Datong Hydraulic

  42CrMo4 round bar   is a heat treatable steel which contains at least 0.9%Cr,0.15%Mo as strengthening elements.After quenched and tempered, It obtains high strength, good low-temperature impact toughness with a typical tensile strength of 900 -1200 N/mm2. 42CrMo4 steel has better performance than 34CrMo4 steel due to the higher carbon and chromium content. Similar to  AISI 4140 ,only a little difference in Mn,Cr content.This material also has good machinability,good wear-resistance,but the temper brittleness is not obvious,and poor in weldability. CHEMICAL COMPOSITION OF 42CRMO4 ROUND BAR Grade C Si Mn Cr Mo P S 42CrMo4/1.7225 0.38-0.45 ≤ 0.4 0.6-0.9 0.9-1.2 0.15-0.3 ≤ 0.025 ≤ 0.035 42CrMoS4/1.7227 0.38-0.45 ≤ 0.4 0.6-0.9 0.9-1.2 0.15-0.3 ≤ 0.025 0.02-0.04 RELEVANT STANDARDS OF 42CRMO4 STEEL BAR USA UK China Japan France Russia 4140 EN19/708M40 42CrMo SCM440 42CD4 42HM APPLICATIONS OF  42CRMO4 ROUND BAR 42CrMo4 has high strength and wear-resistance,widely used in many industries. Com

  Quenched and tempered process usually appears in   hydraulic cylinder rod   or pneumatic  systems. It is formed by rolling. A cold hardening layer is formed on the surface of the rolling surface, which helps to reduce the elastic and plastic deformation of the contact surface of the grinding pair, improve the wear resistance of the surface of the   Datong cylinder rod , and avoid the burns caused by grinding. Next, chamfer the installation base and the rail side reference installation surface to prevent the chamfer too large or protruding; at the same time, on the base surface processing locking thread hole for installation and fixation of the device. The latter step is to check the linear guide, such as whether there is a certificate, whether there is a bruise or rust.  The reason why the  quenched and tempered piston rod  bends is analyzed and two results are obtained. On the one hand, it is possible that the accumulation of sediment at the lower end of the boom  hydraulic cylinder

  E355 seamless honed tube   is a kind of high-precision steel pipe material processed by   cold drawing   or hot rolling. Due to the advantages of no oxide layer on the inner and outer walls of the precision steel tube, no leakage under high pressure, high precision, high finish, no deformation in cold bending, no flaring, no cracks in flattening, etc. E355 honed tubes mainly used for pneumatic or hydraulic components, such as  cylinder barrels , can be seamless pipe. The chemical composition of the quilted grinding tube is carbon C, silicon Si, manganese Mn, sulfur S, phosphorus P, and chromium Cr. PROCESSING TECHNOLOGY OF E355 SEAMLESS HONED TUBES E355 honed tube is processed by rolling, because the surface layer has residual compressive stress on the surface, which helps to close the tiny cracks on the surface and hinders the expansion of erosion. Therefore, the corrosion resistance of the surface can be improved, and the generation or expansion of fatigue cracks can be delayed, th