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The ASME B16.5 WN RF ASTM A105N flange is a high-quality weld neck raised face flange that meets American piping standards. This essential component adheres to the ASME B16.5 standard for dimensions and pressure classes, and is forged from normalized ASTM A105N carbon steel.
It delivers a strong, detachable connection ideal for demanding high-pressure, high-temperature, and high-reliability applications in industrial pipelines.
Key Advantages
The primary strengths of the ASME B16.5 WN RF ASTM A105N flange are its superior mechanical properties and dependable sealing performance.
Superior Structural Strength and Toughness
This flange is forged from ASTM A105 carbon steel and normalized (the “N” designation). Normalization refines the grain structure, eliminates internal stresses, and balances strength with excellent toughness and ductility.
These properties allow the flange to resist mechanical loads, thermal cycling, and stress in severe service conditions. ASTM A105N is a trusted material for valves, fittings, and flanges in high-temperature and high-pressure environments.
ASME B16.5 WN RF ASTM A105N Flange Chemical Composition :
| Element | Composition (wt%, max or range) |
| Carbon (C) | 0.35 max |
| Manganese (Mn) | 0.60 – 1.05 |
| Phosphorus (P) | 0.035 max |
| Sulfur (S) | 0.040 max |
| Silicon (Si) | 0.10 – 0.35 |
| Copper (Cu) | 0.40 max |
| Nickel (Ni) | 0.40 max |
| Chromium (Cr) | 0.30 max |
| Molybdenum (Mo) | 0.12 max |
| Vanadium (V) | 0.08 max |
Mechanical Properties of ASTM A105N (Normalized)
| Property | Minimum Value |
|---|---|
| Tensile Strength | 485 MPa (70 ksi) |
| Yield Strength | 250 MPa (36 ksi) |
| Elongation (in 2″) | 22% |
| Reduction of Area | 30% |
| Hardness (Brinell) | 187 HB max |
Reliable Connection and Sealing Performance
The weld neck (WN) design connects via butt welding, creating a full-penetration joint with strength matching the pipe itself. This makes it ideal for critical, high-stress applications and reduces turbulence or erosion in fluid flow.
The raised face (RF) sealing surface is the industry’s most common style. It concentrates bolt load on a smaller area for better gasket compression, delivering excellent leak prevention—even under fluctuating pressure and temperature.
Common Applications
ASME B16.5 WN RF ASTM A105N flanges are widely used in:
- Oil and gas pipelines
- Petrochemical and refinery plants
- Power generation facilities
- Chemical processing
- Water treatment systems
They perform reliably in severe conditions involving high pressure (Class 150 to 2500), elevated temperatures, and corrosive media (when properly coated or paired with suitable gaskets).
Why Choose ASME B16.5 WN RF ASTM A105N Flanges?
These flanges offer proven durability, easy installation through welding, and cost-effective performance compared to stainless or alloy alternatives for non-corrosive services. Compliance with ASME B16.5 ensures dimensional accuracy and compatibility with standard pipes and gaskets.
At C&N, we specialize in premium forged steel valves, flanges, and piping components, including ASME B16.5 WN RF ASTM A105N flanges. With strict quality control, competitive pricing, and fast delivery, we support global projects in oil & gas, petrochemical, and power industries. Contact us for customized solutions or a quick quote.
