Requirements for ring chain
(1) Under the same material and section, it should have higher bearing capacity; 

(2) have larger breaking load and elongation;

(3) have smaller deformation under the effect of bearing capacity to ensure good engagement;

(4) have higher fatigue strength; 

(5) have higher wear resistance; 

(6) have higher toughness and absorb impact load Capacity;

 (7) the geometric dimension shall meet the drawing requirements.
matters needing attention:
1. This kind of fracture mostly occurs in the defective parts of the shoulder or straight arm of the chain link, such as the crack welding heat affected zone and the crack of individual bar
2. Before the chain reaches the breaking load, it will produce the fracture caused by fatigue, which mostly occurs at the joint of straight arm and circular arc of the chain link