Hot rolling process is a metal processing method, mainly used to heat metal to a certain high temperature and plastic deformation through tools such as rollers to achieve the desired shape and size. The hot rolling process is commonly used in steel production and is suitable for most metal materials, especially steel. During the hot rolling process, the metal is heated above the recrystallization temperature (usually between 1000°C and 1300°C), so that the metal's grains rearrange and become more uniform, enhancing its malleability and plasticity.

In the production process of seamless steel pipe, the problem of surface defects often occurs, which is closely related to its material, production process, processing environment and other factors.

Welded steel pipe is a kind of steel pipe which is formed by extrusion or rolling of steel coil or steel plate as raw material and welded along the weld.

Carbon steel is known for its strength, durability and economy and is widely used in many fields. The classification of carbon steel is usually based on its carbon content, divided into mild steel, medium carbon steel, high carbon steel, they are different in hardness, strength, processing and performance.

The heat treatment technology of seamless steel pipe is to change the internal structure of steel by controlling the process of heating, insulation and cooling to achieve the effect of enhancing its mechanical properties. Including annealing, normalizing, quenching, tempering these four heat treatment methods, through different heat treatment processes to obtain the mechanical properties of seamless steel pipes are different.

Seamless carbon steel pipes are manufactured by perforating solid carbon billets or rods, and compared with ordinary seamless steel pipes, seamless carbon steel pipes have a higher carbon content, so they are stronger and more durable. In addition, carbon steel seamless pipes have excellent tensile strength, impact resistance, and corrosion resistance.

Internal epoxy coating is a common anti-corrosion treatment, it is usually used in pipelines, water tanks and other closed occasions. It provides a layer of "protective film" for the interior of pipelines, water tanks, etc., so that it has a certain degree of corrosion resistance. The following is its processing technology, application fields and characteristics and advantages.

3PE/3PP coating pipes are mainly used in humid and corrosive environments, such as oil transmission, gas transmission, water treatment and other industrial fields. 3PE and 3PP refer to 3-Layer Polyethylene (3-Layer Polyethylene) and 3-layer Polypropylene (3-layer Polypropylene) coatings, respectively. They have excellent properties such as abrasion resistance and corrosion resistance.

Seamless steel pipes usually encounter a series of problems when purchasing, which mainly involves the material and quality of the product, whether the size is up to standard, delivery date, implementation standards, price fluctuations and other related issues. These problems are not only related to procurement costs and quality, but may even affect the use and safety of products in the later stage. Therefore, it is very important to understand the problems that will occur when purchasing seamless steel pipes.

Steel sheet pile is a kind of section steel with lock, its section has rectangle, groove and Z, etc., there are various sizes and chain forms. Its advantages are high strength, easy to penetrate into the hard soil layer, can also be constructed in deep water, and can be reused many times, so its use is very wide.

Longitudinally Submerged Arc Welded Pipe (LSAW) is a kind of SAW pipe made of steel plate hot rolled by JCOE forming technology. JCOE technology represents the forming and forming processes involved in the manufacturing process, as well as the internal and external welding and cold expansion carried out after welding.

The ASTM A500 Gr B rectangular tube is a cold-formed welded carbon steel tube designed with a rectangular cross section. Rectangular tubes are made of carbon steel, a material known for its high strength, ductility, and machinability. It is widely used in building structures, machinery manufacturing, Bridges and other fields.

A36 hot rolled flat steel is the ideal material for most processing technologies. A36 hot rolled flat steel surface is rough, the surface is bluish-gray, the edge is blunt round, the length is not accurate. A36 material is a mild steel, it has good workability, weldability and strength, suitable for construction, manufacturing and structural applications.

304 refers to an austenitic stainless steel, which is a widely used and versatile pipeline material. Defining characteristics include corrosion resistance, ease of manufacture and excellent formability. Its chemical composition includes about 18-20% chromium and 8-10.5% nickel, as well as trace amounts of manganese, silicon, carbon, and phosphorus.

TP304 stainless steel pipes are ideal for most processing technologies as well as indoor and outdoor applications. TP304 stainless steel is a high-strength material with excellent corrosion resistance and is ideal for liquid channels. ASTM A312 is the standard specification for seamless and welded stainless steel pipes.