Grade 12 titanium is Ti-0.3Mo-0.8Ni, UNS R53400, Werkstoff 3.7105. ASTM B265 specifies 0.2 to 0.4 wt% molybdenum with 0.6 to 0.9 wt% nickel, giving about 483 MPa minimum tensile strength and a higher crevice corrosion threshold than Grade 2 in hot brine, at lower cost than the palladium grades.
Grade 12 titanium is the corrosion-upgrade grade. It is commercially pure titanium with small molybdenum and nickel additions that improve crevice corrosion resistance in hot chlorides and brines, at a lower cost than the palladium grades. This page covers what Grade 12 is, how it performs, how it compares to Grade 2 and Grade 7, and when to specify it.
European designation: In the EN and DIN system this is Werkstoff 3.7105 (Ti-0.3Mo-0.8Ni); in ASTM it is UNS R53400 (Grade 12).
What Grade 12 titanium is
Grade 12 is the Ti-0.3Mo-0.8Ni alloy, UNS R53400: titanium with about 0.3 percent molybdenum and 0.8 percent nickel. Those additions raise resistance to crevice and higher-temperature corrosion over CP titanium while keeping the metal weldable and formable. Beiyu Titanium supplies Grade 12 in sheet, plate, tube and bar to ASTM standards, with a mill test certificate to EN 10204 3.1 and heat-number traceability on the order.
| Field | Value the guide states |
|---|---|
| Alloy | Ti-0.3Mo-0.8Ni |
| UNS | R53400 |
| Molybdenum | 0.2 to 0.4 percent, per ASTM B265 Table 1 |
| Nickel | 0.6 to 0.9 percent, per ASTM B265 Table 1 |
| Minimum tensile, annealed | 483 MPa (70 ksi), per ASTM B265 Table 2 |
| Minimum yield, annealed | 345 MPa, per ASTM B265 Table 2 |
Mechanical properties
In the annealed condition Grade 12 has an ASTM minimum tensile strength near 483 MPa (70 ksi) and a yield near 345 MPa (50 ksi), with elongation around 18 percent. It is stronger than Grade 2 while keeping similar forming behaviour. Actual numbers are confirmed per heat on the EN 10204 3.1 certificate.
| Property | Grade 12 (Ti-0.3Mo-0.8Ni, R53400) |
|---|---|
| Tensile strength (min, annealed) | 483 MPa / 70 ksi |
| Yield strength (min, annealed) | 345 MPa / 50 ksi |
| Elongation (min) | 18 percent |
| Key trait | crevice corrosion resistance in hot chlorides and brines |
Corrosion resistance
Crevice corrosion is what Grade 12 is bought for. CP Grade 2 can suffer crevice attack in hot, concentrated chloride solutions; the molybdenum and nickel in Grade 12 push that limit higher, so it holds up in hotter brines and process streams. It keeps the general corrosion resistance of titanium in oxidising and neutral media. For strong reducing acids, the palladium of Grade 7 is still the better answer.
Grade 12 vs Grade 2
Grade 2 is the corrosion workhorse for ambient and moderately warm service, and it is cheaper. Grade 12 is the upgrade when the same chloride or brine runs hot enough to risk crevice attack on Grade 2. Specify Grade 12 over Grade 2 when temperature and chloride concentration climb; keep Grade 2 when the service is within its limits.
| Compared with | What the guide states |
|---|---|
| Grade 2 | Grade 2 is the corrosion workhorse for ambient and moderately warm service, and it is cheaper. Grade 12 is the upgrade when the same chloride or brine runs hot enough to risk crevice attack on Grade 2 |
| Grade 7 | Grade 7 adds 0.15 percent palladium for the best resistance to reducing acids and crevice corrosion, and it costs more because of the palladium. Grade 12 reaches part of that crevice resistance through molybdenum and nickel at lower cost |
Grade 12 vs Grade 7
Grade 7 adds 0.15 percent palladium for the best resistance to reducing acids and crevice corrosion, and it costs more because of the palladium. Grade 12 reaches part of that crevice resistance through molybdenum and nickel at lower cost. For hot brine and chloride duty on a budget, Grade 12 is the practical choice; for aggressive reducing acids, Grade 7 is worth the higher cost.
