Duplex steel pipe caps, also known as duplex stainless steel heads and super anti-corrosion pipeline plugs, are dedicated terminal sealing fittings for extreme working conditions involving high chloride ions, high salt spray, alternating ac
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Duplex steel pipe caps adopt an austenitic plus ferritic duplex metallographic structure, with material grades covering 2101, S31803, 2205 (S32205/F51), 2507 (S32750/F53), S32760, etc., and undergo solution annealing treatment. Specifications range from DN15 to DN2000, imperial 1/2″ to 48″, and can match SCH10S, SCH40S, SCH80S, SCH160S wall thicknesses as well as PN10–PN100, Class150–Class1500 pressure ratings, and comply with standards such as GB/T21832, ASTM A815, ASME SA815, EN, DIN, JIS, GOST, etc. They are mainly used for end capping, spare nozzle closure, and zone isolation of offshore platform pipelines, seawater desalination equipment, coastal chemical pipe networks, sour oil and gas transportation, desulfurization and denitrification environmental protection equipment, and brine and salt chemical pipelines. Before procurement, it is recommended to confirm the chloride ion concentration of the medium, hydrogen sulfide content, acid-base environment, diameter, wall thickness, pressure rating, and the required material grade; we will assist in matching solutions such as 2205 or 2507 accordingly.
| Product Name | Duplex Steel Pipe Cap |
| Product Category | Pipe Cap |
| The parameters of this series of duplex steel pipe caps strictly follow the authoritative international standards dedicated to duplex steel, adapting to the design and acceptance specifications of high-end corrosion engineering worldwide in marine, desulfurization, and salt chemical industries. Executive standards | GB/T21832, ASTM A815, ASME SA815, EN, DIN, JIS, GOST duplex stainless steel pipe fitting specifications. Mainstream materials: S32205 (2205/F51), S32750 (2507/F53), S31803 super duplex steel. Specification range: DN15–DN2000, 1/2″–48″ imperial inch diameter; anti-corrosion high-pressure wall thickness: SCH10S, SCH40S, SCH80S, SCH160S. Pressure rating: PN10–PN100, Class150–Class1500 full series. Working temperature range: -50℃ to 300℃, adapting to low temperature, normal temperature, medium-high temperature corrosion |
| Customization | Our factory possesses full-dimensional super anti-corrosion upgrading and special-shaped non-standard customization capabilities for duplex steel pipe caps, and can undertake various high-end customized orders worldwide involving marine, highly corrosive, and high-strength difficult cases. We support customization of non-standard anti-corrosion diameters, non-standard thickened high-pressure wall thicknesses, special anti-corrosion arc heights, extended sealing straight edges, eccentric special shapes, marine-grade reducing plugs, and other non-standard structures, adapting to scenarios such as technical transformation of old marine pipe networks, multi-standard mixed corrosive pipelines, and special-shaped port plugging of special anti-corrosion equipment. We support high-end material customization, including 2205 general duplex steel, 2507 super duplex steel, and S31803 high-purity duplex steel customized on demand, matching different levels of corrosive working conditions. We support high-end process upgrading, including precise solution annealing, non-magnetic treatment, sanitary-grade mirror polishing, marine-grade enhanced anti-corrosion treatment, fine |
| MOQ | Our factory's duplex steel pipe caps adopt a high-end special pipe fitting flexible minimum order mode, adapting to scenarios such as marine engineering replacement parts, desulfurization project small samples, sporadic replenishment for high-end corrosion engineering, and full-container batch supporting procurement. For the commonly used 2205/S32205 material in market engineering, DN15–DN600 mainstream diameters, and SCH40S standard anti-corrosion wall thickness general specifications, the MOQ is as low as 1 piece, |
| Lead Time | The factory has established a dedicated solution annealing production line and high-end constant-temperature warehousing for duplex steel, regularly stocking 2205 conventional mainstream specifications in spot inventory, and rapidly responding to delivery needs of high-end corrosion engineering projects worldwide in marine, desulfurization, and salt chemical industries. All duplex steel pipe caps in the market's general 2205/F51 material, conventional wall thickness, and standard sizes are in spot inventory, and within 24 hours after order confirmation, anti-corrosion re-inspection and cleanliness |
| Packaging | Duplex steel pipe caps adopt marine-grade high-end anti-corrosion clean protective packaging, specially designed for high-precision, highly anti-corrosive, marine-specific special pipe fittings, preventing transportation scratches, oxidation, contamination, and collision deformation, and ensuring that the factory anti-corrosion grade and cleanliness remain unchanged. Small DN15–DN100 precision pipe fittings are individually covered with food-grade dust-proof protective film, fully wrapped in independent thickened bubble film, and hard sealed plastic protective caps are installed at the ports to isolate salt, moisture, and dust, preventing surface contamination and local oxidation. Medium DN125–DN600 pipe caps are wholly wrapped in double-layer waterproof and rust-proof woven fabric, and custom anti-collision buffer soft pads are installed on curved surfaces to prevent scratching, deformation, and surface damage of precision curved structures. Large DN800–DN2000 extra-large diameter pipe fittings use fumigated solid wood pallets with multiple |
| Reference Price | Inquiry |
We adopt a flexible minimum order model. For general specifications with conventional 2205/S32205 material, DN15–DN600 mainstream diameters, and SCH40S standard anti-corrosion wall thickness, the MOQ is as low as 1 piece, suitable for marine engineering spare parts, desulfurization project samples, and sporadic replenishment; full-container batch matching procurement can also be undertaken. The factory has a dedicated solution annealing production line for duplex steel and constant-temperature warehousing, and regularly stocks conventional mainstream specifications of 2205 in stock. After order confirmation, anti-corrosion re-inspection and clean treatment are completed within 24 hours. Packaging is graded by diameter: small pipe fittings are fully wrapped with individual dust-proof film plus bubble film and equipped with port protective caps; medium-sized ones are covered with double-layer waterproof and rust-proof woven fabric and equipped with anti-collision buffer pads; large ones use fumigated solid wood pallets, steel strap reinforcement, and overall sealed waterproof wrapping. The pallets comply with international quarantine standards and can be directly cleared through customs across borders. All products are labeled and traceable by material, anti-corrosion grade, and specification, and are accompanied by Chinese-English material reports, intergranular corrosion test reports, and factory certificates of conformity. For specific delivery times and cross-border logistics arrangements, please provide dimensions, quantity, material, and destination, then contact us for confirmation.
