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Explore our most-specified titanium tube grades trusted by marine engineers and offshore operators globally.
The 1.75-inch (approximately 44.45 mm) outer diameter titanium tube has emerged as one of the most specified sizes in marine and offshore engineering procurement worldwide. Its dimensional profile fits seamlessly into standard heat exchanger configurations, seawater piping manifolds, and offshore structural assemblies, making it a critical component across upstream oil and gas, floating production storage and offloading (FPSO) vessels, submarine pipeline systems, and naval defense platforms.
Titanium's inherent resistance to chloride-induced corrosion — a primary degradation mechanism in marine environments — gives it a decisive advantage over stainless steel, duplex steel, and copper-nickel alloys. In seawater service at temperatures up to 260°C, commercially pure titanium grades and titanium alloys maintain their structural integrity indefinitely, eliminating the costly maintenance cycles and premature replacements that plague competing materials.
The global marine titanium market is experiencing robust growth. Driven by expanding deepwater exploration activities, the accelerating build-out of offshore wind energy infrastructure, and increasingly stringent environmental regulations governing marine corrosion inhibitors, demand for titanium tubing in marine and offshore applications is projected to grow at a compound annual growth rate (CAGR) of over 6.5% through 2030. The 1.75-inch tube size captures a disproportionate share of this demand due to its versatility across heat transfer, fluid conveyance, and structural applications.
Titanium forms a self-repairing passive oxide layer (TiO₂) that provides outstanding resistance to pitting, crevice corrosion, and stress corrosion cracking in chloride-rich seawater environments — even at elevated temperatures and velocities.
At roughly 60% the density of steel yet with comparable tensile strength, titanium tubes enable significant weight savings in offshore structures and vessels, directly reducing topside loads, fuel consumption, and structural fatigue.
Titanium tube installations in marine heat exchangers and condenser systems routinely achieve 30–50 year service lives with zero replacement, delivering lifecycle cost advantages that far outweigh initial material premiums over conventional alloys.
The non-reactive surface of titanium inhibits biofouling attachment, reducing the frequency of mechanical cleaning operations in seawater cooling systems and maintaining heat transfer efficiency over extended operational periods.
From cryogenic LNG applications at -196°C to high-temperature offshore process streams at 315°C, 1.75" titanium tubes maintain dimensional stability and mechanical properties across extreme thermal ranges encountered in marine operations.
Our 1.75" titanium tubes are manufactured and tested to ASTM B338, ASTM B861, ASME SB-338, DNV, and Lloyd's Register specifications, ensuring acceptance by major classification societies and offshore project certifiers.
| Parameter | Specification | Applicable Grade | Standard |
|---|---|---|---|
| Outer Diameter | 1.75 inch (44.45 mm) | Gr.1, Gr.2, Gr.7, Gr.9, Gr.12 | ASTM B338 / ASME SB-338 |
| Wall Thickness | 0.028" – 0.120" (0.71 – 3.05 mm) | All Grades | ASTM B338 |
| Length | Up to 20,000 mm (custom available) | All Grades | Per order requirement |
| Tensile Strength | 240 MPa (Gr.1) – 620 MPa (Gr.9) | Grade-dependent | ASTM B265 |
| Yield Strength | 170 MPa (Gr.1) – 483 MPa (Gr.9) | Grade-dependent | ASTM B265 |
| Density | 4.51 g/cm³ | All CP Grades | — |
| Max Service Temp (Seawater) | Up to 260°C | Gr.2, Gr.7 | NACE MR0175 |
| Surface Finish | Pickled, Bright Annealed, Polished | All Grades | Per specification |
| End Condition | Plain End, Beveled, Threaded | All Grades | Per order |
| Testing | Hydrostatic, Eddy Current, Ultrasonic | All Grades | ASTM E213 / E309 |
From subsea infrastructure to naval vessels, discover how 1.75" titanium tubing solves the most demanding engineering challenges in marine and offshore environments.
On floating production, storage, and offloading vessels, 1.75" titanium tubes are the standard choice for shell-and-tube heat exchangers handling seawater cooling of gas compression trains, crude oil stabilization units, and power generation systems. The tube's OD fits standard TEMA-specified tube sheets, while its corrosion immunity eliminates the tube bundle replacements that cost operators millions in unplanned downtime.
Monopile and jacket foundations for offshore wind turbines incorporate titanium hydraulic tubing for pitch control and yaw drive systems exposed to splash zone seawater. The 1.75" titanium tube withstands the combined attack of cyclic mechanical loading, UV radiation, and tidal seawater immersion that rapidly degrades stainless alternatives in North Sea and Asia-Pacific offshore wind deployments.
Multi-stage flash (MSF) and multi-effect distillation (MED) desalination plants operating along coastlines and on offshore platforms rely heavily on 1.75" titanium condenser tubes. In brine environments with chloride concentrations exceeding 50,000 ppm, titanium's passive layer remains fully intact, enabling plants to operate continuously for decades without condenser tube replacement — a critical operational advantage for water-scarce regions.
Modern naval frigates, destroyers, and submarines specify titanium tubing for main engine seawater cooling, auxiliary machinery cooling, and weapons system thermal management. The 1.75" OD titanium tube's combination of lightweight construction, zero galvanic corrosion risk, and magnetic neutrality (important for minesweepers and submarines) makes it irreplaceable in naval engineering specifications including MIL-T-81556 and NATO STANAG requirements.
