Cold Drawn Bar is made from SBQ (special bar quality) HR bar. It is drawn through a die reducing the cross-sectional area of the bar, and giving it a smooth ‘drawn’ finish. Depending on the shape of the die, the finished product can have a round, hexagonal, square, or flat cross section. Cold drawn bars have greater size accuracy, straightness, and increased tensile and yield strength, as well as improved machinability. In addition to standard cold drawn bars, it can be supplied as turned and polished, turned ground and polished and drawn ground and polished.
1018 COLD DRAWN BAR
CD 1018 is a low carbon steel with a medium manganese content. Has good case hardening properties, fair machinability and is excellent for cold bending and forming operations
1045 COLD DRAWN BAR
CD 1045 bar is a medium carbon range steel that offers better mechanical property advantages over 1018 and other lower carbon steels. It has good heat treatment response and fair welding characteristic
12L14 COLD DRAWN BAR
12L14 –12L14 is a standard resulfurized and rephosphorized grade carbon Steel, and a free machining steel. The added lead to the chemical composition provides improved machinability
STRESSPROOF TM COLD DRAWN BAR
Typical applications are keyed shafts, racks, motor shafts, mandrels, bushings, and kingpins.
Raw Stock: Hot rolled steel bar or rod coils are used as raw material. Because the hot rolled products are produced at elevated temperatures (1700 – 2200 Deg. F. i.e. hot rolling), they generally have a rough and scaled surface and may also exhibit variations in section and size.
Cleaning: Abrasive scale (iron oxide) on the surface of the hot rolled rough stock is removed.
Coating: The surface of the bar or coil is coated with a drawing lubricant to aid cold drawing.
Pointing: Several inches of the lead ends of the bar or coil are reduced in size by swaging or extruding so that it can pass freely through the drawing die. Note: This is done because the die opening is always smaller than the original bar or coil section size.
Drawing: In this process, the material being drawn is at room temperature (i.e. Cold-Drawn). The pointed/reduced end of the bar or coil, which is smaller than the die opening, is passed through the die where it enters a gripping device of the drawing machine. The drawing machine pulls or draws the remaining unreduced section of the bar or coil through the die. The die reduces the cross section of the original bar or coil, shapes the profile of the product and increases the length of the original product.
Finished Product: The drawn product, which is referred to as Cold Drawn or Cold Finished, exhibits a bright and/or polished finish, increased mechanical properties, improved machining characteristics and precise and uniform dimensional tolerances.
Multi-Pass Drawing: The cold drawing of complex shapes/profiles may require that each bar/coil be drawn several times in order to produce the desired shape and tolerances. This process is called multi-pass drawing and involves drawing through smaller and smaller die openings. Material is generally annealed between each drawing pass to remove cold work and to increase ductility.