Chain in the workpiece by twisting and bending alternating load, impact load acting under its surface will be subjected to greater stress than the central portion, if in the case of friction, the surface layer will continue to be worn, lifting chain where quality OK, so in order to improve the strength of the surface layer, hardness, wear resistance and high fatigue limit and other requirements, Baoding lifting chain, it must be strengthened in order to meet the above requirements surface. Currently in production is extremely wide application surface hardening, because the surface has a small deformation hardening, high productivity advantages. Hardened steel is heated to above Ac3 or Ac1, high strength lifting chain, after incubation in order to obtain an unstable organization, using water or oil coolant rapid cooling. Depending on the heating mode, the chain can be divided into induction heating surface hardening surface hardening, surface hardening flame heating and electrical contact with the heating surface hardening. Chen lifting chain of the company after two quenching temperature of about 800 degrees -1000 degrees. The chain has high strength hardness, black lifting chain, for lifting industry. Chen force to ensure that the chain of relevant dimensions of accuracy and tension on the chain by using two correction and a working drawing, the maximum guarantee the overall quality of the chain. The first major correction is a correction size and type. Chain type styles: Style monocyclic typing: T8- specifications C; T8- specifications; G80; C G80; T8BB and other styles. I am currently typing is T8- General Specifications C and G80. You can also type in accordance with customer demand for the second correction is corrected chain tension and dimensions. Secondary Calibration aims to ensure the accuracy of the test chain pull and chain size, the test load two schools was 2.5 times the rated load. Such as 8mm chain of rated load is 2 tons, the test load is 2.5 × 2 = 5 tons. Two correction process if there is a chain off phenomenon, need to take the ring, welding. This process requires a single ring dipped in fire. Monocyclic dip fire temperature of 1000 degrees. Rally detect single ring is cocking employment testing, 2.5 times the rated load of the tension value chain. Lifting chain where good quality | Baoding lifting chain | chen chen sling sling from Hebei Manufacturing Limited. Hebei chen sling Manufacturing Co., Ltd. (www.qzhon.com) strong, credible, in Baoding forestry machinery industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead chen sling into the brilliant and you work for a better future!