{"id":18657,"date":"2026-05-25T00:38:22","date_gmt":"2026-05-25T00:38:22","guid":{"rendered":"https:\/\/oudianvalve.com\/?post_type=product&p=18657"},"modified":"2026-05-25T01:08:10","modified_gmt":"2026-05-25T01:08:10","slug":"904l-globe-valves-din-3356-dn125-pn16","status":"publish","type":"product","link":"https:\/\/oudianvalve.com\/it\/products\/globe-valves\/904l-globe-valves-din-3356-dn125-pn16\/","title":{"rendered":"904L Globe Valves,DIN 3356,DN125,PN16"},"content":{"rendered":"

904L Globe Valve (Super Austenitic Stainless Steel)<\/h1>\n
<\/div>\n
904L (UNS N08904 \/ EN 1.4539 \/ ASTM A182 F904L)<\/strong> is a high-alloy, ultra-low-carbon super austenitic stainless steel \u2014 designed for extreme corrosion resistance, especially in reducing acids and chloride environments. Below is full technical data, features, specs, and comparison.<\/div>\n

\ud83e\uddf1 Material Core Properties<\/h2>\n
    \n
  • Composition<\/strong>: 19\u201323%Cr + 23\u201328%Ni + 4\u20135%Mo + 1\u20132%Cu + C\u22640.02%<\/li>\n
  • Strength<\/strong>: Tensile \u2265490 MPa; Yield \u2265215 MPa \u2014 lower strength than duplex 2507, but far better corrosion resistance in reducing media<\/strong><\/li>\n
  • Resistenza alla corrosione<\/strong>:\n
    <\/div>\n

    \u2705 Excellent in dilute sulfuric acid, phosphoric acid, organic acids (acetic\/formic), alkalis, seawater, brine<\/strong><\/p>\n

    <\/div>\n

    \u2705 Superior resistance to pitting, crevice corrosion, and stress corrosion cracking (SCC) vs 316L\/317L<\/p>\n

    <\/div>\n

    \u274c Not suitable for strong oxidizing acids (e.g., concentrated nitric acid) \u2014 worse than 316L here<\/li>\n

  • Temperature<\/strong>: Stable from -196\u00b0C up to 400\u00b0C<\/strong>; no brittleness; fully austenitic, non-magnetic<\/li>\n
  • Caratteristiche<\/strong>: Excellent weldability & formability; no post-weld heat treatment needed<\/li>\n<\/ul>\n
    \n
    <\/div>\n

    \u2699\ufe0f Main Specifications<\/h2>\n
    <\/div>\n

    \u2705 Design Standards<\/h3>\n
      \n
    • Design: API 600, API 6D, ASME B16.34, EN 12516<\/strong><\/li>\n
    • Dimensions: ASME B16.10 \/ B16.5, EN 558<\/li>\n
    • Test: API 598, EN 12266<\/strong>; NACE MR0175 optional<\/li>\n<\/ul>\n
      <\/div>\n

      \u2705 Size & Pressure<\/h3>\n
      <\/div>\n
        \n
      • Size: DN15\u2013DN600 (NPS \u00bd\u2033\u201324\u2033)<\/strong><\/li>\n
      • Pressure: Class 150\u20131500 \/ PN16\u2013PN100<\/strong><\/li>\n
      • Temperature: -50\u00b0C ~ +380\u00b0C<\/strong> (continuous); max 400\u00b0C short-term<\/li>\n<\/ul>\n

        \u2705 Structure & Type<\/h3>\n
          \n
        • Model: J41W (straight-through), J44W (angle), J45W (Y-type)<\/strong><\/li>\n
        • Bonnet: Bolted bonnet (BB), pressure-seal bonnet (high pressure)<\/li>\n
        • Stem: Outside Screw & Yoke (OS&Y) or inside screw<\/li>\n
        • Seal: Metal-to-metal; hardfaced (Stellite) or solid 904L disc\/seat<\/li>\n
        • Connection: Flange RF\/RTJ, Butt Weld, Socket Weld<\/strong><\/li>\n<\/ul>\n

