Nickel-based alloy lap joint stub end
Nickel-based alloy lap joint stub ends are a type of special lap joint flange pipe fitting, formed from nickel-based alloy pipe blanks or plates, with one end being a butt-weld bevel for fusion welding to pipe of the same material, and the other end being solution-treated and finish-turned to form a flat lap joint surface, which can be rotationally aligned with a backing flange. We routinely stock Hastelloy, Monel, Inconel, and Incoloy series materials, covering both LP long-type and SP short-type configurations, with manufacturing referencing standards such as GB/T12459, ASME B16.9, MSS SP43, and ASTM SB366. The products are used in highly corrosive, ultra-high-temperature, high-purity sterile, or high-radiation pipelines where stainless steel, duplex steel, and alloy steel cannot perform, helping to solve problems of misalignment during joining, high-temperature deformation, and maintenance in confined spaces. For specific diameters, materials, pressure ratings, and delivery lead times, please contact us to confirm.
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Slip-on flange
Flat welding flanges are divided into two structural types: plate-type flat welding (PL) and neck flat welding (SO). The pipe is inserted into the inner ring of the flange and then fixed by double-sided fillet welding, achieving a detachable sealed connection between pipe and pipe, valves, pump bodies, and equipment ports. Compared with butt welding flanges, flat welding flanges are easier to align, less difficult to weld during construction, and save material, making them suitable for low- and medium-pressure ambient-temperature pipeline networks with small pressure fluctuations and no severe impact or vibration. The flat welding flanges we produce comply with mainstream standards such as GB/T9113, HG/T20592, ASME B16.5, DIN, and JIS, with flat sealing surfaces, symmetrical bolt hole positions, and qualified end face perpendicularity. Materials cover carbon steel (Q235B, 20#, 16Mn, etc.), stainless steel, and alloy steel, and pressure ratings are compatible with PN6, PN10, PN16, PN25, Class150, and Class300. Conventional small and medium diameters from DN15 to DN200 are sufficiently stocked, and custom non-standard sizes, special sealing surfaces, and surface treatments are supported according to project requirements. If you need selection assistance or a bulk quotation, please contact us and provide information on the medium, pressure, temperature, and quantity.
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Carbon Steel Flanged Pipe Fittings
The carbon steel flanged pipe fittings we produce cover general standards such as GB/T12459, HG/T20592, ASME B16.9, ASME B16.5, DIN, EN, JIS, etc. Materials include Q235B, 20#, A105, A234WPB, 16Mn. Pressure ratings cover PN10–PN40 and Class150–Class300, with nominal diameters from DN15–DN2000. The products are formed by stamping, forging, and CNC precision turning, with flat sealing surfaces and precise bolt hole positions, suitable for conventional on-site welding construction. Compared with stainless steel or alloy pipe fittings, the carbon steel solution has more controllable costs and more ample stock availability, making it suitable for standardized pipeline network projects with clear budgets and tight schedules.
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Alloy Steel Flanged Pipe Fittings
Alloy steel flanged pipe fittings are special pressure-bearing components used in high-temperature and high-pressure piping systems. They are made from chromium-molybdenum alloy steels such as 15CrMo, 12Cr1MoV, Cr5Mo, P11, P22, and P91 as base materials, formed by integral forging, and are suitable for high-temperature, high-pressure, hydrogen-containing, and thermal cycling conditions that ordinary carbon steel and stainless steel cannot handle. The products cover structural forms such as flanges, elbows, tees, and reducing plugs, with pressure ratings covering PN25–PN160 and Class150–Class2500, and nominal diameters covering DN15–DN1200. We can produce according to standards such as ASTM A182, ASTM A234, GB/T12459, HG/T20592, and ASME B16.5, and support customized requirements such as non-standard dimensions, special sealing surfaces, quenching and tempering heat treatment, and non-destructive testing. Before purchasing, it is recommended to provide the medium temperature, pressure rating, material grade, and connection standard, and we will assist in confirming the selection and delivery plan.
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Stainless Steel Flanged Pipe Fittings
Stainless steel flanged pipe fittings are used for the connection, redirection, branching, size reduction, and detachable joining of industrial pipelines. Compared with carbon steel pipe fittings, they are not prone to rusting in acid and alkali media, chloride ion environments, humid salt spray, and clean and sterile working conditions, and they will not precipitate metal impurities into the fluid. We provide diameter coverage from DN15 to DN2000, pressure ratings covering national standard PN10-PN100 and American standard Class150-Class1500, and materials including 304, 304L, 316, 316L, 321, as well as 2205 and 2507 duplex stainless steel. The flanged connection method facilitates later maintenance and system expansion, making it suitable for engineering procurement with specific requirements for corrosion resistance, hygiene grade, and temperature adaptability. For specific material selection, surface treatment, and customized sizes, you are welcome to contact us to confirm according to the project medium and working conditions.
