TITANIUM HEAT-TRANSFER TUBING
Titanium Grade 2 Heat-Exchanger and Condenser Tubes
Technical sourcing of commercially pure titanium tubing by grade, manufacturing route, outside diameter, wall, length or U-bend geometry, testing and inspection documents.
MNK-G.S.A develops each inquiry from the customer’s equipment and service specification. Grade 2, UNS R50400 and the commonly referenced material number 3.7035 help identify the material family, but the ordered tube is controlled by its product standard, manufacturing route, condition, dimensions, tests and acceptance documents.
Grade 2 Identity and Product Scope
- Titanium Grade 2 / UNS R50400 identifies a commercially pure titanium grade used in corrosion-resistant industrial equipment.
- 3.7035 is a commonly published European material-number reference for Grade 2. It is retained as an inquiry-matching designation, not as proof that a tube conforms to a current European product standard.
- ASTM B338-17(2026) includes Grade 2 within its tube specification for condensers, evaporators and heat exchangers.
- Grade 2H uses the same UNS identity but adds a higher guaranteed minimum tensile strength within ASTM B338. The standard permits Grade 2H to be certified as Grade 2; ordinary Grade 2 must not be assumed to satisfy Grade 2H.
- Tube, pipe, sheet, plate, bar and welding filler are different product scopes. A certificate for one form does not establish compliance for another.
MNK does not treat a commercial “Ti Grade 2 tube” description as a complete purchase specification. The route, standard, condition, dimensions and agreed inspection plan must appear together in the order.
Standards by Manufacturing Route
| Reference | Relevant scope | Procurement boundary |
|---|---|---|
| ASTM B338-17(2026) | Seamless and welded titanium and titanium-alloy tubes for condensers and heat exchangers | Confirm exact grade, seamless or welded route, condition, dimensions and ordered tests |
| ISO 18762:2016 | Welded titanium and titanium-alloy tubes for condensers and heat exchangers | Applies to the welded route only; the ISO record is under systematic review, so status and edition are rechecked at quotation |
| EN 10204:2004 | Inspection-document types for metallic products | Defines the requested document route; it is not a titanium tube product specification |
| DIN 17861:1990-11 | Historical seamless circular titanium-tube delivery reference | DIN Media marks it withdrawn; use only when a customer names the historical document and the acceptance route is agreed |
A design code, pressure-equipment requirement, tube-sheet specification or project document may add further controls. MNK verifies these alongside the product standard instead of treating a material designation as equipment approval.
Typical Manufacturing and Sourcing Range
A current specialist Grade 2 seamless-tube programme publishes the principal range below. It demonstrates one established manufacturing route and is not presented as MNK stock or a universal market limit.
| Product form | Typical published specialist range | Notes |
|---|---|---|
| Grade 2 seamless tube | Approximately 9.5–24.4 mm OD | Other diameters may be quoted for a specific project |
| Wall thickness | Approximately 0.07–4 mm | Availability depends on OD, reduction route, condition and tolerance |
| Straight length | Up to approximately 17 m within the cited programme | Maximum length is strongly dependent on OD, wall, route, handling and quantity |
| Welded tube | Project-specific dimensions | Quote by ASTM B338 or ISO 18762 route, strip source, weld processing, heat treatment and testing |
| U-bent tube | According to approved tube sheet and bend schedule | Confirm straight-leg lengths, tangent points, bend radius, thinning, ovality, heat treatment and inspection |
Combination rule: the smallest outside diameter, thickest wall and longest tube are not assumed to be available together. MNK confirms OD, wall, length, tolerance, condition, quantity and inspection as one manufacturable combination.
Straight, U-Bent and Replacement-Bundle Controls
Straight Tube
State cut or mill length, length tolerance, end squareness, surface condition, straightness, packing method and whether the tube must pass through an existing bundle-handling route.
U-Bent Tube
Provide the complete bend schedule, bend radius, leg lengths, tangent points, row identification, heat-treatment requirement, dimensional acceptance method and additional testing after bending.
Retubing and Replacement
Use the approved drawing, tube sheet, previous material certificate and measured schedule. MNK does not infer replacement geometry or grade from the equipment name alone.
Application Context and Selection Boundaries
- Seawater or chlorinated-water coolers
- Surface condensers, evaporators and heat exchangers
- Desalination and water-treatment equipment
- Offshore, marine and process-industry systems
- Refinery, petrochemical, pulp-and-paper and selected geothermal duties
These are application contexts, not automatic approvals. The process medium, concentration, temperature, pressure, velocity, solids, cleaning chemistry, galvanic couples, tube-sheet material, crevice geometry and design code must be reviewed together.
Manufacturer guidance also identifies important limits, including strong reducing acids, fluoride-bearing solutions, pure oxygen and anhydrous chlorine. Final suitability belongs to the customer’s engineering and approval process.
Inspection and Documentation
Material and Route
- Grade and UNS identity
- Seamless, welded or welded-and-cold-worked route
- Heat-treatment and surface condition
- Heat or lot traceability
Dimensional Inspection
- OD, wall and length reports
- Ovality, straightness and end condition
- Surface and cleanliness requirements
- U-bend geometry where applicable
Testing and Records
- Chemical and tensile results
- Flattening and reverse-flattening where required
- Hydrostatic, pneumatic, electromagnetic or ultrasonic examination as applicable
- Requested EN 10204 document type and supplementary reports
The authorised standard and purchase specification define the actual test sequence and acceptance criteria. This page provides an RFQ framework and does not reproduce protected requirements.
Titanium Tube RFQ Checklist
- Grade 2 / UNS R50400 or the exact customer-approved designation
- ASTM B338, ISO 18762 or another governing specification and edition
- Seamless, welded or welded-and-cold-worked manufacturing route
- Outside diameter, wall thickness, length and tolerances
- Straight or U-bent supply, with complete bend schedule where applicable
- Heat-treatment, surface, cleanliness and end requirements
- Testing, NDT, inspection-document type and third-party witness requirements
- Quantity, packing, destination and required delivery date
- Equipment drawing, tube sheet and process conditions where available
Related Technical Pages and Sources
MNK Routes
Source records establish scope, status and one published manufacturing example. The authorised standard, approved manufacturer data, purchase specification, certificate and project documents govern the actual order.
Send Your Titanium Tube Inquiry
Send the grade, standard, manufacturing route, OD, wall, length or U-bend schedule, quantity, testing, documents and delivery destination.
MNK-G.S.A | Industrial Procurement & Sourcing | mnkmetals.com | sales@mnkmetals.com