GR1 Titanium vs GR2: Which One Should You Buy?

GR2 is stronger. About 30 to 40 percent stronger in tensile strength.

A GR2 tube can handle higher pressure than the same size GR1 tube

A GR2 rod can support more weight before bending

For most chemical and marine applications, GR1 is already strong enough

A U-bend tube stretches on the outside of the bend. GR1 with 24% elongation can handle this stretch. GR2 with 20% elongation is at the limit. If the bend radius is tight, GR2 will crack.

Real example: A customer switched from GR1 to GR2 to save 5% on material cost. 12% of U-bend tubes cracked during bending. The scrap cost wiped out all savings.

GR2 is slightly cheaper. Typically 5 to 10% less than GR1.

GR1 requires purer raw material. The oxygen limit of 0.18% means higher grade sponge titanium. GR2 at 0.25% is easier and cheaper to produce.

But material cost is not the full picture. Consider fabrication cost.

GR2 is more common. GR1 is readily available but less stock.

If you need a non-standard size quickly, GR2 is easier to find. GR1 is often made to order for custom dimensions.

Buy GR1 when:

You are making U-bend tubes for heat exchangers

Your part requires deep drawing

You have tight radius bends (under 2.5x OD)

Formability is the priority

The part is thin wall (under 1mm)

You are bending welded tube with seam on neutral axis

You want maximum safety margin against cracking

Buy GR2 when:

Your application is straight pipe with no bends

You need higher strength for pressure or load

You are making simple rolled cylinders

Bends are large radius (over 3x OD)

Lower material cost is important

Forming is minimal or none

You are buying standard sizes from stock

Heat exchanger manufacturer: U-bend tubes in 19.05mm OD with 1.2mm wall. Bend radius 32mm (1.7x OD). Uses GR1. Tried GR2 once. 10% cracking rate. Switched back.

Marine piping fabricator: Straight pipe, no bends. Uses GR2. Lower cost, higher strength. No issues.

Chemical plant reactor liner: Deep drawn shape. GR1 only. GR2 would crack.

Desalination plant: Straight titanium tubes for evaporator. GR2 works fine. No forming required.

Medical device manufacturer: Small formed components. GR1 for formability. GR2 would require larger bend radii.

1. Is GR2 stronger than GR1?

Yes, GR2 is about 44 percent stronger. GR2 tensile strength is 345 MPa minimum. GR1 is 240 MPa minimum. For yield strength, GR2 is 275-450 MPa while GR1 is 170-310 MPa. If your application needs higher strength, choose GR2. If not, GR1 is strong enough for most chemical and marine applications.

2. Is GR1 easier to bend than GR2?

Yes, GR1 is significantly easier to bend. GR1 elongation is 24 percent minimum. GR2 is 20 percent minimum. That 4 percent difference means GR1 can bend to a tighter radius without cracking. For U-bend tubes and deep drawing, GR1 is the standard. GR2 is for straight pipe or very large radius bends only.

3. Which grade costs more, GR1 or GR2?

GR1 costs about 5 to 10 percent more per kilogram. The reason is purer raw material. GR1 requires oxygen below 0.18 percent. GR2 allows 0.25 percent. That small difference in raw material cost adds up. But if your parts crack using GR2, the scrap cost will far exceed any material savings.

4. Can I use GR2 for U-bend heat exchanger tubes?

Not recommended. GR2 has lower ductility. The outside of the U-bend stretches during forming. GR2 at 20 percent elongation is at the limit. Many fabricators see 5 to 15 percent crack rates when using GR2 for U-bends. GR1 with 24 percent elongation keeps crack rates under 2 percent.

5. Can I use GR1 for high pressure piping?

It depends on the pressure. GR1 yield strength is 170 MPa minimum. Calculate your hoop stress. If the calculated stress is below 170 MPa, GR1 works. If it is above, use GR2. For most moderate pressure applications under 10 MPa, GR1 is fine.

6. Which grade has better corrosion resistance?

They are identical. Both GR1 and GR2 are commercially pure titanium. The passive oxide film that provides corrosion resistance forms on both grades. Oxygen content does not affect corrosion. For seawater, chlorides, acetic acid, and dilute sulfuric acid, both perform the same.

7. What is the actual difference in oxygen content between GR1 and GR2?

GR1 allows 0.18 percent oxygen maximum. GR2 allows 0.25 percent maximum. That is a difference of 0.07 percent. A small number on paper, but it changes the material behavior significantly. Lower oxygen means lower strength and higher ductility. Higher oxygen means higher strength and lower ductility.

8. Can I weld GR1 to GR2?

Yes. Use ERTi-2 filler metal. That is the standard filler for both grades. Use pure argon shielding on both sides of the weld. Clean everything with acetone before welding. No post-weld heat treatment is required for either grade.

9. How do I choose between GR1 and GR2 for my project?

Ask two questions. First, does your part need tight radius bending or deep drawing? If yes, choose GR1. Second, does your part need higher strength for pressure or load? If yes and no tight bends, choose GR2. For straight pipe with no forming, GR2 is usually the better choice because it is stronger and cheaper.

10. Is GR1 worth the extra cost over GR2?

For formed parts, yes. The extra 5 to 10 percent material cost is small compared to the cost of scrapped parts. If GR2 cracks on 10 percent of your U-bends, that 10 percent scrap loss is much more than the 5 percent material savings. For straight pipe with no forming, GR2 is the better value.

11. Does GR2 work for deep drawing?

No. Deep drawing requires high ductility. GR2 at 20 percent elongation is not enough. The material will thin out and crack at the sidewall or base radius. GR1 at 24 percent elongation is the standard for deep drawing titanium. Use GR1 for any deep drawn part.