US4872245A — Method and apparatus for manufacturing cold-rolle…

Claim 1

Independent Claim 171 words

A method of removing mill scale from the surface of hot-rolled strip coil in the manufacture of cold-rolled steel strip using an apparatus comprising an uncoiler linked to a scale removing unit by a first looper, a tandem cold-reduction mill linked to the scale removing unit by a second looper and a continuous annealing unit linked to the tandem cold-reduction mill by a third looper, comprising the steps of: breaking the mill scale on the surface of the hot-rolled strip coil by elongating the running hot-rolled strip coil to a predetermined percent elongation, controlling the predetermined percent elongation during the elongating of the hot-rolled strip coil as a function of at least one of the manufacturing conditions of the hot-rolled strip coil and the properties and quantity of the mill scale on the hot-rolled strip coil so that the top, bottom and middle thereof of the hot-rolled strip coil will be pickled at substantially the same speed; and removing the broken scale from the surface of the elongated hot-rolled strip coil.

Claim 2

Independent Claim 171 words

A method of removing mill scale from the surface of hot-rolled strip coil in the manufacture of cold-rolled steel strip using an apparatus comprising an uncoiler linked to a scale removing unit by a first looper, a tandem cold-reduction mill linked to the scale removing unit by a second looper and a continuous annealing unit linked to the tandem cold-reduction mill by a third looper, comprising the steps of: breaking the mill scale on the surface of the hot-rolled strip coil by elongating the running hot-rolled strip coil to a predetermined percent elongation, controlling the predetermined percent elongation during the elongating of the hot-rolled strip coil as a function of at least one of the manufacturing conditions of the hot-rolled strip coil and the properties and quantity of the mill scale on the hot-rolled strip coil so that the top, bottom and middle thereof of the hot-rolled strip coil will be pickled at substantially the same speed; and removing the broken scale from the surface of the elongated hot-rolled strip coil.

Claim 3

Dependent Claim 26 words

A method according to claim 1, in which the hot-rolled strip coil is elongated by not more than 7 percent by means of a tension leveller.

Claim 4

Dependent Claim 26 words

A method according to claim 1, in which the hot-rolled strip coil is elongated by not more than 7 percent by means of a temper mill.

Claim 5

Dependent Claim 35 words

A method according to claim 1, in which the broken scale is removed from the surface of the hot rolled strip coil by at least one of brush scrubbing, pickling, wet blasting and dry blasting.

Claim 6

Dependent Claim 41 words

A method according to claim 1, in which the breaking of mill scale and the removal of the broken scale are effected immediately before cold reduction in a continued series of process steps in which cold reduction is performed following descaling.

Claim 7

Dependent Claim 45 words

A method according to claim 1, in which the breaking of mill scale and the removal of the broken scale are performed immediately before cold reduction in a continued series of process steps in which cold reduction and continuous annealing are successively effected following descaling.

Claim 8

Independent Claim 166 words

A method of removing mill scale from the surface of hot-rolled strip coil in the manufacture of cold-rolled steel strip using an apparatus comprising an uncoiler linked to a scale removing unit by a first looper, a tandem cold-reduction mill linked to the scale removing unit by a second looper and a continuous annealing unit linked to the tandem cold-reduction mill by a third looper, comprising the steps of: breaking the mill scale on the surface of the hot-rolled strip coil by elongating the running hot-rolled strip coil to a predetermined percent elongation; removing the broken mill scale from the hot-rolled strip coil; detecting the condition of the mill scale downstream of at least one of the scale breaking and the scale removing steps adjacent the exit side thereof; and controlling the predetermined percent elongation as a function of the detected condition of the mill scale so that the top, bottom and middle of the hot-rolled strip coil can be pickled at substantially the same speed.

Claim 9

Independent Claim 166 words

A method of removing mill scale from the surface of hot-rolled strip coil in the manufacture of cold-rolled steel strip using an apparatus comprising an uncoiler linked to a scale removing unit by a first looper, a tandem cold-reduction mill linked to the scale removing unit by a second looper and a continuous annealing unit linked to the tandem cold-reduction mill by a third looper, comprising the steps of: breaking the mill scale on the surface of the hot-rolled strip coil by elongating the running hot-rolled strip coil to a predetermined percent elongation; removing the broken mill scale from the hot-rolled strip coil; detecting the condition of the mill scale downstream of at least one of the scale breaking and the scale removing steps adjacent the exit side thereof; and controlling the predetermined percent elongation as a function of the detected condition of the mill scale so that the top, bottom and middle of the hot-rolled strip coil can be pickled at substantially the same speed.

