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US 4,168,993 AGranted
Process and apparatus for sequentially forming and treating steel rod
AssigneeMorgan Construction Company
InventorsNorman A. Wilson, Asjed A. Jalil, Vito J. Vitelli
Life of this patent
Estimating the term…
Abstract
A process and apparatus for rolling and cooling medium to high carbon steel rod is provided wherein the rod is rolled at high speed and laid in rings directly onto a conveyor at high temperature. Thereafter high velocity hot water is sprayed onto the rings to cool them to a temperature near to but above A.sub.3. Transformation is then started while applying air to the rod, and while substantial parts of the rod are transforming, further accelerated cooling is again applied to the rod.
Claims15
A process for forming and treating steel rod comprising the steps of:
- (a) continuously hot rolling steel into rod form at high speed at a temperature substantially above A.sub.3 and producing therein an austenitic grain structure immediately after rolling in which extremely small uniformly dispersed austenite grains, formed by recrystallization throughout the cross-section, are rapidly combining to form larger grains under conditions of excess heat above A.sub.3 ;
- (b) reducing the forward velocity of said rod to a substantial standstill by coiling same into rings;
- (c) moving said rings away from the point of coiling to provide gaps between substantial portions of each successive ring;
- (d) cooling said rings by substantially immersing them sequentially in a liquid cooling medium directly after coiling them and while moving them;
- (e) successively terminating the immersion of the rings in said medium before the temperature of any part of any ring has descended below the knee of the outer curve of the transformation diagram of the particular steel in process;
- (f) successively blowing air on said rings to further cool same until transformation of the austenite starts at a multiplicity of places around said rings successively, and thereafter,
- (g) further successively cooling the remaining portions of said rings until transformation of the austenite is complete.
4 more elements
A process for forming and treating steel rod comprising the steps of:
- (a) continuously hot rolling steel into rod form at high speed at a temperature substantially above A.sub.3 and producing therein an austenitic grain structure immediately after rolling in which extremely small uniformly dispersed austenite grains, formed by recrystallization throughout the cross-section, are rapidly combining to form larger grains under conditions of excess heat above A.sub.3 ;
- (b) reducing the forward velocity of said rod to a substantial standstill by coiling same into rings directly after rolling;
- (c) moving said rings away from the point of coiling to provide gaps between substantial portions of each successive ring;
- (d) intermittently cooling said rings by substantially immersing them sequentially in water for successive brief periods directly after coiling them and while moving them;
- (e) reducing the cooling effect of said water to a minimum by preheating same virtually to its boiling point;
- (f) terminating the immersion of said rod in said cooling water and said cooling step before the temperature of any part of said rod has descended below the knee of the outer curve of the transformation diagram of the particular steel in process;
- and thereafter,
- (g) cooling at least a substantial portion of said rod through transformation by the application thereto of a gaseous cooling medium.
5 more elements
Apparatus for forming and treating steel rod comprising:
- (a) means for continuously hot rolling steel rod into form at high speed at a temperature substantially above A.sub.3 and producing therein an austenitic grain structure immediately after rolling in which extremely small uniformly dispersed austenite grains, formed by recrystallization throughout the cross-section, are rapidly combining to form larger grains under conditions to excess heat above A.sub.3 ;
- (b) means for coiling said rod into rings directly after rolling;
- (c) means for moving said rings away from the point of coiling to provide gaps between substantial portions of each successive ring;
- (d) first means for cooling said rings by substantially immersing them sequentially in a liquid cooling medium directly after coiling them and while moving them;
- (e) means for successively interrupting the cooling of the rings in said medium before the temperature of any part of said rod has descended below the knee of the outer curve of the transformation diagram of the particular steel in process;
- (f) second means for thereafter air cooling said rings successively until substantial portions of the austenite therein starts to transform;
- and
- (g) third means for thereafter further cooling the remaining portions of said rings through transformation successively.
5 more elements
Apparatus for forming and treating steel rod comprising:
- (a) means for continuously hot rolling steel into rod form at high speed at a temperature substantially above A.sub.3 and producing therein an austenitic grain structure immediately after rolling in which extremely small uniformly dispersed austenite grains, formed by recrystallization throughout the cross-section, are rapidly combining to form larger grains under conditions of excess heat above A.sub.3 ;
- (b) conveyor means for moving said rings away from the point of coiling to provide gaps between substantial portions of each successive ring;
- (d) means for applying a high velocity jet of a liquid coolant to each ring successively, both to cool said rings and to cause said rings to move relatively to each other while cooling.
Dependencies are inferred from the claim text.