Shanghai ShengQiu Materials Co., Ltd

ASTM A335 Grade P22 Alloy Steel Seamless Pipe   O.D.: 10MM-720MM W.T.:1MM-120MM Length: Single Random, Double Random, 6-12meters   A335/SA335 Grade P22 Alloy Steel Seamless Pipes are Carbon steel pipes with addition of chromium, molybdenum, and sometimes vanadium. Chromium, or chrome, improves high-temperature strength, increases oxidation resistance and raises the tensile, yield and hardness at room temperatures. Molybdenum increases the strength, elastic limit, resistance to wear, impact qualities and hardenability. It increases the resistance to softening, restrains grain growth and makes chromium steel less susceptible to embrittlement. Moly is also the most effective additive for increasing high temperature creep strength, or creep resistance, and it also enhances the corrosion resistance of steel and inhibits pitting. Grade P22 is used for high temperature service applications and is tolerant to variations in its microstructure.   P22 Pipe Chemical Requirements: •...

  The Main Application of Alloy Pipes Alloy pipes are mainly used to transport water, gas, natural gas, petroleum, and certain solid materials etc. Because the alloy pipe has a hollow section, it is widely used as a pipeline for conveying fluids and manufacture structural parts and mechanical parts, such as oil drill pipes, boiler pipes, automobile transmission shafts, bicycle frames, and steel scaffolding used in construction. The alloy steel pipes can be used to manufacture ring-shaped parts and increase the utilization rate of materials, simplify the manufacturing process, save materials and reduce processing time, such as rolling bearing rings, jack sleeves, etc. Compared with solid steel such as round steel, the weight of alloy steel pipe is lighter when the bending and torsion strength is the same, so alloy steel pipe is a kind of economical cross-section steel. Shanghai ShengQiu can supply alloy pipes which are used for boiler and heat exchanger. Standard and Grade:  #E...

  Generally speaking, the production process of thick-walled seamless pipe can be divided into two types: cold drawn/rolled and hot rolled. The production process of cold rolled seamless steel pipes is generally more complicated than hot rolled. First, the billet will be subjected to three-rolled continuous rolling, and then the sizing test will be carried out after extrusion. If the surface does not respond to cracks, the round pipes will be cut into one meter long. The next step is annealing process. Annealing needs to be pickled with acidic liquid. When pickling, pay more attention to whether there are a lot of bubbles on the surface. If there are a lot of bubbles, it means the quality of the steel pipe does not meet the standard. In appearance, cold rolled seamless steel pipes are shorter than hot rolled seamless steel pipes. The wall thickness of cold-rolled seamless steel pipes is generally smaller than hot-rolled seamless steel pipes, but the surface looks brighter than thic...

  The method of using acid solution to remove oxide scale and rust on the surface of steel is called pickling. Acids for pickling include sulfuric acid, hydrochloric acid, phosphoric acid, nitric acid and mixed acids. The pickling process is to remove the surface oxide scale, and then go through lubrication treatment (carbon steel-phosphorous saponification, stainless steel-butter lime, copper and aluminum pipe-oiling, using the old process-copper plating), and then deep drawing processing. If the steel pipe is not pickled, there may be oxides and oil stains on the surface, and probably the phosphating solution cannot be able to remove them and the quality of phosphating will be reduced. In addition, in the manufacturing process of steel pipes, after many processes, if you are not careful, scars will appear on the surface of the steel pipes, which will reduce the corrosion resistance of the parts and affect the service life. In order to improve the corrosion resistance of the steel...