Changsha Xiangjia Metal Materical Co., Ltd.

Electric Resistance Welding (ERW) pipe  is manufactured by rolling metal and then welding it longitudinally across its length.  Seamless pipe  is manufactured by extruding the metal to the desired length; therefore ERW pipe have a welded joint in its cross-section, while seamless pipe does not have any joint in its cross-section through-out its length. In Seamless pipe, there are no welding or joints and is manufactured from solid round billets. The seamless pipe is finished to dimensional and wall thickness specifications in sizes from 1/8 inch to 26 inch OD. Applicable in for High-pressure applications such as Hydrocarbon Industries & Refineries, Oil & Gas Exploration & Drilling, Oil & Gas Transportation and Air and Hydraulic cylinders, Bearings, Boilers, Automobiles etc. ERW (Electric Resistance Welded) pipes are welded longitudinally, manufactured from Strip / Coil and can be manufactured upto 24” OD. ERW pipe cold formed from a ribbon of steel pulled thr

The fluid  seamless tube  has a hollow cross section, and is widely used as a pipeline for transporting fluids, such as a pipeline for transporting oil, natural gas, coal gas, water, and certain solid materials. Compared with solid steel such as round steel, steel pipe is lighter in weight when the flexural and torsional strength is the same, and is an economical cross-section steel. It is widely used in the manufacture of structural parts and mechanical parts, such as oil drill pipes, automobile transmission shafts, and bicycles Frames and steel scaffolds used in construction are used to make ring parts made of steel pipes. Seamless pipes for special purposes include seamless pipes for boilers, chemical power, seamless pipes for geology and seamless pipes for petroleum. The characteristics of seamless tubes are as follows: The excellent corrosion resistance of stainless steel seamless pipes is due to the formation of an invisible oxide film on the surface of the steel, which ma

Straight seam steel pipe  is a welded steel pipe with one longitudinal weld line on the pipe body. GB / 9711.1 specifies that the straight seam steel pipe can have two straight welds when the diameter is over 914.4, and the angle of the weld is 180 degrees. Weld quality requires the same technical parameters as straight seam steel pipe. According to the production process, it is divided into: ERW high-frequency straight seam steel pipe, JCOE straight seam steel pipe, rolled straight seam steel pipe. Straight seam steel pipe is a general term for high-frequency straight seam, submerged arc straight seam, electric welding straight seam, pipeline straight seam and other production process products. The high-frequency straight seam steel pipe use the skin effect of high-frequency current to cause high temperature at both ends of the steel plate in a short time and squeeze and fused together by external force. It is a true buttless base metal butt joint. ERW high-frequency straight

Seamless steel pipes  are widely used in our daily life brings lots help. It is rolled from ordinary carbon structural steel, low alloy structural steel or alloy structural steel, with large production. It is mainly used as a pipeline or structural part for conveying fluid. Here I will share with you the production standards of spiral steel pipes. Seamless steel pipe is made of a single piece of metal with no seams on the surface. According to the production method, the seamless steel pipe divides into hot rolled pipes, cold rolled pipes, cold drawn pipes, extruded pipes, jacking pipes, etc. According to the cross-sectional shape, the seamless steel pipe is divided into two types: round and irregular. The shaped tube has a variety of complex shapes such as square, ellipse, triangle, hexagon, melon, star, and finned tube. The large diameter is 650mm and the small diameter is 0.3mm. Depending on the application, there are thick-walled tubes and thin-walled tubes. Seamless steel p

With the development of the economy, the demand of galvanized steel pipes increasing day by day. But most of people may not know the precautions for welding  galvanized pipes . The seam must be polished before welding, otherwise will have bubbles, trachoma, false welding, etc. It will also drop the welds brittle and the rigidity.  Characteristics of welding galvanized steel Usually galvanized steel coated with zinc on the low carbon steel, and the galvanized layer is about 20um thick. The melting point of zinc is around 419 ° C and the boiling point is around 908 ° C. In welding, zinc melts into a liquid and floats on the surface of the molten pool or at the root of the weld. Zinc has greater solid solubility in iron, zinc liquid will deeply etch the weld metal along the grain boundary, and low melting point zinc forms "liquid metal embrittlement". At the same time, zinc and iron can form brittle compounds between metals, these brittle phases reduce the plasticit

1. Cleaning Use solvents and emulsions to clean the surface of  steel pipe  to remove oil, grease, dust, lubricants and similar organic matter, but it can not remove rust, scale, welding flux, etc. on the surface of steel, so it is only used as an auxiliary means in defense operations. 2. Pickling Picking are chemical and electrolytic methods. Steel pipe anti-corrosion uses chemical pickling, which can remove scale, rust, and old coatings. Sometimes it can be used as reprocessing after sandblasting and rust removal. Although chemical cleaning can make the surface reach a certain degree of cleanliness and roughness, but it is easy to cause pollution to the environment. 3. Tool derusting Using steel wire brushes and other tools to polish the steel pipe surface, which can remove loose scale, rust, welding slag and so on. The rust removal of hand tools can reach Sa2 level, and the rust removal of power tools can reach Sa3 level. If the steel surface is firmly attached with i