          \u2705 Standard Material List<\/h3>\n\n\n\n\n\n\n\n\n\n
          Part<\/th>\nMateriale<\/th>\n<\/tr>\n<\/thead>\n
          Body \/ Bonnet \/ Disc \/ Seat<\/td>\n904L \/ UNS N08904 \/ 1.4539<\/strong><\/td>\n<\/tr>\n
          Stelo<\/td>\n904L \/ Alloy 625 (high strength)<\/td>\n<\/tr>\n
          Packing<\/td>\nPTFE, graphite, or high-temperature fiber<\/td>\n<\/tr>\n
          Gasket<\/td>\nSpiral wound (graphite + 904L ring)<\/td>\n<\/tr>\n
          Fasteners<\/td>\nAlloy 20 \/ Hastelloy C4 (to avoid galvanic corrosion)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

          Key Advantages<\/h2>\n
          <\/div>\n
            \n
          1. Best for Reducing Acids<\/strong>: #1 choice for dilute sulfuric acid (<10%, <40\u00b0C) \u2014 outperforms 2205\/2507\/Alloy 20 here<\/li>\n
          2. Superior Chloride Resistance<\/strong>: Resists seawater, brine, salt solutions; better than 316L\/317L, close to 6Mo<\/li>\n
          3. Precise Flow Control<\/strong>: Globe valve design \u2014 ideal for throttling, regulation, and frequent adjustment<\/strong> (far better than gate valve)<\/li>\n
          4. Zero Leakage<\/strong>: Tight sealing; suitable for toxic\/valuable media<\/li>\n
          5. Long Service Life<\/strong>: 4\u20136x longer than 316L; low maintenance<\/li>\n
          6. Weld-Friendly<\/strong>: Low carbon \u2192 no intergranular corrosion after welding<\/li>\n<\/ol>\n

            Typical Applications<\/h2>\n
            <\/div>\n
              \n
            • \u2705 Chemical<\/strong>: Sulfuric acid, phosphoric acid, acetic acid, formic acid, bleaching solutions<\/li>\n
            • \u2705 Petrochemical<\/strong>: Refining, alkylation units, acid regeneration<\/li>\n
            • \u2705 Desalination<\/strong>: SWRO, brine systems, high-salinity water<\/li>\n
            • \u2705 Marine<\/strong>: Seawater cooling, offshore platforms, saltwater pipelines<\/li>\n
            • \u2705 Pulp & Paper<\/strong>: Bleach plants, chemical recovery<\/li>\n
            • \u2705 Pharmaceutical \/ Food<\/strong>: High-purity corrosive processes<\/li>\n
            • \u2705 Pollution Control<\/strong>: Flue gas scrubbing, waste acid treatment<\/li>\n<\/ul>\n

              Comparison: 904L vs 2507 vs Alloy 20 vs 316L<\/strong><\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n
              Item<\/th>\n316L<\/th>\nAlloy 20<\/th>\n904L<\/strong><\/th>\n2507 Duplex<\/th>\n<\/tr>\n<\/thead>\n
              Structure<\/td>\nAustenitic<\/td>\nAustenitic<\/td>\nSuper Austenitic<\/strong><\/td>\nDual-Phase<\/td>\n<\/tr>\n
              Strength<\/td>\nMedio<\/td>\nMedio<\/td>\nMedio<\/strong><\/td>\nVery High<\/strong><\/td>\n<\/tr>\n
              Sulfuric Acid<\/td>\nPoor<\/td>\nGood<\/td>\nExcellent<\/strong><\/td>\nGood<\/td>\n<\/tr>\n
              Chloride Resistance<\/td>\nBasso<\/td>\nAlto<\/td>\nVery High<\/strong><\/td>\nExcellent<\/strong><\/td>\n<\/tr>\n
              Max Temp<\/td>\n450\u00b0C<\/td>\n400\u00b0C<\/td>\n380\u00b0C<\/strong><\/td>\n320\u00b0C<\/td>\n<\/tr>\n
              Sour Service<\/td>\nNo<\/td>\nLimited<\/td>\nGood<\/td>\nBest<\/strong><\/td>\n<\/tr>\n
              Costo<\/td>\nBasso<\/td>\nAlto<\/td>\nAlto<\/strong><\/td>\nVery High<\/strong><\/td>\n<\/tr>\n
              Miglior utilizzo<\/td>\nGeneral<\/td>\nMixed acids<\/td>\nReducing acids + chloride<\/strong><\/td>\nHigh pressure + severe corrosion<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

