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1. Hardness test shall be carried out on the samples of each heat treatment furnace. Ring hardness: ± 40 Rockwell hardness (error 2 °); Hardness of wear joint: ± 52 Rockwell hardness (error 2 °).
2. Before the chain is packed, ensure that the number and variety of corresponding accessories such as pin joint, connecting joint, ring and crowbar are correct.
3. Polish for at least one and a half hours, and then place it on the workbench for tension test. If any problem occurs, repair it according to the process flow, and visually inspect whether the chain welding model is consistent.
4. After acceptance, the inspector shall issue the product certificate and finally put it into storage.