Titanium Grade 2 Pipes

Titanium Grade 2 (UNS R50400) Seamless and Welded Pipe to ASTM B861 and B862

Dinesh Tube India supplies and exports titanium Grade 2 pipes from Mumbai for seawater, chlorine and chemical process piping in India and abroad. We supply seamless pipe to ASTM B861 / ASME SB861 and welded pipe to ASTM B862 / ASME SB862 in Grade 2 (UNS R50400, Werkstoff 3.7035), by NPS and schedule, with EN 10204 3.1 mill test certificates.

Grade 2 is commercially pure (CP) titanium, not an alloy. It is the most widely used titanium grade for piping: it resists seawater, wet chlorine and most oxidising and chloride media, forms and welds easily, and costs the least of the corrosion grades. Where hot brines or reducing acids are present, Grade 12 or Grade 7 pipe is the step up. For all grades, see our titanium pipes page.

Table of Contents

Specification & Sizes
Schedule & Weight Table
Seamless vs Welded
Grade 2 vs Grade 12 vs Grade 7
Chemical Composition
Mechanical Properties
Where Grade 2 Pipe Works Best
Grade 2 Piping Package
Applications
FAQs

Titanium Grade 2 seamless and welded pipes to ASTM B861 and B862

Titanium Grade 2 Pipe Schedule and Weight Table

NPS	OD (mm)	Sch 10S Wall (mm)	Sch 10S kg/m	Sch 40S Wall (mm)	Sch 40S kg/m	Sch 80S Wall (mm)	Sch 80S kg/m
1/2"	21.34	2.11	0.57	2.77	0.73	3.73	0.93
3/4"	26.67	2.11	0.73	2.87	0.97	3.91	1.26
1"	33.40	2.77	1.20	3.38	1.44	4.55	1.86
1½"	48.26	2.77	1.79	3.68	2.32	5.08	3.11
2"	60.33	2.77	2.26	3.91	3.13	5.54	4.30
3"	88.90	3.05	3.71	5.49	6.49	7.62	8.78
4"	114.30	3.05	4.81	6.02	9.24	8.56	12.83
6"	168.28	3.40	7.94	7.11	16.24	10.97	24.45
8"	219.08	3.76	11.47	8.18	24.45	12.70	37.14
10"	273.05	4.19	15.96	9.27	34.65	12.70	46.85
12"	323.85	4.57	20.68	9.53	42.45	12.70	55.99

Weight (kg/m) = (OD − wall) × wall × 0.01417, using titanium Grade 2 density 4.51 g/cm³. Wall thicknesses per ASME B36.19. Sch 5S thin-wall pipe is also available, mainly welded.

Seamless vs Welded Grade 2 Pipe

Point	Seamless (B861)	Welded (B862)
How it is made	Extruded or pierced hollow, then drawn	Formed from Grade 2 strip or plate, welded and annealed
Typical sizes	Small and medium NPS, heavier walls	Medium and large NPS, thin walls (Sch 5S, 10S)
Typical use	Higher-pressure and small-bore lines	Seawater intake, cooling water, brine and process lines
Cost and lead time	Higher	Lower, especially in larger sizes

Titanium pipe is welded by GTAW (TIG) or plasma arc, never by the ERW process used for carbon steel. For welded pipe, ask for the weld to be tested to ASTM B862 (and radiographed if your code requires it).

Grade 2 vs Grade 12 vs Grade 7 Pipe

Point	Grade 2 (CP)	Grade 12 (Ti-0.3Mo-0.8Ni)	Grade 7 (Ti-0.15Pd)
Min. tensile / yield	345 / 275 MPa	483 / 345 MPa	345 / 275 MPa
Seawater, wet chlorine, oxidising media	Excellent	Excellent	Excellent
Crevice corrosion in hot brines	Fair	Excellent	Excellent
Dilute reducing acids (HCl, H₂SO₄)	Poor to fair	Good	Best
Availability	Widest; most sizes	Good	Mostly made to order
Relative cost	Lowest	Moderate	Highest

Grade 2 is the right choice for most seawater and chlorine service. Step up to Grade 12 when crevices at flanges or deposits see hot brine (roughly above 70–80 °C), and to Grade 7 when the line carries dilute reducing acid.

Titanium Grade 2 Pipe Chemical Composition (%)

Element	Grade 2
Iron (Fe), max	0.30
Oxygen (O), max	0.25
Carbon (C), max	0.08
Nitrogen (N), max	0.03
Hydrogen (H), max	0.015
Residuals, each / total, max	0.1 / 0.4
Titanium (Ti)	Balance

Titanium Grade 2 Pipe Mechanical Properties (Minimum)

Tensile Strength	Yield Strength (0.2%)	Elongation	Density
345 MPa (50 ksi)	275 MPa (40 ksi)	20%	4.51 g/cm³ (0.163 lb/in³)

Check the current editions (ASTM B861-24, B862-23) and the mill certificate for governing values.