Claim 10

Dependent Claim 28 words

A method according to claim 7, in which the hot-rolled strip coil is caused to elongate by not more than 7 percent by means of a tension leveller.

Claim 11

Dependent Claim 34 words

A method according to claim 7, in which the broken scale is removed from the surface of the hot-rolled strip coil by at least one of brush scrubbing, pickling, wet blasting and dry blasting.

Claim 12

Dependent Claim 41 words

A method according to claim 7, in which the breaking of mill scale and the removal of the broken scale are effected immediately before cold reduction in a continued series of process steps in which cold reduction is performed following descaling.

Claim 13

Dependent Claim 45 words

A method according to claim 7, in which the breaking of mill scale and the removal of the broken scale are performed immediately before cold reduction in a continued series of process steps in which cold reduction and continuous annealing are successively effected following descaling.

Claim 14

Dependent Claim 28 words

A method according to claim 7, in which the hot-rolled strip coil is caused to elongate by not more than 7 percent by means of a temper mill.

Claim 15

Dependent Claim 41 words

A method according to claim 7, wherein said breaking step is performed using a tension-leveler-type scale breaker and said removing step is performed using a brush, and at least two pickling tanks including first pickling tank and a second pickling tank.

Claim 16

Independent Claim 197 words

A method of removing mill scale from the surface of hot-rolled strip coil in the manufacture of cold-rolled steel strip using an apparatus comprising an uncoiler linked to a scale removing unit by a first looper, a tandem cold-reduction mill linked to the scale removing unit by a second looper and a continuous annealing unit linked to the tandem cold-reduction mill by a third looper, comprising the steps of: breaking the mill scale on the surface of the hot-rolled strip coil by elongating the running hot-rolled strip coil to a predetermined elongation, controlling the predetermined percent elongation as a function of at least one of the manufacturing conditions of the hot-rolled strip coil and the properties and quantity of the mill scale on the hot-rolled strip coil so that the top, bottom and middle thereof can be pickled at substantially the same speed; removing the broken mill scale from the hot-rolled strip coil; detecting the condition of the mill scale downstream of at least one of the scale breaking and the scale removing steps adjacent the exit side thereof; and further controlling the predetermined percent elongation as a function of the detected condition of the mill scale.

Claim 17

Independent Claim 197 words

A method of removing mill scale from the surface of hot-rolled strip coil in the manufacture of cold-rolled steel strip using an apparatus comprising an uncoiler linked to a scale removing unit by a first looper, a tandem cold-reduction mill linked to the scale removing unit by a second looper and a continuous annealing unit linked to the tandem cold-reduction mill by a third looper, comprising the steps of: breaking the mill scale on the surface of the hot-rolled strip coil by elongating the running hot-rolled strip coil to a predetermined elongation, controlling the predetermined percent elongation as a function of at least one of the manufacturing conditions of the hot-rolled strip coil and the properties and quantity of the mill scale on the hot-rolled strip coil so that the top, bottom and middle thereof can be pickled at substantially the same speed; removing the broken mill scale from the hot-rolled strip coil; detecting the condition of the mill scale downstream of at least one of the scale breaking and the scale removing steps adjacent the exit side thereof; and further controlling the predetermined percent elongation as a function of the detected condition of the mill scale.

Claim 18

Dependent Claim 45 words

A method according to claim 14, in which the breaking of mill scale and the removal of the broken scale are performed immediately before cold reduction in a continued series of process steps in which cold reduction and continuous annealing are successively effected following descaling.

Claim 19

Dependent Claim 25 words

A method according to claim 14, in which the hot-rolled strip coil is elongated by not more than 7 percent means of a tension leveller.

Claim 20

Dependent Claim 26 words

A method according to claim 14, in which the hot-rolled strip coil is elongated by not more than 7 percent by means of a temper mill.

Claim 21

Dependent Claim 33 words

A method according to claim 14, in which the broken scale is removed from the surface of the hot-rolled breakdown by at least one of brush scrubbing, pickling, wet blasting and dry blasting.

Claim 22

Dependent Claim 41 words

A method according to claim 14, in which the breaking of mill scale and the removal of the broken scale are effected immediately before cold reduction in a continued series of process steps in which cold reduction is performed following descaling.

Claim 23

Dependent Claim 42 words

A method according to claim 14, wherein said breaking step is performed using a tension-leveler-type scale breaker and said removing step is performed using a brush, and at least two pickling tanks including a first pickling tank and a second pickling tank.

