Explore our primary manufacturing series of CNC-machined, plain, slip-on, threaded, and specialized forged flanges engineered for high-pressure durability.
In modern industrial fluid handling, energy infrastructure, and mechanical construction, carbon steel plate flanges (often designated as plain flanges, flat flanges, or slip-on plate flanges per EN 1092-1 Type 01 and ASME B16.5) serve as vital mechanical connectors. Operating out of Shanxi Yuxin Casting & Forging Co., Ltd.—located in Dingxiang County, Shanxi Province, widely acclaimed as the "Hometown of Forging in China"—our facility has championed advanced metallurgical processing and precision machining since 1992.
Carbon steel plate flanges are manufactured from high-tensile hot-rolled steel plates or forged structural billets such as ASTM A105, Q235B, S235JR, P250GH, and ASTM A36. Unlike hubbed weld neck flanges designed for extreme cyclic fatigue, plate flanges provide a compact, highly cost-effective joint solution for low-to-medium pressure applications (Class 150 to Class 300, or PN6 to PN40). Their flat profile allows them to slide over the pipe outer diameter (Slip-On design) or be fillet-welded on both inner and outer circumferences, eliminating complex bevel joint preparation on the host pipe.
Understanding how enterprise buyers optimize Total Cost of Ownership (TCO) when sourcing volume carbon steel flanges.
By leveraging computer-controlled nesting software on high-definition CNC plasma cutters and precision ring-rolling machinery, factory scrap rates are reduced by up to 18%. These raw material savings are passed directly to enterprise EPC contractors as wholesale volume discounts.
Our Shanxi manufacturing facility maintains pre-set carbide tooling and multi-spindle drilling heads for standard ANSI B16.5, EN 1092-1, DIN, JIS, and BS flange dimensions. Rapid machine setup minimizes labor overhead per unit during mass production runs.
Direct proximity to Shanxi's massive coal and iron industrial base provides immediate access to high-grade steel billets. Combined with streamlined export shipping routes from Tianjin Port, freight delays and intermediate stocking costs are eliminated.
Carbon steel plate flanges are structural workhorses deployed across diverse global infrastructure projects. Shanxi Yuxin tailors metallurgy, facing finishes, and protective anti-corrosion coatings to fit specific operational environments.
In municipal water transmission lines, district cooling, and effluent treatment facilities, low-pressure EN 1092-1 PN10/PN16 plain flanges provide leak-free joints. Coated with yellow anti-rust varnish, black bitumen, or hot-dip galvanizing, these plate flanges resist soil corrosion and atmospheric oxidation for decades.
Within refinery tank farms, fuel transfer stations, and chemical auxiliary lines, ASTM A105 slip-on plate flanges are widely specified. Raised Face (RF) geometries combined with spirally serrated contact surfaces (125–250 µin AARH) ensure tight gasket seating under thermal expansion and moderate line pressures.
OEM equipment manufacturers rely on custom carbon steel plate flanges for pump casings, heat exchanger nozzles, boiler manifolds, and large-diameter HVAC ductwork. Non-standard bolt-hole patterns and custom thickness profiles are precision-drilled directly to customer PDF/DWG specifications.
Approved under global marine standards, plate flanges used in ballast systems, bilge piping, and fuel bunkering are subject to rigid dimensional and ultrasonic testing. Fine-grain carbon steel ensures notch toughness and fatigue resistance in marine environments.
A comprehensive technical reference detailing manufacturing envelope, dimensional compliance, and material grades provided by Shanxi Yuxin Casting & Forging Co., Ltd.
| Standard System | Flange Types | Nominal Size (DN / Inch) | Pressure Classes | Material Grades | Facing Finishes |
|---|---|---|---|---|---|
| ASME / ANSI B16.5 | Slip-On Plate, Plain Plate, Blind | ½" – 24" (DN15 – DN600) | Class 150, Class 300, Class 600 | ASTM A105, A36, A350 LF2 | Stock Finish, Smooth Finish, RF, FF |
| ASME B16.47 (Ser. A/B) | Large Diameter Plate & Blind | 26" – 60" (DN650 – DN1500) | Class 75, Class 150, Class 300 | ASTM A105, Q235B, Q355B | Raised Face (RF), Flat Face (FF) |
| EN 1092-1 | Type 01 (Plate), Type 02 (Loose) | DN15 – DN2000 | PN6, PN10, PN16, PN25, PN40 | S235JR, P250GH, P280GH, C22.8 | Type A (Flat), Type B1 (Raised) |
| DIN Standards | DIN 2573, 2576, 2502, 2503 | DN10 – DN1200 | ND 6, ND 10, ND 16, ND 25 | RSt37-2, St37.2, C22.8 | Form A, Form B (Flat/Raised Face) |
| JIS B2220 | SOP (Slip-On Plate), SOH, BL | 10A – 1500A | 5K, 10K, 16K, 20K | SS400, SF440A, SM490A | RF, FF (Smooth Machined) |
Navigating global trade mandates requires rigorous regional compliance, robust export packaging, and transparent documentation.
Our operational framework is audited and certified under ISO 9001:2015 by TÜV CERT, European Pressure Equipment Directive (PED 2014/68/EU), AD 2000-Merkblatt W0 / TRD 100, and holds Chinese Special Equipment Manufacturing Licences (TS certification).
To withstand humidity and mechanical stress during intercontinental sea freight, flanges receive anti-rust treatments (yellow oil, black lacquer, or rust-inhibitor spray), face caps for protection, and are packed into fumigation-free ISPM-15 compliant plywood cases or steel pallets.
In addition to standard ANSI/DIN/EN stock, our engineering division supports drawing-based manufacturing for non-standard pitch circle diameters (PCD), special flange thicknesses, custom hub configurations, and exotic carbon-alloy clad plates.
The global steel pipe flange market is undergoing rapid technological evolution. Shanxi Yuxin is leading key industry transformations:
Addressing common engineering and procurement queries regarding carbon steel plate flanges.
Explore additional certified forged and machined flange types available for bulk export orders.
