{"id":11715,"date":"2026-06-11T09:03:57","date_gmt":"2026-06-11T09:03:57","guid":{"rendered":"https:\/\/www.kscranegroup.com\/?post_type=posts&#038;p=11715"},"modified":"2026-06-11T09:04:01","modified_gmt":"2026-06-11T09:04:01","slug":"crane-global-coating-specifications","status":"publish","type":"posts","link":"https:\/\/www.kscranegroup.com\/tr\/posts\/crane-global-coating-specifications\/","title":{"rendered":"Global Coating Specifications of Bridge and Gantry Cranes Explored"},"content":{"rendered":"<div class=\"wp-block-rank-math-toc-block\" id=\"rank-math-toc\"><p>\u0130\u00e7indekiler<\/p><nav><ul><li><a href=\"#global-coating-specifications-for-cranes-a-comprehensive-overview-of-global-standards\">Global Coating Specifications for Cranes: A Comprehensive Overview of Global Standards<\/a><ul><li><a href=\"#iso-standard-system-iso-12944-8-2017\">ISO Standard System (ISO 12944-8:2017)<\/a><\/li><li><a href=\"#chinese-standards-gb-t-37400-12-2019-and-jt-t-733-2021\">Chinese Standards (GB\/T 37400.12-2019 and JT\/T 733-2021)<\/a><\/li><li><a href=\"#north-american-sspc-nace-asme-coating-standard-system\">North American SSPC\/NACE\/ASME Coating Standard System<\/a><\/li><li><a href=\"#japanese-standard-jis-k-5600-jis-k-5551-jis-k-5659\">Japanese Standard (JIS K 5600, JIS K 5551, JIS K 5659)<\/a><\/li><\/ul><\/li><li><a href=\"#from-standard-to-implementation-kuangshan-crane-customized-crane-coating-solutions\">From Standard to Implementation: KUANGSHAN CRANE Customized Crane Coating Solutions<\/a><\/li><li><a href=\"#faq\">SSS<\/a><\/li><\/ul><\/nav><\/div>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1448\" height=\"1086\" src=\"https:\/\/www.kscranegroup.com\/wp-content\/uploads\/2026\/06\/Global-Coating-Specifications-of-Bridge-and-Gantry-Cranes-Explored.png\" alt=\"\" class=\"wp-image-11716\"\/><\/figure>\n\n\n\n<p>Industrial machinery such as bridge and gantry cranes operate in industrial atmospheres, coastal high-salt fog, and even extreme marine environments. The coating protection system on their steel structures directly determines equipment service life and maintenance costs. A reasonable coating solution must be based on the correct standard system. Globally, the standards related to crane coating are numerous and complex:<\/p>\n\n\n\n<ul>\n<li>The <strong><a href=\"https:\/\/www.iso.org\/standard\/64833.html\" target=\"_blank\" rel=\"noopener\">ISO 12944<\/a><\/strong> series is the internationally recognized framework standard for anti-corrosion coating of steel structures.<\/li>\n\n\n\n<li>The European Union adopts EN ISO 12944 and combines it with the FEM crane industry standard.<\/li>\n\n\n\n<li>China has both <a href=\"https:\/\/openstd.samr.gov.cn\/bzgk\/std\/std_list?r=0.2675931030495039&amp;p.p1=2&amp;p.p2=30790&amp;p.p90=circulation_date&amp;p.p91=desc#\" target=\"_blank\" rel=\"noopener\">GB\/T 30790<\/a> (referencing ISO) and independently developed standards such as GB\/T 37400.12 and the industry-specific standard JT\/T 733.<\/li>\n\n\n\n<li>The United States operates with a coordinated system of SSPC (now part of AMPP), ASTM, and NACE.<\/li>\n\n\n\n<li>Japan&#8217;s JIS, Norway&#8217;s NORSOK, and Australia&#8217;s AS\/NZS also hold significant positions in their respective regional markets.<\/li>\n<\/ul>\n\n\n\n<p>This article takes ISO 12944 as its core anchor, systematically reviewing mainstream global <strong>global coating specifications<\/strong> systems to provide a comprehensive standard reference for coating design, selection, and acceptance in the crane industry.