A ring flange is a flat forged ring - no hub, no neck - either finished as a bolted flange ring or supplied as the machining blank for one. It is the flange form used when the dimensions come from an equipment drawing rather than from a pipe table.
Work is controlled by OD, ID, height and wall thickness rather than by NPS. We roll rings up to 1,500 mm OD and 240 mm thick on our D51 ring rolling mill. Larger rings, up to 10,000 mm OD and 500 mm thick, are forged by partner forges near our plant in Dingxiang that run presses up to 10,000 t. Where the drawing follows ASME or EN flange dimensions, those tables are used as the reference. Grades are ASTM A105, A350 LF2, stainless 304, 316, 321 and 347, duplex and super duplex, and the alloy or nickel grades named on the drawing.
Typical use is pressure equipment, rotating machinery, large-diameter piping and heat-treatment fixtures. Machining allowance, out-of-round tolerance, surface finish and heat-treatment condition set the price as much as raw size does, and heavy rings are also checked against single-piece weight, furnace capacity and the export packing route. Inspection is UT, hardness, a dimensional report, the heat-treatment record and MTC 3.1.
Product family: Flanges
Ring flange RFQs are reviewed from drawing, OD, ID, thickness, machining allowance, material, heat treatment, inspection and export packing requirements.
| Scope and rating | |
|---|---|
| Ring geometry range | Forged ring and ring flange RFQs are reviewed by OD, ID, height and wall thickness. We roll rings up to 1,500 mm OD and 240 mm thick on our D51 ring rolling mill. Larger rings, up to 10,000 mm OD and 500 mm thick, are forged by partner forges near our plant in Dingxiang that run presses up to 10,000 t. |
| Supplied variants |
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| Standards and materials | |
| Standards / drawings |
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| Material grades |
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| Geometry, tolerance and inspection | |
| Critical dimensions | OD, ID, height, wall thickness, machining allowance, out-of-round tolerance and heat-treatment condition. |
| Weight review | Heavy rings are reviewed against single-piece weight, furnace capacity, machining envelope and packing route. |
| Inspection depth | UT, hardness, dimensional report, heat-treatment record, MTC 3.1 and traceability. |
| Reviewed before quotation |
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| Buying logic | |
| Best-fit RFQ | Best for ring flanges, machined rings and large OD forged ring blanks. |
| Buyer application | Pressure equipment, rotating equipment, large piping, heat treatment fixtures and custom machining projects. |
Your standard, drawing revision and project specification govern.
Also known as
We confirm each step against your drawing or standard before we quote.
Material grade, heat number, certificate basis and substitution limits are checked against the Ring Flanges drawing or standard before procurement is released.
The forging or ring-rolling route is selected around OD, ID, height, wall thickness, allowance and grain-flow expectations for the finished ring geometry.
Heat treatment is planned against ring section thickness, material grade, hardness or mechanical-test requirements and any low-temperature impact condition.
Rough machining opens OD, ID, end faces or datum bands so ovality, wall allowance and final ring machining risk can be checked early.
Final machining controls OD, ID, height, end-face parallelism, grooves or customer-specified profiles before dimensional inspection is issued.
Inspection covers OD, ID, height, wall thickness, dimensional report, MTC 3.1 and required UT, MT or PT records before shipment release.
Marking, packing and export documents are prepared by PO line item so the Ring Flanges shipment can clear customs and be identified at site receiving.
List document requirements in the first RFQ; they affect price and schedule.
No. A ring flange is a flat forged ring, finished as a bolted flange ring or supplied as the machining blank for one, and it is used when the dimensions come from an equipment drawing rather than a pipe table.
No. They are controlled by OD, ID, height and wall thickness. We roll rings up to 1,500 mm OD and 240 mm thick on our D51 ring rolling mill. Larger rings, up to 10,000 mm OD and 500 mm thick, are forged by partner forges near our plant in Dingxiang that run presses up to 10,000 t. Where the drawing follows ASME or EN flange dimensions, we use those tables as the reference.
No. Machining allowance, out-of-round tolerance, surface finish and heat-treatment condition set the price as much as raw size does, and heavy rings are also checked against single-piece weight, furnace capacity and the export packing route.
Email quote@bldforgedirect.com with standard, drawing, material, quantity and inspection requirements.