The efficient service center, equipped with state-of-the-art equipment, allows custom sheet metal finishing and meets all the required surface machining required, such as scotch-brite brushing, grinding, polishing, marbling, duplo and the application of the protective film. Below we list the main surface finishes.
The surface finishes of the various iron and steel products are coded In European Standard UNI EN 10088, Part 2 lists the types of surface finishes of flat products and Part 3 lists the types of finishes of semi-finished products and long products. We need to distinguish them in laminating finishes and abrasion finishes.
STANDARD FINISHING FOR LAMINATION
Surface finishes for rolling are obtained from the steel product (strip, sheet, pipe, etc.) directly from the steel mill by means of cycles following the rolling mill. The most common are:
Finishing no. 0 It provides for the simple hot rolling of the stainless steel coil or sheet, followed by heat treatment, no pickling is planned.
Finishing no. 1 / 1D It is the typical finishing of hot rolled sheets and coils. It involves hot rolling, subsequent heat treatment of annealing, recrystallization or solubilization depending on the types of stainless steels, followed by a pickling treatment. Typical for large thicknesses. The appearance is silvery gray, opaque, slightly rough with very low reflectivity.
Finishing no. 2D (D=dull) It is the finishing that is obtained by cold rolling with a thickness reduction of at least 20% on hot rolled sheets and coils with no. 1 finishing, thermally treated, pickled. A Softening process follows cold rolling (recoating, recrystallization or solubilization depending on the types of stainless steels) and then picking. The appearance is silvery gray, opaque, smooth (the surface is much polished than the previous case).
Finishing n. 2B (B= bright) It is the finish obtained on the sheets and coils with n.2D finishing by means of a cold-film rolling (skin-pass) with polished cylinders. It is the most widespread finish for cold laminated sheets and forms the base for subsequent shiny or brushed finishes. The look is silvery gray, brilliant, smooth.
Finishing BA / 2R (BA=bright annealed) It is a finishing of cold rolled sheets and coils obtained by heat treatment of annealing, recrystallization or solubilization (depending on the types of stainless steels) in inert atmosphere after rolling and subsequent degreasing. Given the type of heat treatment, the material is not oxidized and consequently does not undergo the pickling operation, maintaining a very shiny and brilliant appearance.
STANDARD FINISHINGS FOR ABRASION
Surface finishes for abrasion are those finishes that are made on some stainless steels, by abrasive materials of appropriate grain size, which affect the surface of the steel to a certain depth.
Finishing 1J - 2J (SCOTCH-BRITE):
Is a one-way brushing process that makes the surface perfectly uniform. It is carried out by means of special abrasive fabric rollers, which cause slight engravings on the surface, allowing to remove the imperfections on the material, ensuring the quality of the finished product. Decent reflection.
Finishing 1K - 2K (GRINDING): The process takes place through the use of variable grain abrasive paper, scratching the surface with a small amount of material removal, ensuring a good uniformity of roughness across the surface, removal of oxides and other impurities and allows a good non reflective finish appearance. The grain numbers indicate the roughness of the finished product, for example the grain 80 is the most coarse, while the 320 is the finest among the standard grains.
POLISHING 2P: It is a process that allows to polish and transform the matt surface into a surface that reflects light, through fine grain abrasives or waxy substances.
DUPLO: The double finish is obtained through a first satination passage and a second brush step to reduce the roughness ridges. It has an aesthetic look of satin with a roughness similar to that of scotch-brite.
MARBLING: It is carried out with small circular brushes that scratch the surface and create the effect of overlapping discs.
Let's point out that the encodings for stainless steel finishes are different from EN 10088-2 and ASTM A 480 / A 480M.