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"global-coating-specifications-for-cranes-a-comprehensive-overview-of-global-standards\">Global Coating Specifications for Cranes: A Comprehensive Overview of Global Standards<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"iso-standard-system-iso-12944-8-2017\">ISO Standard System (<a href=\"https:\/\/www.iso.org\/standard\/64838.html\" target=\"_blank\" rel=\"noopener\">ISO 12944-8:2017<\/a>)<\/h3>\n\n\n\n<p><strong>System Positioning:<\/strong> ISO 12944 is an international standard issued by the International Organization for Standardization for anti-corrosion coating systems for steel structures. It is applicable to structures exposed to different corrosive environments, covering the design, testing, and selection of coating systems. The standard specifies how to evaluate the corrosion resistance of coatings through salt spray testing, detailing the relationship between different corrosion protection levels and salt spray test durations. Worldwide, the ISO 12944 series is widely regarded as the foundational framework for anti-corrosion design of steel structures.<\/p>\n\n\n\n<p><strong>Applicable Scenarios:<\/strong> Global international bidding projects, Chinese-funded overseas general contracts, general overseas projects without mandatory local standards, and cross-border aid projects. It applies to most global projects.<\/p>\n\n\n\n<p><strong>Core Standard List:<\/strong><\/p>\n\n\n\n<ul>\n<li><a href=\"https:\/\/www.iso.org\/standard\/64833.html\" target=\"_blank\" rel=\"noopener\">ISO 12944<\/a>: Complete system for steel structure coating anti-corrosion (core master standard)<\/li>\n\n\n\n<li><a href=\"https:\/\/www.iso.org\/standard\/43426.html\" target=\"_blank\" rel=\"noopener\">ISO 8501-1<\/a>: Standard for determining the cleanliness of steel substrates (rust grades)<\/li>\n\n\n\n<li><a href=\"https:\/\/www.iso.org\/standard\/83009.html\" target=\"_blank\" rel=\"noopener\">ISO 8502<\/a><a href=\"https:\/\/www.iso.org\/search.html?PROD_isoorg_en%5Bquery%5D=8503\" target=\"_blank\" rel=\"noopener\">\/8503<\/a>: Standards for testing surface roughness and cleanliness<\/li>\n\n\n\n<li><a href=\"https:\/\/www.iso.org\/standard\/87301.html\" target=\"_blank\" rel=\"noopener\">ISO 9227<\/a>: Standard for salt spray corrosion testing and acceptance<\/li>\n\n\n\n<li><a href=\"https:\/\/www.iso.org\/search.html?PROD_isoorg_en%5Bquery%5D=4628\" target=\"_blank\" rel=\"noopener\">ISO 4628<\/a>: Standard for rating coating aging, cracking, and flaking<\/li>\n<\/ul>\n\n\n\n<p><strong>Detailed Mandatory Rules (ISO 12944):<\/strong><\/p>\n\n\n\n<ul>\n<li>Regarding the coating system, the standard requires the selection of a complete multi-layer coating system based on environmental corrosivity, including primer, intermediate coat, and topcoat. It emphasizes the compatibility between layers and overall performance matching. This is particularly important for cranes due to their complex structures and numerous welds requiring high coating continuity.<\/li>\n\n\n\n<li>In terms of anti-corrosion design, ISO 12944 establishes a unified framework through environmental classification (C1\u2013C5 and CX), defining different corrosive environments. For example, a port crane typically falls under the CX category (high salt fog and humidity), directly determining that the coating system must have long-term corrosion resistance.<\/li>\n\n\n\n<li>For coating thickness control, the standard, in conjunction with ISO 12944-5, introduces the concept of Nominal Dry Film Thickness (NDFT), requiring the maximum dry film thickness to be \u2264 3 times NDFT to prevent cracking and adhesion loss due to excessive local thickness. This design-oriented thickness system differs from simple numerical control, emphasizing the &#8220;coating thickness \u2013 service life&#8221; relationship.<\/li>\n\n\n\n<li>Regarding acceptance and quality control, ISO 12944-8 specifies that surface preparation must achieve Sa2.5 blast cleaning, and coating thickness and appearance defects must be systematically inspected. It recommends setting up Reference Areas as quality comparison benchmarks. If the specified grade is not met or the surface condition deteriorates before painting, rework is required. Defects like weld spatter, burrs, and sharp edges must be addressed before surface preparation.