Steel plate rolled flanged pipe fittings, also known as rolled welded flanged pipe fittings, are flanged pipeline accessories we provide for ultra-large diameter pipeline projects. They are made from finished steel plates through CNC cutting, hydraulic cold roll forming, automatic submerged arc welding, weld seam inspection, shaping and aging, and flange machining. The flange and the pipe fitting body are welded as one piece, and rely on bolts and gaskets to achieve pipeline sealing and disassembly. Products cover rolled flanges, rolled flanged elbows, rolled flanged tees, rolled reducers, rolled pipe caps, and rolled blind plates, with nominal diameters DN600~DN5000, wall thickness 6mm–60mm, 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, 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℃～350℃. They support non-standard widened, thickened, and special-shaped customization, and are suitable for large-scale infrastructure projects and foreign trade export orders.
Overview
Steel plate rolled flanged pipe fittings are large-diameter flanged pipeline accessories made from finished steel plates as raw materials through multiple processes including 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 pipeline sealing, disassembly and assembly are achieved by means of bolts and gaskets. It mainly solves the size limitations of forging and casting processes in the production of ultra-large-diameter pipe fittings, and is a commonly used solution for large pipeline projects above DN600. Products include rolled flanges, rolled flanged elbows, rolled flanged tees, rolled reducers, rolled pipe caps and rolled blind plates, and comply with standards such as GB/T, HG/T, JB/T, ASME B16.5, DIN, etc. Nominal diameters range from DN600 to DN5000, wall thickness is 6mm–60mm, and pressure ratings cover PN6 to PN40 as well as American standard Class150 and Class300.
Key Features
First, ultra-large diameters can be produced. We can produce specifications from DN600 to DN5000, breaking through the size upper limits of forging and casting processes, and are suitable for main trunk lines of large pipe networks. Second, non-standard customization is flexible. We can widen flanges, thicken walls, increase neck height, change hole spacing, and change outer diameters according to drawings or on-site measurement data, adapting to special-shaped equipment interfaces. Third, welding and inspection. The flange and the cylinder body are joined by automatic submerged arc welding, and before leaving the factory, weld seam inspection, hydrostatic pressure testing and precise dimensional inspection are carried out, with smooth weld seams and accurate roundness. Fourth, there are many material options. Commonly used materials include Q235B, Q345B, 16Mn, 20# carbon steel, 304, 316L stainless steel and weathering steel plates, and materials can be selected according to the medium and working conditions. Fifth, delivery is flexible. Conventional national-standard large-diameter specifications support ordering from 1 piece, the warehouse regularly stocks DN600–DN2000 general-purpose municipal and water conservancy items in stock, and conventional specifications are shipped quickly within 24–48 hours.
Applications
Steel plate rolled flanged pipe fittings are mainly used in ultra-large-diameter, long-span, non-standard thickened and large equipment supporting pipeline systems. In municipal water conservancy, they are suitable for cross-regional water diversion projects, urban main water supply pipe networks, ultra-large-diameter rainwater and sewage diversion mains, and large buried pipe networks on urban ring roads. In environmental protection and sewage, they are suitable for large sewage treatment plant inlet and outlet mains, ultra-large industrial wastewater discharge pipelines, and connecting pipelines for large sedimentation tank equipment. In energy and power, they are used for large-diameter circulating water pipelines and cooling water pipe networks in thermal power plants and hydropower stations, as well as water supply and drainage pipelines supporting wind power tower barrels. In equipment supporting, they include large storage tank equipment interfaces, bridge water conveyance pipelines, and low-pressure large-diameter chemical process pipelines. The products are suitable for complex working conditions such as buried heavy pressure, open-air wind, sun and rain exposure, and humid corrosion, and are not suitable for high-temperature and high-pressure small-diameter process pipelines.
Specifications
Nominal diameters range from DN600 to DN5000, and wall thickness is 6mm–60mm. Pressure ratings include PN6, PN10, PN16, PN25, PN40, as well as American standard Class150 and 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, DIN, etc. Applicable media are room-temperature tap water, sewage, rainwater, circulating water, low-pressure gas and weakly corrosive water bodies, and the working temperature is -20℃～350℃. Product types include rolled flanges, rolled flanged elbows, rolled flanged tees, rolled reducers, rolled pipe caps and rolled blind plates. Customization is supported for non-standard widening, thickening, increased neck height, special-shaped eccentricity, special-shaped angles, non-standard hole spacing, non-standard outer diameters and non-standard sealing surfaces. Please contact us to confirm specific specification configurations.
