ASME B16.5 ASTM A182 F316 F316L Blind Flange
2. Standard: ASME B16.5 / ASTM A182, standard specification for severe-duty forged pressure equipment and pipeline components
3. Process: Advanced heavy closed-die forging from premium ingots, guaranteeing an absolute seamless solid core matrix
4. Size Range: Blind (BL) configurations matching all standard pipeline codes up to Class 2500 heavy pressure limits
5. Heat Treatment: Mandatory high-temperature solution tempering to completely remove residual stresses and restore alloy balance
6. Surface Finish: Clean uniform acid-pickled passivated matte, or CNC-machined sealing face with spiral serrated grooves
7. Application: Coastal desalination lines, offshore platform terminal sealing, marine manifold closures, and heavy acid towers
8. Service Advantage: 100% ultrasonic defect verification (UT), 100% PMI verified, full technical NDT filming reports provided
9. Packaging: Each blind flange carefully individual-wrapped and securely packed into heavy-duty seaworthy wooden boxes
10. Key Advantage: Eliminates downstream flow completely while offering supreme defense against chloride-induced pitting and crevice erosion
Premium ASME B16.5 ASTM A182 F316 F316L Blind Flange for Heavy-Duty Pipeline Terminal Isolation and Corrosion-Critical Sealing Solutions
Hebei All Trust Steel Co., Ltd specializes in manufacturing high-integrity ASME B16.5 ASTM A182 F316 F316L Blind Flange components engineered for demanding offshore and chemical processing applications. Each flange is precisely forged from dual-certified F316/F316L marine-grade alloy with molybdenum increased corrosion protection. Our blind flanges provide full leak proof terminal sealing of Class 150 through Class 2500 pressure ratings with 15,000+ tonnes per year capacity and 100% ultrasonic testing coverage. All components are 100% PMI verified and solution annealed at 1900°F for chloride resistant performance in coastal desalination systems, offshore platform manifolds and heavy acid tower closures.
What Makes Our Stainless Steel Blind Flange Superior for Critical Flow Isolation?
The product serves as the ultimate pipeline termination component for systems requiring absolute flow blockage combined with extreme corrosion resistance. This marine-grade solution contains 2.0-3.0% molybdenum compared to the usual carbon steel options and a strictly regulated extra-low carbon matrix (0.030% max).
This particular chemistry provides a safeguard against the formation of hazardous chromium carbides during welding and long-term exposure to harsh media. The solid plate design assures no downstream flow of the valve when it is required to be permanently or temporarily closed. The dual-grade certification means the valve is manufactured to both high-strength (F316) and improved weldability (F316L) criteria.
Each blind flange is produced by state-of-the-art closed-die press forging to provide a seamless solid core matrix without internal cavities or metallurgical imperfections. Following this is a solution annealing treatment at 1900°F which recovers the optimum alloy balance and eliminates residual stresses by quick water quenching.
Your piping system benefits from superior resistance to localized pitting and crevice corrosion in chloride-rich environments. The machined sealing face accommodates various gasket types, including raised face (RF), flat face (FF), and ring type joint (RTJ) configurations for specialized high-pressure applications.
Technical Specifications & Dimensional Standards of ASME B16.5 ASTM A182 F316 F316L Blind Flange
| Parameter | Specification Details |
|---|---|
| Manufacturing Standard | ASME B16.5 / ASTM A182 / EN 1092-1 / ASME B16.47 |
| Product Type | Forged Blind Flange (BL) / Marine Grade Blanking Plate |
| Material Grade | F316 / F316L Dual Certified (UNS S31600 / S31603) |
| Size Range | 1/2" through 24" nominal bore |
| Pressure Class | Class 150, 300, 600, 900, 1500, 2500 |
| Flange Face Options | Raised Face (RF) / Flat Face (FF) / Ring Type Joint (RTJ) |
| Manufacturing Process | Closed Die Forging / CNC Bolt Hole Drilling / Precision Machining |
| Heat Treatment | Solution Annealing + Rapid Water Quenching |
| Surface Finish | Acid Pickled Passivated / Machined Concentric Grooves |
| Tensile Strength | Minimum 515 MPa |
| Yield Strength | Minimum 205 MPa |
| Chemical Composition | Cr 16.0-18.0% / Ni 10.0-14.0% / Mo 2.0-3.0% / C ≤0.030% |
| Testing Protocol | 100% Ultrasonic Testing (UT) / Liquid Penetrant Test (PT) / PMI Verification |
| Quality Certificates | EN 10204 3.1/3.2 MTC / ISO 9001:2015 / PED Certified |
| Third-Party Inspection | SGS / BV / TUV / DNV / ABS Accepted |
| Packaging | Individual Polyethylene Sleeves / Fumigated Wooden Crates / Hard Plastic Face Caps |
Core Performance Advantages for Demanding Applications
Material & Functional Superiority
This ASME B16.5 ASTM A182 F316 F316L Blind Flange is made from a molybdenum infused alloy matrix that has excellent resistance to pitting and crevice corrosion when exposed to chloride rich saltwater and acidic chemical conditions for extended periods of time. As the very low carbon (< 0.03%) concentration, there would be no sensitisation during heat processing.
