Grade 80 high -strength manganese steel has a heavy chain, and each square millimeter bears the tension of 80 cows. This is a level 80 chain in the broad sense. In fact, it is also a chain of level 80, and the difference is relatively large. First of all, from raw materials, the differences between raw materials can reach hundreds or even thousands of tons. Secondly, in terms of errors, an example is also a 10mm chain. It can be 10mm in full or 9.8mm. In terms of workmanship, you can correct 7 circles or correct meters. The efficiency is very different. In addition, the test test can not be allowed to be let go, or you can do this process, and so on. Therefore, when choosing a 80 -level chain, you must also choose a truly rigorous factory. Such a chain quality can be used with confidence.