| Specification | Details |
|---|---|
| Material | Carbon Steel ASTM A105N (Normalized) |
| Type | BLRF – Blind Raised Face Flange |
| Class/Pressure Rating | 150#, 300#, 600#, 900#, 1500#, 2500# (as per ASME B16.5) |
| Size Range | ½" to 48" (DN15 to DN1200) |
| Standards | ASME B16.5, ANSI B16.47, DIN, EN, BS, ISO |
| Face Type | Raised Face (RF), also available in Flat Face (FF) or Ring Type Joint (RTJ) |
| Temperature Range | -29°C to 425°C (approx., depending on pressure and application) |
| Applications | Oil & Gas, Petrochemical, Power Plants, Marine, Refineries, Water Treatment |
| Testing & Certification | Hydrostatic Testing, PMI, Ultrasonic, MTC EN 10204 3.1/3.2 available |
| Surface Coating | Rust preventive oil, black paint, or as per customer specification |
| Element | Composition (%) |
|---|---|
| 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 (if specified) |
| Nickel (Ni) | 0.40 max (if specified) |
| Chromium (Cr) | 0.30 max (if specified) |
| Molybdenum (Mo) | 0.12 max (if specified) |
| Vanadium (V) | 0.08 max (if specified) |
| Property | Value | Unit | Notes |
|---|---|---|---|
| Tensile Strength | 485 min | MPa (70 ksi min) | Minimum required per ASTM A105N |
| Yield Strength | 250 min | MPa (36 ksi min) | 0.2% Offset Yield Strength |
| Elongation | 22 min | % | For 50 mm (2 in.) gauge length |
| Reduction of Area | 30 min | % | As per standard mechanical test |
| Hardness (Brinell) | 187 max | HB | May vary slightly based on heat treatment |
| Impact Strength (Charpy V-notch) | Typically >27 J at -20°C | Joules | Only applicable if normalization is specified |
| A105 Pressure Vessel Flange | Forged A105 Blind Flange |
| A105 Flange RTJ | A105 RF Blind Flange |
| CS HEAVY BLRF FLANGE | ANSI B16.47 Series A Blind Flange |
| ANSI B16.47 Series B Blind Flange | MSS SP-44 A105 Blind Flange |
| A105 Schedule 160 Blind Flange | ANSI/ASME B16.5 Blind Flange |
| ANSI/ASME B16.47 Series A(MSS SP44) Blind Flanges | ANSI/ASME B16.47 Series B Blind Flange |
| carbon steel slip on flanges | Custom A105 Blind Flange |
| A105 Forged Oversized Flange | A105 XXS Blind Flange |
An A105N BLRF Flange refers to a Blind Raised Face flange made from ASTM A105N (normalized carbon steel). It is used to close the ends of piping systems and pressure vessel openings, ensuring safe isolation.
The “N” indicates that the flange has been normalized during heat treatment. This improves the material’s toughness, ductility, and grain structure, making it more reliable for pressure and temperature variations.
The RF design provides a better sealing surface, ensures gasket alignment, and allows uniform pressure distribution, making it suitable for high-pressure and high-temperature applications.
They are widely used in oil & gas, petrochemical, power generation, shipbuilding, and chemical industries for pipeline closures and system isolation.
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