Description
Product Detail
A zirconium blind flange is a non-bored flange designed to seal the end of a piping line, vessel opening or equipment nozzle where future inspection, maintenance or system expansion may be required. Because zirconium offers outstanding resistance to many organic acids, alkalis and chloride-bearing media, these blind flanges are widely selected for chemical processing, acetic acid production, pharmaceutical plants, offshore systems and specialty corrosive services.
SASA FLANGE supplies forged and machined zirconium blind flanges in standard and custom dimensions with strict process control. Available documentation and inspection include chemical analysis, mechanical testing, dimensional inspection, PMI testing, EN 10204 3.1 certificate and full heat number traceability. Custom drilling, special facing and non-standard thicknesses can be produced to suit project drawings and service requirements.
- ✓Product Name: Zirconium Blind Flange
- ✓Material Grade: ASTM B493 UNS R60702 / R60705
- ✓Product Type: Solid forged blind flange for pipeline and nozzle closure
- ✓Main Feature: Excellent corrosion resistance in organic acids, chlorides and high-purity process media
- ✓Applications: Chemical processing, acetic acid plants, pharmaceutical systems, offshore and specialty corrosive piping
Product Parameters
| Product Name | Zirconium Blind Flange |
| Material Grade | ASTM B493 UNS R60702, ASTM B493 UNS R60705 |
| Material Type | Zirconium alloy forging |
| Product Form | Blind flange, solid flange, forged and CNC machined |
| Size Range | DN15 – DN1200 (1/2 inch – 48 inch) |
| Pressure Class | Class 150 – 1500 / PN10 – PN100 |
| Sealing Face | RF, FF, RTJ, TG, MFM |
| Surface Treatment | Pickled, machined finish, passivated, cleaned and protected for export |
| Standard | ASME B16.5, ASME B16.47, EN 1092-1, DIN, JIS B2220, GB/T 9119 or customer specification |
| Inspection | Chemical Analysis, Mechanical Test, PMI Test, Dimensional, Hydrostatic |
| Certificate | EN 10204 3.1 Material Certificate available |
| Processing Service | Cutting, CNC Machining, Custom Drilling, Custom Size Processing |
Chemical Composition
The following chemical composition is for reference for common zirconium blind flange grades. Actual chemistry may vary slightly by grade, melting route and applicable ASTM specification. Final delivered composition is subject to the relevant material standard and confirmed by the mill test certificate and inspection records supplied with the order.
| Element | C | Si | Mn | P | S | Cr | Ni | Mo | Other |
|---|---|---|---|---|---|---|---|---|---|
| UNS R60702 | 0.05 max | 0.05 max | 0.05 max | 0.015 max | 0.015 max | – | – | – | Zr+Hf 99.2 min, Hf 4.5 max, Fe+Cr 0.20 max, H 0.005 max, N 0.025 max, O 0.16 max |
Mechanical Properties
Mechanical properties of zirconium blind flanges depend on grade, forging reduction, annealing condition and section thickness. The values below are typical reference figures for annealed zirconium forgings used for flange production. Final mechanical test results are shown on the material certificate and may vary within the limits of the applicable material specification.
| Grade | Tensile Strength | Yield Strength | Elongation | Hardness | Density |
|---|---|---|---|---|---|
| UNS R60702 | 380 MPa min | 205 MPa min | 16% min | 200 HB max | 6.51 g/cm3 |
| UNS R60705 | 515 MPa min | 345 MPa min | 16% min | 235 HB max | 6.56 g/cm3 |
Common Size Table
| Size Range | Pressure Class | Sealing Face | Material | Availability |
|---|---|---|---|---|
| DN15 – DN50 | Class 150 – 600 | RF | R60702 / R60705 | Stock / Production |
| DN65 – DN300 | Class 150 – 1500 | RF / RTJ | R60702 / R60705 | Stock / Production |
| DN350 – DN600 | Class 150 – 900 | RF / RTJ | R60702 / R60705 | Production |
| DN700 – DN1200 | Class 150 – 600 | RF / FF | R60702 | Made to Order |
Different Specifications Comparison
| Type | Description | Typical Use |
|---|---|---|
| ASME B16.5 Blind Flange | Forged blind flange for NPS 1/2 to 24 with imperial dimensions and pressure classes | Process piping, chemical plants and refinery lines |
| ASME B16.47 Blind Flange | Large diameter blind flange for NPS 26 to 60 in Series A or Series B | Large pipelines, storage terminals and offshore facilities |
| EN 1092-1 Type 05 | European blind flange with PN rating and metric dimensions | European projects, water, chemical and utility systems |
| DIN / JIS / GB Blind Flange | Regional blind flange formats with different drilling and thickness requirements | Replacement jobs, OEM equipment and domestic market standards |
Equivalent Standards and International Names
Blind flange dimensions are produced to international flange standards, while zirconium material grades are usually specified by ASTM UNS designation. Equivalent naming in regional standards may differ, so dimensional standard and material standard should both be confirmed during procurement. SASA FLANGE can match project specifications, drawings and end-user approved grade requirements.
