Titanium Grade 7 Pipe | ASTM B861 / B862 Supplier India

Titanium Grade 7 (Ti-0.15Pd, UNS R52400) Seamless and Welded Pipe to ASTM B861 and B862

Dinesh Tube India supplies and exports titanium Grade 7 pipes from Mumbai for acid, chlor-alkali 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 7 (UNS R52400, Werkstoff 3.7235), by NPS and schedule, with EN 10204 3.1 mill test certificates.

Grade 7 is commercially pure titanium with 0.12–0.25% palladium. It has the same strength as Grade 2, but the palladium keeps titanium passive in dilute reducing acids such as hydrochloric and sulphuric acid, and in the most severe hot-chloride crevices. It is the most corrosion-resistant of the common titanium grades, and also the most expensive. For all grades, see our titanium pipes page.

Table of Contents

Specification & Sizes
Schedule & Weight Table
Seamless vs Welded
Grade 7 vs Grade 12 vs Grade 16
Chemical Composition
Mechanical Properties
Why Grade 7 in Reducing Acids
Grade 7 Piping Package
Applications
FAQs

Titanium Grade 7 seamless and welded pipes to ASTM B861 and B862

Titanium Grade 7 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

Weight (kg/m) = (OD − wall) × wall × 0.01417, using titanium density 4.51 g/cm³. Wall thicknesses per ASME B36.19.

Seamless vs Welded Grade 7 Pipe

Point	Seamless (B861)	Welded (B862)
How it is made	Extruded or pierced hollow, then drawn	Formed from Grade 7 plate or strip, welded and annealed
Typical sizes	Small and medium NPS	Medium and large NPS, thin walls
Typical use	Higher-pressure and small-bore lines	Brine, seawater and process lines
Cost and lead time	Higher; Grade 7 is mostly made to order	Lower, especially in larger sizes

Grade 7 vs Grade 2 vs Grade 12 vs Grade 16 Pipe

Point	Grade 2	Grade 12	Grade 16 (Ti-0.05Pd)	Grade 7 (Ti-0.15Pd)
Min. tensile / yield	345 / 275 MPa	483 / 345 MPa	345 / 275 MPa	345 / 275 MPa
Dilute reducing acids (HCl, H₂SO₄)	Poor to fair	Good	Very good	Best
Crevice corrosion in hot brines	Fair	Excellent	Excellent	Excellent
Palladium	None	None	0.04–0.08%	0.12–0.25%
Relative cost	Lowest	Moderate	High	Highest

If the main problem is hot-brine crevice corrosion rather than acid, Grade 12 is usually enough and costs less. Grade 16 has about a third of the palladium of Grade 7 and is sometimes accepted as a lower-cost alternative; check your specification first.

Titanium Grade 7 Pipe Chemical Composition (%)

Element	Grade 7
Palladium (Pd)	0.12–0.25
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
Titanium (Ti)	Balance

Titanium Grade 7 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.

Why Grade 7 Pipe in Reducing Acids?

Stable passive film: palladium keeps titanium's protective oxide stable in dilute hydrochloric and sulphuric acid, where Grade 2 corrodes.
Crevice resistance: Grade 7 resists crevice attack at flanges, gaskets and deposits in hot chloride brines to higher temperatures than Grade 2.
Same fabrication as Grade 2: it forms and welds like CP titanium, with the same design strength.
Limits: not suitable for hydrofluoric acid, fluorides or dry chlorine gas, and not intended for hot concentrated HCl or H₂SO₄, where zirconium or tantalum may be needed.

Grade 7 Piping Package

In acid service, every wetted part of the line should be Grade 7, so that fittings and flange faces do not become the weak points. We can supply the complete package:

Grade 7 Fittings

WPT7 elbows, tees, reducers, caps and stub ends to ASTM B363.

Grade 7 Flanges

F-7 weld neck, slip-on, blind and lap-joint flanges to ASTM B381.

Grade 7 Plate

B265 Grade 7 plate for vessel shells, linings and tubesheets.

Need Grade 7 titanium pipe? Send the NPS, schedule, seamless or welded, length, quantity and process media 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 matching ERTi-7 filler so the weld keeps its acid resistance. 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.
Lead time: Grade 7 pipe is mostly made to order; plan for longer delivery than Grade 2.

Titanium Grade 7 Pipe Applications

Dilute hydrochloric and sulphuric acid process lines
Chlor-alkali and chlorine dioxide plants
Hydrometallurgy leaching and autoclave piping
Hot brine and high-chloride process piping
PTA, acetic acid and fine-chemical plants

Acid, chlor-alkali and chemical uses of titanium Grade 7 pipes

Titanium Grade 7 Pipes: FAQs

Which standards cover titanium Grade 7 pipe?

Seamless Grade 7 pipe is made to ASTM B861 (ASME SB861) and welded Grade 7 pipe to ASTM B862 (ASME SB862). Both cover pipe sized by NPS and schedule.

What is titanium Grade 7?

Titanium Grade 7 (UNS R52400, Werkstoff 3.7235) is commercially pure titanium with 0.12–0.25% palladium. It has the same strength as Grade 2 but much better resistance to dilute reducing acids and crevice corrosion.

Is Grade 7 titanium pipe resistant to hydrochloric acid?

Grade 7 resists dilute hydrochloric acid far better than Grade 2, especially at moderate temperatures. It is not intended for hot, concentrated HCl, where zirconium or tantalum may be required.

Should I use Grade 7 or Grade 12 pipe?

Use Grade 7 where reducing acids are present or crevice conditions are most severe. Grade 12 is stronger and lower cost and is usually enough for hot brines and desalination service.

What is titanium Grade 16?

Grade 16 (Ti-0.05Pd, UNS R52402) contains about a third of the palladium of Grade 7. It gives similar corrosion resistance in many services at lower cost, but check that your specification allows it.

What is the price of titanium Grade 7 pipe?

Grade 7 costs more than Grade 2 and Grade 12 because of its palladium content, and is mostly made to order. The price depends on NPS, schedule, seamless or welded, length and quantity. Send your requirement to kamlesh@dineshtube-india.com or call +91 83559 10913 for a current quote.

Which certificates come with Grade 7 pipes?

Every supply comes with an EN 10204 3.1 mill test certificate showing heat number, chemical analysis and mechanical properties to ASTM B861 or B862. EN 10204 3.2 certificates and third-party inspection can be arranged on request.

Export Destinations for Titanium Grade 7 Pipes

We supply titanium Grade 7 pipes across India, including chemical, chlor-alkali and hydrometallurgy 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.

Titanium Grade 7 Pipes