<\/li>\n\n\n\n<li>The ISO standard provides systematic requirements for the entire project process, from construction to acceptance, and is a widely accepted general technical specification in most countries and regions globally.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"chinese-standards-gb-t-37400-12-2019-and-jt-t-733-2021\">Chinese Standards (GB\/T <a href=\"https:\/\/openstd.samr.gov.cn\/bzgk\/std\/showGb?type=online&amp;hcno=E8FD383AD45C70562FF797271EB11216&amp;request_locale=zh\" target=\"_blank\" rel=\"noopener\">37400.12-2019<\/a> and JT\/T 733-2021)<\/h3>\n\n\n\n<p><strong>System Positioning:<\/strong><br>China&#8217;s crane coating field has formed a two-tier standard system: &#8220;manufacturing specification as the mainstay, industry-specific standard as a supplement.&#8221; GB\/T 37400.12-2019 is the general coating standard for heavy machinery, focusing on standardized coating construction and acceptance for factory manufacturing and normal working conditions. JT\/T 733-2021 is an industry-specific standard for port machinery, focusing on long-term anti-corrosion requirements for high-salt-fog, high-corrosion extreme environments. These are the core compliance benchmarks for domestic bridge and gantry cranes (general and port-specific).<\/p>\n\n\n\n<p><strong>Applicable Scenarios:<\/strong><\/p>\n\n\n\n<ul>\n<li><strong><a href=\"https:\/\/openstd.samr.gov.cn\/bzgk\/std\/showGb?type=online&amp;hcno=E8FD383AD45C70562FF797271EB11216&amp;request_locale=zh\" target=\"_blank\" rel=\"noopener\">GB\/T 37400.12-2019<\/a>:<\/strong> Applicable for factory coating, manufacturing acceptance, and routine quality control of domestic general heavy machinery, ordinary inland and normal working condition bridge and gantry cranes.<\/li>\n\n\n\n<li><strong>JT\/T 733-2021:<\/strong> Specifically applicable for coating design, construction, and performance acceptance of special equipment like port bridge and gantry cranes and port lifting machinery operating long-term in highly corrosive, salt-fog, and humid environments.<\/li>\n<\/ul>\n\n\n\n<p><strong>Core Standard List:<\/strong><\/p>\n\n\n\n<ul>\n<li><strong><a href=\"https:\/\/openstd.samr.gov.cn\/bzgk\/std\/showGb?type=online&amp;hcno=E8FD383AD45C70562FF797271EB11216&amp;request_locale=zh\" target=\"_blank\" rel=\"noopener\">GB\/T 37400.12-2019<\/a>:<\/strong> General technical conditions for heavy machinery \u2013 Painting. The foundation coating standard for bridge and gantry cranes, specifying coating selection, film thickness, and acceptance requirements.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/openstd.samr.gov.cn\/bzgk\/std\/newGbInfo?hcno=6BC8D52A103AFEE95AC318BEB5DC4EC8\" target=\"_blank\" rel=\"noopener\">GB\/T 8923.1-2011<\/a>:<\/strong> Rust grades and preparation grades of steel surfaces before application of paint. Core benchmark for determining the degree of cleaning.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/openstd.samr.gov.cn\/bzgk\/std\/std_list?p.p1=0&amp;p.p90=circulation_date&amp;p.p91=desc&amp;p.p2=30790\" target=\"_blank\" rel=\"noopener\">GB\/T 30790:<\/a><\/strong> Series of anti-corrosion coating standards for port machinery steel structures. General anti-corrosion specification for port equipment.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/openstd.samr.gov.cn\/bzgk\/std\/std_list?p.p1=0&amp;p.p90=circulation_date&amp;p.p91=desc&amp;p.p2=9286-1998\" target=\"_blank\" rel=\"noopener\">GB\/T 9286-1998<\/a>:<\/strong> Cross-cut test for paint films. Standard for testing coating adhesion.<\/li>\n\n\n\n<li><strong>JT\/T 733-2021:<\/strong> Technical conditions for anti-corrosion coating on steel structures of port machinery. The core standard dedicated to high-corrosion port working conditions.