Gr2 Gr5 Titanium Blind Flange ASTM B381 ASME B16.5 Forged Titanium Flange

Опубликовано Engineering Team, Shaanxi Qianyi Tuoda Technology Co., Ltd от 2026-10-25

1. Core Parameters

• Material Grade: Gr1, Gr2, Gr5, Gr7, Gr12, Gr16, Gr17 Titanium
• Product Forms: Forged & CNC machined titanium blind flange
• Standards: ASTM B381, ASME B16.5, ASME B16.47, DIN, EN1092‑1, JIS
• Processing Method: Hot forging, heat treatment, CNC precision machining
• Target Industries: Chemical pipeline, salt‑lake lithium, offshore platform, pressure vessel auxiliary piping
• Lead‑time: Standard size stock 11‑18 working days; custom non‑standard forging 27‑43 working days

2. Product Definition

Titanium blind flange is a solid disc‑type pipeline fitting used to block pipe end or equipment nozzle opening. Unlike welding neck or slip‑on flange, blind flange performs complete closure function for pressure piping system. It is manufactured by hot forging followed by CNC machining to meet international flange dimension standards.

• By manufacturing process: Hot forged blind flange, machined from Titanium Plate (for low‑pressure condition)
• By structure & seal type: RF raised face, FF full face, RJ ring‑joint face blind flange

3. Material Advantage: Material‑Medium‑Corrosion‑Cleanliness

Different titanium grades are selected based on pipeline medium, pressure and temperature, to avoid flange face corrosion causing leakage risk at bolted joint.

• Gr1/Gr2 pure titanium: Excellent performance in seawater, chloride brine, neutral salt medium, fit for general‑purpose chemical blocking condition.
• Gr5 Ti‑6Al‑4V alloy: Higher mechanical strength, suitable for high‑pressure pipeline end closure under medium corrosion environment.
• Gr7 / Gr12: Selected for medium reducing acid and hot brine where pure titanium suffers crevice corrosion risk.
• Surface cleanliness: Forging scale fully removed during CNC machining; sealing face free of iron contamination, scratch and burr to guarantee gasket sealing performance.

4. Technical Standards

• Material standard: ASTM B381 (titanium forgings)
• Flange dimension standards: ASME B16.5, ASME B16.47, EN1092‑1, DIN, JIS B2220
• Pressure‑vessel reference: Compatible with ASME B31.3 process piping requirement
• Documentation: EN10204 3.1 MTC for forging; dimension inspection report; NDT record for critical pressure project orders.

5. Full Manufacturing Workflow: From Drawing To Finished Goods

1. Raw material inspection: Verify titanium billet chemical composition and surface condition before forging.
2. Hot die forging: Form rough flange blank under high temperature to optimize internal grain structure.
3. Heat treatment: Annealing treatment to eliminate forging residual stress, stabilize mechanical performance.
4. Rough & finish CNC machining: Process OD, bolt hole, sealing face, thickness strictly per standard dimension.
5. Deburr all edges; remove machining chips from bolt holes.
6. Visual inspection & dimensional verification for sealing surface and bolt pitch circle.
7. Anti‑rust protection, marking grade, standard, class; export‑ready wooden case packaging.

6. Key Component Performance

• Sealing face performance: Strict surface flatness control; scratches on sealing face are forbidden to prevent medium leakage under pressure.
• Non‑destructive test: Ultrasonic test for forging internal defects; magnetic particle inspection optional for high‑class pressure flanges.
• Welding performance: If field modification needed, adopt argon‑shield welding to avoid oxidation embrittlement.
• Bolt hole precision: Bolt‑hole position tolerance controlled to ensure on‑site bolt assembly smoothness.

7. Application Industry — Medium‑Equipment‑Process

• Chemical process piping industry
  • Medium: Chloride brine, dilute corrosive process fluid
  • Equipment & parts: Pipeline end blocking flange for reactor auxiliary nozzle
  • Process: Bolt assembly with gasket, pressure test before system commissioning
• Salt‑lake lithium extraction project
  • Medium: High‑temperature concentrated brine
  • Equipment & parts: Blind flange for evaporation tank piping outlet
  • Process: Site installation, periodic dismantling for equipment maintenance
• Off‑shore & marine industry
  • Medium: Seawater, coastal salt spray
  • Equipment & parts: Auxiliary pipeline closure for offshore module
  • Process: Pre‑assembly on‑land, long‑term outdoor pressure‑resistant service

8. Selection Reference Table

Selection Type	Scenario	Suggested Option
Material‑based selection	General chloride medium, medium‑low pressure	Gr2 Forged Blind Flange
Material‑based selection	High‑pressure piping system	Gr5 Ti‑6Al‑4V Blind Flange
Seal‑face selection	Most common general‑purpose pipeline	RF Raised Face Blind Flange
Seal‑face selection	High‑pressure hazardous medium pipeline	RJ Ring‑Joint Face Blind Flange

9. Customizable Items & Accessories

• Custom service: Non‑standard diameter, special pressure‑class, custom bolt hole layout per drawing.
• Surface options: As‑machined surface, passivation treatment for anti‑corrosion enhancement.
• Auxiliary service: Special marking, matching gasket recommendation, wooden export packing.

10. Lead‑Time, Test Report & Warranty

• Standard size stocked forgings:11‑18 working‑days after order confirmation.
• New custom forging production:27‑43 working‑days, subject to forging mould complexity.
• Delivery documents: Mill Test Certificate, dimension inspection report, NDT record for high‑pressure orders, batch traceability.
• Quality warranty: Forging and dimension comply with ordered standard; quality claim accepted within receiving inspection period.

Why Choose SXQYTD

SXQYTD supplies multi‑grade forged titanium blind flange following ASTM B381, ASME B16.5 and other global standards. Our Titanium Fittings are exported to USA, Europe, Southeast Asia and Middle East chemical projects. Send your drawing or specification for quotation.

Website: www.sxqytd.com

Contact us for your titanium project inquiry.