Carbon Steel Long Weld Neck Flanges: ASME B16.5, ASTM A105 / A350 LF2. Get quotes from verified suppliers on MetalMitra.
- Carbon Steel Long Weld Neck Flanges
- Long Weld Neck Flanges
- ASME B16.5
- ASTM A105 / A350 LF2
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Specifications
| Standard | ASME B16.5 drilling |
|---|---|
| Material | ASTM A105, A105N, A350 LF2 |
| Size | 1/2" to 24" |
| Class | 150 to 2500 |
| Neck Length | 9", 12" or to drawing |
| Facing | RF, RTJ |
Grades & standards
- Carbon Steel A105
- Low Temperature Carbon Steel A350 LF2
- ASTM A105
- ASTM A350
- ASME B16.5
Chemical composition & mechanical properties
| C | Mn | P | S | Si |
|---|---|---|---|---|
| 0.35 | 0.60–1.05 | 0.035 | 0.040 | 0.10–0.35 |
| Tensile strength, min | 485 MPa |
|---|---|
| Yield strength (0.2%), min | 250 MPa |
| Elongation in 50 mm, min | 22% |
| Hardness, max | 187 HBW |
Single values are maximums unless marked min. Values per ASTM A105 (forgings); always confirm against the purchase specification and the mill test certificate.
| C | Mn | P | S | Si |
|---|---|---|---|---|
| 0.30 | 0.60–1.35 | 0.035 | 0.040 | 0.15–0.30 |
| Tensile strength, min | 485 MPa |
|---|---|
| Yield strength (0.2%), min | 250 MPa |
| Elongation in 50 mm, min | 22% |
| Hardness, max | 197 HBW |
Single values are maximums unless marked min. Values per ASTM A350 (forgings); always confirm against the purchase specification and the mill test certificate.
Source Carbon Steel Long Weld Neck Flanges from verified manufacturers, mills and stockists on MetalMitra. Carbon and low-temperature carbon steel long weld neck flanges for vessel nozzles and process equipment.
Share your size, grade, quantity and delivery location once, and compare offers from suppliers who stock or manufacture Carbon Steel Long Weld Neck Flanges to ASME B16.5 drilling.
What you can source
- Standard LWN — Long weld neck flanges with standard barrel.
- Heavy Barrel LWN — HB type with thicker barrel for nozzles.
- Equal Barrel LWN — EB type with uniform barrel bore.
- Custom Lengths — Neck lengths made to drawing.
Key properties
- Nozzle Ready — Ideal for vessel and column nozzles.
- Integral Reinforcement — Long neck reinforces the vessel opening.
- Forged Integrity — One-piece forging with no weld seam.
- Pressure Rated — Class 150 to 2500 to ASME B16.5 drilling.
Applications & industries
- Pressure Vessels
- Distillation Columns
- Reactors
- Heat Exchangers
- Refineries
- Petrochemical Plants
Testing & documentation
Inspection and documentation for Carbon Steel Long Weld Neck Flanges follow ASME B16.5 drilling plus any extra requirements in your PO.
- Visual & dimensional inspection
- Positive material identification (PMI)
- Hardness test
- Ultrasonic test as applicable
- Third-party inspection on request
- EN 10204 3.1 Mill Test Certificate
Why source on MetalMitra
- Verified suppliers — Mills, manufacturers and stockists are reviewed by the MetalMitra team before they list.
- One RFQ, several quotes — Share size, grade and quantity once and compare offers side by side.
- Full traceability — Heat numbers, test certificates and third-party inspection on request.
- Delivered worldwide — Export-worthy packing and shipping to India, the Middle East, Africa, Europe and the Americas.
Request pricing
Post an RFQ for Carbon Steel Long Weld Neck Flanges with your drawing or specification and receive quotes from verified suppliers.
Technical note: Values on this page are for reference. Always confirm against the governing standard, your purchase specification and the test certificate.
Applications & industries
- Pressure Vessels
- Distillation Columns
- Reactors
- Heat Exchangers
- Refineries
- Petrochemical Plants
- Oil & Gas
- Petrochemical & Refining
- Power Generation
- Chemical Processing
Testing & documents
Ask for the documents you need in your requirement — suppliers confirm them in their quotation:
- Mill test certificate to EN 10204 3.1, or 3.2 with third-party witness
- Third-party inspection (TPI) by SGS, Bureau Veritas, TÜV or your nominated agency
- Tests as the standard or your order requires: hydro, PMI, IGC, NDT, hardness or impact tests
FAQs
A weld neck flange with an extended neck, typically 9" or 12", used mostly as a nozzle on vessels.
Heavy Barrel (HB) has a thicker tapered barrel; Equal Barrel (EB) has a constant barrel diameter.
Yes, LWN flanges are commonly forged to customer-specified lengths.
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