Deepwater subsea production systems use titanium tubes within umbilical bundles for methanol injection, scale inhibitor dosing, and hydraulic control fluid conveyance. At water depths exceeding 3,000 meters, where ambient pressures surpass 300 bar and temperatures approach 4°C, the 1.75" titanium tube's resistance to hydrogen embrittlement and external seawater corrosion ensures the integrity of chemical injection systems critical to flow assurance.
LNG carrier vessels utilize seawater vaporizers where 1.75" titanium tubes transfer ambient seawater heat to cryogenic LNG, enabling regasification at sea. The tube must simultaneously resist seawater corrosion on its exterior and thermal cycling stresses induced by -162°C LNG on its interior — a dual-environment challenge that titanium handles with a performance profile no other metallic material can match at comparable weight.
As shallow-water reserves deplete, oil and gas operators are pushing into ultra-deepwater fields in the Gulf of Mexico, pre-salt Brazil, and West Africa. These environments demand materials that can withstand extreme pressure, low temperatures, and aggressive seawater chemistry — conditions where titanium tube performance is unrivaled and demand is accelerating.
Global offshore wind capacity is expected to reach 380 GW by 2032. Each offshore wind installation incorporates titanium tubing in cooling systems, hydraulic circuits, and structural components. This renewable energy transition is creating a sustained, multi-decade demand surge for marine-grade titanium tube products across European, American, and Asian markets.
IMO 2020 sulfur cap regulations and evolving MARPOL standards are pushing shipbuilders and operators toward materials that reduce maintenance chemical usage. Titanium's self-protecting surface eliminates the need for corrosion inhibitor dosing in cooling water circuits, directly supporting compliance with stricter marine pollution prevention requirements.
Marine operators are increasingly adopting total cost of ownership (TCO) frameworks rather than upfront capital cost comparisons. Under TCO analysis, titanium tubing consistently outperforms stainless steel and copper-nickel alternatives when factoring in 30-year maintenance costs, unplanned downtime losses, and end-of-life recyclability — shifting procurement decisions decisively toward titanium.
ASTM Grade 1 titanium offers the highest purity and ductility in the commercially pure (CP) titanium family. Its exceptional formability makes it ideal for complex tube bending operations required in shipboard heat exchanger installations and marine HVAC systems where tight bend radii are necessary.
Grade 2 is the most widely specified titanium grade in marine and offshore applications. Balancing excellent corrosion resistance with adequate mechanical strength, it covers the broadest range of seawater service conditions including condenser tubes, heat exchangers, and seawater piping in temperatures up to 260°C.
The addition of 0.12–0.25% palladium in Grade 7 dramatically improves resistance to crevice corrosion and reducing acid environments. This makes Grade 7 the preferred choice for seawater systems with restricted-flow zones, tube sheet crevices in heat exchangers, and offshore chemical processing where reducing conditions may be encountered.
Grade 9 (Ti-3Al-2.5V) delivers significantly higher strength than CP grades while retaining good corrosion resistance and weldability. In offshore structural tubing, hydraulic lines, and high-pressure marine systems, Grade 9 enables wall thickness reduction (and therefore weight savings) while meeting pressure rating requirements.
For marine applications involving elevated temperatures combined with reducing or mildly acidic conditions — such as offshore geothermal energy systems and high-temperature desalination processes — Grade 12 (Ti-0.3Mo-0.8Ni) provides enhanced corrosion resistance beyond standard CP grades.
Our manufacturing facility, spanning over 2,000 square meters, is strategically located in Suzhou, China, near Shanghai. Since its establishment in 2013, Rewell Titanium has quickly made a name for itself in the industry. This success is deeply rooted in the extensive experience and insightful leadership of our chairman, who has spent nearly 30 years in the non-ferrous metals sector.
With a keen understanding of market demands and an unwavering commitment to product quality, we continuously optimize our production processes and invest in state-of-the-art equipment to ensure every product meets industry-leading standards. In addition to offering standardized products, we provide customized solutions tailored to meet our clients' specific operational needs, even in the most challenging marine and offshore environments.
At Rewell Titanium, our core belief is: "Helping every customer achieve success." We firmly understand that our customers' success is the driving force behind our own growth. Therefore, we go beyond providing exceptional products by offering comprehensive technical support and after-sales service.
Our dedicated team works closely with clients to address challenges, optimize applications, and maximize performance in marine and offshore environments. Through collaboration and innovation, we take pride in witnessing our clients' growth and achievements. We believe that delivering superior products enhances our clients' competitiveness, and in turn, their success leads to further cooperation.
This mutually beneficial relationship forms the foundation of our business and is the reason why so many offshore operators, naval architects, and marine engineering contractors continue to choose Rewell Titanium as their preferred titanium tube supplier.
Rewell Titanium is ISO 9001:2015 certified, and every product batch is accompanied by inspection reports issued by certified testing agencies, ensuring the highest standards of quality and performance. Our rigorous quality control system covers every stage of production, from raw material procurement to final delivery, guaranteeing that our products consistently meet and exceed our clients' expectations.
For marine and offshore applications where material failure can result in catastrophic consequences, our multi-stage quality assurance process provides the documentation trail, traceability, and third-party verification that project engineers, classification societies, and end-user operators demand. Mill test reports (MTRs), chemical composition certifications, and mechanical property test results are provided as standard with every shipment.
Where success is within reach — partner with us for your next marine or offshore titanium tube project.
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