What type of steel is generally used in construction sites?

Hello, the commonly used steel for construction is: carbon structural steel.

Low-alloy high-strength structural steel, high-quality carbon structural steel, alloy structural steel. Models are distinguished by yield index Q. Commonly used are Q235-BF, Q345, Q500, etc.

Commonly used steel bars are treated differently, and HRB is commonly used for hot rolling. Commonly used in cold rolling are CRB550 and so on.

According to the different structures on the construction site, the design requirements are different, and the types of steel bars used are also different.

The steel itself is also differentiated according to different emphases.

When you say pile retaining wall, is it a sheet pile wall?

This type of steel has very high strength, and it is also a building material with good comprehensive performance, which is suitable for steel structure production and construction industry.

This type of steel, both in terms of strength and plasticity, is good, and is mainly used in boiler making and various pipe fields.

This kind of steel belongs to low-alloy reinforced steel, which has a certain strengthening effect due to the presence of alloying elements, has good plastic toughness, and has the characteristics of low temperature resistance.

The properties of this type of steel are actually similar to those of the 20mnsi model, but there will be a difference in size, and it is a hot-rolled ribbed steel bar.

Steel is generally divided into four categories, profiles, plates, building materials, and pipes.

Among them, the material of profiles and plates is mainly classified as Q235B, Q345B and Q355B, while the main material of building materials is HRB400E, and the material of pipes is mainly Q235B. The types of profiles are H-beam, I-beam, channel steel, and angle steel. Among them, the plates include medium and heavy plates, pattern plates, pattern rolls, and open plates.

Classification:

According to the use, carbon steel can be divided into three categories: carbon structural steel, carbon tool steel and free-cutting structural steel. Carbon structural steel can be divided into two types: building structural steel and machine-made structural steel.

According to the carbon content, carbon steel can be divided into low carbon steel (WC), medium carbon steel (WC) and high carbon steel (WC>. According to the phosphorus and sulfur content, carbon steel can be divided into ordinary carbon steel (higher phosphorus and sulfur), high-quality carbon steel (lower phosphorus and sulfur) and high-grade high-quality steel (lower phosphorus and sulfur).

Generally, the higher the carbon content in carbon steel, the higher the hardness and higher the strength, but the plasticity is reduced.

1. Construction steel can usually be divided into steel for steel structures and steel for reinforced concrete structures.

2. The steel used in steel structure mainly includes ordinary carbon structural steel and low-alloy structural steel. The varieties include section steel, steel pipes and steel bars. There are angle steel, I-beam and channel steel in section steel.

3. The steel bars for reinforced concrete structures can be divided into hot-rolled steel bars, heat-treated steel bars, cold-drawn steel bars, cold-drawn low-carbon steel wires and steel strand pipes according to the processing method; According to the surface shape, it can be divided into smooth steel bar and thread; According to the variety of steel, it can be divided into low carbon steel, medium carbon steel, high carbon steel and alloy steel. The strength of steel bars in China can be divided into five levels: I, V and V.

4. Hot-rolled steel bars are generally commonly used in construction projects. Bright round steel bar HPB300 is used for plate and wall reinforcement, and thread HRB335 and HRB400 are used for wall, column and beam reinforcement.

The steel models are:

The types of profiles are H-beam, I-beam, channel steel, and angle steel. Among them, the plates include medium and heavy plates, pattern plates, pattern rolls, open plates, etc.

The material of profiles and plates is mainly classified as Q235B, Q345B and Q355B.

The main material of building materials is HRB400E, and the material of pipes is mainly Q235B.

Steel is a material of a certain shape, size, and properties that ingots, billets, or steel are made by pressure processing. Most steel processing is carried out by pressure processing, which causes plastic deformation of the processed steel (billets, ingots, etc.). According to the different processing temperatures of steel, it can be divided into two types: cold working and hot working.

Applications of Steel:

Medium and heavy plate refers to the thickness of the steel plate, the thickness is called the thick plate, and the thickness exceeds the extra thick plate. Uses: Medium and heavy plates are mainly used in construction engineering, machinery manufacturing, container manufacturing, shipbuilding, bridge construction, etc.