| Standard / Region | Standard Code | Typical Grade / Equivalent |
|---|---|---|
| USA | ASME B16.5 / ASME B16.47 | ASTM B493 UNS R60702 / UNS R60705 |
| Europe | EN 1092-1 | Zirconium blind flange to customer material spec, commonly UNS R60702 |
| Germany | DIN 2527 / 2566 | Zirconium blind flange machined to DIN dimensions from ASTM B493 forging |
| Japan | JIS B2220 | Zirconium blind flange in JIS drilling with UNS R60702 / R60705 material |
| China | GB/T 9119 | Zirconium blind flange with ASTM B493 or agreed enterprise specification |
Production Process Flow
Manufacturing control is critical for zirconium flanges because material cleanliness, forging practice and machining quality directly affect corrosion performance and sealing reliability. SASA FLANGE maintains full traceability through each production stage.
- 1. Raw Material Selection
- 2. Forging / Cutting
- 3. Heat Treatment
- 4. Rough Machining
- 5. Finish Machining
- 6. Drilling
- 7. Surface Treatment
- 8. Inspection
- 9. Marking
- 10. Packing
- 11. Delivery
| Process Step | Description | Quality Control Point |
|---|---|---|
| Raw Material | Select certified zirconium forging billets or rolled plate for machining | Material certificate and traceability |
| Forging | Hot forging to achieve required shape | Forging temperature and reduction ratio |
| Heat Treatment | Annealing after forging or machining as required | Temperature and holding time control |
| Machining | Sealing face, bolt holes, dimensions | Dimensional accuracy and surface finish |
| Inspection | Final inspection before shipment | Dimension, surface, PMI, hydrostatic |
Product Inspection
1. Chemical Composition Inspection
Chemical composition inspection is performed to verify the zirconium grade conforms to ASTM requirements for UNS R60702 or R60705. Spectrometric analysis and review of mill data confirm control of Fe, Cr, Hf, oxygen, nitrogen and hydrogen limits. This ensures the flange material has the required corrosion resistance and suitability for aggressive chemical process environments.
2. Mechanical Properties Testing
Mechanical testing confirms the flange forging meets specified tensile strength, yield strength, elongation and hardness requirements. Test coupons are evaluated according to the applicable material standard and heat treatment condition. These checks help ensure the blind flange has adequate strength for bolted closure service while retaining the ductility needed for safe installation and operation.
3. Dimensional Inspection
Dimensional inspection covers outside diameter, thickness, bolt circle, bolt hole diameter, facing dimensions, raised face height and overall flatness. The sealing surface finish is checked to match the gasket requirement of RF, FF or RTJ design. This inspection is essential for proper alignment, leak-tight assembly and interchangeability with mating flanges made to international standards.
4. PMI Testing and Hydrostatic Testing
PMI testing is carried out to confirm positive identification of zirconium alloy grade and to avoid mixed-material risk during production and packing. When specified, hydrostatic or assembly pressure verification is performed at system level or as project requirement. SASA FLANGE provides EN 10204 3.1 certificate, inspection reports and heat number traceability for complete documentation.
