High-intensity ring chain always wanted to understand the international standards of the chain of production, then the next we take a look at the different standards in different requirements for the chain of bars. (1) international standard specifications ISO610-1990 chain lifting chain small size, 30mm or larger size of the chain is not included in the standard. These large-sized chain of production has been widely used in the international arena and their production and acceptance is based on the German DIN22252-2001 standards. Lifting chains (2) provides for international standards ISO610-1990 D grade chain (minimum breaking stress IO00MPa) lifting chain, Germany DIN22252-2001 standard no. (3) German standard DIN22252-2o01 for steel chains have specific provisions on the chain of plastic toughness Is0610-1990 index requirements above international standards. A variety of international standards for the chain, there are many different requirements, we will talk later described. Chen chain force more stringent testing process, divided into hardness testing and tensile testing. Hardness testing mainly after heat treatment, a sample of the chain, the hardness detected by the hardness tester, hardness herein refers to a Rockwell hardness. The hardness of the link arm section is 36-40 degrees, R Department (arc position) hardness of 40-46 degrees, if the hardness is substandard 100 lifting chain, you need to adjust the heat treatment process immediately. If the hardness is qualified, it needs to be tensile testing. Rally test is destructive pull test that is the chain pull off with Rally facie breaking force and elongation values, the chain length of the test is 5 or 7 ring ring ring, taken with different specifications are not the same. If the failure is immediately process adjustment. Chain at the factory, but also the need for a whole work to pull all the testing that is 80 lifting chains, workers pulling force of 2.5 times the rated load, so the maximum to ensure the overall quality of the chain. Qualified products are subjected to a surface treatment for black and galvanized chain, after the surface treatment is completed, but also the need for random testing. All testing qualified, then allow the factory, the unqualified re-sampled. _ Hebei galvanized lifting chain lifting chain (Online) _ lifting chain sling from Hebei chen Manufacturing Limited. Hebei chen sling Manufacturing Co., Ltd. (www.qzhon.com) Hebei Baoding, forestry machinery leaders, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Chen led force in a sling with the staff warmly welcome all inquiries negotiations to create chen sling a better future.