<\/li>\n\n\n\n<li><strong>JB\/T 4303-2017:<\/strong> Technical conditions for overhead traveling cranes. Specific coating process requirements for the bridge crane type.<\/li>\n<\/ul>\n\n\n\n<p><strong>Detailed Mandatory Rules:<\/strong><\/p>\n\n\n\n<p><strong>1. GB\/T 37400.12-2019 Core Technical Requirements<\/strong><\/p>\n\n\n\n<ul>\n<li><strong>Coating System Selection:<\/strong> The standard requires matching the coating system to the equipment&#8217;s operating environment. For normal working conditions, an epoxy primer + polyurethane topcoat combination is recommended. For heavy-duty anti-corrosion conditions, a zinc-rich primer system is preferred.<\/li>\n\n\n\n<li><strong>Dry Film Thickness Control:<\/strong> The standard specifies a total dry film thickness control range of 120\u03bcm\u2013300\u03bcm for the whole machine, mandating layer-by-layer construction and thickness control, suitable for standardized workshop manufacturing.<\/li>\n\n\n\n<li><strong>Finished Product Acceptance Standards:<\/strong> Acceptance is based on appearance, adhesion, and film thickness. Defects like runs, pinholes, and blistering are strictly prohibited. The acceptance rules are clear and easily implemented.<\/li>\n<\/ul>\n\n\n\n<p><strong>2. JT\/T 733-2021 Core Technical Requirements<\/strong><\/p>\n\n\n\n<ul>\n<li><strong>Heavy-Duty Anti-Corrosion Coating System:<\/strong> For port high-corrosion environments, a multi-layer heavy-duty anti-corrosion structure of zinc-rich primer + epoxy micaceous iron oxide intermediate coat + polyurethane topcoat is mandatory.<\/li>\n\n\n\n<li><strong>Long-Term Performance Verification:<\/strong> The standard emphasizes coating durability, requiring verification of anti-corrosion stability under extreme conditions through salt spray and humidity tests.<\/li>\n\n\n\n<li><strong>Increased Film Thickness and Service Life Requirements:<\/strong> It specifies a total dry film thickness of no less than 240\u03bcm for port machinery coatings to meet the demand for over 15 years of long-term anti-corrosion service.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"north-american-sspc-nace-asme-coating-standard-system\">North American SSPC\/NACE\/ASME Coating Standard System<\/h3>\n\n\n\n<p><strong>System Positioning:<\/strong> The North American crane coating standard system forms the official compliance benchmark for the U.S. market, with a clear division of labor and mature integration. SSPC (now part of AMPP) standardizes pre-treatment and on-site construction processes, while ASTM establishes standardized testing methods for coating performance. Together, they form the statutory basis for coating construction, quality inspection, market access, and acceptance liability for bridge and gantry cranes in North America. Its core feature is a closed-loop management of &#8220;process control + performance verification.&#8221;<\/p>\n\n\n\n<p><strong>Applicable Scenarios:<\/strong><br>Applicable to projects in the U.S., Canada, and those adopting North American industrial standards. It is the mandatory standard for coating construction, third-party inspection, and project delivery of bridge and gantry cranes in the North American region.<\/p>\n\n\n\n<p><strong>Core Standard List:<\/strong><\/p>\n\n\n\n<ul>\n<li>SSPC-SP10: Specification for Near-White Blast Cleaning<\/li>\n\n\n\n<li>ASTM D3359: Standard Test Method for Adhesion by Tape Test<\/li>\n\n\n\n<li>ASTM B117: Standard Practice for Operating Salt Spray (Fog) Apparatus<\/li>\n<\/ul>\n\n\n\n<p><strong>Detailed Mandatory Rules:<\/strong><\/p>\n\n\n\n<p><strong>SSPC Construction and Surface Preparation Mandatory Requirements<\/strong><\/p>\n\n\n\n<ul>\n<li><strong>Surface Preparation Grade:<\/strong> SSPC-SP10 specifies the near-white blast cleaning standard, requiring the thorough removal of most mill scale, rust, and contaminants from the steel surface to ensure stable adhesion between the coating and the substrate.