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Forged flanged pipe fittings
Forged flanged pipe fittings are formed through an integral forging process. The raw materials undergo high-temperature forging, upsetting, heat treatment, and precision machining, resulting in a dense internal metal structure in which defects such as porosity, laminations, and looseness are eliminated. Both ends of the product integrate a flange structure, achieving sealed pipeline connections through bolts and gaskets, making disassembly, assembly, and maintenance convenient. The series covers forged flanges, elbows, tees, reducers, pipe caps, and branch outlets, and complies with standards such as GB/T, HG/T, SH/T, ASME B16.5, and ASME B16.9. Nominal diameters are mainly DN15-DN600, and extra-large diameters can be customized up to DN2000. Pressure coverage includes national standard PN40 to PN160 and American standard Class150 to Class2500, while threaded forgings support 3000#, 6000#, and 9000# pound ratings. Materials include A105 carbon steel, 16Mn, 304/316L stainless steel, chrome-molybdenum heat-resistant steel, duplex steel, etc., suitable for the transportation of steam, high-pressure oil and gas, and corrosive media.
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Cast flanged pipe fittings
Cast flanged pipe fittings differ from forged pipe fittings. Through the casting process, large-diameter, special-shaped, and complex-structure pipe fittings can be formed in one piece, with strong integrity, regular dimensions, and a full appearance, and the cost advantage is obvious during mass production. The products we provide cover diameters from DN15 to DN2000, with pressure ratings adapted to PN6, PN10, PN16, PN25, and PN40, and American standards adapted to Class150 and Class300. Materials include gray cast iron, ductile iron, cast steel, stainless steel castings, and alloy cast steel. Before leaving the factory, they undergo aging treatment, grinding and finishing, machining and drilling, and finish turning of the sealing surface. The integrated flange structure requires no secondary welding and can be installed on site by bolting directly. The products are mainly used in low-pressure and normal-temperature pipeline systems such as municipal water supply and drainage, rainwater and sewage diversion, sewage treatment, fire protection pipe networks, heating, ventilation and thermal power, and farmland water conservancy, and are not suitable for high-temperature and high-pressure process pipelines.
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Steel plate rolled flange pipe fittings
Steel plate rolled flange pipe fittings, also called rolled welded flange pipe fittings, are flange pipe accessories we provide for extra-large diameter pipeline projects. They are made from finished steel plates through CNC cutting, hydraulic cold rolling forming, automatic submerged arc welding, weld seam inspection, shaping and aging, and flange machining. The flange and the pipe fitting body are welded into one piece, and sealing and disassembly of the pipeline are achieved by means of bolts and gaskets. The products cover rolled flanges, rolled flange elbows, rolled flange tees, rolled reducers, rolled pipe caps, and rolled blind plates, with nominal diameters DN600 to DN5000, wall thickness 6 mm to 60 mm, pressure ratings PN6, PN10, PN16, PN25, PN40 and American standard Class150, Class300. Commonly used materials include Q235B, Q345B, 16Mn, 20# carbon steel, 304, 316L stainless steel, and weathering steel plates. They comply with standards such as GB/T, HG/T, JB/T, ASME B16.5, and DIN, and are suitable for room-temperature tap water, sewage, rainwater, circulating water, low-pressure gas, and weakly corrosive water bodies, with an operating temperature of -20°C to 350°C. Non-standard widening, thickening, and special-shaped customization are supported, making them suitable for large-scale infrastructure projects and foreign trade export orders.
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Seamless machined flanged pipe fittings
The seamless machined flange pipe fittings we supply are formed directly from a whole seamless steel pipe, with no welded seams, and no sand holes or slag inclusions commonly found in rolled or cast parts. The flange sealing surface is CNC precision-turned, ensuring tight mating and easy disassembly and maintenance. Conventional diameters cover DN15 to DN600, pressure ratings range from PN16 to PN100 and American standard Class150 to Class900, and materials include 20#, Q235B, Q345B, A105 carbon steel, 304, 316L stainless steel, and alloy steel. Categories include seamless flange elbows, tees, reducers, pipe caps, and nipples, suitable for continuous operating conditions such as chemical process pipelines, thermal main pipelines, gas transmission pipelines, and power plant auxiliary equipment pipelines. If you have specific diameter, material, and pressure requirements, welcome to contact us to confirm stock availability or customized solutions.
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