1. Profile steel is a strip steel with a certain section shape and size.

1. Profile classification:

According to the different smelting quality of steel, the steel is divided into ordinary steel and high quality steel. Ordinary steel is divided into large section steel, medium section steel and small section steel according to the current metal product catalogue. Ordinary steel can be divided into I-beam, channel steel, angle steel, round steel, etc. according to its sectional shape. The specification of the section steel is expressed by the main profile size reflecting the cross-sectional shape. For example, the specification of round steel is expressed in millimeters of diameter; the round steel with a diameter of 30 mm is denoted as Φ 30; the specification of square steel is expressed by the number of millimeters of side; the specification of flat steel is expressed by thickness * width and millimeter; The specifications of steel and channel steel are expressed as high * leg width * waist thickness, and the number is also expressed by the number. The number indicates the height of the centimeter. For example, the 10# I-beam is the I-beam with a height of 100 mm; The width of the side * the width of the side * the number of millimeters of the thickness of the side, can also be expressed by the number. When the same work and channel steel have several different leg widths and waist thicknesses, they are distinguished by a, b, and c after the number, for example, 32a#, 32b#, 32c#, and the like. Ordinary steel is produced from ordinary carbon structural steel and ordinary low alloy structural steel. High-quality steel profiles made from high-quality steel. Although the high-quality steel has many materials, the variety is simple, and most of them are round steel. In addition, there are also square steel, flat steel, hexagonal steel, hollow steel and so on. In addition, the section steel also includes cold-formed steel, which is a section steel formed by ordinary cold carbon steel, high-quality carbon steel or low-alloy steel steel plate or steel strip after a certain cold bending.

2, large steel:

In large steel sections, I-beam, channel steel, angle steel and flat steel are all hot-rolled. In addition to hot rolling, round steel, square steel and hexagonal steel, there are forging and cold drawing. I-beam, channel steel and angle steel are widely used in industrial buildings and metal structures, such as factories, bridges, ships, agricultural machinery and vehicle manufacturing, transmission towers, transportation machinery, and often used together. Flat steel is used as a bridge, frame, fence, power transmission ship, vehicle, etc. in construction and construction. Round steel and square steel are used as various mechanical parts, agricultural machinery parts, tools, etc. Tractor beam channel steel in profiled steel; steel pile steel for hydraulic construction and mining engineering; tractor engineering machinery track plate, concave flat, ball flat steel, etc. These profiled steels can greatly reduce machining, ensure product quality, and save metal due to the shape and size of the part or finished product.

3. Medium-sized steel:

The use of medium-sized steels in medium, trough, angle, round and flat steel is similar to that of large sections. Shaped steel includes 9#, 11#, 12#, miner steel, 18V, 25V, 29V support steel for water conservancy, construction and mining; U-shaped steel, π-shaped steel, various flat steel, etc. In addition, there are also plough steel for the manufacture of agricultural machinery ploughs, elevator guide rails, wheel net steel for the manufacture of automobile wheel nets, and composite flat steel for small farm implements for the manufacture of agricultural tools.

4. Small section steel:

The processing and use of angles, rounds, squares and flat steels in small sections are similar to those of large ones. Small diameter circles are often used as building reinforcement. Shaped steel includes gear ring, horseshoe steel, magnetic pole steel, presser foot plate, shallow channel steel, small channel steel, T-shaped steel, ball flat steel, feed steel, hot-rolled hexagon steel. In addition, there are rivet steel, agricultural tools steel, and window frame steel.

5. Steel bars for reinforced concrete:

It is a small section steel. Including hot-rolled round bars for reinforced concrete, heat-treated bars for prestressed concrete, and hot-rolled bars with reinforced concrete. Cold reinforced bars. In addition to round steel, it is also called rebar. Because the surface of the steel is rolled into ears or thread ribs during rolling, it is a steel for reinforced concrete in the construction industry. The steel bars are grade I, II, III, and IV according to the yield point and tensile strength of the material. The above steel bars are used directly. Prestressed concrete heat-treated steel bars are heat-treated reinforced steel bars with high strength, but not suitable for steel bars for welding and spot welding. Steel bars are made of 40Si2Mn, 48Si2Mn, 45Si2Cr and other steels after heat treatment, nominal diameters 6, 8.2, 10 Millimeter. Cold-rolled ribbed steel bars are made of Q215, Q235, and 24MnTi steels with a nominal diameter of 4-12 mm. After the steel bar is heat treated, it should be rolled into a pan and delivered in a heat treated state.

