Medical / Gr5 ELI
Direct Mill Inventory & Engineered Hardware
Featured Titanium Flanges, Blocks, Machined Valves & Fasteners
From forged billets and pressure vessel components to precision CNC turned components, inspect our high-integrity metallurgical line engineered to ASTM, ASME, DIN, and ISO specifications.
Anodizing / Gr2
ASTM F136 / Gr23
Custom / Gr2 Rack
ANSI Ball Valve
Anodizing Jig
CP-Ti Sports
Fasteners / DIN 912
2006
Established in Baoji
19+
Years Global Export
100T
Annual Mill Output
9 Engineers
4 Senior / 5 Intermediate
EN 10204
3.1 / 3.2 MTC Certified
≤ 8h
Engineering Response
Strategic Sourcing Direct From Baoji Valley
Engineering Integrity in Titanium Slip-On Flange Fabrication
Within high-consequence fluid handling—ranging from offshore seawater desalination piping to aggressive chlor-alkali chemical processing—the Titanium Slip On Flange (SO Flange) serves as a pivotal mechanical interface. Slip-on flanges slide directly over the outer diameter of the pipe spool and are secured via two fillet welds (one external and one internal). This design minimizes alignment error, lowers field fabrication labor costs, and provides an economically balanced alternative to full butt-welded Weld Neck (WN) flanges.
Founded in 2006 in Baoji, Shaanxi—globally recognized as "China's Titanium Valley"—Jovzi Titanium Industry Co., Ltd. capitalizes on an integrated regional supply chain. We maintain strict control over vacuum arc remelting (VAR), precision free-forging, die-forging, and 5-axis CNC machining workflows. Supported by our metallurgical engineering team (comprising 4 senior metallurgists and 5 intermediate mechanical engineers), every Jovzi titanium slip-on flange is precision-forged in strict conformance with ASME B16.5, ASTM B381, DIN EN 1092-1, and JIS B2220 standards.
Verified Traceability: Every batch is backed by EN 10204 3.1 Mill Test Certificates (MTC) stating exact chemical composition, Charpy impact toughness, and tensile performance verified through the authoritative national BaoTi Test Center.
- Optimized Bore Geometries: Internal bore tolerances tightly controlled to ±0.25mm (+0.010 in) to guarantee uniform fillet weld penetration without localized pipe necking.
- ASME B16.5 Raised Face (RF) Serration: Concentric or spiral serrated finishes precisely cut to 125–250 μin (Ra 3.2–6.3 μm) for positive gasket grip and leak-tight joint sealing.
- Thermal Stress Relief: Vacuum annealing protocols eliminate work-hardening stress, preventing stress-corrosion cracking (SCC) in hot brine and sour-gas environments.
Baoji Facility CNC Machining Center: Precision facing, bolt-hole index drilling, and bore turning of ASME B16.5 Class 150/300 Titanium Slip On Flanges.
Metallurgical Selection Matrix
Titanium Grades for Slip-On Flange Applications
Selecting the correct titanium grade requires balancing mechanical tensile loads against chemical exposure factors, such as reducing acids, chloride crevice risks, and operating temperatures.
