Posted 28 Dec 2010 22:59
Cord steel wire rod for cold drawing steel cord production of raw materials, high value-added products, technical indicators are also high on the surface of the skin have a higher iron requirements. The actual production of cord steel wire rod surface oxide scale mainly There are two problems: 1) the phenomenon of oxide scale thickness exceeded the standard, non-uniform thickness control; 2) cord steel wire rod of iron oxide skin easy to clean, prone to pulling accidents. The main process of rolling mill from the following aspects of the control surface oxide scale .1) pass fullness: rolling in rolling in the hole, rolled left to pass on both sides is full of headroom, so that not with the hole on both sides of rolling contact, to prevent the full pass through. filled with a great degree of benefit on both sides of iron oxide skin rolling off, pass the descaling effect .2) pass deformation: by changing the crude each pass of the rolling reduction ratio, increase the cumulative deformation before finishing can improve the skin peeling of secondary iron oxide .3) between the tension of racks: live rough rolling, rolling finishing mill tension micro, rack increase the tension between, you can increase the rolling plastic elongation, the combination of rolling and loose oxide layer to improve the pass rolling rolling effect of the surface oxide peeling skin .4) rolling temperature: the temperature control on rolling, and finally rolling temperature, can control the rolling surface of oxide scale thickness and structural characteristics, so that with the rolling base peeling. 1) protective coating to prevent oxidation of steel billets have a demonstrable effect, protect the paint coated specimen weight per unit area of oxide scale is about average reduction of 10.86%, while different heating systems will also affect the antioxidant protective coating, in which the billet fast its obvious influence on the heating, the skin may significantly reduce the production of iron oxide. 2) The degree of control through the hole is full, you can make the process of rolling deformation of the surface oxide scale easy to fall off; through the rack between the tension control, make rolling loose combination with the surface oxide layer, thus improving rolling effect of the surface oxide peeling skin ; through the rolling temperature control, can control the rolling surface oxide thickness and structural properties of the skin, so peeling and rolling. 3) using the finite element method rolling temperature field, determine the wire cooling process, reducing the oxide thickness, and reduce the FeO ?Fe3O4 + Fe changes in the amount of wire to obtain the ideal structure of the surface oxide layer. 4) process improvement, cord steel wire rod surface oxide layer of about 52% of the average thickness is reduced. The field sampling and testing, the present cord steel wire rod surface oxide thickness is about steady at 6.0 m, maximum thickness ?10.0 m.