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The Online Stainless Steel in Construction Information Centre www.stainlessconstruction.com has become available.
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This publication has been prepared by the BSSA for the RIBA CPD Providers Network. It lists sources of information from the BSSA website, (articles and publications), the Nickel Institute, Steel Construction Institute, Euro Inox, Outokumpu, and the Australian and South African Stainless Steel Development Associations. These are grouped in topics that include Designing for Durability, Surface Finishes, Fabrication, Environmental Issues, Source of Supply, Architectural and Structural Applications.
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SCI Design Guide for stainless steel
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Site location is the initial consideration in selection of stainless steels for external applications. These are classified as rural, urban, industrial or marine. Micro-climates can influence the steel type selection. Other factors that influence the selection are surface finish, design, fabrication methods, accessibility for cleaning and maintenance and mechanical and physical properties of the steels. The main steel types 304 and 316 only are considered for UK external applications. (102)
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The appeal of stainless steels for internal applications is based on their corrosion resistance and wide range of finishes and textures available. For most building interiors intended for human occupation, either the ferritic, 430, (1.4016), type or the austenitic, 304, (1.4301), type are suitable. Grade, surface finish, fabrication and routine cleaning procedures are all important considerations. Fingermarking can be avoided by correct surface treatments. (101)
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Surface finishes for stainless steel sheet, (coil, strip), and plates, are specified in BS EN 10088-2:2005. Ex-mill hot and cold rolled finishes and special finishes are tabulated. These include mill finishes, 1D, (heat treated), 1E, 2B, (skin passed), 2C, 2D, (pickled), 2E, (mechanically descaled), 2H, (work hardened), 2R, (bright annealed, reflective), and 2Q, (hardened and tempered). Special finishes include 1G, 2G, (ground), 1J, 2J, brushed or dull polished, 1K, 2K, satin polished, 1P, 2P, bright polished, 1M, 2M, patterned 2W, corrugated, 2L, coloured and, 1S, 2S, surface coated. Electropolished, shot and bead blasted and peened finishes are not covered by BS EN 10088-2. Where available representative Ra surface roughness values are given for these finishes. A comparison of BS 1449-2 DIN and ASTM A480 surface finish symbols to those now used in BS EN 10088-2 is also shown. (100)
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This IMOA publication describes a selection process for stainless steel grades in external applications. A rating (scoring) process for site evaluation, design and proposed maintenance is described. Environments are divided into categories of rural, urban and industrial pollution. The effect of chlorides is then assessed by rating the site in terms of its proximity to coastal or marine salt exposure, (de-icing salt), and local weather patterns. The combined design effects of surface finish, elevation, (orientation), and natural rain washing are considered and finally the proposed maintenance, (washing / cleaning), schedule. The total scores can then be used in the selection process. Grades considered in this rating process include 304 / 304L, (1.4301 UNS S30400), 316 / 316L, (1.4401 UNS S31600), 317L, (1.4438 UNS S31703), and more highly alloyed grades including 2205, (1.4462 UNS S31803 32205), and 904L, (1.4539 UNS S08904)
IMOA have designed the free interactive Stainless Steel Evaluation Software program to help with these issues: (Web site disclaimer | software disclaimer)
Go to the IMOA Website to download the software which is PC and Mac compatible
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Stainless Steel Handrails and Street Furniture under conditions of moderate urban pollution and moderate to high de-icing salt exposure.
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Stainless Steel Exterior Wall Panels and Window Frames under conditions of moderate urban pollution and moderate de-icing salt exposure.
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Stainless Steel Light Poles under conditions of moderate urban and rural pollution levels and moderate de-icing salt exposure.
