{"id":1813,"date":"2026-04-29T18:36:28","date_gmt":"2026-04-30T01:36:28","guid":{"rendered":"https:\/\/www.songhaiflanges.com\/?p=1813"},"modified":"2026-04-29T18:36:28","modified_gmt":"2026-04-30T01:36:28","slug":"industrial-flange-standards-explained-asme-en-hg-jis-gost-comparison-guide","status":"publish","type":"post","link":"https:\/\/www.songhaiflanges.com\/th\/industrial-flange-standards-explained-asme-en-hg-jis-gost-comparison-guide\/","title":{"rendered":"Industrial Flange Standards Explained: ASME, EN, HG, JIS, GOST Comparison Guide"},"content":{"rendered":"

Understanding Global Flange Standards<\/h2>\n

Flange standards ensure interchangeability, safety, and performance across piping systems worldwide. As a leading flange manufacturer exporting globally<\/strong>, Songhai produces flanges compliant with all major international standards. This guide helps you navigate the differences and select the right standard for your project.<\/p>\n

Major Flange Standards Overview<\/h2>\n

ASME B16.5 (USA\/International)<\/h3>\n

The most widely recognized flange standard globally, covering pipe flanges and flanged fittings from NPS \u00bd” to 24″.<\/p>\n

Key Features:<\/strong><\/p>\n

    \n
  • Pressure Classes:<\/strong> 150, 300, 400, 600, 900, 1500, 2500<\/li>\n
  • Flange Types:<\/strong> WN, SO, BL, SW, TH, LJ<\/li>\n
  • Materials:<\/strong> Carbon steel, stainless steel, alloy steel, duplex<\/li>\n
  • Temperature Range:<\/strong> -29\u00b0C to +595\u00b0C (depending on material)<\/li>\n
  • Face Types:<\/strong> RF, FF, RTJ, M\/F, T\/G<\/li>\n<\/ul>\n

    Common Applications:<\/strong><\/p>\n

      \n
    • Oil & gas pipelines<\/li>\n
    • Power generation<\/li>\n
    • Chemical processing<\/li>\n
    • International projects<\/li>\n<\/ul>\n

      Marking Requirements:<\/strong><\/p>\n

        \n
      • Manufacturer’s name or trademark<\/li>\n
      • Material designation<\/li>\n
      • Pressure class<\/li>\n
      • Size (NPS)<\/li>\n
      • Heat number or code<\/li>\n<\/ul>\n

        EN 1092-1 (Europe)<\/h3>\n

        European standard for steel flanges and their products, widely used in EU and countries following European norms.<\/p>\n

        Key Features:<\/strong><\/p>\n

          \n
        • Pressure Ratings:<\/strong> PN 2.5, 6, 10, 16, 25, 40, 63, 100<\/li>\n
        • Flange Types:<\/strong> Type 01-14 (covering all common types)<\/li>\n
        • DN Range:<\/strong> DN 10 to DN 4000<\/li>\n
        • Materials:<\/strong> P235GH to high-alloy steels<\/li>\n<\/ul>\n

          Type Designations:<\/strong><\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n
          Type<\/th>\nDescription<\/th>\n<\/tr>\n<\/thead>\n
          Type 01<\/td>\nPlate flange<\/td>\n<\/tr>\n
          Type 02<\/td>\nLoose plate flange<\/td>\n<\/tr>\n
          Type 04<\/td>\nLoose hubbed plate flange<\/td>\n<\/tr>\n
          Type 05<\/td>\nBlank flange<\/td>\n<\/tr>\n
          Type 11<\/td>\nWeld neck flange<\/td>\n<\/tr>\n
          Type 12<\/td>\nHubbed slip-on flange<\/td>\n<\/tr>\n
          Type 13<\/td>\nHubbed threaded flange<\/td>\n<\/tr>\n
          Type 21<\/td>\nIntegral flange<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

          Common Applications:<\/strong><\/p>\n

            \n
          • European industrial plants<\/li>\n
          • Water treatment facilities<\/li>\n
          • Food & beverage processing<\/li>\n
          • HVAC systems<\/li>\n<\/ul>\n

            HG\/T 20592-2009 (China)<\/h3>\n

            Chinese chemical industry standard for steel pipe flanges, widely used in domestic and Asian markets.<\/p>\n

            Key Features:<\/strong><\/p>\n

              \n
            • Pressure Ratings:<\/strong> PN 2.5, 6, 10, 16, 25, 40, 63, 100, 160<\/li>\n
            • Size Range:<\/strong> DN 10 to DN 2000<\/li>\n
            • Series:<\/strong> Series A (international) and Series B (domestic)<\/li>\n
            • Flange Types:<\/strong> PL, SO, WN, BL, SW, TH<\/li>\n<\/ul>\n

