01 Select the right supplier
The finish is created by impacting spherical particles on to the surface of metal under controlled conditions, creating a work-hardened surface that is hard-wearing and increases the material’s resistance to antisocial behaviour and scratching. For the even, flat surfaces required in construction-related projects, only select a supplier that has an automated system. Hand-peening is suitable only for uneven surfaces, such as artworks.
02 Select the right finish
Specifiers can usually select a specification “written” as a sample, or select a finish from a range of samples. Several factors have to be considered, including thickness and type of material, desired finish, in-situ conditions, as well as usage and maintenance requirements.
03 Check accreditation
Suppliers should also be certified under the National Aerospace and Defence Contractors Accreditation Program (NADCAP), a global cooperative accreditation program for aerospace engineering, defence and related industries.
04 Standards
No relevant British Standard applies in this area. However, many suppliers work to a specification standard published by the British Stainless Steel Association.
05 Consider your materials
As well as stainless steel, other metals can be successfully peened, including bronze and aluminium (prior to anodisation). The finish is often specified for cladding panels, skirtings, doors and in handrails, and is often seen in London Underground and mainline railway stations.
By Chris Pallot, business development manager at Impact Finishers. Visit www.wheelabratorgroup.com for more information
