Effect of Strip Velocity on Pickling Rate of Hot-Rolled Steel in Hydrochloric Acid
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The combined effect of strip velocity with other parameters on pickling rate of hot-rolled low-carbon steel in hydrochloric acid (HCl) solutions was determined. At temperatures from 150 to200°F(66 to 93°), the time required for pickling decreased substantially as strip velocity was increased from 0 to about 250 fpm (76 mpm); no further decrease in time resulted when velocities were increased to 800 fpm (244 mpm). Other pickling variables were studied with a velocity of 400 fpm (122 mpm). Pickling times decrease with increases in HCl concentrations, CHCl, and temperature, TF, according to prediction equations of the form log t = A + B log CHCl + D(459 + TF)−1. At 200°F, temper-mill scalebreaking decreased pickling times by about 5 sec; at lower temperatures, a larger magnitude effect was noted for one steel in the group tested.
KeywordsSpecimen Holder Scale Removal Large Magnitude Effect Descale Time Strip Speed
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