              Material Grades:<\/strong><\/p>\n

                \n
              • Carbon steel: Q235, 20#, 16Mn<\/li>\n
              • Stainless steel: 06Cr19Ni10 (304), 06Cr17Ni12Mo2 (316)<\/li>\n
              • Alloy steel: 15CrMo, 12Cr1MoV<\/li>\n<\/ul>\n

                Common Applications:<\/strong><\/p>\n

                  \n
                • Chinese domestic projects<\/li>\n
                • Chemical industry<\/li>\n
                • Petrochemical refineries<\/li>\n
                • Export to Asia\/Middle East<\/li>\n<\/ul>\n

                  JIS B2220 (Japan)<\/h3>\n

                  Japanese Industrial Standard for steel pipe flanges, commonly used in Japan and Southeast Asia.<\/p>\n

                  Key Features:<\/strong><\/p>\n

                    \n
                  • Pressure Classes:<\/strong> 5K, 10K, 16K, 20K, 30K, 40K, 63K<\/li>\n
                  • Size Range:<\/strong> 10A to 1500A<\/li>\n
                  • Flange Types:<\/strong> So, Wn, Bl, Sw, Th<\/li>\n<\/ul>\n

                    K Rating System:<\/strong><\/p>\n

                      \n
                    • 5K: Low pressure (similar to PN10)<\/li>\n
                    • 10K: Standard pressure (similar to PN16)<\/li>\n
                    • 16K-20K: Medium-high pressure<\/li>\n
                    • 30K-63K: High pressure applications<\/li>\n<\/ul>\n

                      Common Applications:<\/strong><\/p>\n

                        \n
                      • Japanese industrial facilities<\/li>\n
                      • Shipbuilding<\/li>\n
                      • Power plants<\/li>\n
                      • Semiconductor manufacturing<\/li>\n<\/ul>\n

                        GOST 33259-2015 (Russia\/CIS)<\/h3>\n

                        Russian national standard for steel flanges, used in Russia and Commonwealth of Independent States.<\/p>\n

                        Key Features:<\/strong><\/p>\n

                          \n
                        • Pressure Ratings:<\/strong> PN 0.1 to PN 200<\/li>\n
                        • Size Range:<\/strong> DN 10 to DN 2400<\/li>\n
                        • Flange Types:<\/strong> 1-13 (comprehensive coverage)<\/li>\n
                        • Execution:<\/strong> 1-7 (face types and configurations)<\/li>\n<\/ul>\n

                          Material Designations:<\/strong><\/p>\n

                            \n
                          • Carbon steel: St20, St25, 09G2S<\/li>\n
                          • Stainless: 12X18H10T (321), 10X17H13M2T (316Ti)<\/li>\n
                          • Alloy: 15X5M, 12X1MF<\/li>\n<\/ul>\n

                            Common Applications:<\/strong><\/p>\n

                              \n
                            • Russian oil & gas projects<\/li>\n
                            • CIS region infrastructure<\/li>\n
                            • Central heating systems<\/li>\n
                            • Heavy industry<\/li>\n<\/ul>\n

