The latest introduction of section steel

Section steel is a kind of Bar Steel with a certain cross-sectional shape and size, and is one of the four major varieties of steel (plate, tube, profile, wire). According to the cross-sectional shape, the section steel is divided into simple section section steel and complex section section steel(special-shaped steel). The former refers to square steel, round steel, flat steel, angle steel, hexagonal steel, etc.; The latter refers to I-Beams, channel steels, rails, window frame steels, curved section steels, etc.

According to the different smelting quality of steel, section steel is divided into ordinary section steel and high-quality section steel. According to the current metal product catalog, ordinary steel is divided into large section steel, medium section steel and small section steel. Ordinary section steel can be divided into I-beam, channel steel, angle steel, round steel and so on according to its cross-sectional shape.
Large-scale steel: I-beams, channel steels, angle steels, and flat steels are hot-rolled in large-scale steels, and round steel, square steel, and hexagonal steels are forged and cold-drawn in addition to hot-rolling.
I-beams, channel steel, and angle steels are widely used in industrial buildings and metal structures, such as workshops, bridges, ships, agricultural machinery and vehicle manufacturing, transmission towers, and transportation machinery, which are often used together. Flat steel is used in construction sites as bridges, house trusses, fences, power transmission ships, vehicles, etc. Round bars and square bars are used as various mechanical parts, agricultural machinery accessories, tools, etc.
Medium-sized steel: medium-sized steel medium-working, grooved, angle, round, flat steel, similar to large-scale steel.
Small section steel: small section steel medium angle, round, square, flat steel, processing and use are similar to large section steel, small diameter round steel is often used as construction steel.

H-beam application features
The hot-rolled H-beam steel reasonably distributes the height-to-width ratio of the cross-sectional size according to different uses, and has excellent mechanical properties and superior service performance.
The design style is flexible and diverse. With the same beam height, the steel bay can be up to 50% larger than the concrete bay, making the building layout more flexible.
The structure is lightweight. Compared with the self-weight of the concrete structure, it is lighter, and the reduction of the self-weight of the structure reduces the internal force of the structural design, which can make the foundation treatment requirements of the building structure low, the construction is simple, and the cost is reduced.
The steel structure based on hot-rolled H-beam has a scientific and reasonable structure, good plasticity and flexibility, high structural stability, and is suitable for building structures that bear large vibration and impact loads, and has strong ability to resist natural disasters, especially suitable for some building structures with multiple seismic zones. According to statistics, in the world's devastating earthquake disasters of more than 7 magnitude, the steel structure buildings dominated by H-beam are the least damaged.
Increase the effective usable area of the structure. Compared with the concrete structure, the cross-sectional area of the steel structure column is small, which can increase the effective usable area of the building, and can increase the effective usable area by 4-6% depending on the different forms of the building.
Compared with welded H-beam, it can significantly save labor and materials, reduce the consumption of raw materials, energy and labor, have low residual stress, and have good appearance and surface quality.
It is easy to machine, structurally connect and install, and is also easy to dismantle and reuse.
The use of H-beam can effectively protect the environment, which is manifested in three aspects: first, compared with concrete, dry construction can be used, which produces less noise and less dust; Second, due to the reduction of self-weight, the amount of soil taken for foundation construction is small, and the damage to land resources is small, in addition, the amount of concrete is greatly reduced, and the amount of rock excavation is reduced, which is conducive to the protection of the ecological environment; Third, after the service life of the building structure expires, after the structure is dismantled, the amount of solid waste generated is small, and the recycling value of scrap steel resources is high.
The steel structure based on hot-rolled H-beam has a high degree of industrial production, which is convenient for machinery manufacturing, intensive production, high precision, easy installation, easy to ensure quality, and can be built into real house production factories, bridge production factories, industrial plant production factories, etc. The development of steel structure has created and driven the development of hundreds of emerging industries.
The construction speed of the project is fast, the area is small, and it is suitable for all-weather construction, and is less affected by climatic conditions. The construction speed of the steel structure made of hot-rolled H-beam is about 2-3 times that of the concrete structure, and the capital turnover rate is doubled, reducing the financial cost, thereby saving investment. Taking the "Jin Mao Tower" in Pudong, Shanghai, China as an example, the main body of the structure with a height of nearly 400 m was capped in less than half a year, while the steel-concrete structure took two years to complete. 
Angle steel application characteristics
Angle steel: commonly known as angle iron, is a long strip of steel with two sides perpendicular to each other. There are equal angle steel and unequal angle steel. Equilateral angles have two equal side widths, and their specifications are expressed in millimeters of side width× side width × side thickness. For example, "∠30×30×3", which means that the side width is 30 mm and the side thickness is 3 mm. It can also be expressed by the model number, which is the number of centimeters of the side width, such as ∠3#. Model numbers do not indicate differences within the same model.

