Crane hook material

Crane hook material requires a high strength, toughness and ductility, there is no danger of sudden rupture. Single high strength material and defects usually very sensitive to cracks and higher strength, the greater the likelihood of sudden rupture. Therefore, it is widely used  gantry crane  hook material low carbon steel and low carbon steel to manufacture.

According to GB10051-88 "lifting hooks" requirement, forging hook material should be used DG20, DG20Mn, DG34CrMo, DG34CrNiMo, DG34CR2Ni2Mo steel manufacturing and other models, especially DG34CrMo, DG34CrNiMo, DG34CR2Ni2Mo alloy steel, because it contains certain content Cr, Ni , Mo element, can inhibit the austenite grain growth, making it a strong increase;bridge gantry crane during tempering, but also has three elements due to intensity decreased much, but elongation and impact toughness has enhanced many, Given containing Cr, Ni, Mo alloy elements have high strength, toughness and good, use it to create a relatively small hook size, carrying capacity is high.

In order to ensure that the manufacturing out of the hook does not occur in the life of a hard change, aging embrittlement, must ensure that the content of aluminum in the steel, to International Organization for Standardization ISO standard 0.02%.

Chip hook is generally used for large tonnage or a hot place by strong, he is usually with a thickness not less than 20mm of A3, 20 or 16Mn steel plate. Chip hook generally not a sudden rupture and damage because of breakage caused by defects confined to individual plates,hoist gantry crane and the remaining plate can still support the lifting of individual damaged plate can be replaced, and thus greater than the safety hook forging sex.