{"id":2534,"date":"2014-06-28T02:09:20","date_gmt":"2014-06-27T16:09:20","guid":{"rendered":"https:\/\/neumannindustrialcoatings.com.au\/rust-grading-and-classes-of-abrasive-blasting\/"},"modified":"2023-05-23T11:28:12","modified_gmt":"2023-05-23T01:28:12","slug":"rust-grading-and-classes-of-abrasive-blasting","status":"publish","type":"post","link":"https:\/\/neumannindustrialcoatings.com.au\/rust-grading-and-classes-of-abrasive-blasting\/","title":{"rendered":"Rust Grading and More!"},"content":{"rendered":"\t\t
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All abrasive blasting is done in accordance with Australia Standards AS 1627.4-2005\u00a0 (r2017) Metal finishing\u2014Preparation and <\/strong>pretreatment of surfaces Part 4: Abrasive Blast Cleaning of Steel<\/strong><\/em> and conforms to Queensland and Worksafe\u00a0Code of Practice – Abrasive Blasting – 2020.<\/strong><\/em><\/p>

Initial Surface Assessment as per AS 1627.4-2005<\/h4>

The surface of hot rolled steel may be defined according to one of four initial rust grades\u00a0defined and illustrated in AS 1627.9 (and as shown by the approximate examples below)<\/em> depending on the relative amounts of mill scale and rust.\u00a0 The worst grade that is evident on the steel surface to be treated shall be recorded.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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GRADE A
<\/strong>Steel surface covered completely with adherent mill scale and with little if any rust.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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GRADE B<\/strong>
Steel surface, which has begun to rust and from which the mill scale has begun to flake.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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GRADE C<\/strong>
Steel surface on which the mill scale has rusted away or from which it can be scraped, but with little pitting visible to the naked eye.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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GRADE D<\/strong>
Steel surface on which the mill scale has rusted away and on which considerable pitting is visible to the naked eye.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Classes of Blast Cleaning as per AS 1627.4-2005<\/h2>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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The Australian Standard defines four classes of surface preparation achievable by abrasive blast\u00a0cleaning, identical to those described and pictured in AS 1627.9\u00a0(and as shown by the approximate examples below)<\/em>. The definitions are:<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Sa 1 \u00a0 \u00a0(Brush Blast)<\/strong>
Light blast cleaning.\u00a0 When viewed without magnification, the surface shall be free from visible oil, grease and dirt, and from poorly adhering mill scale, rust, paint coatings and foreign matter.\u00a0 The appearance corresponds to the prints designated Sa 1 in AS 1627.9.NOTE: Mill scale, rust or paint coating is considered to be poorly adhering if it can be removed by lifting with a blunt putty knife.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Sa 2 \u00a0 \u00a0(Commercial Blast)<\/em><\/strong>
Thorough blast cleaning.\u00a0 When viewed without magnification, the surface shall be free from visible oil, grease and dirt, and shall be free from most mill scale, rust, paint coatings and foreign matter.\u00a0 Any residual contamination shall be firmly adhering (see note to Sa 1).\u00a0 It corresponds to the appearance of the prints designated Sa 2 in AS 1627.9.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Sa 2\u00bd \u00a0 \u00a0(Near White Metal)<\/em><\/strong>
Very thorough blast cleaning.\u00a0 When viewed without magnification, the surface shall be free from visible oil, grease and dirt, and shall be free from mill scale, rust, paint coatings and foreign matter.\u00a0 Any remaining contamination shall show only as slight stains in the form of spots or stripes and correspond to the prints designated Sa 2\u00bd in AS 1627.9.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Sa 3 \u00a0 \u00a0(White Metal)<\/em><\/strong>
Blast cleaning to visually clean steel.\u00a0 When viewed without magnification, the surface shall be free from visible oil, grease and dirt, and shall be free from mill scale, rust, paint coating and foreign matter.\u00a0 It shall then have a uniform metallic colour and correspond to the prints designated Sa 3 in AS 1627.9.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Note: The images shown above are indicative only, for the abrasive blasting of Grade C rusted steel surfaces.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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\n\t\t\t\t\t\tCall Peter today for a quote or expert advice for your Abrasive Blasting or Industrial Coatings project
\nPhone : (07) 5589 9303 or (07) 5589 9746 Mobile 0429 468 631\t\t\t\t\t<\/div>\n\t\t\t\t\n\t\t\t\t\t\t\t\t\t
\n\t\t\t\t\t\n\t\t\t\t\t\te-mail now\t\t\t\t\t<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

Neumann Industrial Coatings in Currumbin adheres to AS 1627.4-2005 for all abrasive blasting operations at their facility.<\/p>\n","protected":false},"author":2,"featured_media":6007,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"site-sidebar-layout":"default","site-content-layout":"default","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"default","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""}},"footnotes":""},"categories":[14],"tags":[75,82,81],"acf":[],"_links":{"self":[{"href":"https:\/\/neumannindustrialcoatings.com.au\/wp-json\/wp\/v2\/posts\/2534"}],"collection":[{"href":"https:\/\/neumannindustrialcoatings.com.au\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/neumannindustrialcoatings.com.au\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/neumannindustrialcoatings.com.au\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/neumannindustrialcoatings.com.au\/wp-json\/wp\/v2\/comments?post=2534"}],"version-history":[{"count":0,"href":"https:\/\/neumannindustrialcoatings.com.au\/wp-json\/wp\/v2\/posts\/2534\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/neumannindustrialcoatings.com.au\/wp-json\/wp\/v2\/media\/6007"}],"wp:attachment":[{"href":"https:\/\/neumannindustrialcoatings.com.au\/wp-json\/wp\/v2\/media?parent=2534"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/neumannindustrialcoatings.com.au\/wp-json\/wp\/v2\/categories?post=2534"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/neumannindustrialcoatings.com.au\/wp-json\/wp\/v2\/tags?post=2534"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}