Experimental Study Of Thin Steel Temper Rolling

Temper rolling of Q235 thin steel is studied on a Φ170×250 mm double rollermill, under different force down rates, at temperatures less than 650℃. The carboncontent of the Q235 is 0.137% and 0.219%. The influence of temperature, force down rateon the rolling press was analyzed, and the rolling press data was compared with pressequation, and the press equation was acquired unter the test condition. Tension test,hardness test were carried out on samples after the rolling. The samples were underannealing treatment after rolling, and metallographic analysis of the samples wasperformed.Friction force was analyzed through the data acquired from Q235 thin steel temperrolling, and the equation can be utilized under similar rolling conditions.Through comparison with other drought force equations, Hill equation fits the datawell, with errors less than 20%.The blue brittleness point of the Q235 thin steel is at about 450℃, and the temperrolling of Q235 thin steel should be avoid from this temperature.The deformation resistance of temper rolling is less than that of cold rolling, andthe plasticity of the thin steel increases at no blue brittleness temperature point.The draught force meets its minimum point at depress rate of 22.86%-25.46%, at250℃-450℃. The work-hardness decreases with the increase of temperature at 550℃-650℃.At the same experimental conditions, the thin steel with carbon content of 0.137%appears significant differences in rolling properties and performance qualities comparedwith the steel with carbon content of 0.219%.At 250-650℃, the relationship of stress and deformation, the relationship oftemperature and hardness, were achieved through Q235 thin steel rolling.