{"id":4439,"date":"2026-08-20T03:31:33","date_gmt":"2026-08-20T03:31:33","guid":{"rendered":"https:\/\/www.wldsteel.com\/?p=4439"},"modified":"2026-08-20T03:31:35","modified_gmt":"2026-08-20T03:31:35","slug":"applicable-temperature-range-of-coal-tar-epoxy-anticorrosive-steel-pipe","status":"publish","type":"post","link":"https:\/\/www.wldsteel.com\/es\/applicable-temperature-range-of-coal-tar-epoxy-anticorrosive-steel-pipe\/","title":{"rendered":"Applicable Temperature Range Of Coal-Tar Epoxy Anticorrosive Steel Pipe"},"content":{"rendered":"

In accordance with SY\/T 0447\u20112014 Technical Standard for Epoxy Coal\u2011Tar Coating of Buried Steel Pipelines, combined with coating material mechanism, on\u2011site engineering practice and long\u2011term ageing law of anti\u2011corrosion coating, the applicable temperature range of coal\u2011tar epoxy anticorrosive steel pipe is defined precisely from four dimensions: long\u2011term operating temperature of conveyed medium, transient peak temperature, low\u2011temperature resistance of ambient environment and construction ambient temperature. These four indicators shall not be confused.<\/p>\n\n\n\n

First comes the long\u2011term operating temperature of medium conveyed inside the pipeline. The coal\u2011tar epoxy anti\u2011corrosion coating belongs to the epoxy\u2011modified coal\u2011tar pitch system. Its physical properties are significantly affected by temperature. The pitch component tends to soften and creep under high\u2011temperature conditions, and the adhesive force of cross\u2011linked resin structure decays. The standard clearly specifies that the temperature of medium conveyed for coal\u2011tar epoxy coating shall not exceed 80\u202f\u00b0C. Nevertheless, this value represents the maximum limit specified in the standard, rather than the recommended temperature for long\u2011term operation. From the perspective of anti\u2011corrosion durability, the long\u2011term continuous conveying medium temperature of the pipeline shall be controlled within the range of \u201130\u202f\u00b0C to 70\u202f\u00b0C. When the medium operates persistently between 70\u202f\u00b0C and 80\u202f\u00b0C, the anti\u2011corrosion coating will age rapidly, accompanied by softening, blistering and delamination of paint film. The bonding strength between glass\u2011fiber cloth and coating declines, and the anti\u2011corrosion insulation performance degrades, raising the corrosion risk of steel pipe. Therefore, the temperature range of 70\u201180\u202f\u00b0C can only serve as an emergency working condition for an extremely short period and must not be adopted for year\u2011round operation.<\/p>\n\n\n\n

The second parameter is transient peak temperature. Under infrequent and short\u2011duration working conditions, the coating can withstand a short\u2011term maximum temperature of 80\u202f\u00b0C. If the medium temperature quickly falls back below 70\u202f\u00b0C after short\u2011time high\u2011temperature exposure, no permanent damage will occur to the coating. Repeated cyclic impact of 80\u202f\u00b0C high temperature is strictly prohibited. Alternation between hot and cold will cause repeated expansion and contraction of the anti\u2011corrosion coating, resulting in fatigue cracks. Corrosive media and moisture may penetrate to the steel substrate along cracks and trigger coating failure.<\/p>\n\n\n\n

Thirdly, the low\u2011temperature resistance performance. Fully cured qualified coal\u2011tar epoxy anti\u2011corrosion coating features excellent low\u2011temperature toughness. When buried underground, it can endure a minimum ambient soil temperature of \u201130\u202f\u00b0C without easy cracking or peeling under frost heave in cold regions. This low\u2011temperature index refers to the finished coating\u2019s tolerance to surrounding soil temperature after burial, instead of the permissible temperature for on\u2011site painting construction.<\/p>\n\n\n\n

Finally, the ambient temperature for anti\u2011corrosion coating application. Coal\u2011tar epoxy paint is a two\u2011component chemically curable coating, and ambient temperature directly determines its curing reaction rate. The optimal construction temperature ranges from 10\u202f\u00b0C to 35\u202f\u00b0C for sufficient curing reaction and dense film formation. The minimum allowable construction ambient temperature is 5\u202f\u00b0C. Below 5\u202f\u00b0C, the curing reaction speed of epoxy resin drops sharply. The paint film remains uncured for a long time and is liable to absorb dust and moisture, which will lead to permanent defects in anti\u2011corrosion layer. Open\u2011air construction at low temperature is forbidden without heating and thermal\u2011insulation measures.<\/p>\n\n\n\n

For engineering selection, pipelines conveying hot\u2011water or thermal media at a persistent temperature above 70\u202f\u00b0C shall not adopt coal\u2011tar epoxy external anti\u2011corrosion. Alternative high\u2011temperature\u2011resistant anti\u2011corrosion systems such as 3\u2011layer polyethylene (3PE) or fusion\u2011bonded epoxy powder shall be selected to guarantee the designed service life of pipelines.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

<\/p>","protected":false},"excerpt":{"rendered":"

In accordance with SY\/T 0447\u20112014 Technical Standard for Epoxy Coal\u2011Tar Coating of Buried Steel Pipelines, combined with coating material mechanism, on\u2011site engineering practice and long\u2011term ageing law of anti\u2011corrosion coating, the applicable temperature range of coal\u2011tar epoxy anticorrosive steel pipe is defined precisely from four dimensions: long\u2011term operating temperature of conveyed medium, transient peak temperature, […]<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[1],"tags":[],"yoast_head":"\nApplicable Temperature Range Of Coal-Tar Epoxy Anticorrosive Steel Pipe - 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\/es\/applicable-temperature-range-of-coal-tar-epoxy-anticorrosive-steel-pipe\/\" \/>\n<meta property=\"og:locale\" content=\"es_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Applicable Temperature Range Of Coal-Tar Epoxy Anticorrosive Steel Pipe - 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