TA10 / Gr.12 Titanium-Molybdenum-Nickel Alloy Bars (Ti-0.3Mo-0.8Ni)
TA10 / ASTM Gr.12 — The Corrosion-Resistant Titanium Alloy
ASTM Grade 12 (Chinese designation TA10) is a near-alpha titanium alloy containing small additions of molybdenum (0.2–0.4%) and nickel (0.6–0.9%). This carefully balanced composition — Ti-0.3Mo-0.8Ni — delivers significantly improved corrosion resistance compared to commercially pure titanium, particularly in reducing acid environments and crevice corrosion scenarios.
Gr.12 occupies a unique position: it offers corrosion performance close to Grade 7 (Ti-0.2Pd) at a substantially lower cost, making it an economically attractive choice for large-scale industrial equipment.
Chemical Composition
| Element | Content (wt%) |
|---|---|
| Titanium (Ti) | Balance |
| Molybdenum (Mo) | 0.2 – 0.4 |
| Nickel (Ni) | 0.6 – 0.9 |
| Carbon (C) | ≤ 0.08 |
| Oxygen (O) | ≤ 0.25 |
| Nitrogen (N) | ≤ 0.03 |
| Hydrogen (H) | ≤ 0.015 |
| Iron (Fe) | ≤ 0.30 |
Mechanical Properties (Typical)
| Property | Value |
|---|---|
| Tensile Strength | ≥ 483 MPa (70 ksi) |
| Yield Strength (0.2%) | ≥ 345 MPa (50 ksi) |
| Elongation | ≥ 18% |
| Reduction of Area | ≥ 25% |
| Density | 4.51 g/cm³ |
| Melting Point | ~1668°C |
Available Specifications
| Parameter | Range |
|---|---|
| Diameter | Φ10 mm – Φ300 mm |
| Length | Up to 6000 mm or custom cut |
| Condition | Forged, hot-rolled, or annealed |
| Surface | Black (as-forged), turned/peeled, or ground/polished |
| Tolerances | Standard or precision (h7, h8, h9) |
Applicable Standards
- ASTM B348 — Titanium and Titanium Alloy Bars and Billets
- ASTM B381 — Titanium and Titanium Alloy Forgings
- GB/T 2965 — Titanium and Titanium Alloy Bars (Chinese National Standard)
- ASME SB-348 — Pressure vessel applications
Why Choose Gr.12 Over Other Grades?
Gr.12 vs. Grade 2 (CP Titanium)
Grade 2 is the most commonly used CP titanium — affordable and versatile. However, in hot brine, reducing acids (HCl, H₂SO₄), and crevice corrosion environments, Grade 2 can fail. Gr.12’s Mo and Ni additions provide a significant upgrade in these conditions while maintaining similar weldability and formability.
Gr.12 vs. Grade 7 (Ti-0.2Pd)
Grade 7 offers the best corrosion resistance among near-CP grades, but its palladium content makes it expensive. Gr.12 achieves comparable performance in many environments at 30–50% lower material cost, making it the preferred choice for cost-sensitive projects.
Gr.12 vs. Grade 5 (Ti-6Al-4V)
Grade 5 is the go-to high-strength alloy, but its corrosion resistance in reducing acids is not significantly better than CP grades. Gr.12 is the better choice when the primary requirement is corrosion resistance rather than mechanical strength.
Key Applications
Chemical Processing
- Heat exchangers handling hot HCl, H₂SO₄, and organic acids
- Reactor vessels and agitator shafts
- Piping systems in chlor-alkali plants
Oil & Gas
- Sour-service downhole components (NACE MR0175 compliant)
- Subsea valve stems and fasteners
- HP/HT well completion equipment
Marine & Desalination
- MSF and MED evaporator tubes
- Plate heat exchanger plates
- Seawater piping and fittings
Power Generation
- Condenser tubing in coastal power plants
- Flue gas desulfurization (FGD) equipment
- Nuclear waste processing components
Quality Assurance
Every TA10/Gr.12 bar we supply comes with:
- Mill Test Certificate (MTC) — Full chemical and mechanical test results per heat
- Ultrasonic Testing (UT) — Per ASTM B381 / EN 10228 for internal defect detection
- Dimensional Inspection Report — Diameter, length, straightness, and surface quality
- Traceability — Full heat-to-bar traceability from billet to finished product
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Quality Assurance
- ✓ ISO 9001:2015 Certified Production
- ✓ Material Test Certificate (MTC) with Every Order
- ✓ ASTM / ASME / AMS Standard Compliance
- ✓ Third-party Inspection Available
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