Ytrengöring

This document specifies requirements for high chromium white cast iron grit, as supplied for blast-cleaning processes. It specifies ranges of particle sizes, together with corresponding grade designations. Values are specified for hardness, density, defect/structural requirements, metallographic structure and chemical composition. The requirements specified in this document apply to abrasives supplied in the new condition only. They do not apply to abrasives either during or after use. High chromium white cast iron grits are used in both static and site blasting equipment. They are most often selected where there is a possibility for the recovery and re-use of the abrasive. NOTE 1 Although this document has been developed for preparation of steelwork, these materials are predominantly used for non-ferrous substrates. The properties specified will generally be appropriate for use when preparing other material surfaces, or components, using blast-cleaning techniques, and can be used for applications where no subsequent coating is applied. NOTE 2 Whenever dissimilar metals are used together, galvanic corrosion can occur.

This document specifies a series of rust grades and preparation grades of steel surfaces. This document describes the preparation grades of the substrate based on visual assessment of the initial rust grade, preparation method used and visual evaluation of the resulting degree of cleanliness. It is applicable to hot-rolled steel surfaces prepared for painting by methods such as blast-cleaning, hand or power tool cleaning and acid pickling. These methods are primarily intended for removing firmly adhering mill scale on hot rolled steel. They can be used to remove coatings, mill scale or other firmly adhering extraneous material. This document is also applicable to steel substrates that show residues of firmly adhering paint and other foreign matter in addition to residual mill scale.