Grade 12 Titanium Alloy | Ti-0.3Mo-0.8Ni | UNS R53400 | ASTM B265 / B348 Supplier
Supplied by Huaxiao-Alloy – Your Trusted Global Alloy Partner
1. Grade 12 Titanium Alloy (Ti-0.3Mo-0.8Ni) Overview
Grade 12 Titanium Alloy, chemically designated as Ti-0.3Mo-0.8Ni, is a commercially pure–based titanium alloy strengthened with molybdenum (Mo) and nickel (Ni) to deliver significantly enhanced corrosion resistance and higher mechanical strength compared with standard CP titanium grades.
Grade 12 is widely recognized as one of the most practical and cost-effective corrosion-resistant structural titanium alloys, offering an excellent balance of:
Corrosion resistance (especially in reducing and chloride environments)
Moderate strength higher than CP titanium
Excellent weldability
Good formability for pressure equipment and piping systems
Because of this balance, Grade 12 is extensively used in chemical processing, offshore engineering, heat exchangers, pressure vessels, and marine structures, where both mechanical reliability and corrosion resistance are critical.
As a trusted Grade 12 titanium alloy supplier, Huaxiao-Alloy supplies UNS R53400 Ti-0.3Mo-0.8Ni in full product forms, strictly manufactured in accordance with ASTM, ASME, AMS, ISO, EN, and DIN standards, with complete documentation and global delivery capability.
2. Equivalent Standards & Designations
Grade 12 titanium alloy is internationally standardized and widely specified in corrosion-resistant equipment projects.
| Standard System | Designation |
|---|---|
| ASTM | Grade 12 (Ti-0.3Mo-0.8Ni) |
| UNS | R53400 |
| ASME | SB-265 / SB-348 |
| AMS | AMS 4914 (plates & sheets) |
| ISO | ISO 5832 (industrial reference) |
| DIN / EN | 3.7105 (industry equivalent) |
| JIS | Titanium Alloy Class 12 |
| GB (China) | TA10 |
➡️ These equivalents ensure seamless specification in international EPC, chemical, and offshore projects.
3. Chemical Composition of Grade 12 Titanium Alloy
Grade 12 is alloyed with small but effective additions of molybdenum and nickel, significantly improving corrosion performance and strength.
| Element | Content (%) |
|---|---|
| Titanium (Ti) | Balance |
| Molybdenum (Mo) | 0.20 – 0.40 |
| Nickel (Ni) | 0.60 – 0.90 |
| Iron (Fe) | ≤ 0.30 |
| Oxygen (O) | ≤ 0.25 |
| Carbon (C) | ≤ 0.08 |
| Nitrogen (N) | ≤ 0.03 |
| Hydrogen (H) | ≤ 0.015 |
Composition Insight
Molybdenum enhances resistance to reducing acids and crevice corrosion
Nickel improves corrosion resistance and weld stability
Balanced alloying avoids excessive cost while improving performance
4. Mechanical Properties of Ti-0.3Mo-0.8Ni (Grade 12)
4.1 Mechanical Properties at Room Temperature (Annealed)
| Property | Typical Value |
|---|---|
| Tensile Strength | ≥ 483 MPa |
| Yield Strength (0.2%) | ≥ 345 MPa |
| Elongation | ≥ 18% |
| Hardness | ~ 200 HB |
| Density | 4.51 g/cm³ |
| Elastic Modulus | ~105 GPa |
4.2 Mechanical Characteristics
Strength significantly higher than Grade 1–3
Comparable to Grade 9 in some forms
Excellent toughness and fatigue resistance
Suitable for load-bearing corrosion-resistant structures
5. Key Features & Advantages of Grade 12 Titanium Alloy
5.1 Excellent Corrosion Resistance in Aggressive Media
Grade 12 demonstrates outstanding resistance to:
Reducing acids (sulfuric acid environments)
Chloride-containing solutions
Seawater and marine atmospheres
Crevice and pitting corrosion
➡️ Often selected as a lower-cost alternative to palladium-alloyed titanium in many chemical services.
