Datong Hydraulic

  4130 steel , otherwise known as chromium molybdenum steel alloy, is made with 0.8 to 1.1% chromium and 0.15 to 0.25% molybdenum as strengthening agents.Its steel properties make it a versatile metal, especially mechanical properties such as high ductility, good weld-ability, and machi-nability. Equivalent standards of 4130 steel include ASTM A1031 Grade 4130, DIN 1.7214,   25CrMo4 , BS 25CrMo4, EN 1.7214, and UNS G41300. APPLICATIONS OF CHROMOLY (4130 STEEL) 4130 steel rods and tubes are very popular with high strength and great weldability. That's why they are widely used for: Military aircraft Cylinder Shafts Automotive Machine tools Hydraulics barrels 4130 STEEL PROPERTIES Here are the values for some of the main properties of Chromoly: Density – 7.85 g/cm 3 Hardness – 217 (Brinell scale) – 95 (Rockwell B) Ultimate Tensile Strength – 540 MPa Yield Tensile Strength – 460 MPa Modulus of Elasticity – 205 GPa Machinability – 72% (in annealed state) HEAT TREATMENT OF 4130 STEEL The

 Stress released is a technique method usually for cold drawn seamless tube and honed cylinder barrel production process. With focus on the Hydraulic Cylinder Industry the following components are made by a Cold Drawing process: Cylinder Tube Cylinder Piston Rods When a 75,000 PSI minimum yield strength is specified for the design of parts in hydraulic and pneumatic cylinder there are several options for the material that will meet this regular specification. a) Cold Drawn Cylinder Tubes – both welded or seamless Grades : E355 , AISI-1020 or AISI-1026 b) Cold Drawn Round Bars used for producing Piston Rods Grades : 1045 to ASTM-A311 or 38MnVS6 For both products is strongly recommend after the Cold Drawing a further annealing process by stress relieving.  The temperature and the time of permanence in the furnace depends on the steel grade of the product and also the cooling temperature and the time is extremely important to achieve the expected result. Cold Drawing Tubes and Bars indu

  Quenching and tempering is a heat treatment process used to improve the mechanical properties of cylinder piston rod . The process involves heating the material to a high temperature, then cooling it rapidly (quenching), followed by reheating it to a lower temperature (tempering). This combination of heating, cooling, and reheating produces significant changes in the microstructure and properties of the material.  Quenching is the process of rapidly cooling a hot rolled steel bar to lock the atoms in place, creating a very hard but brittle microstructure. This is typically done by plunging the hot metal into a cooling bath, such as oil or water. The rapid cooling rate prevents the atoms from rearranging into a more stable, lower-energy state, which results in a high density of defects in the crystal lattice. These defects increase the hardness of the cylinder rod , but also make it more susceptible to cracking. Tempering is the process of reheating the quenched hydraulic steel ro