Before sales, we provide anti-corrosion material selection, salt-fog grade matching, and corrosive working condition solution consulting. Based on chloride ion concentration, sulfide media, and acid-base environment, we assist in matching materials such as 2205 or 2507 to reduce service life risks caused by selection deviations. During sales, we synchronize forming, solution heat treatment, corrosion testing, clean protective packaging, and cross-border logistics progress, and can provide Chinese-English documents required for marine engineering acceptance, anti-corrosion testing, and customs clearance. After sales, we provide an 18-month international warranty. During the warranty period, for corrosion leakage, pitting cracking, substandard material, or process defects not caused by human installation errors, we provide free replacement and reissue and bear cross-border logistics losses. At the same time, we are equipped with a 24-hour special anti-corrosion pipe fittings team to provide marine pipeline welding guidance, anti-corrosion working condition optimization, and remote troubleshooting. In terms of customization, we can undertake structures such as non-standard diameters, thickened wall thickness, special arc height, extended sealing straight edges, eccentric special shapes, and reducing sealing plugs. We can also perform material customization, solution annealing, non-magnetic treatment, sanitary-grade mirror polishing, marine-grade enhanced anti-corrosion treatment, precision beveling finishing, laser marking, and customized packaging as needed.
Duplex steel has a two-phase structure of austenite and ferrite, with higher strength, and its resistance to chloride ion, salt spray, and sulfide corrosion is significantly better than 316L, making it more suitable for marine, high-chloride, and strong acid working conditions. Under such environments, 316L is prone to pitting corrosion and stress corrosion cracking, so its substitutability is limited.
2205 (S32205/F51) is suitable for conventional coastal, seawater desalination, and ordinary desulfurization working conditions, with higher cost-effectiveness; 2507 (S32750/F53) belongs to super duplex steel and is suitable for deep sea, high-sulfur oil and gas, and ultra-strong acid-base corrosion heavy-load working conditions. For specific selection, it is recommended to combine the chloride ion concentration of the medium, hydrogen sulfide content, and temperature, and contact us for confirmation.
Yes. All duplex steel pipe caps undergo solution annealing treatment to eliminate precipitated phases, stabilize the metallographic structure, and reduce the risk of intergranular corrosion cracking later.
Yes. General specifications of conventional 2205/S32205 material, DN15–DN600 mainstream nominal diameters, and SCH40S standard anti-corrosion wall thickness can be shipped from 1 piece, and we also undertake full-container batch matching. Mixed batches involve combinations of different materials, diameters, and wall thicknesses; please provide a list and contact us for confirmation.
Yes. We support structural customization such as non-standard anti-corrosion diameters, non-standard thickened high-pressure wall thickness, special anti-corrosion arc height, extended sealing straight edges, eccentric special shapes, and marine-grade reducing plugs, and also support customization of materials such as 2205, 2507, and S31803 as needed. Please provide drawings or dimensional parameters, and we will assist in confirming the solution.
Packaging provides graded protection according to diameter: small pipe fittings are individually wrapped in dust-proof film plus bubble wrap with added port protective caps; medium-sized items are covered with double-layer waterproof and rust-proof woven fabric plus added anti-collision cushioning pads; large items use fumigated solid wood pallets, steel strap reinforcement, and overall sealed waterproof wrapping. Accompanying documents include Chinese-English material reports, intergranular corrosion test reports, and factory certificates of conformity. The pallets comply with international quarantine standards and can be directly cleared through cross-border customs.
We provide an 18-month international warranty. During the warranty period, for corrosion leakage, pitting and cracking, substandard materials, or process defects not caused by human installation errors, we provide free replacement and reissue and bear cross-border logistics losses. We also provide marine pipeline welding guidance, anti-corrosion working condition optimization, and remote troubleshooting services.
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