| 摘要 |
<p>A method for correcting a coiling temperature of a hot rolled steel sheet is provided to correct the coiling temperature more accurately by determining an upper limit value of heat transfer coefficients, thereby using a physically suitable heat transfer coefficient, and a method for predicting properties of a hot rolled steel sheet more accurately by using the method is provided. A method for predicting properties of a hot rolled steel sheet comprises: a first step of dividing the entire length of the hot rolled steel sheet into sections in the longitudinal direction to calculate cooling history(S11); a second step of measuring cooling information in a finishing mill delivery temperature measuring section and a coiling temperature measuring section(S11); a third step of setting an initial value of a heat transfer correction coefficient(S11); a fourth step of calculating heat transfer and phase transformation of the hot rolled steel sheet(S11); a fifth step of obtaining a difference between the temperature of the coiling temperature section measured in the second step and the temperature of the coiling temperature section calculated in the fourth step(S12); and a sixth step of checking whether the second to fifth steps have been performed relative to the entire length of the hot rolled steel sheet(S12), wherein the method further comprises: a step of repeatedly performing the fourth and the fifth steps if the temperature difference in the fifth step is greater than 1 deg.C; a step of adjusting and renewing the heat transfer correcting coefficient if the temperature difference in the fifth step is greater than 1 deg.C; and a seventh step of correcting the coiling temperature of the hot rolled steel sheet using a method for correcting a coiling temperature of a hot rolled steel sheet, and wherein if the prediction of properties of the hot rolled steel sheet is not proceeded relative to the entire length of the hot rolled steel sheet, the second to fifth steps are repeatedly performed relative to the entire length of the hot rolled steel sheet.</p> |
