RATIONALE FOR CONTROLLED COOLING PARAMETERS HIGH CARBON ROLLED STEEL IN WIRE MILL STREAM 320/150 JSC «MSW»
DOI:
https://doi.org/10.20535/2305-9001.2016.77.73756Keywords:
rolled steel, controlled cooling, high-carbon steel, microstructure, mechanical propertiesAbstract
Purpose. Justification and development of temperature and speed regulation during continuous cooling rolled steel of various diameters on Stelmor line. Methodology. In the production of rolled steel metal temperature control performed using stationary instrumentation and portable laser pyrometers. Metallographic examination was performed by means of optical light microscopes «OLYMPUS IX70» and «Axiovert 200 M MAT». The phase composition of the resulting scale on the rolling surface was determined by X-ray diffractometer DRON-3M. Results. A method for the controlled two-stage air-cooled rolled steel of high-carbon steels was designed, which allows for the formation of an effective metal microstructure with high quality performance. Scientific novelty. It is found that the air cooling rolled steel in the temperature range (95010)…(560…540) ºС must be carried out at a rate V1 = (7,125,5)(F:P), then V2 = (1,56,0)(F:P), which promotes the formation of pearlite structure with a high degree of dispersion with a slight separation of structurally free ferrite ( 2…3 %) for the pro-eutectoid steel composition and the almost complete absence of structural-free cementite (traces cementite network) for hypereutectoid steels. Practical importance. Industrial metal release party was characterized by a decrease in the spread of mechanical properties along the length of the coil rolled steel grade C70D2: ∆в = 50…55 МПа, ∆ψ ≤ 4 %, ∆δ10 ≤ 2 %.References
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