6. Agricultural steel:

Agricultural steel mainly refers to the special or semi-dedicated steel for agricultural production and agricultural machinery, mainly including: agricultural tools steel: agricultural tools steel is a common steel for rural small agricultural tools and general civilian cutting tools. Mainly small-section round steel, flat steel and other agricultural composite steel: agricultural composite steel split knives, hoe blanks and kitchen knives, used to make small hoes such as trowels and hoes and other domestic knives (such as kitchen knives, etc.). This type of composite steel is hot-rolled from two carbon steels with the same composition. The outer steel is called carbon, which is low in carbon. The bulk steel is soft and tough, has good adhesion and is easy to be sanded. The layer of blade steel in the middle clamp is high in carbon and manganese, hard and wear-resistant, and the cutting edge is made after grinding. It is very sharp plough steel: used for general purpose machine plough, horse-drawn plough, ordinary shallow ploughing The main plough of the farm implement and the ploughshare of the front small plough are generally made of steel that is wear resistant and has sufficient strength and toughness. China generally uses 65Mn and 65SiMnXt steel. In addition, the commonly used agricultural tools are also special section steels, such as T-shaped steel, Z-shaped steel, curved steel, double-sided reinforced steel, strengthened I-shaped, grass machine blade steel, concave steel and steel, etc. .

7, cold-formed steel:

Cold-formed steel is the main material for making lightweight steel structures, and is formed by cold-bending forming of steel plates or steel strips. Its wall thickness can be made not only very thin, but also greatly simplifies the production process and improves production efficiency. It is possible to produce various types of profiles and different materials of cold-formed steel which are difficult to produce by general hot rolling methods and have a uniform wall thickness but a complicated cross-sectional shape. In addition to being used in various building structures, cold-formed steel is also widely used in vehicle manufacturing and agricultural machinery manufacturing. There are many varieties of cold-formed steel, which are divided into sections according to the section, semi-closed and closed. According to the shape, there are cold-formed channel steel, angle steel, Z-shaped steel, square tube, rectangular tube, shaped tube, rolling door, etc. According to GB6725-92, cold-formed steel adopts ordinary carbon structure negative, high-quality carbon structural steel, low alloy structural steel. Steel plate or steel strip is made by cold bending.

8, high quality profiles:

High-quality profiles are profiles made from high-quality steel. Hot-rolled (forged) high-quality profiles, cold-drawn (dial) 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 drawing (dial) 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, etc. Variety. The S/5A is a product that is commonly used to make shells and bullets. Other varieties are mainly special high-quality profiles. Including hollow steel, oxygen bottle material, cold heading steel, industrial pure iron, hot-rolled easy-cut steel, D60, S/5A, F18, F11, etc., the latter are all military materials. High-quality steel is not divided into large, medium and small. Round steel and square steel are grouped according to specifications, such as 8-10mm, 11-15mm, 18-20mm, 205-245mm. Flat steel is divided into large, medium and small flat according to the sectional area. Hexagonal steel is not grouped. However, the group spacing of high-quality steel can not replace the specific specifications, and the specific specifications should be filled in the documents. The specifications of high-quality profiles are simple, and most of them are round steel. In addition, there are two types of high-quality round steel, square steel and hexagonal steel of hot-rolled (forged) such as square steel, flat steel, six-chested steel, hollow steel, and special-shaped steel, which have common dimensional accuracy and high precision. Cold drawn profiles have more precise dimensions and smooth surfaces, and some surfaces are polished and polished. The polished or polished surface of the round steel is called silver bright steel. High-quality profiles are rarely used, and most of them are processed further by the use unit and used after heat treatment. Therefore, in addition to ensuring chemical composition, mechanical properties after heat treatment are also ensured.

9, wire:

Mainly refers to hot-rolled round steel with a diameter of 5-9mm and rebar with a diameter of 10mm or less. Most of them are rolled up into coils by a reeling machine. They are also called wire rods or round wires. They are mainly used as reinforcing materials for reinforced concrete and welded structural parts or for reprocessing (such as threading, formulation, etc.). According to the catalogue of steel distribution, the wire includes ordinary low carbon steel rolled wire rod, electric pad strip, wire rod for blasting line, quenched and tempered threaded wire rod, and high quality wire rod. The most widely used wire rod is mainly ordinary low carbon steel hot rolled wire rod, also known as ordinary wire rod. It is hot rolled from Q195, Q215 and Q235 ordinary carbon steel. The nominal diameter is 5.5-14.0mm, which is generally rolled into each. The weight of the disc is 100-200kg. Now it is rolled on a non-twist high-speed wire rod mill and controlled cooling after rolling. The diameter is 5.5-22.0mm and the maximum disc weight can reach 2500kg. Ordinary wire is mainly used for construction, drawing, packaging, welding rods and manufacturing bolts, nuts, rivets, etc. High-quality wire, only high-quality carbon structural steel hot-rolled wire rods. Such as 08F, 10, 35Mn, 50Mn, 65, 75Mn and the like. Used as raw materials and other structural parts for metal products such as steel wire, other high-quality steel rolled wire. It is customary to include high-quality profiles above 8mm and metal products below 8mm. In addition to the strength requirements of the wire, according to the use of cold bending test, size and other tests, the surface can not be cracked, folded, scars, ears, delamination, inclusions and other defects.

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