①　First of all,we need to know how to definite qualified G80 chain. The G80 chain crucial elements is the “extremely stability”, which is inseparable with safety when using.

②　G80 chain material is 20Mn2,

One: but material 20Mn2 from different steel material supplier,the cost will be different. The element content of 20Mn2 will influence the performance of chain.so manufacture of chain manufacture need to choose the correct 20Mn2 to control quality of source, Which influence the stability of chain- cost 10% difference different supplier.

Two: strictly quality control system when manufacture process ,which influence the stability of chain.

“stability of G 80 chain”- we cut down 10 pieces of G80 chains 7 links, and do breaking load test. The good chain with strictly quality control will be 10 pieces 100% qualified, but the chain without quality control,maybe will be 5 pieces can pass the breaking load test,the qualified just 50%.  

we call the 100% qualified chain is extremely stability. And the chain 50% qualified a huge safety hazard when using.

③　G80 chain: we need to take into consideration of two aspect: Elongation and Hardness. EN818-7 is for chain block and lever block,which need G80 chain more hardness,and low elongation,in order to increase the wear-resisting when chain block working. And EN818-2 for chain slings,which need more elongation,low hardness.

 Regular manufacturer will consider more quality control.safety is always first.

Expensive one: G80 chain is qualified with strictly manufacture process.more stability and safe.we choose reliable 20Mn2 material.

Cheap one: Their G80 chain is not qualified,they leave out many necessary quality control process. And they choose cheap 20Mn2 material. And sometimes if buyers give very low price of chain block, they will use Q235, or Use 20Mn2 do not do heat treatment.

This G80 chain of lever block will be cost different : 10-20%.