Cold drawing steel is at ambient conditions, to surpass the original steel yield strength tensile stress of tensile steel, forcibly, result in steel plastic deformation to enhance the yield strength and the purpose of saving steel. Here at room temperature for the average outdoor temperature more than 5 DEG c.
Cold drawn steel reinforced, simultaneously tensioning and extruded and deformed plastically, pull out the steel area decrease, produce cold hardening, tensile strength can be increased by 40 - 90%. Cold drawing and cold drawn metal cold processing by two different methods, the two are not a concept. Cold drawn refers to the metal material at both ends of a tensile force is applied, so as to cause the material tensile deformation method.
Drawing refers to the material is applied pulling force, so that the material through a die hole and pull out method, mold aperture diameter smaller than material. Cold drawing processing materials in addition to tensile deformation and extrusion, drawing processing in general to the special drawing machine for. Through cold drawing materials than the processing of cold-drawn material properties.
Cold-drawing steel reinforced by strong pull off is smaller in diameter than its hard alloy wire drawing die, which is reinforced by longitudinal force and lateral pressure, section becomes smaller, the length of variable length, steel strength greatly enhanced, but the plastic to reduce many. Cold drawn steel can improve the tensile strength, and drawing can not only improve its tensile strength, but also can improve the compressive strength.
These two kinds of cold working steel is at the expense of deformation capacity for the price, can increase the strength and hardness of the effect, but the processed steel bend strong ratio increasing, safety stock reduced ductility, failure, there is no significant deformation. In may under dynamic load position or the main part is the prohibition of the use of this kind of steel.