Where Grade 2 Pipe Works Best

Seawater: Grade 2 is practically immune to seawater corrosion, pitting and erosion at normal velocities, which is why it is used for intake, cooling-water and desalination piping.
Wet chlorine and oxidising media: it resists wet chlorine, chlorine dioxide, hypochlorite and nitric acid, so it is common in chlor-alkali and bleach plants.
Easy fabrication: Grade 2 bends, flares and welds more easily than the stronger grades.
Limits: not for dry chlorine gas, hydrofluoric acid or fluorides, or reducing acids (use Grade 7); hot-brine crevices are better served by Grade 12.

Grade 2 Piping Package

We can supply matching Grade 2 fittings, flanges, tubes and plate for the same line:

Grade 2 Fittings

WPT2 elbows, tees, reducers, caps and stub ends to ASTM B363.

Grade 2 Flanges

F-2 weld neck, slip-on, blind and lap-joint flanges to ASTM B381.

Grade 2 Tubes

B338 Grade 2 heat-exchanger and condenser tubes, sized by OD.

Need Grade 2 titanium pipe? Send the NPS, schedule, seamless or welded, length and quantity to kamlesh@dineshtube-india.com or call +91 83559 10913. You can also send an enquiry.

Welding and Fabrication

Welding: GTAW with full argon shielding, trailing shields and internal purge, using ERTi-2 filler. A silver or light straw weld colour is acceptable; blue or grey means contamination.
Iron contamination: keep titanium pipe away from carbon-steel fabrication and use clean tools.
Testing: each pipe is tested to ASTM B861 or B862, including hydrostatic or non-destructive electric testing, with PMI on request.

Titanium Grade 2 Pipe Applications

Seawater intake, cooling-water and firewater lines
Desalination plants (MSF and RO)
Chlor-alkali, chlorine and bleach plants
Power-plant condenser and cooling systems
Chemical process and pulp & paper bleaching
Offshore seawater and ballast piping

Seawater, chlorine and chemical uses of titanium Grade 2 pipes

Titanium Grade 2 Pipes: FAQs

Which standard covers titanium Grade 2 pipe?

Seamless titanium Grade 2 pipe is made to ASTM B861 (ASME SB861) and welded pipe to ASTM B862 (ASME SB862). Both cover Grade 2 (UNS R50400) with minimum tensile 345 MPa and yield 275 MPa.

Is titanium Grade 2 an alloy?

No. Grade 2 is commercially pure (CP) titanium with small controlled amounts of oxygen and iron. Alloy grades include Grade 5 (Ti-6Al-4V) and Grade 12 (Ti-0.3Mo-0.8Ni).

What is the difference between ASTM B861 and B862?

ASTM B861 covers seamless titanium pipe and ASTM B862 covers welded titanium pipe. Welded pipe is usually lower cost in larger sizes and thin walls; seamless is used for smaller sizes and higher-pressure lines.

What sizes and schedules are available in Grade 2 pipe?

Grade 2 pipe is supplied by NPS and schedule, about ½" to 12" NPS in Sch 5S, 10S, 40S and 80S, with welded pipe up to 24" NPS to order. Wall thicknesses follow ASME B36.19.

When should I use Grade 12 or Grade 7 pipe instead of Grade 2?

Grade 2 suits seawater, wet chlorine and most chloride service. Use Grade 12 where hot brine can attack crevices at flanges and deposits, and Grade 7 where dilute reducing acids such as hydrochloric or sulphuric acid are present.

How much does titanium Grade 2 pipe weigh?

Weight in kg/m = (OD − wall) × wall × 0.01417, with OD and wall in mm. For example, 2" Sch 40S (60.33 × 3.91 mm) weighs about 3.13 kg/m.

What is the price of titanium Grade 2 pipe?

The price depends on NPS, schedule, seamless or welded, length, quantity and certification. Send your requirement to kamlesh@dineshtube-india.com or call +91 83559 10913 for a current quote.

Export Destinations for Titanium Grade 2 Pipes

We supply titanium Grade 2 pipes across India, including desalination, power, chlor-alkali and chemical projects in Gujarat, Maharashtra, Tamil Nadu and Andhra Pradesh, and export to the Middle East (UAE, Saudi Arabia, Qatar, Oman, Kuwait, Bahrain), Asia (Japan, South Korea, Singapore, Malaysia, Vietnam, Bangladesh), Africa (Egypt, South Africa) and Europe on request.