              Quick Selection Rule<\/h3>\n
              <\/div>\n
                \n
              • Choose 904L<\/strong> = dilute sulfuric, organic acids, seawater, need good formability\/weldability<\/li>\n
              • Choose 2507<\/strong> = high pressure, sour gas, high chloride, higher strength needed<\/li>\n
              • Choose Alloy 20<\/strong> = sulfuric acid at higher concentrations\/temperatures<\/li>\n<\/ul>\n

                Installation & Operation Notes<\/h2>\n
                <\/div>\n
                  \n
                1. Galvanic Isolation<\/strong>: Never connect directly to carbon steel; use gaskets\/insulation to avoid corrosion<\/li>\n
                2. Welding<\/strong>: Use matching filler (ER385); no post-weld heat treatment required<\/li>\n
                3. Operazione<\/strong>: Perfect for regulation\/throttling<\/strong>; can be used for frequent opening\/closing<\/li>\n
                4. Cleaning<\/strong>: No carbon steel tools\/wire brushes; avoid iron contamination<\/li>\n
                5. Limit<\/strong>: Do NOT use in concentrated nitric acid or strong oxidizers
                  \n

                  FAQ: 904L Globe Valve<\/h1>\n
                  <\/div>\n
                  Complete frequently asked questions covering material, performance, selection, installation, operation, maintenance, and comparison \u2014 tailored for engineering, procurement, and on-site use.<\/div>\n
                  <\/div>\n
                  \n
                  <\/div>\n

                  \u00a0Material & Basic Properties<\/h2>\n
                  <\/div>\n
                  Q1: What is 904L? What does UNS N08904 \/ 1.4539 mean?<\/strong><\/div>\n
                  <\/div>\n
                  \n
                  A:<\/strong> 904L is a super-austenitic stainless steel<\/strong> with ultra-low carbon content (C \u2264 0.02%).<\/div>\n
                  <\/div>\n
                    \n
                  • UNS N08904 = Unified Numbering System standard<\/li>\n
                  • 1.4539 = European (EN) material number<\/li>\n
                  • Composition: 20%Cr, 25%Ni, 4.5%Mo, 1.5%Cu<\/li>\n
                  • Copper addition gives excellent resistance to reducing acids<\/strong> \u2014 its unique advantage.<\/li>\n<\/ul>\n
                    <\/div>\n<\/blockquote>\n
                    <\/div>\n
                    Q2: Why choose 904L instead of 316L, 317L, or Duplex 2205\/2507?<\/strong><\/div>\n
                    <\/div>\n
                    \n
                    A:<\/strong><\/div>\n
                    <\/div>\n
                      \n
                    • \u2705 vs 316L\/317L: 3\u20135x better corrosion resistance<\/strong>, especially in dilute sulfuric, phosphoric, and organic acids<\/li>\n
                    • \u2705 vs 2205\/2507: Far better performance in reducing acids<\/strong> (duplex alloys fail rapidly here); better formability & weldability<\/li>\n
                    • \u2705 vs Alloy 20: Similar acid resistance, but better thermal stability and less risk of intergranular corrosion\n
                      <\/div>\n

                      \u2705 Best use case:<\/strong> Reducing acids + chlorides + need for good fabrication properties<\/li>\n<\/ul>\n

                      <\/div>\n<\/blockquote>\n
                      <\/div>\n
                      Q3: Is 904L magnetic?<\/strong><\/div>\n
                      <\/div>\n
                      \n
                      A:<\/strong> No.<\/strong> It is fully austenitic \u2014 non-magnetic in all conditions, even after cold working or welding.<\/div>\n
                      <\/div>\n<\/blockquote>\n
                      <\/div>\n
                      Q4: What is the temperature and pressure limit?<\/strong><\/div>\n
                      <\/div>\n
                      \n
                      A:<\/strong><\/div>\n
                      <\/div>\n
                        \n
                      • Temperature: -50\u00b0C ~ +380\u00b0C<\/strong> continuous; max 400\u00b0C short-term<\/li>\n
                      • Pressure: Standard Class 150 \u2013 1500 \/ PN16 \u2013 PN100<\/strong><\/li>\n
                      • Nota:<\/em> Strength is lower than duplex; for >Class 600, verify wall thickness design.<\/li>\n<\/ul>\n
                        <\/div>\n<\/blockquote>\n
                        <\/div>\n
                        Q5: Does 904L resist seawater and chlorides?<\/strong><\/div>\n
                        <\/div>\n
                        \n
                        \n

