Metal treatment – Process of modifying or maintaining internal physical... – Heating or cooling of solid metal
Patent
1996-01-31
1998-09-22
Yee, Deborah
Metal treatment
Process of modifying or maintaining internal physical...
Heating or cooling of solid metal
72229, 72201, C21D 802
Patent
active
058109510
ABSTRACT:
The in-line combination of a reversing rolling mill (Steckel mill) and its coiler furnaces with accelerated controlled cooling apparatus immediately downstream thereof and associated method permits steel to be sequentially reversingly rolled to achieve an overall reduction of at least about 3:1, imparted by a first reduction while the steel is kept at a temperature above the T.sub.nr by the coiler furnaces so as to preserve an optimum opportunity for controlled recrystallization of the steel after each rolling pass, and a second reduction while the temperature of the steel drops from about the T.sub.nr to about the Ar.sub.3. The second reduction is preferably of the order of 2:1 as a result of which the steel reaches a final plate thickness. The steel product then passes through the accelerated controlled cooling apparatus, preferably applying laminar flow cooling at least to the upper surface of the steel passing therethrough so as to reduce the temperature of the steel from about the Ar.sub.3 to a temperature at least about 250 C. to about 300 C. or more below the Ar.sub.3 at a cooling rate of at about 12 C. to about 20 C. and preferably about 15 C. per second, thereby to achieve a preferred fine-grained predominantly bainite structure affording enhanced strength and toughness in the final steel product.
REFERENCES:
patent: 4658363 (1987-04-01), Tippins et al.
patent: 5276952 (1994-01-01), Thomas et al.
patent: 5414923 (1995-05-01), Thomas et al.
The Making, Shaping and Treating of Steel, 10th Edition, 1985, published by the Association of Iron & Steel Engineers, Chapter 41, Section 8, pp. 782-785.
On the Fundamentals of HSLA Steels, Cohen and Hansen, HSLA Steels Metallurgical Applications, Proceedings and Conference, Bejing, China, 1985, pp. 61-70.
Intensive Cooling: 3.7m Heavy Plate Mill, Thyssen Stahl AG, Duisburg-Sud/B.R. Deutschland.
Barrigar Robert H.
IPSCO Enterprises Inc.
Yee Deborah
LandOfFree
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