ASTM A182 F317 / F317L Blind Raised Face Flange
ANSI / ASME B16.5 Stainless Steel Blind Flange
ASTM A182 F317 / F317L blind raised face (BLRF) flanges are forged high-molybdenum austenitic stainless steel flanges used to seal the end of piping systems, valves, or pressure vessel nozzles.
Manufactured in accordance with ANSI / ASME B16.5, these blind flanges provide excellent resistance to pitting, crevice corrosion, and chemical attack, especially in aggressive environments.
Compared with standard 316 / 316L grades, F317 / F317L flanges offer higher molybdenum content, resulting in superior corrosion resistance for demanding industrial applications.
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ASTM A182 F317 is a forging material specification for 317 grade stainless steel and is used for manufacturing bare forgings or forged and machined products for applications involving high temperature service.
ASTM A182 specification covers requirements such as chemical composition, mechanical properties, heat treatment and other supplementary requirements for 317 stainless steel forgings and forged products.
What Is ASTM A182 F317 / F317L?
ASTM A182 is the standard specification for forged or rolled alloy and stainless steel flanges for pressure service.
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F317: High-molybdenum stainless steel with enhanced corrosion resistance
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F317L: Low-carbon version, providing improved weldability and resistance to intergranular corrosion
ASTM A182 F317L is commonly specified for welded systems handling highly corrosive media.
Equivalent Grades
| STANDARD | UNS | WERKSTOFF NR. | JIS | EN |
| F317 | S31700 | 1.4449 | SUS 317 | – |
| F317L | S31703 | 1.4438 | SUS 317L | X2CrNiMo18-15-4 |
Chemical Composition:
| Grade | Si | Cr | Mo | P | C | Mn | S | Ni | Fe |
| F317 | 1 max | 18 – 20 | 3 – 4 | 0.045 max | 0.08 max | 2 max | 0.03 max | 11 – 15 | 57.845 min |
| F317L | 1 max | 18 – 20 | 3 – 4 | 0.045 max | 0.035 max | 2 max | 0.03 max | 11– 15 | 57.89 min |
Mechanical Properties
| Density | 7.9 g/cm3 |
| Melting Point | 1400 °C (2550 °F) |
| Tensile Strength | Psi – 75,000 , MPa – 515 |
| Yield Strength (0.2%Offset) | Psi – 30,000 , MPa – 205 |
| Elongation | 35 % |
Blind Raised Face (BLRF) Flange Design
Blind flanges are solid flanges without a bore and are used to:
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Isolate piping systems
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Allow future pipeline expansion
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Withstand full system pressure
The Raised Face (RF) design provides a reliable sealing surface compatible with spiral wound and soft gaskets.
Dimensions & Standards
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Material Standard: ASTM A182 / ASME SA182
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Flange Standard: ANSI / ASME B16.5
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Facing: BLRF (Blind Raised Face)
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Pressure Classes:
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Class 150
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Class 300
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Class 600
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Class 900
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Class 1500
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Class 2500
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Size Range: 1/2″ – 24″
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Manufacturing Process: Forged
Inspection & Quality Control
ASTM A182 F317 / F317L blind flanges are supplied with full inspection and testing, including:
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Chemical composition analysis
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Mechanical property testing
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PMI (Positive Material Identification)
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Dimensional inspection
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Visual examination
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Certification: EN 10204 3.1
ASTM A182 F317-F317L-Blind Flange
ASTM A182 F317 / F317L blind raised face flanges manufactured to ANSI / ASME B16.5 provide an excellent solution for highly corrosive and pressure-critical piping systems.
With enhanced molybdenum content, superior corrosion resistance, and robust forged construction, F317 / F317L blind flanges are ideal for demanding industrial applications.
Related Products
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ASTM A182 F316 / F316L Blind Flanges
