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, full appearance, and obvious cost advantages in mass production. The products we provide cover diameters from DN15 to DN2000, pressure ratings adapted to PN6, PN10, PN16, PN25, 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 sealing surfaces. The integrated flange structure requires no secondary welding and can be installed on site by bolting. 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, HVAC and heating, and farmland water conservancy. They are not suitable for high-temperature and high-pressure process pipelines.
Overview
Cast flanged pipe fittings are complete sets of flanged pipe fittings that we cast and form in one piece using sand casting, precision casting, and lost-wax casting processes. Unlike forged pipe fittings, the casting process can integrally form large-diameter, irregular, and complex-structure pipe fittings, with strong integrity, regular dimensions, full appearance, and high cost-effectiveness in mass production. Products cover a full set of pipeline accessories such as cast flanges, cast flanged elbows, cast flanged tees, cast flanged reducers, cast flanged caps, and cast flanged blind plates. Before leaving the factory, they undergo aging treatment, grinding and finishing, machining and drilling, and fine turning of sealing surfaces, resulting in a stable structure and high sealing precision. Products strictly follow domestic and international standards such as GB, HG, JB, ANSI, ASME, BS, and DIN, with diameters covering DN15 to DN2000, pressure ratings adapted to mainstream medium- and low-pressure working conditions of PN6, PN10, PN16, PN25, and PN40, and American standards adapted to Class150 and Class300. Mainstream materials include gray cast iron, ductile iron, cast steel, stainless steel castings, and alloy cast steel.
Key Features
Large-diameter forming capability is a prominent advantage of cast flanged pipe fittings, capable of forming extra-large-diameter pipe fittings from DN1200 to DN2000 in one piece, solving the problems of high cost and difficult forming for large diameters in stamping and forging processes. Integral casting and forming makes the pipe fitting structure dense, with sufficient wall thickness and high rigidity, resistant to compression and settlement when buried underground, and not prone to fracture. The flange and pipe body are integrated, requiring no secondary welding on site, installed by bolt connection, with fast construction speed, stable sealing performance, and convenient disassembly and assembly for later maintenance. Mass production cost is low, suitable for large-volume centralized procurement for municipal infrastructure projects and foreign trade export orders. The product line covers a full set of accessories such as flanges, elbows, tees, reducers, caps, and blind plates, allowing one-stop supporting procurement. We can also carry out one-to-one mold opening and casting according to customer drawings and technical agreements, supporting customization for irregular shapes, special materials, and special pressure ratings.
Applications
Cast flanged pipe fittings are specially used in medium- and low-pressure, large-diameter, buried, and civil infrastructure pipeline scenarios, fully covering municipal water supply and drainage, urban rainwater and sewage, farmland water conservancy, fire protection pipe networks, HVAC and heating, and plant civil and industrial pipeline systems. Municipal scenarios include urban main road water supply networks, rainwater and sewage diversion networks, old urban area pipe network renovation, and municipal supporting greening water supply systems. Water conservancy scenarios are suitable for reservoir water diversion, river water transmission, farmland irrigation, township centralized water supply, and buried pipelines of large-scale water diversion projects. Environmental protection and sewage scenarios are used for inlet and outlet pipes of sewage treatment plants, plant sewage circulation networks, and low-pressure chemical sewage discharge. Products can adapt to complex geology, temperature differences, and humid and corrosive soil environments. It should be noted that cast flanged pipe fittings are not suitable for high-temperature and high-pressure process pipelines; for such working conditions, please choose forged pipe fittings.
Specifications
Diameters cover the full range of specifications from DN15 to DN2000, pressure ratings are adapted to mainstream medium- and low-pressure working conditions of PN6, PN10, PN16, PN25, and PN40, and American standards are adapted to Class150 and Class300. Mainstream materials include gray cast iron, ductile iron, cast steel, stainless steel castings, and alloy cast steel. Products strictly follow domestic and international standards such as GB, HG, JB, ANSI, ASME, BS, and DIN. For parameters such as wall thickness, flange hole spacing, and sealing surface form corresponding to specific specifications, please contact us for confirmation. For non-standard customization, drawings or technical agreements can be provided, and we will assist in confirming the mold opening plan.
