., which can not only effectively improve the strength of the steel, but also make the steel have a certain plasticity and weldability.

According to the different production and processing technology and mechanical properties, the steel bars used in China's reinforced concrete structures and prestressed concrete structures can be divided into hot-rolled steel bars, steel wires, steel strands and heat-treated steel bars. The steel bars used in reinforced concrete structures are hot-rolled steel bars. Hot-rolled steel bars are made of low-carbon steel and ordinary low-alloy steel rolled at high temperatures, and can be divided into the following according to their strength

HPB300 class, denoted by symbol A; HRB335 level, denoted by the symbol B; HRB400 class, denoted by the symbol C; RRB400 class, denoted by the symbol CR. Its grade is a light round steel bar, HRB335 grade and HRB400 grade are ordinary low-alloy hot-rolled crescent pattern deformed steel bars, and RRB400 grade is waste heat treated crescent pattern deformed steel bars. Generally, the diameter of the deformed steel bar is not less than 10mm, and the diameter of the light round steel bar is not less than 6mm.

Prestressed steel bars should be made of steel strands, steel wires, and heat-treated steel bars.

Hello answer, I have seen your question and am querying the relevant information for you, please wait for a while 5. Press the role in the structure: compression reinforcement, tensile reinforcement, erection reinforcement, distribution reinforcement, etc.