ASTM A182 F304/F304L blind flanges BLRF BLRTJ ASME B16.5
BLRF & BLRTJ Blind Flange | ASME B16.5 Product Overview
ASTM A182 F304 / F304L blind flanges are forged austenitic stainless steel flanges used to seal the end of piping systems, valves, or pressure vessel openings.
They are supplied with Blind Raised Face (BLRF) and Blind Ring Type Joint (BLRTJ) facings and manufactured in accordance with ASME B16.5 dimensional standards.
F304 / F304L blind flanges offer good corrosion resistance, excellent formability, and reliable mechanical properties for a wide range of industrial piping applications.
What Is ASTM A182 F304 / F304L?
ASTM A182 is a standard specification covering forged or rolled alloy and stainless steel flanges for high-temperature and pressure service.
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F304: Standard austenitic stainless steel grade with good corrosion resistance
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F304L: Low-carbon version of F304, offering improved weldability and resistance to intergranular corrosion
ASTM A182 F304L is commonly specified for welded piping systems.
Equivalent Grades
| Standard | Grade |
|---|---|
| ASTM / ASME | A182 F304 / F304L |
| UNS | S30400 / S30403 |
| EN | 1.4301 / 1.4307 |
| DIN / EN | X5CrNi18-10 / X2CrNi18-9 |
Chemical Composition (A182 F304L)
| Element | Content (%) |
|---|---|
| Carbon (C) | ≤ 0.03 |
| Chromium (Cr) | 18.0 – 20.0 |
| Nickel (Ni) | 8.0 – 12.0 |
| Manganese (Mn) | ≤ 2.00 |
| Silicon (Si) | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 |
Mechanical Properties
| Property | Typical Value |
|---|---|
| Yield Strength (0.2% Offset) | ≥ 170 MPa |
| Tensile Strength | ≥ 485 MPa |
| Elongation | ≥ 40% |
Blind Flange Facing Types
BLRF – Blind Raised Face
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Used in low to medium pressure systems
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Compatible with raised face mating flanges
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Easy installation and removal
BLRTJ – Blind Ring Type Joint
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Designed for high-pressure and high-temperature service
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Uses metallic ring gasket for superior sealing
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Common in oil & gas and refinery applications
Dimensions & Standards
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Standard: ASME B16.5
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Size Range: 1/2″ – 24″
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Pressure Classes: Class 150, 300, 600, 900, 1500, 2500
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Facing: RF, RTJ
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Manufacturing: Forged
ASTM A182 F304 / F304L blind flanges (BLRF & BLRTJ) provide a cost-effective and reliable solution for sealing pressure piping systems.
Manufactured to ASME B16.5, these stainless steel blind flanges ensure dimensional accuracy, corrosion resistance, and long service life.
Related Products
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ASTM A182 F304 / F304L Slip On Flanges
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ASTM A403 WP304 / WP304L Pipe Fittings
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ASTM A312 TP304 / TP304L Stainless Steel Pipes
