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1. Steel is China's basic construction and the completion of the four modernizations can not lack of key supplies, its use is common, a variety of types, according to the cross-section appearance is not the same, steel is generally divided into aluminum profiles, plates, pipe fittings and metal manufacturing four categories, It is also divided into heavy rail, light rail station, large and medium-sized steel, medium channel steel, small and medium-sized steel, cold drawn steel, heat-resistant cast iron, cable, hot rolled strip steel, sheet metal, welding ferrite core, nylon belt, seamless steel pipe, welded steel pipe, metal manufacturing and other types.

2. Building decorative materials - threaded steel, stainless steel wire, stainless steel wire tray, circular steel. Pipe - seamless steel pipe, welded steel pipe. Cold rolled sheet/coil, hot rolled strip, color coated steel (galvanized steel, color coated steel, tinplate, hot plated aluminum zinc), silicon steel sheet, nylon tape. Type - Angle, H section steel, square steel pipe, galvanized flat steel, ball flat steel. Unique steels include alloy structural steel, alloy steel, die steel, spring steel, No. 45 steel, cold-drawn steel, hard stainless steel wire. Steel is an iron-carbon alloy with a carbon content near the middle. In order to ensure its ductility and plastic deformation, the carbon component is generally not more than. In addition to iron and carbon, steel also has silicon, manganese, sulfur, phosphorus and other elements.

3. Classification by forming method: (1) forged steel; (2) Stainless steel castings; (3) Hot rolled steel; (4) Cold drawn steel.

4. It is classified according to the alloy composition, the quenching condition is: a. subeutectoid (ferrite + ferrite); b. Eutectoid (ferrite); c. Hypereutectoid steel (ferrite + cementite); d. Lesley steel (ferrite + cementite).

5. It is classified by main use. Construction steel: a. general carbon steel; b. Low alloy tool steel; c. Building steel. Nitriding steel: a. high frequency hardening steel; b. Induction hardening steel; c. All alloy structural steel; d. Steel for cold plastic deformation molding: including cold die steel, cold rolling steel. Carbon Steel with a hollow cross-section whose length is much greater than the diameter or circumference. Divided into circular, square, rectangular, and irregular steel pipes according to their cross-sectional shapes; Divided by material into carbon structural steel pipes, low alloy structural steel pipes, alloy steel pipes, and composite steel pipes; Classified by purpose, it is used for conveying pipelines, engineering structures, thermal equipment, petrochemical industry, mechanical manufacturing, geological drilling, and steel pipes for high-pressure equipment; According to production processes, seamless steel pipes are divided into seamless steel pipes and welded steel pipes. Seamless steel pipes are further divided into hot-rolled and cold-rolled (drawn) types, and welded steel pipes are further divided into straight seam welded steel pipes and spiral seam welded steel pipes.
Steel pipes are not only used for conveying fluids and powdered solids, exchanging heat energy, manufacturing mechanical parts and containers, but they are also an economical type of steel. Using steel pipes to manufacture building structural grids, pillars, and mechanical supports can reduce weight, save metal by 20-40%, and achieve factory mechanized construction. Using steel pipes to manufacture highway bridges not only saves steel and simplifies construction, but also greatly reduces the area of protective coatings, saving investment and maintenance costs.
By production method
Steel pipes can be divided into two categories according to production methods: seamless steel pipes and welded steel pipes, with welded steel pipes abbreviated as welded pipes.
1. Seamless steel pipes can be divided into hot-rolled seamless pipes, cold drawn pipes, precision steel pipes, hot expanded pipes, cold spun pipes, and extruded pipes according to production methods.
Seamless steel pipes are made of high-quality carbon steel or alloy steel, and can be either hot-rolled or cold-rolled (drawn). Bundled steel pipes
2. Welded steel pipes are divided into furnace welded pipes, resistance welded pipes, and automatic arc welded pipes due to their different welding processes. Due to their different welding forms, they are divided into straight seam welded pipes and spiral welded pipes. Due to their end shapes, they are further divided into circular welded pipes and special-shaped (square, flat, etc.) welded pipes.
Welded steel pipes are made of rolled steel plates welded with butt or spiral seams. In terms of manufacturing methods, they are further divided into welded steel pipes for low-pressure fluid transportation, spiral seam welded steel pipes, directly rolled welded steel pipes, welded pipes, etc. Seamless steel pipes can be used in various industries such as liquid pressure pipelines and gas pipelines. Welded pipes can be used for water pipelines, gas pipelines, heating pipelines, electrical pipelines, etc.
By material
Steel pipes can be divided into carbon pipes, alloy pipes, stainless steel pipes, etc. according to their material (i.e. steel grade).
Carbon pipes can be divided into ordinary carbon steel pipes and high-quality carbon structural pipes.
Classify by connection method
Steel pipes can be divided into smooth pipes (without threads at the pipe end) and threaded pipes (with threads at the pipe end) according to the pipe end connection method.
Car thread pipes are further divided into ordinary car thread pipes and thickened car thread pipes at the pipe ends.
Thickened thread pipes can also be divided into externally thickened (with external threads), internally thickened (with internal threads), and internally and externally thickened (with internal and external threads) thread pipes.
If the thread type is used, the threaded pipe can also be divided into ordinary cylindrical or conical threads and special threads.
In addition, according to user needs, car wire pipes are generally delivered with pipe joints.
According to coating characteristics
Steel pipes can be divided into black pipes (uncoated) and coated pipes based on their surface coating characteristics.
Coated pipes include galvanized pipes, aluminum plated pipes, chrome plated pipes, aluminized pipes, and other alloy coated steel pipes.
Coated pipes include outer coated pipes, inner coated pipes, and inner and outer coated pipes. The commonly used coatings include plastic, epoxy resin, coal tar epoxy resin, and various glass type anti-corrosion coating materials. Galvanized pipes are further divided into KBG pipes, JDG pipes, threaded pipes, etc
By purpose
1. Pipes for pipelines. For example: seamless pipes for water, gas, and steam pipelines, oil transportation pipes, and pipes for oil and natural gas pipelines. Agricultural irrigation faucets with pipes and sprinkler pipes, etc.
2. Pipes for thermal equipment. Boiling water pipes and superheated steam pipes used in general boilers, as well as superheated pipes, large smoke pipes, small smoke pipes, arch brick pipes, and high-temperature and high-pressure boiler pipes used in locomotive boilers.
3. Mechanical industry pipes. Such as aviation structural pipes (round pipes, elliptical pipes, flat elliptical pipes), automotive half axle pipes, axle pipes, automotive tractor structural pipes, oil cooler pipes for tractors, square and rectangular pipes for agricultural machinery, transformer pipes, and bearing pipes.
4. Pipes for petroleum geological drilling. For example: petroleum drilling pipes, petroleum drilling rods (square and hexagonal drill rods), drilling rods, petroleum oil pipes, petroleum casings and various pipe joints, geological drilling pipes (core pipes, casings, active drill rods, drilling rods, clamps and pin joints, etc.).
5. Chemical industry pipes. For example: petroleum cracking pipes, pipes for chemical equipment heat exchangers and pipelines, stainless acid resistant pipes, high-pressure pipes for fertilizers, and pipes for transporting chemical media.