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一、吊钩的安全要求吊钩应具有足够的强度和刚度，因此对吊钩的材料和加工都有严格的要求，不许使用铸造的吊钩，不许用冲击韧性低的材料制作。吊钩分为锻造吊钩和叠片式铆接板钩。锻造吊钩通常用塑性好且不易产生时效应变脆性的20号优质低碳钢整体锻造而成，然后经退火处理；?
First, the hook safety requirements Hook should have sufficient strength and stiffness, so the hook material and processing have strict requirements, not allowed to use casting hook, not allowed to use low impact toughness of the material. Hook divided into forging hooks and laminated riveting plate hook. Forging hooks are usually forged from 20 high quality mild steel with good plasticity and low resistance to aging strain brittleness and then annealed.