                              Standard Comparison Table<\/h2>\n\n\n\n\n\n\n\n\n\n
                              Feature<\/th>\nASME B16.5<\/th>\nEN 1092-1<\/th>\nHG\/T 20592<\/th>\nJIS B2220<\/th>\nGOST 33259<\/th>\n<\/tr>\n<\/thead>\n
                              Region<\/td>\nUSA\/Global<\/td>\nEurope<\/td>\nChina<\/td>\nJapan\/Asia<\/td>\nRussia\/CIS<\/td>\n<\/tr>\n
                              Pressure<\/td>\nClass 150-2500<\/td>\nPN 2.5-100<\/td>\nPN 2.5-160<\/td>\n5K-63K<\/td>\nPN 0.1-200<\/td>\n<\/tr>\n
                              Size Range<\/td>\n\u00bd”-24″<\/td>\nDN 10-4000<\/td>\nDN 10-2000<\/td>\n10A-1500A<\/td>\nDN 10-2400<\/td>\n<\/tr>\n
                              Temperature<\/td>\n-29\u00b0C to 595\u00b0C<\/td>\n-60\u00b0C to 550\u00b0C<\/td>\n-40\u00b0C to 550\u00b0C<\/td>\n-29\u00b0C to 550\u00b0C<\/td>\n-70\u00b0C to 650\u00b0C<\/td>\n<\/tr>\n
                              Bolt Pattern<\/td>\nImperial<\/td>\nMetric<\/td>\nMetric<\/td>\nMetric<\/td>\nMetric<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                              Pressure Class Equivalents<\/h2>\n\n\n\n\n\n\n\n\n\n\n
                              ASME Class<\/th>\nEN PN<\/th>\nHG PN<\/th>\nJIS K<\/th>\nGOST PN<\/th>\n<\/tr>\n<\/thead>\n
                              150<\/td>\nPN 20<\/td>\nPN 20<\/td>\n10,000<\/td>\nPN 20<\/td>\n<\/tr>\n
                              300<\/td>\nPN 50<\/td>\nPN 50<\/td>\n20,000<\/td>\nPN 50<\/td>\n<\/tr>\n
                              600<\/td>\nPN 110<\/td>\nPN 110<\/td>\n40K<\/td>\nPN 110<\/td>\n<\/tr>\n
                              900<\/td>\nPN 150<\/td>\nPN 150<\/td>\n–<\/td>\nPN 150<\/td>\n<\/tr>\n
                              1500<\/td>\nPN 260<\/td>\nPN 260<\/td>\n–<\/td>\nPN 260<\/td>\n<\/tr>\n
                              2500<\/td>\nPN 420<\/td>\nPN 420<\/td>\n–<\/td>\nPN 420<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                              Face Type Standards<\/h2>\n

                              Raised Face (RF)<\/h3>\n

                              Most common face type across all standards. Raised surface concentrates gasket pressure.<\/p>\n

                                \n
                              • ASME:<\/strong> 1.6mm (Class 150-300), 6.4mm (Class 400+)<\/li>\n
                              • EN:<\/strong> 2mm standard<\/li>\n
                              • HG:<\/strong> 2mm standard<\/li>\n<\/ul>\n

                                Flat Face (FF)<\/h3>\n

                                Full face gasket contact, used with cast iron and low-pressure applications.<\/p>\n

                                Ring Type Joint (RTJ)<\/h3>\n

                                Metal-to-metal seal for high-pressure\/high-temperature service.<\/p>\n

                                  \n
                                • ASME:<\/strong> R, RX, BX series rings<\/li>\n
                                • EN:<\/strong> Type K per EN 1092-1<\/li>\n<\/ul>\n

                                  Tongue and Groove (T\/G)<\/h3>\n

                                  Self-aligning faces for critical applications.<\/p>\n

                                  Dimensional Differences<\/h2>\n

                                  While standards aim for interchangeability, key differences exist:<\/p>\n

                                  Bolt Hole Diameter<\/h3>\n
                                    \n
                                  • ASME:<\/strong> Typically 1\/8″ larger than bolt diameter<\/li>\n
                                  • EN\/HG\/JIS\/GOST:<\/strong> 2mm larger than bolt diameter<\/li>\n<\/ul>\n

                                    Flange Thickness<\/h3>\n

                                    Varies between standards even for equivalent pressure ratings. Always verify dimensions when mixing standards.<\/p>\n

                                    Outside Diameter<\/h3>\n

                                    ASME and EN flanges may have different OD for same nominal size, affecting bolt circle compatibility.<\/p>\n

                                    Material Specifications by Standard<\/h2>\n

                                    ASME Material Grades<\/h3>\n
                                      \n
                                    • F304\/F304L – Austenitic stainless<\/li>\n
                                    • F316\/F316L – Molybdenum austenitic<\/li>\n
                                    • F321 – Titanium stabilized<\/li>\n
                                    • F51 – Duplex 2205<\/li>\n
                                    • F53 – Super duplex 2507<\/li>\n<\/ul>\n

                                      EN Material Numbers<\/h3>\n
                                        \n
                                      • 1.4301 – 304 equivalent<\/li>\n
                                      • 1.4307 – 304L equivalent<\/li>\n
                                      • 1.4401 – 316 equivalent<\/li>\n
                                      • 1.4404 – 316L equivalent<\/li>\n
                                      • 1.4462 – 2205 duplex<\/li>\n<\/ul>\n

                                        HG Material Grades<\/h3>\n
                                          \n
                                        • 06Cr19Ni10 – 304<\/li>\n
                                        • 06Cr17Ni12Mo2 – 316<\/li>\n
                                        • 022Cr19Ni10 – 304L<\/li>\n
                                        • 022Cr17Ni12Mo2 – 316L<\/li>\n<\/ul>\n

