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| Nome da marca: | YUHONG |
| Número do modelo: | Tubo de titânio sem costura ASME SB338 Gr.2 |
| MOQ: | 500kg |
| Condições de pagamento: | L/C,T/T |
ASTM B338 / ASME SB338 Grade 2 R50400 Titanium Tube Ti 2 Seamless Heat Exchanger Tube
ASTM B338 Grade 2 Seamless Titanium Tube is the premier choice for heat transfer equipment handling seawater, brackish water, or aggressive chloride-laden chemicals. Its combination of reliable corrosion resistance, light weight, and seamless integrity makes it a long-term, low-maintenance solution for critical cooling and process applications.
Comparison: Titanium Gr.2 vs. Alternatives
Vs. Copper-Nickel (90/10 or 70/30): Ti Gr.2 offers far superior resistance to high-velocity seawater erosion and pitting. However, CuNi has better biofouling properties in stagnant water and is cheaper.
Vs. Stainless Steel (316L): In chlorides (seawater), 316L will eventually pit or suffer SCC. Titanium Gr.2 will not. Titanium is also immune to MIC (Microbiologically Influenced Corrosion).
Vs. Titanium Grade 1: Gr.1 is softer and more formable (used for tubing in Gulf of Mexico due to extreme formability needs), but Gr.2 is stronger, allowing higher pressure ratings.
Vs. Titanium Grade 5 (6Al-4V): Gr.5 is much stronger but harder to form and weld for tube applications. Gr.2 is preferred for corrosion resistance and fabricability.
ASME SB338 Grade 2 Seamless Titanium Tube Chemical Composition
| Element | Chemical Composition % | ||||||||
| Grade 1 | Grade 2 | Grade 3 | Grade 5 | Grade 7 | Grade 9 | Grade 11 | Grade 12 | Grade 23 | |
| Nitrogen, max | 0.03 | 0.03 | 0.05 | 0.05 | 0.03 | 0.03 | 0.03 | 0.03 | 0.03 |
| Carbon, max | 0.08 | 0.08 | 0.08 | 0.08 | 0.08 | 0.08 | 0.08 | 0.08 | 0.08 |
| Hydrogen, max | 0.015 | 0.015 | 0.015 | 0.015 | 0.015 | 0.015 | 0.015 | 0.015 | 0.0125 |
| Iron, max | 0.20 | 0.30 | 0.30 | 0.40 | 0.30 | 0.25 | 0.20 | 0.30 | 0.25 |
| Oxygen, max | 0.18 | 0.25 | 0.35 | 0.20 | 0.25 | 0.15 | 0.18 | 0.25 | 0.13 |
| Aluminum | … | … | … | 5.5-6.75 | … | 2.5-3.5 | … | … | 5.5-6.5 |
| Vanadium | … | … | … | 3.5-4.5 | … | 2.0-3.0 | … | … | 3.5-4.5 |
| Tin | … | … | … | … | … | … | … | … | … |
| Ruthenium | … | … | … | … | … | … | … | … | … |
| Palladium | … | … | … | … | 0.12-0.25 | … | 0.12-0.25 | … | … |
| Molybdenum | … | … | … | … | … | … | … | 0.2-0.4 | … |
| Chromium | … | … | … | … | … | … | … | … | … |
| Nickel | … | … | … | … | … | … | … | 0.6-0.9 | … |
| Niobium | … | … | … | … | … | … | … | … | … |
| Ziconium | … | … | … | … | … | … | … | … | … |
| Silicon | … | … | … | … | … | … | … | … | … |
| Residuals, max each | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 |
| Residuals, max total | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 |
| Titanium | balance | balance | balance | balance | balance | balance | balance | balance | balance |
Key Properties of ASME SB338 Grade 2 Seamless Titanium Tube
Corrosion Resistance: This is the primary reason to choose Gr.2. It is virtually immune to attack by seawater, chlorides, and brackish water up to elevated temperatures. It withstands pitting, crevice corrosion, and stress corrosion cracking (SCC) where stainless steels fail.
Strength: Moderate. It is stronger than pure copper and most copper-nickel alloys, but weaker than stainless steel (allowing for thinner walls in some applications).
Lightweight: Density is approximately 4.51 g/cm³, about 40% lighter than steel and 50% lighter than copper-nickel.
Biofouling Resistance: The oxide layer is toxic to marine organisms, preventing barnacles and mussels from attaching, which keeps heat transfer efficient.
ASME SB338 Grade 2 Seamless Titanium Tube Tensile Strength
| Grade | Tensile Strength, min | Yield Strength (0.2% Offset) | Elongation 2 in. or 50 mm | |||||
| min | max | |||||||
| Ksi | (Mpa) | Ksi | (Mpa) | Ksi | (Mpa) | gage length min % | ||
| Grade 1 | 35 | (240) | 25 | (170) | 45 | (310) | 24 | |
| Grade 2 | 50 | (345) | 40 | (275) | 65 | (450) | 20 | |
| Grade 3 | 65 | (450) | 55 | (380) | 80 | (550) | 18 | |
| Grade 5 | 130 | (895) | 120 | (828) | … | … | 10 | |
| Grade 7 | 50 | (345) | 40 | (275) | 65 | (450) | 20 | |
| Grade 9 | 90 | (620) | 70 | (483) | 45 | … | 15 | |
| Grade 11 | 35 | (240) | 25 | (170) | … | (310) | 24 | |
| Grade 12 | 70 | (483) | 50 | (345) | … | … | 18 | |
| Grade 23 | 120 | (828) | 110 | (759) | … | … | 10 | |
Application
Desalination Plants (Multi-Stage Flash Distillation): Used in brine heaters and heat rejection sections due to total resistance to hot saline brine.
Offshore Oil & Gas Platforms: Seawater cooling systems for compressors and process fluids.
Power Generation: Surface condensers in coastal power plants (nuclear, coal, gas) where seawater is the cooling medium.
Chemical Processing: Handling wet chlorine gas, chlorinated hydrocarbons, and organic acids.
Marine HVAC: Chilled water systems using seawater as a heat sink.
Aquaculture: Heat exchangers for fish farms where copper alloys would be toxic to the stock.