Claim 24

Dependent Claim 147 words

A cold-rolled steel strip manufacturing apparatus which comprises: an uncoiler linked to a scale removing unit by a first looper, a tandem cold-reduction mill linked to the scale removing unit by a second looper and a continuous annealing unit linked to the tandem cold-reduction mill by a third looper; the scale removing unit comprising a tension-leveller-type scalebreaker means for causing hot-rolled strip coil to elongate by 2 percent to 7 percent so that the top, bottom and middle thereof can be pickled at substantially the same speed, a brush unit to scrub off mill scale from the surface of the elongated hot-rolled strip coil and at least one pickling tank disposed such that the hot-rolled strip passes therethrough in series; and the scale removing unit being adapted to pass the entire length of the hot-rolled strip coil at a substantially constant speed through the tandem cold-reduction mill.

Claim 25

Dependent Claim 147 words

A cold-rolled steel strip manufacturing apparatus which comprises: an uncoiler linked to a scale removing unit by a first looper, a tandem cold-reduction mill linked to the scale removing unit by a second looper and a continuous annealing unit linked to the tandem cold-reduction mill by a third looper; the scale removing unit comprising a tension-leveller-type scalebreaker means for causing hot-rolled strip coil to elongate by 2 percent to 7 percent so that the top, bottom and middle thereof can be pickled at substantially the same speed, a brush unit to scrub off mill scale from the surface of the elongated hot-rolled strip coil and at least one pickling tank disposed such that the hot-rolled strip passes therethrough in series; and the scale removing unit being adapted to pass the entire length of the hot-rolled strip coil at a substantially constant speed through the tandem cold-reduction mill.

Claim 26

Dependent Claim 52 words

The apparatus as claimed in claim 21, further comprising means for controlling said tension-leveller-type scalebreaker means during elongation of the hot-rolled strip coil as a function of at least one of the manufacturing conditions of the hot-rolled strip coil and the properties and quantity of mill scale on the hot-rolled strip coil.

Claim 27

Dependent Claim 45 words

The apparatus as claimed in claim 22, wherein said means for controlling said tension-leveller-type scalebreaker means includes means for detecting the condition of the mill scale on the hot-rolled strip coil prior to the entry of the hot-rolled strip coil into said tension-leveller-type scalebreaker means.

Claim 28

Dependent Claim 41 words

The apparatus as claimed in claim 22, wherein said means for controlling said tension-leveller-type scalebreaker means includes means for detecting the condition of the mill scale on the hot-rolled strip coil after the hot-rolled strip coil passes through said pickling tank.

Claim 29

Dependent Claim 56 words

The apparatus as claimed in claim 22, wherein said means for controlling said tension-leveller-type scalebreaker means includes means for detecting the condition of the mill scale on the hot-rolled strip coil prior to the entry of the hot-rolled strip coil into said tension-leveller-type scalebreaker means and after the hot-rolled strip coil passes through said pickling tank.

Claim 30

Dependent Claim 100 words

The apparatus as claimed in claim 22, wherein said means for controlling said tension-leveller-type scalebreaker means includes means for detecting the condition of the mill scale on the hot-rolled strip coil between said brush unit and said pickling tank and after the hot-rolled strip coil passes through said pickling tank, said detecting means being electrically connected to a display means for indicating the condition of the mill scale detected by said detecting means whereby an operator can adjust said tension-leveller-type scalebreaker means to elongate the hot-rolled strip coil to a desired value within the range of 2 to 7 percent.

Claim 31

Dependent Claim 121 words

The apparatus as claimed in claim 22, wherein said means for controlling said tension-leveller-type scalebreaker means includes first detecting means for detecting the condition of the mill scale on the hot-rolled coil strip prior to the entry of the hot-rolled coil strip into said tension-leveller-type scalebreaker means and second detecting means for detecting the condition of the mill scale after the hot-rolled strip coil passes through said pickling tank, said second detecting means being electrically connected to a display means for indicating the condition of the mill scale detected by said second detecting means whereby an operator can adjust said tension-leveller-type scalebreaker means to elongate the hot-rolled strip coil to a desired value within the range of 2 to 7 percent.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1992-10-09	1993-04-10	1993-10-10	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1996-10-09	1997-04-10	1997-10-10	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2000-10-09	2001-04-10	2001-10-10	$7700.00	Window Closed / Lapsed

Method and apparatus for manufacturing cold-rolled steel strip

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