<\/li>\n\n\n\n<li><strong>Environmental Control:<\/strong> SSPC guidelines mandate controlling environmental parameters like temperature, humidity, and dew point during coating operations, strictly regulating site conditions to ensure quality from the start.<\/li>\n<\/ul>\n\n\n\n<p><strong>ASTM Performance Testing Mandatory Requirements<\/strong><\/p>\n\n\n\n<ul>\n<li><strong>Adhesion Testing:<\/strong> Adhesion is quantitatively determined using the cross-cut test tape method per ASTM D3359 to verify if performance meets standards.<\/li>\n\n\n\n<li><strong>Corrosion Resistance Testing:<\/strong> Corrosion resistance and long-term durability are verified quantitatively using salt spray exposure per ASTM B117.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"japanese-standard-jis-k-5600-jis-k-5551-jis-k-5659\">Japanese Standard (JIS K 5600, JIS K 5551, JIS K 5659)<\/h3>\n\n\n\n<p><strong>System Positioning:<\/strong><br>The JIS K series coating standards are the general testing benchmarks for industrial coatings in Japan, established by the Japanese Ministry of Economy, Trade and Industry. They serve as a universal performance evaluation basis for coating systems on various steel structures, including cranes. This system does not directly govern construction processes or coating system selection but focuses on quantitative testing of coating properties, often used alongside design\/construction standards like ISO 12944.<\/p>\n\n\n\n<p><strong>Applicable Scenarios:<\/strong><br>Applicable to projects in Japan, overseas projects adopting the JIS system, and Sino-Japanese cooperative projects during coating performance testing and quality assessment for bridge and gantry cranes.<\/p>\n\n\n\n<p><strong>Core Standard List:<\/strong><\/p>\n\n\n\n<ul>\n<li>JIS K 5551: Standard for Primer Paints<\/li>\n\n\n\n<li>JIS K 5659: Standard for Topcoat Paints<\/li>\n\n\n\n<li>JIS K 5600: Fundamental Standard for Coating General Test Methods<\/li>\n<\/ul>\n\n\n\n<p><strong>Detailed Mandatory Rules<\/strong><\/p>\n\n\n\n<p><strong>Core Control Dimensions:<\/strong><br>JIS K 5600 is the core general testing standard, covering multiple test dimensions such as abrasion resistance, scratch hardness, chemical resistance, water resistance, cupping resistance, and washability. Some test methods are not covered by current ISO coating test standards, giving the JIS system a unique advantage.<\/p>\n\n\n\n<p><strong>Testing System Specifications:<\/strong><br>Each coating performance test has its own independent standard chapter, including core acceptance items like adhesion and corrosion resistance testing. The primary evaluation method is laboratory-based quantitative testing.<\/p>\n\n\n\n<p><strong>Engineering Application Rules:<\/strong><br>This system serves only as a material performance evaluation basis. It does not specify coating systems, construction processes, or film thickness parameters for actual engineering projects, which requires combination with general standards like ISO 12944.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"from-standard-to-implementation-kuangshan-crane-customized-crane-coating-solutions\">From Standard to Implementation: <a href=\"https:\/\/www.kscranegroup.com\/tr\/\">KUANGSHAN TURNA<\/a> Customized Crane Coating Solutions<\/h2>\n\n\n\n<p>Quality control during construction and acceptance per international standards directly determines a crane&#8217;s service life and lifecycle maintenance costs. No single paint type can meet all scenario protection needs. The key to a reliable long-term coating system is the compatibility matching of primer, intermediate coat, and topcoat, along with precise control of dry film thickness.