It can also be used to manufacture various containers, furnace shells, furnace plates, bridges and automobile static steel plates, low-alloy steel plates, general steel plates, boiler steel plates, pressure vessel steel plates, pattern steel plates, automobile girder steel plates, tractor parts and welded components. For medium and heavy plate practitioners, there is more storage of China Iron and Steel Spot Network, which is a unified platform for querying steel spot resources across the country.

Specific applications: Steel plates for bridges: used for large railway bridges. It is required to withstand dynamic load, impact, vibration, corrosion resistance, etc., such as: Q235Q, Q345Q, etc.

Shipbuilding steel plate: used in the manufacture of marine and inland ship hulls. It requires high strength, plasticity, toughness, cold bending performance, welding performance, and corrosion resistance. Such as: A32, D32, A36, D36, etc.

The commonly used steel in construction includes section steel, steel plate, steel strip, steel strip and steel bar.

Section steel: hot-rolled H-beam, I-beam, channel steel, angle steel, steel pipe, rectangular pipe, etc. Intensity grades Q235, Q345.

Steel plates, steel strips and belts: steel plates of various thicknesses, flat bars and square bars of various sizes. Strength class Q235, Q345 (steel plate only).

Reinforcement: 1Hot-rolled yuan steel of various diameters. Cut-to-length length and reel**. Strength grades HPB235, HPB300.

Various diameters of hot-rolled oranges are sold ribbed. Cut-to-length length**. Strength grades HRB335, HRB400, HRB500, etc.

Rebar: The general length of rebar Qingcheng is 9m, 12m, 9m long thread is mainly used for road construction, 12m long thread is mainly used for bridge construction. The specification range of the thread is generally 6-50mm, and the country allows deviation.

There are three types of rebar according to the strength: HRB335, HRB400 and HRB500.

Round bar: As the name suggests, round bar is a solid long steel with a circular cross-section, which is divided into three types: hot-rolled, forged and cold-drawn. There are many materials for round bars, such as:

, Q CRMO, 40CRNIMO, GCR CR2W8V, 20CrMnTi, 5CrMNMO CR, 40CR, 20CRMO, 35CRMO, etc. The specifications of hot-rolled round steel are millimeters, and millimeters belong to small round steel, which are bundled with straight bars and used as steel bars, screw round bolts and various mechanical parts; Round bars larger than 25 mm are mainly used to make mechanical parts or seamless steel tube blanks.

Wire rod: The common types of wire rod are divided into Q195, Q215 and Q235 kinds, but there are only two kinds of wire rods for construction steel, Q215 and Q235, and the specifications that are generally commonly used have a diameter diameter of 10mm, and the largest wire rod in China can reach a diameter of 30mm. In addition to being used as reinforcement for building reinforced concrete, wire rod can also be used for wire drawing and net wire.

Screw: Snail is a rebar coiled together like a wire, which is a kind of construction steel. Rebar is widely used in various building structures, and the advantage of coiled snail compared with rebar is: rebar is only 9-12, and coiled snail can be arbitrarily intercepted according to the needs of use.

Commonly used steel in construction and engineering:

Rebar and wire.

The steel bars used in the structure are often divided into hot-rolled steel bars and cold-worked steel bars according to different processing methods.

1) Hot-rolled steel bars. The finished steel bar that has been formed by hot rolling and naturally cooled is called hot rolled steel bar.

Hot-rolled steel bars are divided into round steel bars and ribbed steel bars according to their shape. Ribbed steel bars are different according to the cross-sectional form of ribs, including crescent rib steel bars, spiral ribs, herringbone ribs and other high-ribbed steel bars. According to different steel grades, hot-rolled steel bars are carbon steel bars and ordinary low-alloy steel bars.

According to the strength grade of the reinforcement, it is divided into four grades: I, II, III and IV. The grade I steel bar is a smooth round steel bar made of carbon steel, and the steel bar grade is HPB235; Grades II, III and IV are ribbed steel bars made of low-alloy steel, and their grades are HRB335, HRB400 and HRB500.

Class I-III hot-rolled steel bars have good welding performance, good plasticity and toughness, and are suitable for non-prestressed concrete structures with low strength requirements. Prestressed concrete structures require the use of steel with higher strength as stressed reinforcement.

