Stainless steel processing and key construction technology

On stainless steel surface treatment methods varieties at present: (1) surface ecru bleaching treatment; (2) the mirror bright surface treatment; (3) surface coloring treatment. Surface color bleaching processing: stainless steel in the process of machining, through rolled plate, edge, welding or through artificial surface fire heating processing, producing black oxide coating. The hardness of film of oxide skin mainly NiCr2O4 and NiF two EO4 composition, before the general removal using strong corrosion of hydrofluoric acid and nitric acid method. But this method cost, environmental pollution, harmful to human body, corrosion resistance, be being washed out gradually. At present to scale processing method mainly has two kinds: (1) sandblasting ( Pill) Method: mainly adopt the method of spray micro glass bead, remove black oxide on the surface of the skin. 2 chemical method: using a non-polluting pickling passivation paste and room temperature non-toxic cleaning fluid with inorganic additives for baptism. To achieve the aim of bleaching processing stainless steel color. Handle is largely seems to be a light color. This method is useful for large, complex products is. Drawing processing, easy to produce friction heat using pressure, high heat resistance and stainless steel kinds of processing after the end of at the same time should get rid of the surface of oil. Before welding, welding should be thoroughly get rid of harmful to welding of rust, oil, water, paint, etc. , selected suitable electrode steel grade. From spot welding time shorter than carbon steel welding spacing, get rid of stainless steel brush should be used when welding slag. After welding, in order to prevent the local corrosion or intensity drops, dealing with the surface of ground treatment or cleaning. Cutting, stamping, due to the high strength stainless steel than ordinary materials, so the punching and shearing need higher pressure, and a knife and knife gap accurately can not occur when the shear and work hardening, had better use plasma or laser cut, when to use gas cutting or arc cutting, grinding was carried out on the heat affected zone and the need for heat treatment. Bending processing: thin plate bending to 180, but in order to reduce the surface crack with radius of 2 times the thickness of the best size, the plate along the rolling direction to 2 times the radius of thickness, and rolling vertical bending to 4 times the thickness of the radius is necessary, especially at welding, in order to prevent cracking deal with welding processing zone in surface grinding. In order to prevent scratches and pollutants during the construction of attached sticker status under the stainless steel construction. But with the extension of time, the paste liquid residue to use time limit for the sticker, get rid of sticker should carry on the surface after washing, construction and use of special stainless steel tools, and general steel clean utility tool, in order not to let the iron stick should be cleaned. Should pay attention to not let has a strong corrosive magnetic and gypsum clean with drugs come into contact with the surface of stainless steel, if the contact should be immediately when washing. After the construction application of neutral detergent and water washing, the blues until the surface of cement. Escrow: when should pay attention to moisture, dust, oil, lubricating oil and so on, and surface rust, welding or poor corrosion resistance. Between film and the steel substrate immersed in water, the corrosion speed is faster than when no sticker instead. Warehouse keeper should be placed in a clean, dry hui to the wind, keep the original packaging, film of stainless steel should avoid direct light, sticker should be examined periodically, if the paster metamorphism ( The paster life 6 months) Should immediately replace, add pad of paper packaging materials if wet, to prevent surface corrosion should immediately remove pad of paper. Transportation: in order to avoid the surface scratch with rubber or sleeper, adopt stainless steel material, specially used for protection of as much as possible to avoid fingerprints of surface pollution, should wear gloves when operating.