ASME B16.5 ASTM A182 F304 F304L Blind Flange
2. Standard: ASME B16.5 / ASTM A182, standard specification for forged steel pipe flanges and flanged fittings
3. Process: 100% solid-billet industrial forging followed by precise CNC blanking, drilling, and sealing face finishing
4. Size Range: Blind (BL) solid plate configurations from 1/2" to 24", covering standard Pressure Classes 150 to 1500
5. Heat Treatment: Program-controlled furnace solution annealing followed by rapid uniform water quenching to stabilize structures
6. Surface Finish: Two-side machined smooth blank profile with standard stock finish phonographic serrations on the raised face (RF)
7. Application: Main pipeline terminal isolation, high-pressure inspection ports, vessel manhole closures, and bypass systems
8. Service Advantage: Large ready stock of standard dimensions for immediate container loading, flexible custom requirements
9. Packaging: Secure international sea-freight packing with heavy wooden pallets or reinforced plywood dunnage framing
10. Key Advantage: Solid hubless construction provides a complete physical boundary barrier to absorb immense end-of-line hydraulic shocks
ASME B16.5 ASTM A182 F304 F304L Blind Flange - Premium Forged Terminal Isolation Solution for High-Pressure Pipeline Systems
Hebei All Trust Steel Co., Ltd delivers industrial-grade ASME B16.5 ASTM A182 F304 F304L Blind Flange manufactured through precision closed-die forging and CNC machining processes. With an annual production capacity exceeding 15,000 tons and 100% hydraulic testing rate, our dual-certified F304/F304L blind flanges provide absolute flow isolation at pipeline terminations.
These solid plate flanges feature solution-annealed chromium-nickel alloy chemistry with guaranteed minimum 18% Cr and 8% Ni content. Available in sizes from 1/2" to 24" across pressure classes 150# to 2500#, every piece undergoes ultrasonic flaw detection and dimensional verification before shipment with EN 10204 3.1 Mill Test Certificates.
What Makes Our Blind Flanges the Ideal Terminal Sealing Solution
The product serves as a complete physical barrier for pipeline end closures, inspection port covers, and vessel manhole applications. Unlike other terminal fittings, this hubless solid disc construction absorbs immense end-of-line hydraulic shocks without deformation.
Our manufacturing process combines heavy plate forging with multi-axis CNC bolt hole drilling. This ensures micro-tolerance flatness essential for reliable gasket seating. The dual-certified F304/F304L material provides both the mechanical strength of standard 304 and the enhanced weldability of low-carbon 304L grade.
Each forged blank undergoes program-controlled solution annealing at 1040°C followed by rapid water quenching. This heat treatment eliminates carbide precipitation and restores optimal corrosion resistance. The raised face (RF) receives standard phonographic serrations to lock gaskets firmly in place.
With more than 5,000 tons of rolling inventory, we ship standard dimensions within 3–5 days. Custom specifications including flat face (FF) and ring type joint (RTJ) configurations are completed in 15–20 days.
Technical Specifications of ASME B16.5 ASTM A182 F304 F304L Blind Flange
| Parameter | Details |
|---|---|
| Manufacturing Standard | ASME B16.5 / ASTM A182 / EN 1092-1 |
| Product Type | Blind Flange (BL) / Terminal Blanking Plate |
| Material Grade | F304 / F304L Dual Certified (UNS S30400 / S30403) |
| Production Process | Closed Die Press Forging + CNC Face Machining |
| Size Range | 1/2" to 24" NPS |
| Pressure Class | 150# / 300# / 600# / 900# / 1500# / 2500# |
| Face Type | Raised Face (RF) / Flat Face (FF) / RTJ |
| Heat Treatment | Solution Annealing + Water Quenching |
| Surface Finish | Machined Flat Plate with Concentric Grooves |
| Chemical Composition | Cr ≥18%, Ni ≥8%, C ≤0.03% (F304L) |
| Tensile Strength | Minimum 515 MPa (75 ksi) |
| NDT Testing | Ultrasonic (UT) / Liquid Penetrant (PT) / PMI |
| Certificates | EN 10204 3.1/3.2 MTC / ISO 9001:2015 / CE / PED |
| Third-Party Inspection | SGS / BV / TUV / DNV / ABS Accepted |
| Packaging | Plywood Crates / Fumigated Wooden Cases / Polyethylene Sleeves |
Core Manufacturing Advantages
Premium Dual-Certified Alloy Chemistry
Our ASME B16.5 ASTM A182 F304 F304L Blind Flange uses 100% virgin stainless steel with guaranteed chromium and nickel content. The low-carbon F304L variant limits carbon to 0.03% maximum, preventing intergranular corrosion during welding operations. This dual certification combines the superior mechanical strength of F304 with the enhanced corrosion resistance of F304L.
