Rolling Mill is the production unit, in which the billets produced in the steel plant is rolled to the customer required sections and sizes in the range of standards.
Rolling Mill consists of units below;
Descaling Unit (Hermetic)
Roughing Mill (Demag)
Continuous Mill (Demag)
Bar Gauge (IPL-Orbis)
Cooling Bed (Demag)
Integrated Non- Destructive Testing Devices
Walking Hearth Reheating Furnace
The billets from steel plant is reheated to the rolling temperature with the capacity of 50 t/h.
It is possible to control the temperature of the furnace in four zones, inner pressure, combustion air and waste gas temperatures, air and gas amounts by manually or computer. By these controlled parameters, the amount of the scale on the billets is low. Low scale not only reduces production costs because of the low material loss, but also prevent the possible defects caused by scale on the surface.
Scale formed during reheating on the surface of the billets is taken out by 400 bars pressure of water sprayed by 16 nozzles to the four surfaces of the billets. By the taken out of primary and secondary scales, the surface cleanness of the billets is ideal for rolling.
By scale free billet rolling, some possible surface defects and cracks caused by scale on the surface is prevented.
It is the unit with three stands three-high mill for the preforming and presizing of the billets before continuous mill. Turning and feeding of the materials to the rolls is done by the remote controlled bar turners.
Continuous Mill and Bar Gauge
Continuous mill consists of three horizontal and three vertical, totally six stands. It has been founded in 1998 with modern technology for the capability of the precision sizing production. Material flow, speed and other parameters are simulated on the screen at the same time with the production, and by this way online control is possible.
Every produced bar is 100% measured by bar gauge, after the last continuous stand. Bar gauge, according to the standards, measures the favorableness of the materials with 2000/sec frequency by the technique of two camera lightning. By this computer controlled system, produced material is under control according to the standards. Produced bar is cut to the length of 25 to 42 m. by rotary shear after bar gauge.
Addition to these systems, there are covers for the additional slow cooling and for the controlled slow cooling of the steel qualities that gets harden in air.
Shot Blasting Machines
Çemtas has two shot blasting machines. Shots are blasted on to the material and the scale on the material is taken out. Scale free surface of the products is important for the detection of the surface defects in the non destructive testing machines. Surface quality of Sa 2,5 standard is achieved.
Çemtaş has two straightening machines. The round product in the size range of 15 110 mm is straightened with the 1 mm/m precision. The material is straightened by the three point contact loading with the special designed straightening rolls. During straightening, material is turned for straightness homogeneity. The important characteristic of our machine is improving the surface quality by taking out of the scale during straightening.
Surface Defect Testing Device
Ultrasonic Inner Defect Testing Device
Çemtaş has three GE IT(KRAUTKRAMER) type ultrasonic testing devices which the models are respectively USIROB 140 SE, ROB 65 VIS and ROWA B90 PAT.
Ultrasonic testing is not only used for determining internal defects but also determining for surface and sub-surface defects too. The probes used within The ROWA device are based on new technique called Phased Array technology The ultrasonic sound waves produced by these probes, passes through a circulating water bath which surrounds the material that is going to be tested. As ultrasonic sound wave propagating through the specimen, it gives an echo from the discontunities in the material and according to the type of discontinuity the defect determined place is colored automatically
Çemtaş, has three mobile spectrometers, one of them is SPEKTROSORT and the other two are WAS made.
The mobile spectrometer is used in order to prevent mixing of the bars that are ready for shipping. The device is calibrated for the quality of the material that is going to be controlled and the every single bar in the bundles are controlled % 100.
The available heat treatments in Çemtaş are softening, stress relieving and cold shearibility annealing.