SOSteel Pipe FlangesSlip-On Flange (SO)
Sleeve-type flange slipped over the pipe and fixed by fillet welding — economical for medium and low pressure systems.
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Plate Flange (PL)
Flat-type flange with simple structure, light weight and low cost — ideal for low-pressure pipeline systems.
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PLSteel Pipe Flanges
Overview
Plate Flange (PL) is a common flat-type flange with a simple structure, light weight and low cost, widely used in low-pressure pipeline systems. It is connected to the pipe by welding or bolting, with a flat sealing surface that is easy to process and install. As a cost-effective flange type, it is widely used in general industrial pipelines and civil pipeline systems.
Size Range
½" – 80"
Pressure Class
Class 150 – 300 / PN10 – PN25
Key Features
- Simple structure with low manufacturing cost
- Flat sealing surface for easy alignment and installation
- Light weight — suitable for large-scale low-pressure projects
- FF and RF sealing surface options
- Customizable size, material and facing type
Benefits
- Lowest cost flange type for budget-sensitive projects
- Easy to replace and match with standard components
- Ideal for non-corrosive, low-pressure service
Specifications
| Standards | GB/T 9119, ASME B16.5, EN 1092-1, DIN 2501, JIS B2220 |
| Pressure Ratings | Class 150, 300 / PN10, PN16, PN25 |
| Nominal Diameter | DN15 – DN2000 (NPS ½" – 80") |
| Working Temperature | -20°C – 300°C (special grades on request) |
| Sealing Surface | FF (Flat Face), RF (Raised Face) |
Applications
Water supply and drainageHVAC systemsLow-pressure chemical processingFood and beveragePharmaceutical and civil construction
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Standards
- • ISO 7005
- • ASME B16.5
- • EN 1092-1
- • DIN 2501
- • JIS B2220
- • GB/T 9115–9119
- • HG/T 20592
Materials
- • Carbon Steel: A105, 20#, Q235B, A234 WPB
- • Stainless Steel: 304, 304L, 316, 316L, 321
- • Alloy Steel: 16Mn, F11, F22, 15CrMo
- • Duplex & Super Duplex: F51, F53, 2205
- • Special alloys: Monel, Hastelloy, Titanium (on request)
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Loose flange with stub end — convenient disassembly for large-diameter, low and medium pressure systems.
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WNSteel Pipe FlangesWelding Neck Flange (WN)
High-pressure flange with tapered neck and butt-weld connection — the standard for critical HPHT service.
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