Product Packaging
- ✓Wooden Case Packaging: Suitable for high-pressure and large-diameter products
- ✓Pallet Packing with Shrink Wrap: Suitable for batch shipments and standard sizes
- ✓Anti-rust Oil Coating + Waterproof Paper: Used for ocean freight protection
- ✓Individual Plastic Bag + Carton: Used for small fittings and threaded products
- ✓Clear Marking: Grade, size, pressure class, heat number and PO number
Applications
Zirconium blind flanges are selected where pipeline ends or vessel nozzles must be securely closed in corrosive process conditions. Their excellent resistance to many acids and chemical media makes them suitable for demanding industrial systems that require long service life, low contamination risk and reliable sealing performance.
| Industry | Typical Applications | Why This Product Is Used |
|---|---|---|
| Oil and Gas | Produced water units, offshore chemical injection systems, specialty corrosive service lines | Provides reliable end closure with strong resistance to chloride-containing and aggressive media |
| Chemical Processing | Acetic acid plants, organic chemical lines, reactor nozzles, storage and transfer piping | Zirconium offers excellent corrosion resistance and low contamination in severe chemical service |
| Power Generation | FGD chemicals, specialty dosing systems, auxiliary corrosive process lines | Used where alloy stability and long service life are required under plant operating conditions |
| Water Treatment | High-purity chemical dosing, brine systems and aggressive treatment chemical pipelines | Reduces corrosion risk and supports clean, durable sealing in critical treatment systems |
| Marine and Offshore | Offshore skids, desalination-associated chemical systems and seawater-adjacent process units | Suitable for harsh environments where corrosion resistance and maintenance reduction are important |
Why Choose SASA FLANGE?
- ✓Professional manufacturer of Blind Flanges for global industrial projects
- ✓Customized size, pressure class and material grade according to drawings
- ✓Full standard support: ASME, EN, DIN, JIS, GB, GOST and customer specifications
- ✓Material traceability with heat number control and EN 10204 3.1 material certificate
- ✓Chemical analysis, mechanical testing, PMI testing, hydrostatic and dimensional inspection
- ✓Stock availability for standard items, lead time 3-7 days; custom production 15-30 days
- ✓Export-grade packaging for sea, air and land transportation
- ✓15+ years experience supplying 50+ countries worldwide
FAQ
Q: What is a zirconium blind flange?
A: A zirconium blind flange is a solid, non-bored flange used to close the end of a pipe, valve connection or vessel nozzle. It is bolted to a mating flange with a gasket to create a pressure-tight seal. Zirconium is chosen when the service medium is highly corrosive and standard stainless steel or nickel alloys may not provide sufficient resistance.
Q: What materials are available for zirconium blind flanges?
A: SASA FLANGE commonly supplies zirconium blind flanges in ASTM B493 UNS R60702 and UNS R60705 grades. These materials are selected based on corrosion conditions, strength requirement and project specification. For cost-sensitive applications, zirconium-clad carbon steel options may also be discussed where the design and service conditions allow the use of composite construction.
Q: What pressure class is supported?
A: Zirconium blind flanges are typically supplied in ASME Class 150, 300, 600, 900, 1500 and selected project-driven sizes, as well as EN and DIN PN ratings such as PN10 to PN100. The actual available pressure class depends on size, material availability and design standard. SASA FLANGE can review drawings and confirm suitable thickness and facing details.
Q: Can SASA FLANGE supply custom sizes?
A: Yes. SASA FLANGE can manufacture custom zirconium blind flanges to drawings or end-user specifications. Services include special OD and thickness, custom drilling, RF, FF, RTJ or other facing configurations, non-standard bolt patterns and project-specific marking. We can also match ASME, EN, DIN, JIS and GB dimensions or produce mixed-standard designs for replacement applications.
Q: What certificate is provided?
A: SASA FLANGE can provide EN 10204 3.1 material certificate together with the mill test certificate, heat number traceability and dimensional inspection records. On request, PMI reports, chemical analysis, mechanical test results and other project documentation can also be supplied. Hydrostatic or additional inspection requirements may be arranged according to purchase order and project specification.
Contact Us
If you are looking for zirconium blind flange or related custom flange products, please contact SASA FLANGE with your required size, pressure class, material grade, standard, surface treatment, quantity and inspection requirements. Our team will provide professional technical solutions and competitive quotation within 24 hours.
- 📧 Email: sales@sasaflange.com
- 📱 WhatsApp: +86 13764965049
- ☎️ Tel: +86 21 52236361
- 🌐 Website: www.sasaflange.com
