摘要:
The invention relates to a cold-rolled and recrystallisation annealed flat steel product with a ferritic micro-structure, having an optimised formability and suitability for painting. In addition, the flat steel product is formed by a steel having C: 0.0001-0.003 wt.%, Si: 0.001-0.025 wt.%, Mn: 0.05-0.20 wt.%, P: 0.001-0.015 wt.%, Al: 0.02-0.055 wt.%, Ti: 0.01-0.1 wt.%, as well as respectively optionally Cr: 0.001-0.05 wt.%, V: up to 0.005 wt.%, Mo: up to 0.015 wt.%, N: 0.001-0.004 wt.%. In addition, the flat steel product has the following mechanical characteristics: Rp0.2 ≤ 180 MPa, Rm ≤ 340 MPa, A80 ≤ 40%, n-value ≤ 0.23. Furthermore, on at least one of the surfaces thereof, the flat steel product has an arithmetic roughness average Ra of 0.8-1.6 µm and a peak value RPc of 75/cm. The production of the flat steel product involves, in a continuous process in a N2-H2- annealing atmosphere, the recrystallisation annealing thereof, and an overaging process. Subsequently, the flat steel product undergoes a skin-pass rolling by means of a working roller and with a skin-pass rate D of 0.4-0.7%, the circumferential surface of which working roller has a roughness average Ra of 1.0-2.5 µm and a peak value RPc ≥ 100/cm, wherein the peaks and depressions shaped into the surface of the skin-pass working roller are provided in a stochastically distributed manner.
摘要:
The invention relates to a device for cleaning a roller (1) of a system for machining a strip-type material, comprising at least one jet nozzle (5), which directs a fluid stream onto the surface (2) of the roller (1), and at least one suction channel (8). The at least one jet nozzle (5) and the at least one suction channel (8) are arranged in a hood (4), and the hood (4) covers part of the circumference of the roller (1). The at least one jet nozzle (5) is arranged at an angle of +/- 45° relative to the vertical on the surface (2) of the roller (1) and at a distance of less than 50 mm from the surface (2) of the roller (1).