{"id":4435,"date":"2026-07-28T06:13:50","date_gmt":"2026-07-28T06:13:50","guid":{"rendered":"https:\/\/www.wldsteel.com\/?p=4435"},"modified":"2026-07-28T06:13:52","modified_gmt":"2026-07-28T06:13:52","slug":"classification-of-coal-tar-epoxy-anti-corrosion-steel-pipes","status":"publish","type":"post","link":"https:\/\/www.wldsteel.com\/ko\/classification-of-coal-tar-epoxy-anti-corrosion-steel-pipes\/","title":{"rendered":"\uc11d\ud0c4 \ud0c0\ub974 \uc5d0\ud3ed\uc2dc \ub0b4\uc2dd\uc131 \uac15\uad00\uc758 \ubd84\ub958"},"content":{"rendered":"<p class=\"wp-block-paragraph\">The anti-corrosion system complies with SY\/T 0447-2014 Specification for Epoxy Coal Tar Anti-Corrosive Coating of Buried Steel Pipelines. Classification is mainly based on anti-corrosion structural grade, together with other grouping methods as below.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Classified by Anti-Corrosion Structure (Most Widely Adopted in Engineering)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ordinary Grade: One Coat &amp; One Cloth<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Structure: 1 primer coat + 1 topcoat + 1 layer of glass fiber cloth + 1 topcoat<br>Minimum total dry film thickness: 0.3 mm<br>Application: Dry soil with mild corrosion, temporary pipelines, drainage branch pipelines<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Reinforced Grade: Three Coats &amp; Two Cloths (Market Mainstream)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Structure: Primer \u2192 Topcoat \u2192 Glass Fiber Cloth \u2192 Topcoat \u2192 Glass Fiber Cloth \u2192 Topcoat<br>Minimum total dry film thickness: 0.4 mm<br>Application: Buried steel pipelines under general soil conditions, sewage pipelines, rainwater pipelines<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Extra Reinforced Grade: Five Coats &amp; Three Cloths<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Structure: Primer \u2192 Topcoat \u2192 Glass Fiber Cloth \u2192 Topcoat \u2192 Glass Fiber Cloth \u2192 Topcoat \u2192 Glass Fiber Cloth \u2192 Topcoat<br>Minimum total dry film thickness: 0.6 mm<br>Application: Humid soil, silt, saline-alkali land, areas with abundant groundwater and strong corrosiveness<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Classified by Construction Mode<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Factory Prefabricated Coal Tar Epoxy Anti-Corrosion Steel Pipe<br>Sand blasting and derusting, mechanized coating and winding completed in workshop. Stable quality, suitable for mass engineering orders.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">On-site Manual Coating &amp; Winding Anti-Corrosion<br>Construction implemented after pipeline laying, mainly used for weld joint repair and renovation projects. Quality fluctuates greatly due to manual operation.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Classified by Anti-Corrosion Position<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Outer Wall Only Anti-Corrosion (Most Common Solution)<br>The outer wall is protected against soil corrosion while the inner wall remains untreated. Widely used for sewage, rainwater and oil transmission pipelines.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Inner &amp; Outer Wall Coal Tar Epoxy Anti-Corrosion Steel Pipe<br>Both inner and outer surfaces are coated with coal tar epoxy paint.<br>Not allowed for drinking water pipelines\u00a0(the coating contains toxic asphalt ingredients). Only applicable for sewage and industrial wastewater delivery.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Supplementary Technical Notes<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Base pipe material: Seamless steel pipe, spiral welded pipe and straight seam welded pipe are all available for coal tar epoxy anti-corrosion treatment.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Limitations: The coating turns brittle under low temperature. Its service life under long-term immersion and high saline-alkali environment is shorter than 3PE coating. Usage is gradually restricted in regions with strict environmental regulations.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Applicable media: Sewage, rainwater, non-potable industrial water, buried oil pipelines. Not suitable for tap water supply pipelines.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Quick Selection Guide<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Dry ordinary soil \u2192 Reinforced Grade (Three Coats &amp; Two Cloths)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Silt, swamp, saline-alkali land \u2192 Extra Reinforced Grade (Five Coats &amp; Three Cloths)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Temporary simple pipelines \u2192 Ordinary Grade (One Coat &amp; One Cloth)<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.wldsteel.com\/wp-content\/uploads\/2026\/07\/Epoxy-Coal-Tar-Anti-Corrosion-Steel-Pipe.png\" alt=\"\" class=\"wp-image-4436\" width=\"334\" height=\"425\" srcset=\"https:\/\/www.wldsteel.com\/wp-content\/uploads\/2026\/07\/Epoxy-Coal-Tar-Anti-Corrosion-Steel-Pipe.png 420w, https:\/\/www.wldsteel.com\/wp-content\/uploads\/2026\/07\/Epoxy-Coal-Tar-Anti-Corrosion-Steel-Pipe-236x300.png 236w, https:\/\/www.wldsteel.com\/wp-content\/uploads\/2026\/07\/Epoxy-Coal-Tar-Anti-Corrosion-Steel-Pipe-9x12.png 9w\" sizes=\"auto, (max-width: 334px) 100vw, 334px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>","protected":false},"excerpt":{"rendered":"<p>The anti-corrosion system complies with SY\/T 0447-2014 Specification for Epoxy Coal Tar Anti-Corrosive Coating of Buried Steel Pipelines. Classification is mainly based on anti-corrosion structural grade, together with other grouping methods as below. Classified by Anti-Corrosion Structure (Most Widely Adopted in Engineering) Ordinary Grade: One Coat &amp; One Cloth Structure: 1 primer coat + 1 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-4435","post","type-post","status-publish","format-standard","hentry","category-news"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Classification of Coal Tar Epoxy Anti-Corrosion Steel Pipes - API steel oilfield pipeline, casing pipe, OCTG manufacturer and supplier<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wldsteel.com\/ko\/classification-of-coal-tar-epoxy-anti-corrosion-steel-pipes\/\" \/>\n<meta property=\"og:locale\" content=\"ko_KR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Classification of Coal Tar Epoxy Anti-Corrosion Steel Pipes - API steel oilfield pipeline, casing pipe, OCTG manufacturer and supplier\" \/>\n<meta property=\"og:description\" content=\"The anti-corrosion system complies with SY\/T 0447-2014 Specification for Epoxy Coal Tar Anti-Corrosive Coating of Buried Steel Pipelines. Classification is mainly based on anti-corrosion structural grade, together with other grouping methods as below. 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