Metal treatment – Process of modifying or maintaining internal physical... – Utilizing disclosed mathematical formula or relationship
Patent
1994-06-07
1995-10-31
Rosenberg, Peter D.
Metal treatment
Process of modifying or maintaining internal physical...
Utilizing disclosed mathematical formula or relationship
C21D 9573
Patent
active
054626137
ABSTRACT:
A method and apparatus are provided for producing rods having a desired tensile strength from a rod manufacturing process set to an optimal operating condition. Initially, the rod manufacturing process is set in an optimal condition to produce rods at a maximum rate, while optimizing the mechanical properties therein. Raw materials are melted and a "heat of steel" representing one lot is poured into a ladle which is sampled to determine its chemical composition. The percentage content of each element is utilized within an empirical model modeling the rod manufacturing process to predict the tensile strength of rods. The empirical model is again utilized to determine the amount by which a control element must be varied to adjust the predicted tensile strength to the desired tensile strength. The control element represents an element, such as, carbon which significantly impacts the tensile strength of the rod. The predicted level of the control element necessary to achieve the target tensile strength is referred to as the "floating aim level" thereof. If the floating aim level exceeds a maximum accepted level for the control element the empirical model is again used to determine the necessary level of a second control element. Next, the heat of steel is trimmed to provide a lot having the target tensile strength.
REFERENCES:
patent: 4983227 (1991-01-01), Reiniche
Emperical Models for Predicting the Mechanical Properties of Reinforcing Bar, O. Delvecchio, C. Young, I&SM, Oct. 1985, pp. 10-14.
Mathmetical simulation of Stelmor process, R. D. Morales, A. Lopez G., I. M. Olivares, Ironmaking and Steelmaking, 1991, vol. 18, No. 2, pp. 128-138.
Microstructural Engineering Applied to the Controlled Cooling of Steel Wire Rod, P. C. Campbell, E. B. Hawbolt, J. K. Brimacombe, Metallurgical Transactions A, Nov. 1991, vol. 22A, pp. 2769-2805.
Novel model for accurate calculation of hardenability and continuous cooling transformation, R. J. Mostert and C. T. van Rooyen, Materials Science and Technology, Sep. 1991, vol. 7, pp. 803-810.
Glodowski Robert J.
Wilson, III Allyen E.
GS Technologies Corporation
Rosenberg Peter D.
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