| Titanium Grade | UNS / Standard | Nominal Chemistry | Min. Tensile (MPa) | Yield Strength (0.2%) | Optimal Industrial Service Environments |
|---|---|---|---|---|---|
| Grade 1 (CP-4) | UNS R50250 / ASTM B381 F1 | Unalloyed CP-Ti (Low O) | 240 MPa | 170 MPa | Deep-drawn vessel linings, low-pressure chlorination, plate heat exchangers demanding extreme cold ductility. |
| Grade 2 (CP-3) | UNS R50400 / ASTM B381 F2 | Commercially Pure Ti | 345 MPa | 275 MPa | The workhorse for ASME B16.5 marine seawater cooling, FGD scrubbers, and industrial brine transport lines. |
| Grade 5 (Ti-6Al-4V) | UNS R56400 / ASTM B381 F5 | Ti-6% Al - 4% V | 895 MPa | 828 MPa | High-pressure subsea manifolds, lightweight offshore riser fittings, aerospace structural fluid couplings. |
| Grade 7 (Ti-Pd) | UNS R52400 / ASTM B381 F7 | Ti-0.15% Palladium | 345 MPa | 275 MPa | Severe reducing acids (HCl, H2SO4) and hot chloride crevice protection where CP Gr2 experiences localized breakdown. |
| Grade 12 (Ti-Mo-Ni) | UNS R53400 / ASTM B381 F12 | Ti-0.3% Mo - 0.8% Ni | 483 MPa | 345 MPa | High-temperature chemical processing, intermediate strength, elevated crevice resistance up to 300°C at moderate cost. |
Traceable Stockyard: ASTM B381 forging billets and ASTM B348 titanium round bars ready for closed-die flange forging and ring rolling.
Slip-On (SO) vs. Weld Neck (WN): When to Specify Slip-On
Industrial piping designers often debate between Slip-On Flanges and Weld Neck Flanges. While weld neck flanges feature a tapered hub designed for butt-welding (providing superior stress redistribution under high bending moments and cyclic vibrations), Slip-On flanges offer substantial procurement advantages in moderate-pressure fluid handling:
1. Dimensional Alignment Simplicity: Slip-On flanges allow field engineers to slide the flange over the pipe end, rotate it freely to match existing bolt-hole circles (PCD), and establish proper alignment before final welding.
2. Lower Raw Material Volume: Because slip-on flanges omit the lengthy forged conical hub of a weld neck flange, titanium raw material consumption is reduced by 25% to 40%. Given the premium cost of titanium alloys, this represents a major capital expenditure reduction on large-diameter lines (DN150 to DN600).
3. Dual Fillet Weld Distribution: When properly assembled per ASME Section IX with an internal seal weld and an external structural fillet weld, titanium slip-on flanges offer robust fatigue resistance against working pressures up to Class 300 and Class 600 systems.
Strategic Market Intelligence
Future Procurement Trends in Titanium Flange Sourcing
How global EPC contractors, chemical infrastructure groups, and procurement directors are restructuring supply chains to guarantee raw material purity, minimize scrap ratios, and mitigate geopolitical disruptions.
Near-Net-Shape Ring Rolling
Traditional flange machining from heavy solid plate resulted in scrap rates exceeding 65%, driving up unit costs. Modern procurement specifications now mandate seamless radial-axial ring rolling for slip-on flanges above 4 inches (DN100). This process creates a continuous tangential grain flow that boosts circumferential burst yield strength by 18% while lowering virgin sponge requirements.
Hedging Raw Sponge Volatility
With titanium raw sponge prices experiencing cyclical shifts driven by aerospace demand and aerospace scrap recovery, multinational engineering firms are migrating toward framework annual volume contracts. Direct partnerships with vertically integrated Baoji converters allow project buyers to lock in fixed billet conversion pricing, shielding piping projects from volatile raw material surcharges.
Stringent Non-Destructive Testing (NDT)
Procurement teams are shifting away from baseline visual inspections to mandatory third-party ultrasonic immersion testing (UT per ASTM A388 / AMS 2631 Class A) and liquid penetrant testing (PT per ASTM E165). This ensures internal ring forgings are free of center bursts, alpha-case brittle layers, or shrinkage cavities before costly overseas shipment.
Decarbonized & Low-Carbon Melt Audits
European and American green hydrogen projects now require verified carbon-intensity reporting across the titanium melt process. Chinese forging houses utilizing clean-power vacuum consumable arc melting (VAR) and closed-loop scrap recycling can deliver lower Scope 3 greenhouse gas footprints, helping EPC firms meet stringent corporate sustainability criteria.
