Views:0 Author:Site Editor Publish Time: 2021-03-18 Origin:Site
Although many people may not understand what seamless steel pipe is, it is widely used in life, especially for industrial purposes. What are the uses of seamless steel pipes? What are the quality requirements in the production of sseamless stainless steel pipe?
What is a seamless steel pipe?
Use of seamless steel pipe
Quality requirements in the production of seamless stainless steel pipe
The seamless steel pipe is made of a single piece of metal with no joints on its surface, and is called a seamless steel pipe. According to the production method, seamless pipes are divided into hot-rolled pipes, cold-rolled pipes, cold drwan stainless steel pipes, extruded pipes, pipe jacks, etc. According to the shape of the cross section, seamless steel pipes are divided into two types: round and special shapes. The formed tube has a variety of complex shapes, such as square, oval, triangle, hexagon, melon, star, and winged tubes. The maximum diameter is 650mm and the minimum diameter is 0.3mm. Depending on the application, there are thick-walled tubes and thin-walled tubes. seamless steel pipes are mainly used for petroleum geological drilling pipes, petrochemical cracking pipes, boiler pipes, bearing pipes and high-precision structural steel pipes for automobiles, tractors and aviation.
Seamless steel pipes have a hollow section and are used in large quantities as pipelines for conveying fluids, such as pipelines for conveying oil, natural gas, natural gas, water and certain solid materials. Compared with solid steel such as round steel, a steel pipe with the same bending and torsion strength is lighter and is an economical steel. Seamless steel pipes are widely used in the manufacture of structural parts and mechanical parts, such as oil drill pipes, automobile drive shafts, bicycle frames and steel scaffolding for construction (such as steel scaffolding) to manufacture ring parts, improve material utilization, and simplify manufacturing processes. To save cost materials and processing time during working, steel pipes have been widely used in manufacturing.
1. In order to improve the uniformity of the chemical composition and the purity of the steel, reduce the non-metallic inclusions and improve the distribution of the pipes, furnace refining equipment is often used for refining molten steel, and even electroslag furnaces are used for remelting refining on the pipes.
2. The geometric dimensions of seamless steel pipes mainly include the outer diameter, wall thickness, ellipticity, length, curvature of the pipe, the cutting angle of the pipe end, and the angle of the groove opposite to the cross section of the blunt edge.
3. The standard specifies the "smooth surface" requirements for seamless steel pipes. Common defects include: cracks, hairline, internal folds, external folds, rolling, internal straightness, external straightness, stratification, scars, pits, convex hulls, pits (pitted surface), scratches (scratches), internal Spiral, outer spiral, green line, concave, rolling, etc. Among them, there are dangerous defects such as broken, broken, broken, rolling, delamination, scar, pit, convex hull, etc.; steel plum, green line, scratch, slightly straight inside and outside, slightly spiral inside and outside, concave, and rolling are general defects.
4. Normally, the mechanical properties at room temperature and the mechanical properties at a certain temperature (thermal and low temperature properties) and corrosion resistance (such as oxidation, acid resistance, acid resistance, etc.) depend on the chemical composition of the steel and the structural properties of the steel And purity and heat treatment of steel. In some cases, the rolling temperature and deformation of the steel tube will also affect the performance of the seamless steel pipe.