Spray and fused coatings
Stärker mit Stärker mit Castolin Eutectic
Castolin Eutectic
C A STO L A B S E RV I C E S
High quality repair for steel plant rolls
High quality rebuild surface according to OEM’s recommended Castolin powders. • Highly experienced workshop for perfect coating quality. • Large and heavy parts coated without cracks or deformation. • Smooth and highly wear resistant surface.
Spray and fused coatings repairs for steel rolls
Vital parts In steel hot rolling plants, rolls are critical parts that are used for conveying and forming slabs and plates at a very high temperature. The extreme working loads as well as the high temperature wear-out the rolls surface and, as a result, parts are damaged. Maintenance managers regularly have to decide if either scrap these expensive pieces or try to repair them according to OEM specifications.
Repairing rollers OEM usually provide parts that have the surface coated with high wear resistant alloy such as Castolin 12496. This coating is applied first by spraying a powder on the roller surface and then by fusing it just above the liquidus temperature. The process allows the coating to offer its best wear resistant properties and to perfectly bound on the steel substrate. On long and heavy pieces, fusion is extremely difficult to be done correctly. Just after the spraying step, the part must be pre-heated homogeneously and kept in temperature while several torches fuse the powder all along the roll. For instance, in 2m long massive rolls, fusion may require up to 7 hours and any variation in temperature may result on a irregular surface quality. Since the part is exposed to very high temperature, deformation is also critical, especially on rolls made with thin wall tubes. Finally, if cooling is not well managed, thermal stresses can be so high that cracks may appear on the overlay. Only a well experienced workshop with deep know-how can ensure a perfect coating quality and a good part geometry once the fusion is finished. Spray
Pre-heating
Fusion
Controlled cooling
Heavy steel rollers coated by CastoLab Since many years, CastoLab sprays and fuses large and heavy rolls, in particular for steel mill plants. Our well equipped workshop as well as the experience we gained during more than 10 years of projects allow us to offer high quality overlays. Parts are coated by high skilled operators that follow strict manufacturing methods; they regularly apply several powders according to what has been defined by OEM’s. Powders
12494
12495
12496
12497
12112
12999
This explains why steel plants maintenance subcontractors as well as end-users regularly rely on our competences. Your sales representative will be happy to explain our offer in detail. Do not hesitate to contact him for additional information.
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