Procurement & Delivery
Steel plate rolled flanged pipe fittings adopt a flexible customized minimum order model. Conventional national-standard large-diameter in-stock specifications support ordering from 1 piece, including DN600–DN2000 PN10/PN16 commonly used rolled pipe fittings for municipal, water conservancy and power plant general use. Non-standard customization confirms the minimum order quantity according to project requirements. In terms of delivery time, the warehouse regularly stocks DN600–DN2000 conventional national-standard, municipal and water conservancy general-purpose items in stock, and conventional specifications are shipped quickly within 24–48 hours; conventional standard rolled products are delivered according to the production scheduling cycle; for ultra-large non-standard customized delivery times, please contact us to confirm. Packaging adopts heavy-duty engineering protection, focusing on protecting flange sealing surfaces, machined flat surfaces and weld seam positions. Carbon steel pipe fittings are sprayed with multiple layers of anti-rust primer and topcoat, and stainless steel pipe fittings undergo degreasing and anti-oxidation isolation treatment. Small and medium specifications use pallet fixing, steel strip reinforcement, and full wrapping with stretch film; heavy pipe fittings with ultra-large diameters above DN1000 use solid wood base support, multi-point fixing, and piece-by-piece protection. The outer packaging is marked with specifications, diameter, wall thickness, material, pressure, batch and project number. For foreign trade orders, fumigated pallets, waterproof and rainproof packing, customized English shipping marks and packing lists can be provided.
Service & Support
We provide exclusive after-sales guarantees for large engineering projects for steel plate rolled flanged pipe fittings. All products undergo weld seam inspection, hydrostatic pressure testing, precise dimensional inspection and full appearance inspection before leaving the factory, and genuine products uniformly enjoy a 12-month official warranty service. During the warranty period, for non-human-caused overpressure or improper installation and use, if quality defects such as weld cracking, leakage, dimensional deviation, or substandard roundness occur, we will remake them free of charge, reship them free of charge, and bear the round-trip logistics and rework losses. Before sales, we provide free large-diameter working condition selection, wall thickness and pressure matching, non-standard drawing optimization, on-site parameter verification and engineering budget guidance; during sales, we track production, inspection, anti-corrosion and shipping progress throughout the process; after sales, we provide large pipeline installation and connection guidance, pipe network commissioning, troubleshooting and anti-corrosion maintenance technical support. Unused standard products support seven-day no-reason return and exchange, after-sales response is quick within 2 hours, large projects can have exclusive technical contact, and lifetime free technical consultation for large-diameter rolled pipe fittings is provided.
FAQ
What is the difference between steel plate rolled flanges and forged and cast flanges?
Steel plate rolled flanges focus on ultra-large diameters, non-standard customization and cost-effectiveness, and are suitable for municipal water conservancy large-diameter medium- and low-pressure pipe networks above DN600. Forging is suitable for high-temperature and high-pressure industrial small-diameter pipes, and casting is suitable for conventional medium- and large-diameter batch municipal parts. In ultra-large-diameter scenarios, forging and casting are not as flexible and economical as rolling, and the three have clear distinctions in application scenarios.
Is the welding quality of rolled pipe fittings reliable?
The flange and the cylinder body are welded by automatic submerged arc welding, and before leaving the factory, weld seam inspection, hydrostatic pressure testing, and precise dimensional inspection are carried out. The weld seam is smooth, the roundness is precise, the structure is stable, and it adapts to complex working conditions such as underground heavy pressure, open-air wind and sun exposure, and humid corrosion. If quality defects such as weld cracking or leakage occur within the warranty period, we will remake them free of charge and reship them free of charge.
Can non-standard diameters and special-shaped dimensions be customized?
Yes. We support full-size arbitrary ultra-large diameter customization from DN600 to DN5000, and can customize widened flanges, thickened walls, raised necks, special-shaped eccentricity, special-shaped angles, non-standard hole spacing, non-standard outer diameters, and non-standard sealing surfaces according to needs. One-to-one precise cutting and rolling can be carried out according to customer drawings, on-site measurement data, or the dimensions of old equipment. Please contact us to confirm the specific plan.
What are the delivery time and minimum order quantity for conventional specifications?
Conventional national standard large-diameter in-stock specifications support ordering from 1 piece, including DN600~DN2000 PN10/PN16 commonly used rolled pipe fittings for municipal, water conservancy, and power plant applications. The warehouse regularly stocks conventional national standard items from DN600 to DN2000, and conventional specifications can be shipped quickly within 24-48 hours. For ultra-large non-standard customization delivery time and minimum order quantity, please contact us to confirm.
What standards do the products comply with? What media and temperatures are applicable?
The products comply with domestic and international standards such as GB/T, HG/T, JB/T, ASME B16.5, and DIN. The applicable media are room-temperature tap water, sewage, rainwater, circulating water, low-pressure gas, and weakly corrosive water bodies, and the working temperature is -20℃～350℃. Pressure ratings cover PN6, PN10, PN16, PN25, PN40, and American standard Class150 and Class300.
