Category: European Standardisation (page 2)
Standards, Specifications & Grades
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BS EN ISO 3506 replaces BS6105. Part 1 covers bolts, screw and studs, part 2 nuts and part 4 tapping screws. The chemical compositions are common to the various parts. Austenitic grades A1 A2 and A4 are shown and compared to bar grades, 303, 304, 349S17, 316, and 394S17. Mechanical properties for property class, 50, 70, and 80 austenitic bolts and studs and property class, 20H, 25H, 30H, and 40H tapping screws are tabulated and the fastener designations, such as, A2-70, and A4-25H described. Duplex FA, (ferritic-austenitic similar to 1.4462, (2205), of EN 10088-1), is a likely future grade for inclusion in the standard. Fastener grade selection is covered in annexes to the standards. The standards lists grades, 1.4439, 1.4539, (904L), 1.4529, (6% molybdenum austenitic), and 1.4462, (2205), as suitable for reducing the risk of chloride induced stress corrosion cracking failures in applications such as indoor swimming pools.
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An overview of welding stainless steels is given, with particular reference to the various welding methods that can be used. These include Gas Tungsten Arc Welding, (GTAW or TIG), Plasma Arc Welding, (PAW), Shielded Metal Arc Welding, (SMAW or MMA), Gas Metal Arc Welding, (GMAW or MIG / MAG), Flux Cored Arc Welding, (FCAW or FCW), Submerged Arc Welding, (SAW), Electric Resistance Welding, (ERW), Laser Welding. Standards mentioned include BS EN 1600, BS EN 12072, BS EN 12073, BS EN 760, BS EN 287 Part 1, (Approved testing of welders for fusion welding), BS EN 288 Part 3 Welding Procedure tests for the arc welding of steels.
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