5.2 Higher Strength Than CP Titanium
Stronger than Grades 1–4
Allows thinner wall designs
Improves pressure rating of equipment
Reduces total system weight
5.3 Excellent Weldability
Very stable welding behavior
Weld zones retain corrosion resistance
No complex post-weld heat treatment required
Ideal for large welded pressure equipment
5.4 Good Formability & Fabrication Performance
Better formability than Grade 5
Suitable for rolling, bending, and forming
Lower springback than high-strength alloys
6. Available Product Forms from Huaxiao-Alloy
Huaxiao-Alloy supplies Grade 12 Ti-0.3Mo-0.8Ni in a full range of mill and fabricated products.
6.1 Titanium Sheets & Plates
Standard: ASTM B265 / ASME SB-265
Thickness: 0.5 mm – 60 mm
Surface: Pickled, annealed
6.2 Titanium Pipes & Tubes
Standard: ASTM B861 / B338
Seamless & welded
OD: 6 mm – 219 mm
Widely used for heat exchangers and piping
6.3 Titanium Bars & Rods
Standard: ASTM B348
Round, square, flat
Hot-rolled or forged
6.4 Titanium Forgings & Custom Fabrication
Tube sheets
Flanges
Pressure vessel components
OEM machining according to drawings
7. Typical Applications of Grade 12 Titanium Alloy
7.1 Chemical Processing Industry
Heat exchangers
Reactors
Pressure vessels
Acid handling systems
7.2 Oil, Gas & Offshore Engineering
Seawater piping systems
Offshore structural components
Corrosion-resistant fasteners
7.3 Power Generation & Desalination
Condenser tubing
Brine heaters
Evaporators
7.4 Marine Engineering
Seawater cooling systems
Marine piping
Structural components exposed to saltwater
7.5 Pulp & Paper Industry
Bleaching equipment
Chloride-rich process systems
8. Corrosion Resistance Performance (Detailed)
8.1 Comparison with Other Titanium Grades
| Environment | Grade 2 | Grade 9 | Grade 12 | Grade 7 |
|---|---|---|---|---|
| Seawater | Excellent | Excellent | Excellent | Excellent |
| Reducing Acids | Poor–Moderate | Moderate | Good–Excellent | Excellent |
| Crevice Corrosion | Moderate | Good | Very Good | Excellent |
| Cost | Low | Medium | Medium | High |
9. Fabrication, Machining & Welding Guide
9.1 Forming
Good cold and hot formability
Suitable for pressure vessel heads
Moderate springback
9.2 Machining
Easier to machine than Grade 5
Low cutting speed required
Sharp tools and coolant recommended
9.3 Welding
TIG, MIG, plasma welding recommended
Full inert gas shielding required
Weld corrosion resistance remains excellent
10. Heat Resistance & Thermal Properties
Continuous service temperature: ~300–350°C
Good thermal stability
Low thermal expansion
Not designed for very high-temperature structural use
11. Comparison: Grade 9 vs Grade 11 vs Grade 12
| Property | Grade 9 | Grade 11 | Grade 12 |
|---|---|---|---|
| Strength | Medium-High | Low | Medium |
| Corrosion Resistance | Excellent | Excellent | Very Good–Excellent |
| Reducing Acid Resistance | Moderate | Excellent | Very Good |
| Weldability | Excellent | Excellent | Excellent |
| Cost | Medium | Medium-High | Medium |
12. Quality Assurance & Certifications
All Grade 12 titanium supplied by Huaxiao-Alloy includes:
EN 10204 3.1 / 3.2 Mill Test Certificate
Full chemical & mechanical testing
Ultrasonic & eddy current inspection
PMI testing on request
ISO 9001 quality management
Full heat number traceability
13. Why Choose Huaxiao-Alloy as Your Grade 12 Titanium Supplier?
✅ Strong expertise in corrosion-resistant titanium alloys
✅ Long-term supply for chemical & offshore projects
✅ Full product range & custom fabrication
✅ Competitive pricing
✅ Fast global delivery
✅ Professional export & certification support
It offers an excellent balance of corrosion resistance, strength, and cost.
In many environments, yes—especially where palladium is not strictly required.
Yes, it is widely used for welded pressure equipment.
Yes, weldability is excellent with proper shielding.
Yes, full fabrication and machining services are available.
TItanium Products
If you found this article good, feel free to share it on your other social media platforms.
