Selection of stainless steel for façade anchoring systems
Proper design of a substructure for façade installation requires a suitable solution and the material of the anchoring element. It is very important to select the right steel grade for the anticipated operating conditions.
According to Standard EN 10088, austenitic steel is divided into grades: 1.4301,1.4305, 1.4306, 1.4307,1.4310, 1.4401, 1.4435, 1.4436, 1.4438, 1.4439,1.4529, 1.4539, 1.4541, 1.4547, 1.4550, 1.4571 Ferritic steel is divided into grades: 1.4000, 1.4003, 1.4016, 1.4510. Martensitic steel is divided into grades: 1.4006, 1.4021, 1.4028, 1.4031, 1.4034, 1.4057, 1.4122.
Ferritic-austenitic steel is divided into grades: 1.4362, 1.4410,1.4460, 1.4462
Corrosivity category C2 Low atmospheric corrosivity.
Outside: Atmospheres with low levels of pollution. Mainly rural areas.
Inside: Unheated buildings where condensation may occur, e.g. warehouses, sports halls.
Corrosivity category C3 Medium corrosivity of the atmosphere.
Outside: Urban and industrial atmospheres, medium SO2 pollution. Coastal areas with medium salinity.
Inside: Production premises with high humidity and some air pollution, e.g. food plants, laundries, breweries.
Corrosivity category C4 Highly corrosive atmosphere.
Outside: Industrial areas and coastal areas with medium salinity.
Inside: Chemical plants, swimming baths, ship repair yards.
Corrosivity category C5-I Very high - industrial atmosphere
corrosivity.
Outside: Industrial areas with high humidity and aggressive atmospheres.
Inside: Buildings and areas with almost continuous condensation and high pollution.
Corrosivity category C5-M Very high - marine atmosphere corrosivity.
Outside: Coastal and distant offshore areas with high salinity.
Inside: Buildings and areas with almost continuous condensation and high pollution.
Basic chromium stainless steels with a ferritic structure have good corrosion resistance in internal applications (except in extremely aggressive environments, such as in a swimming pool hall). The commonly used austenitic chrome-nickel steel grade 1.4301 and 1.4307 according to PN-EN 10088-1 can be used for internal and external components exposed to the atmospheric environment with corrosivity category C3 according to PN-EN ISO 9223.