News

　　Hooks are crucial for the safe and reliable operation of the crane. To this end, there are strict requirements for the material and processing of the hook. Since high-strength steel is sensitive to cracks and defects, the materials used to manufacture hook groups are made of special carbon calm steel or low-carbon alloy steel, and the steel grades are DG20, DG20Mn steel and DG34CrMo and DG34CrNiMo alloy steel. The hook set made by forging and stamping, annealing and then mechanically processed has the characteristics of high strength and good plastic toughness.

　　Slice hooks are generally used in places where large tonnage is burned by strong scorching objects. Usually, sheet hooks are made of A3, No. 20 or 16Mn steel plates with a thickness of not less than 20 ram, and there will be no sudden breakage and high reliability. Since the fracture caused by defects is limited to individual steel plates, the remaining steel plates can still support the lifting weight. Just replace individual steel plates. The hook plates cannot break at the same time, so it has great safety. However, the sheet hook can only be made into a rectangular cross-section, so the strength performance of the hook body material cannot be fully utilized.

　　Because casting materials have many quality defects, such as defects such as shrinkage, shrinkage, thermal stress, slag inclusion, etc., it is easy to generate cracks and is not easy to be discovered, so lifting machinery must not use cast steel hooks; welded hook groups cannot be used because welding defects such as pores, slag inclusion, infiltration, cracks, etc.; hooks cannot be made from steel with high strength and low impact toughness.

　　Hooks are crucial for the safe and reliable operation of the crane. To this end, there are strict requirements for the material and processing of the hook. Since high-strength steel is sensitive to cracks and defects, the materials used to manufacture hook groups are made of special carbon calm steel or low-carbon alloy steel, and the steel grades are DG20, DG20Mn steel and DG34CrMo and DG34CrNiMo alloy steel. The hook set made by forging and stamping, annealing and then mechanically processed has the characteristics of high strength and good plastic toughness.

　　Slice hooks are generally used in places where large tonnage is burned by strong scorching objects. Usually, sheet hooks are made of A3, No. 20 or 16Mn steel plates with a thickness of not less than 20 ram, and there will be no sudden breakage and high reliability. Since the fracture caused by defects is limited to individual steel plates, the remaining steel plates can still support the lifting weight. Just replace individual steel plates. The hook plates cannot break at the same time, so it has great safety. However, the sheet hook can only be made into a rectangular cross-section, so the strength performance of the hook body material cannot be fully utilized.

　　Because casting materials have many quality defects, such as defects such as shrinkage, shrinkage, thermal stress, slag inclusion, etc., it is easy to generate cracks and is not easy to be discovered, so lifting machinery must not use cast steel hooks; welded hook groups cannot be used because welding defects such as pores, slag inclusion, infiltration, cracks, etc.; hooks cannot be made from steel with high strength and low impact toughness.