Alloy Steel Flanges
Weld neck, slip-on, socket weld, lap joint, ring type joint & blind flanges in chrome-moly A182 grades for high-temperature service, Class 150 to 2500.
Product Overview
Flanges form the mechanical joint between pipe sections, valves and equipment nozzles. We stock the complete family of facing and bore types across all common pressure classes in chrome-molybdenum alloy steel for high-temperature power and refinery duty.
All flanges are machined and faced in-tolerance to ASME B16.5 (NPS ½″–24″) and B16.47 Series A/B for larger diameters, with raised face, flat face or ring-type-joint facings available.
Alloy Steel Flanges — In Our Stockyard
Flange Types & Standards
| Type | Standard | Description |
|---|---|---|
| Weld Neck (WN) | ASME B16.5 | Tapered hub for high-pressure, cyclic service |
| Slip On (SO) | ASME B16.5 | Economical fitment, easy alignment |
| Socket Weld (SW) | ASME B16.5 | Small-bore, high-pressure piping |
| Lap Joint (LJ) | ASME B16.5 | Used with stub ends on frequently dismantled lines |
| Ring Type Joint (RTJ) | ASME B16.5 | High-pressure / high-temperature metal-to-metal seal |
| Blind Flange | ASME B16.5 | Pipeline or vessel opening closure |
| Threaded Flange | ASME B16.5 | Non-welded, low-pressure connections |
Specifications
- Size Range1/2″ – 48″
- Pressure Class150# – 2500#
- FacingRaised Face, Flat Face, RTJ
- Material GradesAlloy A182 F5, F9, F11, F22, F91
- ManufactureForged, machined to ASME B16.5 / B16.47
- TestingDimensional, Hardness, PMI on request
- CertificationEN 10204 3.1 / 3.2 Mill Test Cert.
- PackingPalletised, bore-plugged for export
Technical Note — Forgings are sourced from certified mills and machined in-house to final bolt-circle and facing tolerance, with PMI available on every batch to confirm chromium and molybdenum content before dispatch.
Applications
Power Plants
Refineries
Petrochemical Plants
Boilers & Heat Exchangers
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