Every heat batch undergoes spectrographic analysis to verify alloy composition. Complete traceability documentation includes heat numbers and PMI reports for global project compliance.
Precision Forging and Surface Finishing
We employ closed-die press forging to create solid disc blanks with uniform grain structure. Multi-axis CNC machining ensures bolt hole positioning accuracy within ±0.5mm tolerance. Center deflection hardness testing confirms maximum 187 HBW values per ASME requirements.
The raised face receives standard stock finish phonographic serrations ranging from 125 to 250 AARH. This controlled surface roughness optimizes gasket compression and prevents leakage under high pressure.
Comprehensive Quality Testing Protocol
Before shipment, every flange completes our four-step inspection process:
- Ultrasonic flaw detection to identify internal voids
- Liquid penetrant testing for surface crack detection
- Dimensional verification of thickness, diameter, and bolt holes
- Positive Material Identification confirming alloy composition
Representative samples undergo tensile testing, room temperature impact testing, and intergranular corrosion evaluation. All results appear in certified EN 10204 3.1 Mill Test Certificates.
Why Pipeline Engineers Trust Our Blind Flanges
Your pipeline system demands reliable terminal isolation that withstands pressure surges and thermal cycling. Our forged blind flanges deliver solid plate construction that eliminates flow-through risks completely.
The solution annealed microstructure exhibits good cryogenic toughness down to -196°C. At the same time the chromium-nickel matrix resists oxidation up to 800°C in non-pressurised applications . Its ability to operate throughout this temperature range makes it well suited for a variety of industrial applications ranging from LNG facilities to petrochemical operations.
We have strategic alliances with 15+ competent steel factories, assuring a consistent raw material supply. Our quality assurance team oversees every step of the production process, from examination of the billet to final packaging. Third party witness testing by SGS, TUV or BV may be conducted on request .
Custom modifications include special drilling patterns, non-standard pressure ratings, and alternative face finishes. Our engineering team provides CAD drawing verification and material selection guidance for your specific application.
Secure Export Packaging and Global Delivery
Every blind flange receives individual polyethylene protective sleeves to prevent surface scratches during transit. Units are bundled in heavy-duty plywood crates with steel strapping or fumigation-free wooden cases for sea freight.
Hard plastic face caps protect the machined sealing surface from impact damage. Our packaging design prevents moisture ingress, salt corrosion, and handling deformation across international shipping routes.
We ship from Shanghai, Ningbo, Tianjin, Qingdao, and Shenzhen ports with flexible FOB, CFR, CIF, or DDP terms. Mixed container loading with pipes, fittings, and valves optimizes your freight costs.
FAQ
Q：What defines the foundational fluid isolation capability of this product?
A：Utilizing dual-certified premium chromium-nickel alloy chemistry, this blind flange provides absolute flow isolation and reliable multi-environment oxidation resistance, serving as a robust solid plate seal at pressure pipeline termination boundaries.
Q：How does your factory achieve the exceptional mechanical flatness parameters required for this solid blanking face plate?
A：We implement precision closed die press forging and heavy plate flattening methods from certified raw inputs, followed by multi-axis CNC surface machining and precision bolt hole drilling to lock in micro-tolerances.
Q：What mechanical deformation testing is contractually performed to ensure the structural safety of this forged solid disc?
A：Representative production coupons are subjected to room temperature tensile property verification, center-point hardness profile tracking, and cross-sectional macro-etched structural validation to confirm complete compliance.
Q：Can this universal blind flange series be customized with specific pressure class allocations?
A：Yes, we offer extensive manufacturing flexibility, accommodating standard pressure ratings from Class 150 to Class 2500, supporting tailored face types including Raised Face (RF), Flat Face (FF), or Ring Type Joint (RTJ).
Q：What independent third-party inspection certifications are accepted for this dual-certified blind flange?
A：Our entire manufacturing line fully adheres to ISO 9001:2015 benchmarks, carries CE/PED compliance, and completely welcomes independent witness inspections from certified third-party bureaus such as SGS, TUV, and BV.
Contact Us
Ready to secure reliable pipeline closure components with the ASME B16.5 ASTM A182 F304 F304L Blind Flange? Email our technical team at info@hballtrust.com for quotations, material certificates, and custom specification support today.
