Patent ID: 6053996
Filing Date: 2000-04-25
Classification: B21B,C21D

Abstract:
A method for the manufacture of a strip of formable steel, comprising the steps of, in the following order:(i) by continuous casting, forming liquid steel into a slab having a thickness of not more than 100 mm,(ii) rolling said slab, while still hot from its casting and in the austenitic region, into an intermediate slab having a thickness in the range 5 to 20 mm,(iii) cooling said intermediate slab of step (ii) to a temperature which is below the Ar.sub.3 temperature of the steel,(iv) holding said cooled intermediate slab in an enclosure for temperature homogenization thereof,(v) rolling said held intermediate slab into a strip, with at least one rolling pass applying a thickness reduction of more than 50%, said held intermediate slab during rolling being at a temperature in the range from above 200.degree. C. to below a temperature T.sub.t at which 75% of the steel is converted into ferrite,(vi) coiling said strip at a temperature above 500.degree. C.