Proposed Changes to Sharp Edge Standards
A proposed revision to AS/NZS 2312 1994, The Guide to the Protection of Structural Steel Against Exterior Atmospheric Corrosion by the use of Protective Coatings, has been released for industry discussion. Fabricators need to consider their current processes and methods to address the following proposed changes to edge rounding specifications:
3.4.3 Sharp edges
Slit sections, such as slit flats or welded three plate beams, or the non specified radius areas of hot rolled sections to AS/NZS 3679.1, may not have rounded corners along the beam as a result of the manufacturing process. If the paint specification requires sharp edges and corners to be rounded or bevelled prior to surface preparation, this needs to be identified as a note on the drawing documentation and specification. Where a minimum radius of 2mm is required by the paint manufacturer or specifier for adequate paint thickness, this requirement needs to be included on the specification documents provided to the steel fabricator. Holes for bolts or other fixings should also have their edges rounded. Rounding edges is expensive and labour intensive and may not be necessary in milder environments.
The appendix of AS 1627.01997 Metal finishing – Preparation and pre treatment of surfaces – Part 0: Method Selection Guide, which gave examples of surface preparation specifications, has been deleted. Advice on the preparation of coating specifications is now given in AS/NZS 23121994. Preview and purchase: Guide to the Protection of Structural Steel Against Exterior Atmospheric Corrosion by the use of Protective Coatings.
Is your business positioned with the machinery that will efficiently meet the corrosion resistant specification requirement?
How does a fabricator lower the cost per part to produce up to a 2mm radius on laser or plasma cut parts to comply with the corrosion protection standards?
Insights on how to remove labour intensive edge rounding processes such as angle grinders, manual belt sanding and deburring machines from your workshop are shared in the following case study: