AThe biggest difference between grades of chain is that carbon steel chain - Grade 30, 43, and 70 - is not recommended for overhead lifting, while alloy steel chain -Grade 80 and 100 - is recommended for use in sling assemblies and overhead lifting applications.
ADepend on the applications.
- Galvanizing is suitable for highly corrosion resistant applications.
- Zinc Cr3+ plating is suitable for conveyor chains in the food industry.
- Zinc Cr6+ plating is for ASTM, JIS international standard chains. In some countries, they define colors of chains for different applications.