1. It is forged by special alloy steel with high intensity and high toughness, and then it is heat treated;
2. Each workpiece should pass testing at 2 times of working load limit
3. We should carry out strict sampling and breakage testing for each batch of products;
4. We should carry out 100% magnetic powder flaw detection
5. Surface treatment: plastics spraying
6. Color code: red RAL3020/yellow RAL1003.
7. For G80 3-leg or 4-leg chain slings.
Blue area products series: welded master link and master coupling link
Yellow area products series：forged master link and welded master coupling link