Purchasing & Delivery
We adopt an ultra-low-threshold flexible minimum order model. Conventional national standard and commonly used municipal in-stock specifications support ordering from 1 piece, including standard cast iron and cast steel pipe fittings in mainstream pressures PN10 and PN16 and conventional small and medium diameters, which can meet needs such as construction site emergency repairs, local pipe network renovation, and sample submission for inspection. The warehouse keeps in stock cast iron and cast steel products in mainstream municipal conventional diameters for PN10 and PN16, shipped within 24 hours after order confirmation. For conventional mass production and large-diameter non-standard customization lead times, please contact us for confirmation. Packaging uses engineering-grade thickened protection, focusing on protecting flange sealing surfaces, bolt holes, and the outer walls of pipe fittings. Small and medium diameters are individually wrapped in bubble film and packed in thickened hard cardboard boxes; large-diameter heavy pipe fittings are fixed on solid wood pallets, tightened with steel straps, and fully wrapped in multiple layers of stretch film. We support foreign trade fumigated wooden pallets, waterproof packaging, customized English shipping marks, and independent packing lists, suitable for less-than-truckload, full-truckload, sea freight, and long-distance transportation.
Service & Support
All products undergo 100% full inspection of appearance, dimensions, and hydrostatic pressure 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 use, any problems such as casting sand holes, cracks, leakage, dimensional deviation, or failure to meet quality standards will all be replaced free of charge and reshipped free of charge, and we will bear the round-trip logistics costs. Before sales, we provide free services for pipe network working condition selection, pressure matching, material recommendation, drawing verification, and engineering budget quotations. During sales, we track the entire process of production, quality inspection, and shipment in real time to ensure consistent quality of bulk orders. After sales, we provide pipeline installation guidance, pipe network operation and maintenance suggestions, and technical support for troubleshooting. For large municipal water conservancy projects, we can provide full-process technical coordination services, and support seven-day no-reason return or exchange for unused standard products with intact packaging. After-sales response is rapid within 2 hours, problems are solved the same day, and we provide free lifetime technical consultation and selection guidance for cast pipe fittings.
FAQ
What is the difference between cast flanged pipe fittings and forged flanged pipe fittings?
Cast pipe fittings are integrally cast and formed in one piece, offering high cost-effectiveness for large diameters, high rigidity, and resistance to underground settlement, suitable for municipal, water conservancy, and sewage low-pressure normal-temperature civil pipelines. Forged pipe fittings are formed by high-temperature forging, with dense grains, high pressure resistance and high temperature resistance, specifically used for power plants and petrochemical high-pressure industrial pipelines. The two have completely different working conditions and must not be used interchangeably.
What pressures and diameters are cast flange pipe fittings suitable for?
Our cast flange pipe fittings cover diameters from DN15 to DN2000, with pressure ratings adapted to PN6, PN10, PN16, PN25, PN40 medium and low pressure working conditions, and American standards adapted to Class150 and Class300. When selecting models for specific projects, please provide the medium, temperature, pressure, diameter, and connection standard, and we will assist in confirming the appropriate product configuration.
Can cast flange pipe fittings be customized to non-standard specifications?
Yes. We support thickened cast customization for any extra-large diameter within DN2000, and can produce special-shaped flange pipe fittings, special-shaped tees, and eccentric special-shaped reducer pipe fittings. Pressure ratings can be customized to the full series of non-standard specifications from PN6 to PN40. Materials can be customized to gray iron, ductile iron, cast steel, 304/316L stainless steel, and alloy cast steel. We support custom processing for non-standard flange hole spacing, non-standard sealing surfaces, special thickened wall thickness, and special-angle elbows. Please provide drawings or technical agreements, and we will carry out one-on-one mold opening and casting.
What are the minimum order quantity and delivery time for cast flange pipe fittings?
Conventional national standard and commonly used municipal in-stock specifications support a minimum order of 1 piece, including PN10 and PN16 mainstream pressures and conventional small and medium diameter cast iron and cast steel standard pipe fittings. The warehouse regularly stocks PN10 and PN16 municipal mainstream conventional diameter cast iron and cast steel in-stock items, shipping within 24 hours after order confirmation. For conventional mass production and large-diameter non-standard customization delivery times, please contact us to confirm.
How are cast flange pipe fittings packaged and transported?
We use engineering-grade thickened protective packaging, with a focus on protecting flange sealing surfaces, bolt holes, and the outer walls of pipe fittings. Small and medium-diameter pipe fittings are individually wrapped in bubble film and reinforced with thickened hard cardboard boxes; large-diameter heavy-duty cast pipe fittings are secured on solid wood pallets, locked with steel straps, and fully wrapped with multiple layers of stretch film for dustproof and moisture-proof protection. The outer packaging clearly marks specifications, diameter, material, pressure rating, executive standards, and production batch. We support export fumigation wooden pallets, waterproof packing, customized English shipping marks, and independent packing lists, suitable for less-than-truckload, full-truckload, sea freight, and long-distance transportation.
