Zeron Fastners
ASTM A325 Weld Neck Flanges
ASTM A325 Weld Neck Flanges refers to the assembly of Weld Neck Flanges (WNF—typically ASTM A105 carbon steel) utilizing ASTM A325 high-strength structural bolting. Weld Neck Flanges are characterized by a long tapered hub that is butt-welded to the pipe, providing an incredibly strong, high-integrity connection suitable for severe service conditions. When secured with A325 bolts, the assembly benefits from the high tensile strength and clamping force of the quenched and tempered carbon steel fasteners. This combination is vital in industrial piping systems requiring robust construction and sealing integrity, particularly under high pressure and temperature fluctuations. Zeron Fastners supplies the necessary WNF components and A325 bolting for these critical pipeline connections.
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ASTM A325 Type 1 Bolting Chemical Composition (Used with Weld Neck Flanges)
| Element | Content (%) |
|---|---|
| Carbon (C) | 0.30 – 0.52 |
| Manganese (Mn) | 0.60 min |
| Phosphorus (P) | 0.035 max |
| Sulfur (S) | 0.045 max |
| Silicon (Si) | 0.10 min |
| Boron (B) | Optional |
ASTM A325 Bolting Mechanical Properties (Used with Weld Neck Flanges)
| Property | 1/2" to 1" Diameter (min) | 1-1/8" to 1-1/2" Diameter (min) |
|---|---|---|
| Tensile Strength | 120 ksi (827 MPa) | 105 ksi (724 MPa) |
| Yield Strength (0.2% Offset) | 92 ksi (634 MPa) | 81 ksi (558 MPa) |
| Elongation in 4D | 14% | 14% |
| Hardness (Brinell max) | 319 HB | 319 HB |