Titanium Forging Supplier for Marine, Offshore, and Chemical Applications

August 11, 2026


Titanium — specifically commercially pure (CP) grades and Ti-6Al-4V is the material of choice for marine seawater systems, offshore FPSO desalination, chemical processing in oxidising acid environments, and hydrogen electrolyser components. Indian forging manufacturers with titanium forging capability, controlled-atmosphere heating (preventing alpha case), and NABL testing to SB-381 specifications are positioned to supply the global titanium industrial forging market beyond the aerospace sector.

GradeUNSTensile StrengthKey AdvantageApplication
CP Grade 1R50250240 MPa minMaximum corrosion resistance, maximum ductilitySWRO desalination, electrolyser, food
CP Grade 2R50400345 MPa minBest balance corrosion/strengthMarine heat exchangers, tubesheet, piping
CP Grade 4R50700552 MPa minHighest strength CP gradeMarine structural, pump shafts
Ti-6Al-4V Grade 5R56400895 MPa min (STA)Highest strength titanium alloyOffshore structural, subsea, deep sea
Ti-6Al-4V ELI Grade 23R56401Like Grade 5, lower O₂+FeFracture toughness + corrosionMedical, cryogenic, deep sea pressure

Commercially pure (CP) titanium’s corrosion resistance mechanism differs fundamentally from stainless steel and nickel alloys: titanium forms an extremely stable TiO₂ (titanium dioxide) passive film that self-heals immediately in the presence of even trace moisture or oxygen. This passive film is stable across a pH range of 0–14 and at temperatures up to approximately 315°C — far exceeding the stable passive film range of any stainless steel. As a result, CP titanium resists corrosion in nitric acid of all concentrations, chromic acid, hypochlorites, wet chlorine, seawater, and most organic acid environments.

Seawater heat exchangers — particularly in FPSO desalination systems, offshore platform cooling systems, and naval vessel cooling are the largest single application of industrial titanium forgings. The titanium tubesheet forging (typically Grade 2, CP titanium) allows seawater to contact titanium directly without corrosion stainless steel tubesheets would experience biofouling-enhanced pitting corrosion within 2–5 years in warm seawater, while titanium tubesheets remain uncorroded for 25+ years of continuous seawater service.

The offshore subsea environment is driving increasing use of Ti-6Al-4V Grade 5 (STA condition) for structural applications. At 895 MPa minimum tensile strength, Ti-6Al-4V provides strength-to-weight ratio 6× better than structural steel, complete seawater corrosion immunity, and no hydrogen embrittlement susceptibility. Subsea titanium pressure housings, structural connectors, and ROV structural frames use Ti-6Al-4V forgings.

Alpha case prevention the critical quality issue in titanium forging heating applies equally to industrial and aerospace titanium applications: controlled-atmosphere heating (inert gas purge or nitrogen blanket) and post-machining etch inspection. Industrial titanium forgings may not require AMS 2154 Class AA immersion UT ASME SB-381 requires conventional contact UT per ASTM B600, making the cost more competitive for marine and chemical process applications.

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Vinir Engineering — Capability for this Market

  1. AS9100D.
  2. CP titanium Grade 1, 2, and 4 forgings per ASTM B381 / ASME SB-381.
  3. Ti-6Al-4V Grade 5 forgings per ASTM B381 for subsea and offshore structural applications.
  4. Alpha case control: nitrogen gas purge during heating, electrolytic etch and visual inspection at 10× magnification of finished surfaces.
  5. NABL OES chemistry including oxygen, nitrogen, hydrogen verification.
  6. NABL tensile and Charpy testing.
  7. Contact UT per ASTM B600 / ASME SB-381.
  8. FPI per ASTM E165. PMI on 100% of titanium deliveries.
  9.  Passivation per ASTM A380 / A967.

Frequently Asked Questions

1.Why does titanium resist seawater corrosion so effectively compared to stainless steel?+–
Both titanium and stainless steel form passive oxide films but the films differ fundamentally in stability. Stainless steel’s chromium oxide passive film is disrupted by chloride ions at concentrations above a threshold that depends on temperature, pH, and dissolved oxygen in warm seawater (above 20°C), stainless steels below approximately 6% molybdenum are susceptible to pitting corrosion. Titanium’s TiO₂ passive film is not susceptible to chloride breakdown chloride ions are chemically unable to breach the TiO₂ film because TiO₂ is thermodynamically stable in the presence of chlorides. Additionally, titanium’s film self-heals instantly when scratched in seawater stainless steel’s film requires dissolved oxygen for repassivation, which may not be available in crevices and under biofouling deposits.
2.What is Ti-6Al-4V ELI (Grade 23) and when is it preferred over standard Grade 5?+–
Ti-6Al-4V ELI (Extra Low Interstitials, Grade 23, UNS R56401) has maximum oxygen content of 0.13% versus 0.20% in standard Grade 5, and maximum iron of 0.25% versus 0.30%. These tighter interstitial limits give Grade 23 better fracture toughness, fatigue crack growth resistance, and ductility at cryogenic temperatures. Grade 23 is specified for cryogenic applications (liquid hydrogen environments), deep sea applications where fracture toughness under hydrostatic pressure is critical, and medical implants where maximum ductility is required. Standard Grade 5 is adequate for most aerospace and offshore structural applications.
3.What is the ASTM B381 specification for titanium forgings and how does it differ from AMS 4928?+–
ASTM B381 (Specification for Titanium and Titanium Alloy Forgings) is the industrial standard covering commercially pure titanium grades (Grade 1–4) and Ti-6Al-4V (Grade 5) forgings for non-aerospace applications. ASME SB-381 adopts ASTM B381 for ASME pressure vessel code applications. AMS 4928 is the aerospace specification it adds more stringent chemistry controls, requires billet from aerospace-approved mills, and mandates AMS 2154 immersion UT rather than the contact UT per ASTM B600 referenced in B381. For marine, offshore, and chemical process titanium forgings, ASTM B381 / ASME SB-381 is the correct specification less demanding and less costly than AMS 4928.
4.What are the logistics and lead time considerations for industrial titanium forging supply from India?+–
Commercially pure titanium billet (Grade 1 and 2) is available from TIMET (USA), ATI (USA), and increasingly from Indian producers (TATA Advanced Materials, MIDHANI). Lead time for CP titanium billet from Indian mills is 4–8 weeks; from US mills is 8–12 weeks. Total lead time for a CP titanium industrial tubesheet forging from India (billet through forging, annealing, UT, FPI, passivation, and shipping) is typically 14–20 weeks comparable to European specialty forge shops and significantly shorter than US domestic titanium forging supply.
5.What chemical cleaning and passivation is required for titanium forgings before delivery?+–
Titanium forgings for industrial service require chemical cleaning to remove iron contamination from steel tooling contact (iron deposits cause galvanic corrosion in service), oxide scale from annealing, and lubricant residues. The standard cleaning process: (1) alkaline cleaning to remove organic lubricants; (2) acid pickling in HF-HNO₃ mixture to remove scale and iron contamination; (3) final rinse and passivation in 20–40% HNO₃ solution to restore the TiO₂ passive film. ASTM A380 covers cleaning procedures; ASTM A967 covers passivation testing. Passivation effectiveness is verified by the water break test or by the copper sulphate test (free iron causes copper deposition).