Digital MTCs & Direct Mill Heat Stamping
Counterfeit tracking and grade mix-ups represent major hazards in multi-alloy projects. Future-ready procurement frameworks require direct laser or low-stress dot-matrix stamping on flange outer rims, coupled with cryptographically verifiable QR codes linking back to certified optical emission spectrometer (OES) chemical analysis logs.
Innovation & Engineering Trajectory
Technological Advancements in Titanium Flange Manufacturing
From micro-alloy additions to orbital automatic welding compatibility, explore how modern metallurgy is refining the durability and service life of titanium industrial piping connections.
1. Lean-Palladium & Ruthenium Modified Alloys
While Grade 7 (Ti-0.15Pd) offers exceptional resistance to crevice corrosion under low pH and elevated chloride conditions, the high cost of pure palladium can present budgetary hurdles. Emerging metallurgical standards are validating Grade 16 (low-Pd) and Grade 26 / Grade 27 (Ruthenium-modified titanium). These alloys deliver identical crevice passivity in boiling salt brines at roughly 40% lower precious-metal cost surcharges, making them practical for wide-scale slip-on flange deployment.
2. Ultra-High Precision 5-Axis CNC Facing
Traditional manual lathes often left minor chatter marks on flange sealing faces, which compromised sealing integrity with graphite or PTFE gaskets. Modern Chinese manufacturing utilizes high-torque, live-tooled 5-axis CNC machining centers. This delivers accurate phonographic spiral serration pitch and exact bolt-hole perpendicularity within ±0.05 mm, eliminating joint torque relaxation under thermal cycling.
3. Automated Orbital GTAW (TIG) Welding Compatibility
Because titanium oxidizes rapidly above 400°C, double-fillet welding of slip-on flanges requires complete inert gas trailing shields. Factories now provide flanges with optimized weld preps, chemical pickling, and clean bright surfaces (free of iron contamination), ensuring field welders achieve silver-white or straw-gold weld beads that comply with AWS D10.6 / ASME IX without porosity.
Metrology & Quality Inspection: Surface roughness verification, coordinate measuring (CMM), and pneumatic hydrostatic testing of machined titanium flanges prior to export packing.
Procurement Knowledge Base
Frequently Asked Questions: Titanium Slip-On Flanges
Detailed technical answers addressing mechanical, metallurgical, and international commercial requirements for project managers and procurement officers.
What manufacturing standards apply to titanium slip-on flanges?
Titanium slip-on flanges are primarily forged to ASTM B381 (Standard Specification for Titanium and Titanium Alloy Forgings) and dimensionally machined according to ASME B16.5 (Pipe Flanges and Flanged Fittings: NPS 1/2 through NPS 24 Metric/Inch Standard). For European projects, flanges are produced to EN 1092-1 Type 01 (Plate/Slip-On) or Type 12 (Hubbed Slip-On). For marine applications in East Asia, JIS B2220 (5K, 10K, 16K, 20K) is also widely supplied.
How do you prevent galvanic corrosion between a titanium flange and carbon/stainless steel counter-flanges?
Titanium has a noble galvanic potential. When coupled directly to stainless steel, copper alloys, or carbon steel in an electrolyte (such as seawater), it can accelerate galvanic attack on the mating metal. To isolate the joint, engineers must specify flange isolation gasket kits (Type F or Type E) featuring dielectric G10/G11 insulating retainers, PTFE/Viton spring-energized seals, mylar bolt insulating sleeves, and phenolic isolation washers to ensure complete electrical isolation.
Why choose Grade 2 titanium over Grade 5 for slip-on piping flanges?
Grade 2 Commercially Pure (CP) titanium provides an optimal balance of ductility (elongation ≥ 20%), ease of field weldability, and resistance to chloride pitting. Grade 5 (Ti-6Al-4V) delivers substantially higher yield strength (828 MPa vs. 275 MPa), but its reduced ductility and complex welding requirements (susceptibility to weld cracking and hardening) make it less practical for field double-fillet welds on slip-on designs unless required for extreme subsea pressure conditions.
