What kind of material is the chain hoist
The flaps are used for large tons of hot, burning places. It is usually made of A3, 20 # or 16Mn steel plates, which are not less than 20mm thick, without sudden breakage and high reliability. Caused by defect fracture confined to individual steel plate, the remaining steel plate can still load bearing, just change the individual steel can, so it has higher security. But the hook can only be made rectangular, so the material of the hook cannot be fully utilized.
Forging chain electric hoist crane usually use DG20, DG20Mn, DG20Mn DG34GrMo, DG34CrNiMo alloy steel and steel, the forging and stamping, after annealing and mechanical processing and become, has features of high strength and good plastic toughness.
Because of the large casting material existence quality defects, so cast steel hook shall be used for hoisting machinery, cannot adopt welding hook, also cannot use high strength and low impact toughness of steel manufacturing. Forging hook, should print the low stress area marked with rated lifting weight, factory standard, inspection marks, tag, such as dates, number and surface by forging factory inspection and load test, provide qualified certificate.
