Hooks need to be made of I steel, and shall not be cold processing, what does it mean?
First of all, the hook generally bear dynamic load, therefore need to be reinforced with enough flexibility, secondly, hook to omen in the overload after fracture, which is deformed or stretched out, a reinforced good ductility is flexible, it is soft, but obvious omen before fracture, steel cold working can improve the tensile the strength, but the ductility is bad, the elongation decreased under dynamic load capacity is reduced, processing steel needs to be heated, because the steel will produce internal force in the internal of the cold deformation, cause the added strength which is reinforced in cold processing, steel after heating, internal atoms move easily so, do not produce force, the mechanical properties will not change, but don't overdo or quench, naturally cooling slowly, or worse mechanical properties.
First of all, do you have any design drawings? If so, you understand that I do not quite agree with the heating process, as it is not directly cold bending.Does the design institute want you to buy direct, non - cold machined rings?;Or they understand the cold processing is cold drawn and cold drawn, etc., does not include our site commonly used steel bending method, so direct processing steel bar is good, as long as not cold drawn.It's best to ask the design institute to call them and ask them what they mean
What you say is on the site, used for hanging objects, called embedded rings, long for the lifting ring and lift the lifting ring, the specification requirements must be hot rolled 1 steelCold processing refers to the cold rolled steel or cold drawn steel, the tensile stress of the steel is high, the ductility is small, prone to brittle fracture, in the process, easy to form processing damage, it is not allowed to useCold rolling processing need heating? Oh oh? What do you see in that country?No, bending is required as required by the drawing
