Bridge crane forged hook material for 20 gauge steel
The hook material should have a certain tensile strength and a small yield ratio to be safe and reliable. The selection of the hook material should be in accordance with the relevant provisions of the national standard to select high-quality low-carbon killed steel or low-alloy steel; the hook of the board is generally applied GB/T700 -88 "16Mn steel specified in "Technical Conditions for Ordinary Carbon Structural Steel", Q235A, C3 steel, or GB/T1591-94 "Technical Conditions for Low Alloy Structural Steel".
The lifting hooks for lifting parts are generally applied to 20 steel specified in GB/T699-88 (Quality Carbon Structural Steel No. and General Technical Conditions).
In addition, some hooks are subjected to cold bending, hot forging and welding, in order to eliminate cold work stress, thermal stress and welding stress, it is necessary to carry out appropriate heat treatment, such as quenching and tempering treatment.