We made all lifting chains with high-strength alloy steel 20Mn2 or 8620. The chain made by 20Mn2 have the same dimension, strength, and elongation as 8620 material, the only difference is that the chains made of 8620 material have better fatigue resistance. If you need to use the lifting chains for high-frequency operation under harsh working conditions, it's better to choose chains made of 8620 materials.