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...

Rolling mill Rolls and Roll Shop Dec10

Rolling mill Rolls and Roll Shop...

Rolling mill Rolls and Roll Shop Rolls are the main and very costly consumables in a rolling mill. They are used to roll steel in the rolling mill and their performance depend on many factors which include the materials used and the loads to which they are subjected to during service. The roll design is influenced by the limitations applied by the rolling load, the roll strength and the torque available for rolling. In case of flat rolling it is also influenced by the allowance made for roll bending and by cambering of the rolls. The roll design is to take-care the load and torque required for any pass. In addition it must ensure that the physical dimensions and material of the roll are capable of withstanding the heaviest loads arising during the rolling sequence. Another important factor where roll life is concerned is the wear properties of the roll material. Roll materials In the rolling of steels, the material of the rolls is to be capable of withstanding loads which plastically deforms the rolling stock without itself being plastically deformed. In the rolling of hot steel this is not a difficult problem and iron or steel rolls are suitable if they are operated at a temperature considerably lower than that of the rolling stock. Whether iron or steel rolls are used in any particular case depends on the specific duty they have to perform and whether toughness, resistance to thermal cracking or shock loading or hard wearing properties is most important. Rolls can be classified according to the roll materials (Fig 1) and the method of manufacture, the first main subdivision being (i) iron rolls, and (ii) steel rolls. This division depends on the carbon content of the material. In the case of...

Wire Rods and Wire Rod Mills Aug13

Wire Rods and Wire Rod Mills...

Wire Rods and Wire Rod Mills Steel wire rods are an all-round talent since they are the key product of steel industry with multiple uses. They are used as the material for fasteners, springs, bearings, wire ropes, chains, cables, wire meshes, wire fencings, tyre cord, reinforcement in railway sleepers, and many other uses. They are used for the components needed for the automotive industry, chemical industry, power stations and machine engineering. Unlike cold-rolled sheets, heavy plates, pipes, sections and other steel products, wire rods are seldom used as hot rolled for final products, but they are manufactured into machine parts after undergoing one or more stages of so called post-processing such as heat treatment, forging and wire drawing at specialist plants. Wire rods are generally drawn down to a specific diameter before being subjected to forging or other forming operations in secondary processing. In many cases, the size of the wire rods before being subjected to these forming operations is to be less than the minimum size of 5.5 mm that can be supplied as rolled. Generally each of the wire rod product is developed with due attention to its behaviour at the post-processing stages. What is required for a steel plant regarding wire rods is good processibility and fulfilment of the required properties after the processing. Furthermore, since the costs of the post-processing is sometimes several times the price of the wire rods, it is increasingly important to reduce the total integrated manufacturing cost from the steel material to the final product. Also thermo mechanically treated (TMT) reinforcement bars of 6 mm, 8mm and 10 mm basically required for the building construction are produced in the wire rod mills. The following generally characterizes the wire rod products. Product grades are widely varied from...