Wire and Rod Drawing Process for Steel Nov13

Wire and Rod Drawing Process for Steel...

Wire and Rod Drawing Process for Steel Drawing of wire from steel rod is a metal working process used for the reduction of the cross-section of the rod. Similarly rods are drawn from steel rounds of larger diameters. During drawing the volume remains the same and hence there is increased in the length of the drawn wire or rod. It is carried out by pulling the wire/rod through a single or a series of the drawing dies. In the case of series of drawing dies, the subsequent drawing die is to have smaller bore diameter than the previous drawing die. Drawing is usually performed in round sections at room temperature, thus it is classified as a cold working process. However, it can be performed at higher temperatures for large wires to reduce forces. Drawing process normally is most frequently used to produce round cross sections, but squares and other shapes can also be drawn. Wire/rod drawing is an important industrial process, providing commercial products. Rod and wire products cover a very wide range of applications which include shafts for power transmission, machine and structural components, blanks for bolts and rivets, electrical wiring, cables, wire stock for fences, rod stock to produce nails, screws, rivets, springs and many others. Drawing of rods from steel rounds is used to produce rods for machining, forging, and other processes etc. Advantages of drawing in the above applications include (i) close dimensional control, (ii) good surface finish, (iii) improved mechanical properties such as strength and hardness, and (iv) adaptability to economical batch or mass production. In the process of drawing, the cross section of a long rod or wire is reduced or changed by pulling (hence the term drawing) it through a die called a draw die. Pulling of rod...

Steel Wire Rods

Steel Wire Rods Steel wire rod is a semi-finished product which is rolled from steel billet in a wire rod mill and is used primarily for the manufacture of wire. For a steel plant it is a finished product. The steel for wire rod is produced by all the modern steelmaking processes, including the basic oxygen and electric furnace processes. Steel wire rod is usually cold drawn into wire suitable for further processing such as cold rolling, cold heading, cold upsetting, cold extrusion, cold forging, or hot forging. Although wire rod may be produced in several regular shapes (round, square, hexagonal, and rectangular), most of the wire rods rolled are round in cross section. Round wire rod is usually produced in nominal diameters of 5 mm to 15 mm, advancing in increments of 0.5 mm.  ISO 16124:2004 gives diameters of round steel wire rods ranging from 5 mm to 50 mm, advancing in increments of 0.5 mm up to 20 mm and thereafter in the increments of 1 mm. As the wire rod comes out of the rolling mill, it is formed into coils. The coils are secured either tying with a wire or strapped with a strapping band. In each coil, wire rod is continuous without any break.  Internal diameter of a wire rod coil usually varies in the range of 810 mm to 910 mm depending on the mill equipment. The external diameter of the wire rod coil depends on its weight and usually it is in the range of 1100 mm to 1300 mm. The coil weight can vary from mill to mill and normally it is in the range of 600 kg to 2.5 tons. Coil weights that exceed the capabilities of the rolling mill sometimes can be obtained by welding...