2) Cold-drawn steel bars. The hot-rolled steel bar is fixed at one end at room temperature, and the other end is elongated, so that the stress exceeds the yield point until plastic deformation occurs, which is called cold drawing processing. The yield point and tensile strength of the steel bar after cold drawing can be increased by 20%-30%, such as aging treatment (i.e., natural volume of 15-20d or heating to 100-200 after cold drawing, and holding heat for a period of time) its yield point and tensile strength are further improved, but the plasticity and toughness are reduced accordingly.

Cold-drawn grade I steel can be used as non-prestressed tensile steel bar, and cold-drawn class II, III and IV can be used as prestressed steel bar.

3) Cold-drawn low carbon steel wire. The steel wire is made by rolling a hot-rolled disc rod with a diameter of Q235 (or Q215) through a wire drawing machine for many times and vigorously cold drawing.

According to the Code for Acceptance of Construction Quality of Concrete Structure Engineering (GB50204-2002), cold-drawn low-carbon steel wire is divided into two grades: A and B, Grade A is used for prestressed steel wire, and Grade B is used as non-prestressed steel wire, such as welded mesh, welded skeleton, structural steel bar, etc.

Cold-rolled rebar. Cold-rolled ribbed steel bar: Cold-rolled ribbed steel bar is a steel bar with three or two crescent-shaped cross ribs on its surface after cold rolling or cold drawing with hot-rolled rod as the base metal.

Cold-rolled belt auxiliary steel bars in reinforced concrete structures and prestressed concrete structures can be selected according to the following provisions:

Class 550 steel bars should be used as stressed main reinforcement, erection reinforcement, stirrups and structural reinforcement in reinforced concrete structural components.

Class 650 and grade 800 steel bars should be used as the stressed main reinforcement in prestressed concrete structural components.

In addition, the concrete strength grade of reinforced concrete structures using cold-rolled ribbed steel bars should not be lower than C20; The concrete strength grade of the prestressed concrete structural elements should not be lower than C30.

Note: The concrete strength grade of structural components in indoor high humidity or open air environment shall not be lower than C30.

The strength standard value, strength design value and elastic modulus of concrete should be adopted in accordance with the relevant provisions of the current national "Code for Design of Concrete Structures (GB500L0-2002)".

Introduction: Around our lives, we can see many magnificent buildings of different architectural styles. And these magnificent buildings are built using different building steel, different building steel lines will be placed in different places, play different roles, so what are the models of building steel in life?

The buildings we usually see, from high-rise buildings to small households, are inseparable from the important role played by building steel in their interior. Since it's so important, what are its models and specifications? Which ones are more practical?

Around us, construction steel can be seen everywhere, and it can be divided into steel for steel structure and steel for civil engineering. The steel used in steel structure is mainly low-alloy steel and ordinary structural steel, while the steel used in civil engineering is generally rebar and round steel.

It is hidden in our building, the building is different, the building steel model to be used is definitely not the same, its model is divided into many kinds, steel structure steel is divided into low alloy steel and ordinary structural steel, in addition to H-shaped steel, angle steel and so on; Civil steel mainly includes rebar, round steel and wire rod and so on. We will introduce some of the more common construction steel models.

CommonConstruction steel type.

1. Carbon structural steel

Carbon structural steel is a kind of carbon steel, its use is mostly used in railways, bridges and other types of construction projects, can also manufacture some mechanical parts and half of the weldments that do not require heat treatment, carbon structural steel can be divided into ordinary carbon structural steel and high-quality carbon structural steel, its carbon content is mostly between, with high strength, plasticity, toughness and other excellent punching grip judgment points, many uses, the amount is also larger. General use does not need to undergo heat treatment, can be used directly in the ** state.

CommonConstruction steel type. 2. Low-alloy steel

Low-alloy steel is based on carbon structural steel, and some alloying elements are added to the production process, but the total amount of alloy added is less than 5%, so it is called low-alloy steel.

Low-alloy steel is generally used in some construction projects such as the construction of bridges, and its use stress is higher than that of carbon structural steel according to the proportional relationship of the yield point of the steel. In the process of use, in order to make it easier to process it into a working part, its forming performance should be relatively good. And if welded properly, most low-alloy steels can be welded well.

CommonConstruction steel type. 3. Rebar

Rebar, as the name suggests, has a thread-like pattern on this type of steel. It is made of some alloys added in the production process, which has high strength and good toughness. It is widely used in some large, heavy and high-rise building structures, and has a strong bonding ability with concrete, which can better withstand external forces.

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