Flanges
Forged and rolled flanges manufactured to major international standards or to customer drawings, in carbon, alloy and stainless steels, duplex grades and superalloys. From as-forged to fully finished components.
- Ø 6,000 mm
- max. diameter
- 30 t
- max. weight per piece
- ASME · API · MSS
- and BS standards
From standard designs to custom solutions.
Standard or custom profiles, forged or made from seamless rolled rings.
Custom Flanges
Non-standard profiles, grooves, shoulders and complex geometries, developed together with the customer's engineering department.
- According to customer-supplied drawings
- Maximum diameter 6,000 mm
- Design calculations available from qualified external engineering firms
Blind Flanges
For closing pipelines, valves and pressure vessels, including large diameters and heavy sections.
- ASME B16.5
- MSS SP-44
- ASME B16.47 Series A and B
- API 605
Slip-on Flanges
Designed to connect pipes, valves or equipment within a piping system, allowing quick installation
- ASME B16.5
- BS 3293
Welding Neck Flanges
The tapered hub distributes stresses toward the pipe: the preferred choice for high pressures and temperatures.
- ASME B16.5
- MSS SP-44
- BS 3293
- ASME B 16.47 Series A and B
- API 605
Tubesheets
- Any size
Self-Reinforcing Long Welding Neck Flanges
- Any size
Swivel Ring Flanges
- Any size
Long Welding Neck Flanges
- ASME B16.5
- Any size
Anchor Flanges
- Any size
Fast Track Flanges. Welding Neck, Swivel, Blind and Slip-on flanges with priority production: up to 70% shorter lead times than standard delivery.
Discover Fast TrackManufacturer of forged flanges, to standard and custom-designed.
Siderforgerossi Group manufactures forged and rolled flanges up to 6,000 mm in diameter, in compliance with the main international standards — ASME B16.5, ASME B16.47 Series A and B, MSS SP-44, API 605 and BS 3293 — or manufactured to customer drawings and specifications. Large-diameter flanges can be produced from seamless rolled rings manufactured in-house.
Production includes standard flanges and custom flanges, developed for applications requiring non-standard profiles, grooves, shoulders or complex geometries. The technical team works with the customer’s engineering department to define the most suitable solution for the operating conditions; when required, design calculations performed by qualified external engineering firms can also be provided.
The flanges are mainly intended for the Oil & Gas, power generation, plant engineering and industrial machinery sectors, with solutions for risers, surface facilities, high-pressure systems and heat exchangers. Available materials include C/Mn carbon steels, fine-grain and high-yield microalloyed steels, alloy and stainless steels, duplex and superduplex grades, Inconel 625, Incoloy 825 and other nickel-based alloys.
Each component can be supplied as-forged, rough-machined or fully machined to drawing. Heat treatments are performed in-house in Nadcap-accredited facilities, while mechanical testing, analyses and non-destructive testing are carried out in the in-house ISO/IEC 17025-accredited laboratory. For selected Oil & Gas flange types, the Fast Track service is also available, reducing lead times by up to 70%, subject to feasibility assessment.
Technical specifications
Indicative production capacity values. For each order, our technical department confirms feasibility, material and heat-treatment cycle.
| Flanges · capacity and technical data | ||
|---|---|---|
| Dimensions | Outside diameter | up to 6,000 mm (from seamless rolled ring) |
| Height | up to 1,600 mm | |
| Weight | up to 30,000 kg per piece | |
| Materials | Carbon steels | Fine-grain C/Mn, high-yield microalloyed steels |
| Alloy, stainless, duplex | Alloy steels, stainless steels, duplex and superduplex grades | |
| Superalloys | Inconel 625, Inconel 825 and nickel-based alloys | |
| Process | Heat treatments | In-house, Nadcap Heat Treating accredited |
| Machining | As-forged, rough-machined or finished to drawing | |
| Testing | Mechanical testing, analyses and NDT in the ISO/IEC 17025 laboratory | |
Frequently asked questions about flanges
What types of flanges do you manufacture?
Custom flanges to customer drawings, blind flanges, slip-on flanges, welding neck flanges, long welding neck flanges including self-reinforcing types, swivel ring flanges, anchor flanges and tubesheets.
Which standards do you manufacture flanges to?
ASME B16.5, ASME B16.47 Series A and B, MSS SP-44, API 605 and BS 3293, or to customer drawings. NORSOK M-650 qualifications and DNV, Lloyd’s Register, Bureau Veritas, RINA and ABS marine approvals are available depending on the production facility.
What is the maximum diameter of your flanges?
Up to 6,000 mm, with flanges produced from seamless rolled rings. The same limit applies to custom flanges manufactured to drawing.
Which materials do you use to manufacture flanges?
Fine-grain C/Mn carbon steels and high-yield microalloyed steels, alloy steels, stainless steels, duplex and superduplex grades, Inconel 625, Inconel 825 and nickel-based alloys.
Do you manufacture flanges to customer drawings?
Yes. Custom flanges with non-standard profiles, grooves, shoulders and complex geometries are developed together with the customer's engineering department, with design calculations available from qualified external engineering firms.
Can the flanges be supplied machined?
They can be supplied as-forged, rough-machined or finished to drawing.
Which flanges are available through Fast Track?
Welding Neck, Swivel, Blind and Slip-on flanges for the Oil & Gas market. Production is given priority and lead times can be reduced by up to 70%, subject to confirmation by the sales representative: simply specify Fast Track when requesting a quotation.
What information is required for a quotation?
Type, standard, dimensions and material are enough for an initial technical assessment.
Send us your specification.
Type, standard, dimensions and material are enough for an initial technical assessment.
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