Seamless Steel Pipe

 Most carbon steel seamless pipes are made of low-alloy high-strength structural steel made of 16Mn. This kind of steel has poor corrosion resistance. If it is not properly stored, it is likely to rust. So how should the seamless steel pipe be anticorrosive and rust removal? 1. Clean directly. If it is dust, oil and other substances, organic solvents can be used to clean the surface of the seamless steel pipe. But this can only be used as an aid to other rust removal methods, and cannot directly remove rust, scale and other substances on the steel surface. 2. Pickling with chemical agents. Cleaning with chemicals can effectively remove the rust on the seamless steel pipe and ensure a certain cleanliness on the surface, but it will cause serious environmental pollution. 3. Polishing and grinding. If there is a large area of rust, the seamless pipe manufacturer can use professional tools to remove the rust, and use mechanized equipment to precisely polish the rust position. In additi...

The selection of equipment for the steel pipe heat treatment production line should be based on the product outline, that is to say, the appropriate equipment should be selected according to the type of steel pipe (seamless pipe or welded pipe), specification, output, etc. 1. The quenching furnace is also called a high-temperature furnace. It is used to heat the steel pipe to achieve austenitization. The choice of furnace type and technical parameters should be compatible with the product outline. The main content of the product outline is output, variety, specification, etc. The heat treatment production line is generally based on the walking furnace type, and other furnace types, such as roller hearth furnaces and induction heating furnaces, can also be used. 2. The cooling device mainly refers to the quenching equipment. The steel pipe is a hollow cylindrical product with a length of several meters to more than ten meters. During the quenching process, how to control the deformation...

Project location：SPAIN Product：SEAMLESS STEEL PIPE Standard and material：EN10216-2:P265GH-TC1 Specifications：219MM-273MM Usage：pressure pipeline Inquiry time： JUNE of 2022 Order time：JULY of 2022 Shipping time：Aug of 2022 Estimated arrival time：OCT of 2022 This Purchasing order is pressure seamless pipe according to EN10216-2 standard. This is the third purchasing order for this Europe client for the EN standard seamless pipes. As we always understand, EUROPE client got high requirement , and the technical points for this purchasing order included: MTR 3.2Tüv-EN10204 from finish-product/smls pipes EN10216-2:P265GH-TC1, last Edition Charpy-V-notch impact test at 0°C, >/=27J (average of three specimens), >/= 27J (individual value) acc. to ISO148-1:2010 & ASTM E23. Allowed length-tolerance: -0/+50mm UT acc. to EN10893-10, U2 NDT acc. to EN10216-2 and the here specified materialgrade e.g. ET- and UT-test MARKING proposal:(Pipe-manufacturer´s name) Smls pipe – EN10216-2 – P265GH –...

 The difference between carbon steel seamless tube and stainless steel seamless tube mainly refers to the difference in design rules between carbon steel and stainless steel, which means that the design rules of these two types of steel cannot be used in common. These differences are summarized as follows: Carbon steel 1. Ordinary steel is carbon steel, that is, iron-carbon alloy. According to the level of carbon content, it is divided into low-carbon steel seamless pipes (to be called wrought iron), medium-carbon steel seamless tubes and cast iron. Generally, those with a carbon content of less than 0.2% are called low-carbon steel seamless tubes (mild seamless tube), commonly known as wrought iron or pure iron; those with a content of 0.2-1.7% are called steel; those with a content of more than 1.7% are called pig iron. 2. It is usually used on metal parts that require strength, hardness and wear resistance, such as cutting tools, steel cables, piano wires, springs and knives, et...

    For stainless steel seamless pipes, the three elements of solution treatment are temperature, holding time and cooling rate. What is the effect of solution treatment of stainless steel seamless pipe ?     1. Make the structure and composition of stainless steel seamless pipe uniform, which is especially important for raw materials, because the rolling temperature and cooling speed of each section of hot-rolled pipe are different, resulting in inconsistent structure. At high temperatures, atomic activity intensifies, the σ phase dissolves, the chemical composition tends to be uniform, and a uniform single-phase structure is obtained after rapid cooling.     2. Eliminate work hardening to facilitate continued cold processing. Through the solution treatment, the twisted crystal lattice is restored, the elongated and broken grains are recrystallized, the internal stress is eliminated, the tensile strength of the steel wire is reduced, and the elongation...