Reinforced concrete with steel bars
It belongs to small section steel. Including hot-rolled round steel bars for reinforced concrete, thermotherapy steel bars for prestressed concrete, and hot-rolled reinforced steel bars for reinforced concrete. Cold reinforced bars. In addition to round bar, others are also called rebar. Because the surface of the steel is rolled into ears or thread bars during rolling, it is a steel for reinforced concrete in the construction industry. According to the yield point and tensile strength of the material, the steel bar is divided into I., II., III., IV. grade steel bar. The above reinforcements are used directly. The rebar for heat treatment of stressed concrete is a heat-treated threaded steel bar, which has high strength, but is not suitable for welding and spot welding, and the steel bar is made of 40Si2Mn, 48Si2Mn, 45Si2Cr and other steels after heat treatment, with a nominal diameter of 6, 8.2 and 10 mm. Cold-rolled ribbed steel bars are made of Q215, Q235, 24MnTi steel, with a nominal diameter of 4-12 mm. After heat treatment, the steel bar should be rolled into a tray and delivered in a heat treated state.
Agricultural section steel
Agricultural steel mainly refers to special or semi-special steel for agricultural production and agricultural machinery, mainly including: agricultural tool steel: agricultural tool steel is a commonly used steel for rural production of small agricultural tools and general civil cutting tools. It is mainly a variety of round steel and flat steel with small sections.
Agricultural composite steel
Agricultural composite steel is divided into sickle blanks, hoe blanks and kitchen knife blanks, which are used to manufacture sickles, hoes and other small agricultural tools and other household knives (such as kitchen knives, etc.). This kind of composite steel is made of two different compositions of carbon steel hot rolling, the outside is called the body steel has low carbon content, the body steel is soft, tough, shock-resistant, good adhesion, and easy to grind. The cutting edge steel of the middle clamp contains carbon, manganese and other heights, hard and wear-resistant, and the cutting edge of the knife is made after grinding, which is very sharp.
Ploughshare steel
The ploughshares used to manufacture general-purpose machine-drawn plows, horse-drawn plows, main plows and former small plows of ordinary shallow farming tools are generally made of wear-resistant steel with sufficient strength and toughness. China generally uses 65Mn and 65SiMnXt steel to manufacture. In addition, there are special cross-section steels, such as T-shaped steel, Z-shaped steel, arc steel, double-sided reinforced steel, reinforced I-shaped, grass machine blade steel, concave flat steel and grain rod steel.
High-quality profiles
A high-quality profile is a profile that is machined from high-quality steel. It is divided into hot-rolled (forged) high-quality profiles, cold-drawn (dialed) high-quality profiles and other varieties. Hot-rolled (forged) high-quality profiles include carbon structural steel, carbon tool steel, alloy structural steel, spring steel, stainless steel, bearing steel, alloy tool steel, die steel, high-speed tool steel and other varieties. Cold-drawn high-quality profiles include carbon structural steel, carbon tool steel, alloy structural steel, spring steel, stainless steel, bearing steel, alloy tool steel, high-speed tool steel, easy-cut steel, cold heading steel, S/5A and other varieties. S/5A is a product that is commonly used to make artillery shells and bullets.
Military materials
Other varieties are mainly some special high-quality profiles. Including hollow steel, oxygen cylinder material, cold heading steel, industrial pure iron, hot-rolled free-cut steel, D60, S/5A, F18, F11, etc., the latter are all available. High-quality steel is not divided into large, medium and small, round steel and square steel are divided into group spacing according to specifications, such as 8-10mm, 11-15mm, 18-20mm, 205-245mm. The flat bar is broken.