Typical applications
Grade 12 is specified for heat exchangers, condensers and process equipment in hot chloride or brine service: chemical processing, geothermal plant, hydrometallurgy autoclaves and seawater systems where Grade 2 would risk crevice corrosion. It is chosen for corrosion performance at temperature, not for strength.
| Where the guide says it is specified | Detail |
|---|---|
| Heat exchangers, condensers and process equipment | In hot chloride or brine service |
| Chemical processing, geothermal plant, hydrometallurgy autoclaves and seawater systems | Where Grade 2 would risk crevice corrosion |
Forms and standards
Beiyu supplies Grade 12 as sheet and plate to ASTM B265, tube to ASTM B338, and bar to ASTM B348. Pair the grade with the form on the request: thickness or outside diameter and wall, width or length, surface condition, and the certificate scope. For tube used in heat exchangers, see the titanium tube and pipe range.
| Form | Standard the guide names |
|---|---|
| Sheet and plate | ASTM B265 |
| Tube | ASTM B338 |
| Bar | ASTM B348 |
Cost and how to specify it
Grade 12 costs a little more than Grade 2 because of the alloy additions, and less than the palladium-bearing Grade 7. To get an accurate quote, state the grade, the standard, dimensions, condition, and the certificate scope. Material is supplied with a mill test certificate to EN 10204 3.1 and heat-number traceability by order scope.
Common questions
What is Grade 12 titanium used for? Heat exchangers and process equipment in hot chloride or brine service where CP Grade 2 risks crevice corrosion.
Is Grade 12 stronger than Grade 2? Yes, modestly: about 483 MPa minimum tensile versus 345 MPa for Grade 2, with similar forming.
Grade 12 or Grade 7 for crevice corrosion? Grade 12 covers hot brine and chloride crevice duty at lower cost; Grade 7 is better for strong reducing acids and costs more.
Which standards cover Grade 12? ASTM B265 for sheet and plate, B338 for tube, and B348 for bar.
Beiyu Titanium is the international titanium export brand of Jiaxing Beiyu New Materials Technology Co., Ltd., a titanium supplier & exporter with direct production backing in Baoji, Shaanxi. For a Grade 12 titanium quote with a mill test certificate to EN 10204 3.1, send the form, size and standard to [email protected]. To compare grades first, see the titanium grades comparison guide and the Grade 7 titanium page.
What to state when ordering Grade 12
Grade 12 is ordered less often than Grade 2, so fewer buyers have a house template for it, and the fields that get left blank are predictable. The alloy is defined by small deliberate additions, molybdenum 0.2 to 0.4 percent and nickel 0.6 to 0.9 percent, with oxygen at 0.25 percent maximum and iron at 0.30 percent maximum for bar (ASTM B348, chemical requirements). Those are heat analysis limits, which matters when a later product analysis is compared against them.
| Line on the order | Grade 12 specifics |
|---|---|
| Grade and UNS | Grade 12, UNS R53400, given together so the alloy is not read as unalloyed titanium |
| Product classification | Bar or billet, which decides which set of requirements applies |
| Governing standard | Named next to the grade, since the same grade appears in more than one product specification |
| Chemical requirements | Which composition table the analysis is reported to |
| Mechanical requirements | Which strength and elongation minimums are quoted |
| Surface condition | The finish as delivered, stated apart from the metallurgical condition |
| Reports required | The reporting scope, beyond the results the specification already mandates |
| Disposition of rejected material | Agreed in advance rather than negotiated after a result |
Seven of those lines sit among the items the bar and billet specification ASTM B348 expects an order to carry, which also names marking and packing that the table above leaves out; the governing standard is not on that list, and it is included here because the same grade appears in more than one product specification (ASTM B348, ordering information). Beiyu Titanium reviews the ordered combination of grade, standard, dimensions, tolerance, surface condition and inspection scope before quotation, so an enquiry that carries them can be answered without a clarification round.
Specification detail with sources
Grade 12 (UNS R53400) adds 0.2 to 0.4% molybdenum and 0.6 to 0.9% nickel to unalloyed titanium, per ASTM B265, Table 1. The additions raise the annealed minimums to 483 MPa (70 ksi) tensile and 345 MPa yield strength, per ASTM B265, Table 2, against 345 MPa and 275 MPa for Grade 2.
The Mo and Ni additions target crevice corrosion in hot chloride service. TIMET’s Corrosion Resistance of Titanium reports that, in sharp crevices in near-neutral saturated sodium chloride brine, crevice corrosion of unalloyed titanium becomes possible at about 93 °C (200 °F) and above, while it is not likely below 70 °C (158 °F); lower pH or high concentrations of calcium or magnesium ions can lower the onset temperature. Grade 12 was developed to hold resistance beyond that window while staying leaner than the palladium-bearing Grade 7.