What are the critical welding requirements for titanium slip-on flanges?
Titanium slip-on flanges require two fillet welds per ASME B31.3: one internal seal weld at the pipe end and one external structural weld at the flange hub base. Key welding controls include:
- Utilizing ultra-pure shielding gas (99.999% argon) for the primary torch, secondary trailing shield, and pipe interior purging.
- Maintaining interpass temperatures below 150°C (300°F) to prevent excessive interstitial absorption of oxygen, nitrogen, and hydrogen.
- Post-weld visual color check: Only silver-white or light straw colors are acceptable; dark blue, purple, or grey indicates atmospheric contamination, requiring weld cut-out and re-welding.
What documents are provided with export shipments?
Standard documentation includes an EN 10204 3.1 Inspection Certificate indicating exact heat numbers, full chemical breakdown (C, Fe, N, H, O, Ti balance), tensile test results (yield, ultimate tensile, elongation, reduction of area), and dimensional sign-off. On request, Jovzi supplies third-party test reports from the BaoTi Test Center, ultrasonic flaw inspection charts, dye penetrant certificates, and certificates of origin for customs clearance.
What is the Minimum Order Quantity (MOQ) and production lead time?
Because Jovzi maintains a standing inventory of ASTM B381 forged rings and ASTM B348 round bars, our MOQ for standard ASME B16.5 Gr2 slip-on flanges is 1 piece for common sizes (NPS 1/2" to 12" Class 150/300). For custom dimensions or special alloys (Gr7, Gr12), production lead times typically range from 15 to 25 working days, with urgent prototype orders dispatched via air within 7–10 days.
How are flange sealing faces protected during international sea transit?
Titanium is susceptible to mechanical surface scratching, which can damage the precision serrated raised face (RF). Every flange undergoes ultrasonic cleaning, application of clean protective oil, and installation of form-fitted plastic snap-on flange protectors or plywood blank covers. Flanges are then packed into foam-lined, heat-treated export wooden cases (complying with ISPM 15 standards) to prevent motion damage during ocean transit.
Can Jovzi supply custom dimensions or metric JIS/DIN flanges?
Yes. Supported by 4 senior and 5 intermediate mechanical engineers, we offer full OEM/ODM manufacturing based on client 2D CAD prints (PDF, DWG) and 3D models (STEP). We regularly produce non-standard thicknesses, custom pitch circles, metric DIN 2573/2576/2642/EN 1092-1 Type 01, JIS 5K/10K/20K flanges, and specialized titanium autoclaves and reactor connection ports.
Enterprise Core Competence
Why Global EPC Leaders Partner with Jovzi Titanium
From raw material ingot melting in Shaanxi to precision machining and international logistics, Jovzi provides dependable, verified manufacturing solutions.
ISO 9001 Certified System
Our quality management framework governs every production stage: raw material traceability, forging temperature oversight, CNC tool calibration, final surface roughness checks, and hydrostatic pressure testing.
Experienced Metallurgical Team
Our technical team—featuring 4 senior metallurgists and 5 intermediate engineers—reviews engineering prints, analyzes chemical corrosion conditions, and advises on optimal alloy selections to minimize lifetime project costs.
BaoTi National Testing Center
In addition to our in-house spectrometry and dimensional checks, all critical material lots can be submitted to the independent BaoTi Test Center for chemical verification, grain size analysis, and third-party mechanical tensile validation.
Global Trade Infrastructure
We export to clients in Germany, the United States, Japan, Canada, Belgium, and Southeast Asia. We support flexible payment methods (T/T, L/C, PayPal) and versatile Incoterms (FOB, CFR, CIF, DDP door-to-door).
Request an Engineering Quotation for Titanium Slip-On Flanges
Submit your piping schedules, drawing prints, required titanium grades, pressure classes (Class 150–1500), and quantity breakdowns. Our technical sales team will provide an itemized quote and MTC review within 8 working hours.