Titanium Materials for Marine Engineering
Marine engineering exposes metals to chloride-rich seawater, splash zones, biofouling, stagnant water pockets and long maintenance intervals. Titanium is selected when corrosion allowance, coating maintenance or premature failure of stainless steel becomes a cost or reliability problem. For overseas buyers, the material decision usually depends on seawater temperature, flow condition, crevice risk, design pressure, fabrication method and inspection requirement.
Beiyu supplies titanium mill products and titanium components for marine-related equipment, including tube, pipe, plate, fasteners, flanges, valves, pump parts, tube sheets and custom machined parts. The most common grades for seawater service are Grade 2 and Grade 7, while Grade 12 may be selected for some higher-temperature or more demanding chloride environments. Final grade selection should follow the engineering design and the buyer’s corrosion assessment.
Typical Marine Applications
Titanium is used in seawater heat exchangers, condensers, desalination equipment, offshore piping, pump and valve components, fasteners, flanges, pressure vessel internals, marine sensors and underwater assemblies. Grade 2 titanium tube is common in condenser and heat exchanger service because it offers a practical combination of corrosion resistance, formability and weldability. Grade 7 titanium, with palladium addition, is considered where improved crevice corrosion resistance is required. Titanium fasteners can reduce corrosion problems in assemblies where galvanic compatibility and long-term exposure are concerns.
Relevant Product Forms
- Titanium tube and pipe for seawater heat exchangers, condensers and process lines.
- Titanium sheet and plate for liners, covers, baffles, tank parts and fabricated equipment.
- Titanium flanges, fasteners and pipe fittings for marine piping assemblies.
- Titanium pump and valve products for corrosive seawater and chemical service.
- Precision machined parts for custom marine hardware and equipment components.
Standards and Engineering Notes
Marine RFQs often reference ASTM B338 for titanium tubes, ASTM B861 or ASTM B862 for pipe, ASTM B265 for sheet and plate, ASTM B381 for forgings and ASTM B348 for bar. Pipe fittings may reference ASTM B363, while flanges and forged components may require drawings or project specifications. For heat exchanger tube, buyers should define outside diameter, wall thickness, length, tolerance, delivery condition, eddy-current or hydraulic testing requirement and packing method.
Design details matter in seawater service. Stagnant crevices, deposits, narrow gaps and mixed-metal assemblies can change corrosion performance. When titanium is used with other metals, the design should consider galvanic effects and insulation where needed. Welded assemblies should define filler wire grade, weld inspection and cleaning requirements. For tube sheets and machined components, drawings should specify hole tolerance, surface roughness, flatness and whether cladding or solid titanium is required.
Procurement and Inspection
Marine projects often require heat number traceability, mill test certificate, dimensional inspection and packing documents. EN10204 3.1 can be discussed if required by the purchase specification. PMI testing, ultrasonic testing, pressure testing or third-party inspection should be stated before quotation when required. For long tubes, straightness, end protection and bundle packing are important because export handling can damage thin-wall products if packing is not planned correctly.
Lead time depends on grade, size, quantity, product form and whether the item is standard mill product, cut-to-size material, welded fabrication or machined component. Standard Grade 2 tube may be simpler to quote than Grade 7 or Grade 12 custom parts. Large flanges, tube sheets and machined pump parts should be quoted from drawings because raw material, machining allowance and inspection scope drive cost.
RFQ Information
For marine engineering quotations, send the application, grade, standard, size, quantity, pressure or temperature requirement if relevant, drawing files, surface condition, inspection requirement and documents needed for import. If the application involves seawater, mention whether service is flowing seawater, stagnant seawater, brine, splash zone, offshore exposure or mixed chemical service. That information helps determine whether the RFQ should be treated as common Grade 2 supply or a more specific corrosion-resistant titanium requirement.
Service Environment Details
Marine titanium purchasing should include more than the word “seawater.” Flowing seawater, stagnant seawater, warm brine, offshore splash exposure and mixed chemical seawater can create different risks. The buyer should identify whether the part is continuously immersed, intermittently wetted, located near a gasketed joint or exposed to deposits. This information helps determine whether Grade 2 is enough or whether Grade 7, Grade 12 or a different design approach should be considered by the engineer.
For marine heat exchanger and condenser work, tube quality and packing are especially important. Thin-wall titanium tube can be damaged by poor bundling or unsupported export packing. Tube ends should be protected when required, and bundles should be labelled clearly by grade, size, heat number and quantity. For flanges, fasteners, valves and pump parts, drawings or standards should define connection dimensions, pressure class, thread type and sealing faces. Marine projects are often maintenance-driven, so correct identification and packaging can be as important as the material itself.
For replacement marine parts, include the existing equipment model, original material if known, operating water condition and any failure photos. This helps separate a simple dimensional replacement from a corrosion-driven material upgrade.