                                          Quality Control Requirements<\/h2>\n

                                          All standards require:<\/p>\n

                                            \n
                                          • Chemical Analysis:<\/strong> Verification of material composition<\/li>\n
                                          • Mechanical Testing:<\/strong> Tensile, yield, hardness<\/li>\n
                                          • Dimensional Inspection:<\/strong> 100% verification<\/li>\n
                                          • Marking:<\/strong> Permanent identification per standard<\/li>\n
                                          • Documentation:<\/strong> MTC\/certificate of conformity<\/li>\n<\/ul>\n

                                            Additional requirements for critical service:<\/p>\n

                                              \n
                                            • Non-destructive testing (PT, MT, UT, RT)<\/li>\n
                                            • Impact testing for low-temperature service<\/li>\n
                                            • PMI (Positive Material Identification)<\/li>\n
                                            • Third-party inspection<\/li>\n<\/ul>\n

                                              Songhai’s Multi-Standard Capability<\/h2>\n

                                              As an ISO 9001:2008 certified manufacturer with 30+ years experience, Songhai produces flanges to all major standards:<\/p>\n

                                                \n
                                              • ASME B16.5:<\/strong> Full range Class 150-2500<\/li>\n
                                              • EN 1092-1:<\/strong> PN 2.5-100, all types<\/li>\n
                                              • HG\/T 20592-2009:<\/strong> Series A & B<\/li>\n
                                              • JIS B2220:<\/strong> 5K-63K<\/li>\n
                                              • GOST 33259-2015:<\/strong> PN 0.1-200<\/li>\n
                                              • GB\/T 9112-2010:<\/strong> Chinese national standard<\/li>\n
                                              • NB\/T 47021-2012:<\/strong> Pressure vessel flanges<\/li>\n<\/ul>\n

                                                Standard Selection Guide<\/h2>\n

                                                Choose the right standard based on:<\/p>\n

                                                  \n
                                                1. Project Location:<\/strong> Follow local regulations and norms<\/li>\n
                                                2. Existing Infrastructure:<\/strong> Match existing piping systems<\/li>\n
                                                3. Client Requirements:<\/strong> Some EPC contractors specify standards<\/li>\n
                                                4. Industry Practice:<\/strong> Oil & gas often uses ASME, Europe uses EN<\/li>\n
                                                5. Availability:<\/strong> Consider local supplier capabilities<\/li>\n<\/ol>\n

                                                  Contact Songhai for Standard-Specific Flanges<\/h2>\n

                                                  Need flanges to specific international standards? Songhai offers:<\/p>\n

                                                    \n
                                                  • Free standard consultation<\/li>\n
                                                  • Cross-standard dimension verification<\/li>\n
                                                  • Complete certification packages<\/li>\n
                                                  • Fast delivery from stock or custom production<\/li>\n
                                                  • Competitive pricing FOB\/CIF worldwide<\/li>\n<\/ul>\n

                                                    Keywords: flange standards comparison, ASME B16.5, EN 1092-1, HG\/T 20592, JIS B2220, GOST 33259, international flange standards, pressure class conversion, flange dimensions, stainless steel flanges manufacturer<\/em><\/p>","protected":false},"excerpt":{"rendered":"

                                                    Industrial Flange Standards Explained: ASME, EN, HG, JIS, GOST Comparison Guide<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_kadence_starter_templates_imported_post":false,"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1813","post","type-post","status-publish","format-standard","hentry","category-3-news"],"_links":{"self":[{"href":"https:\/\/www.songhaiflanges.com\/th\/wp-json\/wp\/v2\/posts\/1813","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.songhaiflanges.com\/th\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.songhaiflanges.com\/th\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.songhaiflanges.com\/th\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.songhaiflanges.com\/th\/wp-json\/wp\/v2\/comments?post=1813"}],"version-history":[{"count":1,"href":"https:\/\/www.songhaiflanges.com\/th\/wp-json\/wp\/v2\/posts\/1813\/revisions"}],"predecessor-version":[{"id":1814,"href":"https:\/\/www.songhaiflanges.com\/th\/wp-json\/wp\/v2\/posts\/1813\/revisions\/1814"}],"wp:attachment":[{"href":"https:\/\/www.songhaiflanges.com\/th\/wp-json\/wp\/v2\/media?parent=1813"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.songhaiflanges.com\/th\/wp-json\/wp\/v2\/categories?post=1813"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.songhaiflanges.com\/th\/wp-json\/wp\/v2\/tags?post=1813"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}