                        A:<\/strong> Yes, very good<\/strong> \u2014 better than 316L\/317L, good for brackish water, brine, and low-to-medium velocity seawater.<\/p>\n

                        <\/div>\n

                        \u274c Limit:<\/em> Not recommended for high-velocity pure seawater (>2m\/s) or hot brine (>60\u00b0C) \u2014 use 2507 \/ 254 SMO<\/strong> instead.<\/p>\n<\/div>\n

                        <\/div>\n<\/blockquote>\n
                        <\/div>\n
                        Q6: What media is 904L NOT suitable for?<\/strong><\/div>\n
                        <\/div>\n
                        \n
                        \n

                        A:<\/strong><\/p>\n

                        <\/div>\n

                        \u274c Concentrated nitric acid, strong oxidizing media (worse than 316L)<\/p>\n

                        <\/div>\n

                        \u274c Hydrofluoric acid, fluorides<\/p>\n

                        <\/div>\n

                        \u274c Hot concentrated caustic (>120\u00b0C)<\/p>\n

                        <\/div>\n

                        \u274c Media containing free sulfur trioxide<\/p>\n<\/div>\n

                        <\/div>\n<\/blockquote>\n
                        <\/div>\n
                        \n
                        <\/div>\n

                        \u00a0Design & Technical Specification<\/h2>\n
                        <\/div>\n
                        Q7: What are the standard design codes for 904L globe valves?<\/strong><\/div>\n
                        <\/div>\n
                        \n
                        A:<\/strong><\/div>\n
                        <\/div>\n
                          \n
                        • Design: API 600, ASME B16.34, EN 12516<\/strong><\/li>\n
                        • Face-to-face: ASME B16.10, EN 558<\/strong><\/li>\n
                        • Flange: ASME B16.5, ASME B16.47, HG\/T20592<\/strong><\/li>\n
                        • Test & Inspection: API 598, EN 12266<\/strong><\/li>\n
                        • Material: ASTM A182 F904L, ASTM A351 CK3MCuN<\/strong><\/li>\n<\/ul>\n
                          <\/div>\n<\/blockquote>\n
                          <\/div>\n
                          Q8: What are the common model numbers?<\/strong><\/div>\n
                          <\/div>\n
                          \n
                          A:<\/strong><\/div>\n
                          <\/div>\n
                            \n
                          • J41W<\/strong>: Straight-through globe valve, flange connection<\/li>\n
                          • J44W<\/strong>: Angle-type globe valve<\/li>\n
                          • J45W<\/strong>: Y-type globe valve (lower pressure drop)<\/li>\n
                          • Suffix meaning:<\/em> W = all metal seal; Y = Stellite hardfaced; PTFE\/Graphite for soft seal<\/li>\n<\/ul>\n<\/blockquote>\n<\/li>\n<\/ol>","protected":false},"excerpt":{"rendered":"

                            DIN 3356 904L Globe Valve ,China 904L Globe Valve Manufacture, DN125 904L Globe Valve ,PN16 904L Globe Valve<\/p>","protected":false},"featured_media":18658,"template":"","meta":{"advanced_seo_description":"","jetpack_seo_html_title":"","jetpack_seo_noindex":false},"product_brand":[],"product_cat":[80],"product_tag":[715,714,716,717],"class_list":{"0":"post-18657","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-globe-valves","7":"product_tag-china-904l-globe-valve-manufacture","8":"product_tag-din-3356-904l-globe-valve","9":"product_tag-dn125-904l-globe-valve","10":"product_tag-pn16-904l-globe-valve","12":"first","13":"instock","14":"shipping-taxable","15":"product-type-simple"},"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/oudianvalve.com\/it\/wp-json\/wp\/v2\/product\/18657","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/oudianvalve.com\/it\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/oudianvalve.com\/it\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/oudianvalve.com\/it\/wp-json\/wp\/v2\/media\/18658"}],"wp:attachment":[{"href":"https:\/\/oudianvalve.com\/it\/wp-json\/wp\/v2\/media?parent=18657"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/oudianvalve.com\/it\/wp-json\/wp\/v2\/product_brand?post=18657"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/oudianvalve.com\/it\/wp-json\/wp\/v2\/product_cat?post=18657"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/oudianvalve.com\/it\/wp-json\/wp\/v2\/product_tag?post=18657"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}