Your offshore facilities are structurally more resilient even when subjected to high temperature variations from cryogenic LNG systems (-196°C) to hot steam lines. PREN (Pitting Resistance Equivalent Number) is above 24, offering quantitative protection for demanding maritime atmospheres.
Production Quality & Testing Rigor
Every production batch undergoes comprehensive quality verification protocols aligned with international pressure equipment directives. Our manufacturing process includes vertical furnace solution annealing followed by controlled cooling cycles to optimize grain structure.
Before shipment approval, technicians perform 100% non-destructive volumetric examination using calibrated ultrasonic flaw detection equipment. Additional liquid penetrant testing reveals any surface discontinuities invisible to visual inspection. Positive Material Identification (PMI) guns verify precise alloy composition on every component.
Versatile Customization & Engineering Flexibility
Beyond standard ASME B16.5 dimensional specifications, we accommodate custom thickness increments for specialized pressure requirements. Your unique project demands receive expert technical support including CAD drawing verification and stress calculation assistance.
Custom surface treatments include specialized RTJ groove machining for metal-to-metal sealing applications. Batch identifier stenciling and protective hard plastic face caps ensure traceability throughout your supply chain. Our engineering team can design flanges matching alternate international codes including EN 1092-1 and MSS SP-44 standards.
Critical Industrial Applications
Offshore Oil & Gas Terminal Sealing
Subsea manifolds and topside piping systems demand absolute leak-proof integrity where saltwater exposure and high-pressure hydrocarbon flow create severe corrosion challenges. The ASME B16.5 ASTM A182 F316 F316L Blind Flange provides reliable permanent or temporary closure for inspection ports, maintenance access points, and future tie-in locations.
Chemical Processing Flow Isolation
Reactor systems handling sulfuric acid, hydrochloric acid, and organic solvents require materials capable of withstanding aggressive chemical attack. The molybdenum content specifically targets chloride-induced stress corrosion cracking while the forged solid construction eliminates potential leak paths.
Marine Desalination Systems
Coastal water treatment facilities processing high-salinity feedwater benefit from the superior chloride resistance inherent in the F316L grade. Pipeline terminal points and inspection manhole covers maintain hermetic seals despite continuous exposure to brine solutions and marine atmospheric corrosion.
Quality Assurance & Documentation
We have a thorough quality management system in four stages and is ensuring that each product satisfies strict international specifications. The first step in raw material verification is spectrographic examination verifying chromium, nickel and molybdenum ratios. Production monitoring comprises real time dimensional inspection & heat treatment oversight.
Mechanical qualities tested by independent laboratory including verification of tensile strength and intergranular corrosion resistance testing in accordance with ASTM A262 Practice E. Final inspection procedures verify product marking correctness and package integrity prior to logistics coordination. Documentation packages are completed with EN 10204 3.1/3.2 Mill Test Certificates, PMI reports and dimensional inspection records.
FAQ
Q：Why is this marine-grade product technically preferred for corrosive terminal sealing?
A：This blind flange integrates crucial molybdenum content with an extra-low carbon threshold, delivering premium long-term chemical protection against localized pitting and intergranular crevice failures along severe high-pressure isolation blocks.
Q：How does the low-carbon matrix respond under volatile bolted terminal fluid stagnation?
A：By dropping carbon metrics below 0.03%, it effectively prevents hazardous chromium carbide precipitation and stress-corrosion cracking during prolonged contact with marine mist or acidic media, preserving structural plate integrity.
Q：What strict non-destructive volumetric criteria must the solid plate body successfully clear before shipping approval?
A：The entire batch undergoes 100% mandatory non-destructive testing, passing through solid-center ultrasonic flaw detection (UT), liquid penetrant checks (PT), and micro-calibrated dimensional laser profile mapping.
Q：Can the blanking face texture be customized to facilitate advanced gasket sealing layouts?
A：We support extensive custom finishing options, allowing for tailored Ring Type Joint (RTJ) grooves or standard stock finish phonographic concentric grooves finish according to ASME B16.5 criteria.
Q：What robust packaging protocols protect this premium blind flange lot from transit humidity during maritime freight?
A：The components are wrapped individually with protective foam bag sleeves, padded with fiber edge shielding, or packed inside secure plywood crates with hard plastic face protectors to secure flawless delivery.
Contact Us
Ready to secure premium blind flanges for your critical piping project with the ASME B16.5 ASTM A182 F316 F316L Blind Flange? Contact our technical team at info@hballtrust.com for detailed quotations, custom engineering support, and fast delivery solutions.