<\/p>\n\n\n\n<p>With over 20 years of dedicated experience in crane design and manufacturing, KUANGSHANCRANE offers customized turnkey solutions, from paint selection and system design to construction technical guidance. We tailor solutions based on the specific usage scenario, corrosion protection grade, and budget to help customers build high-value, long-life crane protection systems.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"faq\">SSS<\/h2>\n\n\n\n<p><strong>Q: What is the most commonly used crane coating standard for international projects?<\/strong><br>A: For most international bridge and gantry crane projects, ISO 12944 is the most widely used anti-corrosion coating standard. It covers corrosion environment classification, coating system design, durability grades, surface preparation, and quality acceptance, serving as the default technical specification for many international tenders and overseas projects.<\/p>\n\n\n\n<p><strong>Q: Is it mandatory to follow local coating standards for exported crane projects?<\/strong><br>A: Not always. Most international projects specify the required standard in their tender documents or technical specifications. For example, European projects often require EN ISO 12944, US projects may require the SSPC\/AMPP system, while some Middle Eastern, African, and Southeast Asian projects directly adopt ISO 12944. If not specified, it&#8217;s recommended to confirm the plan with the client or a third-party inspection body.<\/p>\n\n\n\n<p><strong>Q: Is a thicker coating always better?<\/strong><br>A: Not necessarily. ISO 12944 emphasizes optimal film thickness, not excessive thickness. Excessively thick coatings can lead to cracking, blistering, poor adhesion, and delamination. The correct practice is to select the appropriate coating system and film thickness range based on the corrosivity category.<\/p>\n\n\n\n<p><strong>Q: Is field touch-up required after a crane leaves the factory?<\/strong><br>A: It depends on the service environment. Even with a heavy-duty anti-corrosion system, regular inspection of corners, weld areas, and bolted connections is recommended after long-term operation. Timely repair of local damage can significantly extend overall coating life.<\/p>","protected":false},"excerpt":{"rendered":"Industrial machinery such as bridge and gantry cranes operate in industrial atmospheres, coastal high-salt fog, and even extreme marine environments. The coating protection system on their steel structures directly determines equipment service life and maintenance costs. A reasonable coating solution must be based on the correct standard system. Globally, the standards related to crane coating [&hellip;]","protected":false},"featured_media":11716,"parent":0,"menu_order":0,"template":"single-SEO-Table.php","posts_category":[189],"posts_tag":[780,121],"acf":[],"_links":{"self":[{"href":"https:\/\/www.kscranegroup.com\/tr\/wp-json\/wp\/v2\/xmxposts\/11715"}],"collection":[{"href":"https:\/\/www.kscranegroup.com\/tr\/wp-json\/wp\/v2\/xmxposts"}],"about":[{"href":"https:\/\/www.kscranegroup.com\/tr\/wp-json\/wp\/v2\/types\/posts"}],"version-history":[{"count":3,"href":"https:\/\/www.kscranegroup.com\/tr\/wp-json\/wp\/v2\/xmxposts\/11715\/revisions"}],"predecessor-version":[{"id":11719,"href":"https:\/\/www.kscranegroup.com\/tr\/wp-json\/wp\/v2\/xmxposts\/11715\/revisions\/11719"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.kscranegroup.com\/tr\/wp-json\/wp\/v2\/media\/11716"}],"wp:attachment":[{"href":"https:\/\/www.kscranegroup.com\/tr\/wp-json\/wp\/v2\/media?parent=11715"}],"wp:term":[{"taxonomy":"posts_category","embeddable":true,"href":"https:\/\/www.kscranegroup.com\/tr\/wp-json\/wp\/v2\/posts_category?post=11715"},{"taxonomy":"posts_tag","embeddable":true,"href":"https:\/\/www.kscranegroup.com\/tr\/wp-json\/wp\/v2\/posts_tag?post=11715"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}