　　Hot-rolled seamless pipe is relative to cold-rolled seamless pipe. Cold-rolled seamless pipe is rolled below the recrystallization temperature, and hot-rolled seamless pipe is rolled above the recrystallization temperature. 　　Advantages: It can destroy the casting structure of the steel ingot, refine the grains of the steel, and eliminate the defects of the microstructure, thereby making the steel structure dense and improving the mechanical properties. This improvement is mainly reflected in the rolling direction, so that the steel is no longer an isotropic body to a certain extent. Bubbles, cracks and looseness formed during casting can also be welded under high temperature and pressure. 　　Disadvantages: 　　1. After hot rolling, non-metallic inclusions (mainly sulfides and oxides, as well as silicates) inside the steel are pressed into flakes, and delamination (interlayer) occurs. Delamination greatly deteriorates the tensile properties of the steel in the thickness d...

　　The seamless steel pipe is expressed by the method of outer diameter, wall thickness and thick-walled seamless pipe, which are mainly used for mechanical processing, coal mine, hydraulic steel and the like. The material of the thick-walled seamless steel pipe is divided into 10#, 20#, 35#, 45#, 20Cr, 40Cr, 42CrMo, 16Mn, 27SiMn, 12Cr1MoV, 10CrMo910, 15CrMo, 35CrMo and the like. 　　1. The seamless pipe must be worn with labor protection products before pickling. For the working environment on site, detailed inspection is also carried out, mainly to check whether the sling of the steel pipe is in good condition, and the work can be carried out after the confirmation is completed. 　　2. When the seamless tube is pickled, the pickling is mainly acid washing with hydrochloric acid, and the content of hydrochloric acid is generally 18% to 20%. 　　3. The staff also needs to know the acid concentration and temperature and the tonnage of the acid pickling pipe before the operation. 　　4. F...

　　Generally, stainless steel seamless pipes are subjected to a pickling passivation process. In order to make the surface texture better and the appearance is more clean and beautiful, there is a key step in the pickling passivation process, which is also very error-prone, that is, chemical degreasing. Steps, once the operation is wrong, the surface of the seamless pipe will not be completely degreased, which will not only affect the appearance but also affect the texture. Therefore, we will focus on the precautions for chemical degreasing: 　　1. Chemical degreasing adopts the foaming method in the tank, the oil removal tank is made of steel plate, and the inner wall is covered with PVC or polyethylene. 　　2. Stop the chemical degreasing treatment with 12~15% nitric acid (by volume). The temperature is 40 °C~60 °C, and the time is 2~4 hours. 　　3. When the stainless steel seamless tube is immersed in the tank, pay attention to the position where it is placed, and leave air in the tu...

　　The packaging requirements for seamless steel tubes are basically divided into two categories: one is a common type of bundling, and the other is a similar container loading with a turnover box. 　 　1. Seamless pipe bundling 　　a. The steel pipe should be avoided during the bundling and transportation process, and the bundling signs should be uniform. 　　b. The same bundle of steel pipes shall be the same steel number (batch number), steel grade and steel pipe of the same specification. It shall not be bundled in the mixing furnace (batch number). If there is less than one bundle, it shall be bundled into small bundles. 　　c. The weight of each bundle of steel pipes should not exceed 50kg. The weight of the bundle can be increased with the consent of the user, but the maximum weight cannot exceed 80 kg. 　　d. For flat-end steel pipe bundles, one end should be aligned, the pipe ends of the aligned ends should be less than 20mm, and the length difference of each bundle of steel pi...

　　 Seamless pipe mechanical properties failed mainly in its low elongation and yield point is not obvious, the mechanical properties of the above-mentioned non-conforming product samples for metallurgical testing, found cold drawn pipe spherical pearlite organization and very fine grains ferrite. 　　Globular pearlite structure is a typical annealing inadequate organization. Normal cold drawing process requirements, the microstructure after annealing should be ferrite and pearlite flaky globular pearlite formation temperature is 750 ~ 830 °C, so the globular pearlite, suggesting that the low annealing temperature, annealing insufficient. 　　Extremely fine grains of ferrite is also an annealing inadequate organization, and its globular pearlite formation conditions are different. Globular pearlite is formed when the annealing temperature is low, and the very fine ferrite grain structure is appropriate at the annealing temperature and time is short form. 　　After the cold-drawn steel ...