Method for processing a metal slab or billet, and product produced using said method
AssigneeCorus Technology BV
InventorMenno Rutger Van Der Winden
Life of this patent
Estimating the term…
Abstract
The invention relates to a method for processing a metal slab or billet, in which the slab or billet is passed between a set of rotating rolls of a rolling mill stand to roll the slab. According to the invention, the rolls of the rolling mill stand have a different peripheral velocity, the difference in peripheral velocity amounting to at least 10% and at most 100%, and the thickness of the slab being reduced by at most 15% for each pass or the diameter of the billet in the plane of the rolls being reduced by at most 15%. The invention also relates to a plate or billet produced using the method, and to the use of this plate or billet.
Claims63
A method for processing a workpiece selected from the group consisting of a metal slab or billet, comprising:
- rolling comprising passing the slab or billet between a set of rotating rolls of a rolling mill stand to roll the slab or billet,
- wherein the slab or billet is introduced between the rolls at an angle of between 10 and 25° with respect to a perpendicular to a plane through center axes of the rolls,
- wherein the slab has a thickness of at least 32.5 mm at commencement of said passing step;
- and
- wherein the rolls of the rolling mill stand comprise a faster roll and a slower roll-which respectively have a peripheral velocity, and the peripheral velocity of the faster roll is at least 10% and at most 50% greater than the peripheral velocity of the slower roll, and
- the thickness of the slab is reduced by the rolling by at most 15% per pass, or a thickness of the billet in the plane of the rolls is reduced by at most 15% per pass, by the rolling,
- wherein, after passing of the slab or billet between the set of rotating rolls of the rolling mill stand to roll the slab or billet once, the passing of the slab or billet between the set of rotating rolls of the rolling mill stand to roll the slab or billet is repeated at most one time.
A method for processing a workpiece selected from the group consisting of a metal slab or billet, comprising:
- rolling comprising passing the slab or billet between a set of rotating rolls of a rolling mill stand to roll the slab or billet,
- wherein the slab or billet is introduced between the rolls at an angle of between 10 and 25° with respect to a perpendicular to a plane through center axes of the rolls, wherein the slab has a thickness of at least 32.5 mm at commencement of said passing step;
- and
- wherein the rolls of the rolling mill stand comprise a faster roll and a slower roll which respectively have a peripheral velocity, and the peripheral velocity of the faster roll is at least boo and at most 50% greater than the peripheral velocity of the slower roll, and
- the thickness of the slab is reduced by the rolling by at most 8% per pass, or a thickness of the billet in the plane of the rolls is reduced by at most 8% per pass, by the rolling,
- wherein, after passing of the slab or billet between the set of rotating rolls of the rolling mill stand to roll the slab or billet once, the passing of the slab or billet between the set of rotating rolls of the rolling mill stand to roll the slab or billet is repeated at most two times.
A method for processing a workpiece selected from the group consisting of a metal slab or billet, comprising:
- rolling comprising passing the slab or billet between a set of rotating rolls of a rolling mill stand to roll the slab or billet,
- wherein the slab or billet is introduced between the rolls at an angle of between 10 and 25° with respect to a perpendicular to a plane through center axes of the rolls,
- wherein the slab has a thickness of at least 32.5 mm at commencement of said passing step;
- and
- wherein the rolls of the rolling mill stand comprise a faster roll and a slower roll which respectively have a peripheral velocity, and the peripheral velocity of the faster roll is at least 10% and at most 50% greater than the peripheral velocity of the slower roll, and
- the thickness of the slab is reduced by the rolling by at most 15% per pass, or a thickness of the billet in the plane of the rolls is reduced by at most 15% per pass, by the rolling,
- wherein the slab or billet is reduced in thickness at most 15% by the method.
Dependencies are inferred from the claim text.