Grade 2 vs Grade 7 vs Grade 12 Titanium Threaded Fittings
Grade 2, Grade 7 and Grade 12 titanium threaded fittings cannot be selected from a grade ranking. Each grade responds differently to chemistry, temperature and mechanical requirements, so the actual process environment must control the decision.
Grade Comparison
| Grade | Material description | Selection focus |
|---|---|---|
| Grade 2 / UNS R50400 | Commercially pure titanium | General corrosion resistance, formability and industrial availability |
| Grade 7 / UNS R52400 | Commercially pure titanium with palladium addition | Improved resistance in certain reducing-acid conditions after corrosion review |
| Grade 12 / UNS R53400 | Titanium with nickel and molybdenum | Combination of corrosion resistance and higher strength than common CP grades in selected service |
Questions Required for Grade Selection
- Process chemical and concentration
- Temperature, pressure and aeration condition
- Chlorides, oxidizers, reducing contaminants and deposits
- Continuous, intermittent or upset exposure
- Crevice geometry and stagnant zones
- Mating materials and galvanic conditions
- Required strength and governing code
Grade Is Only One Part of the Order
After selecting a candidate grade, specify the exact threaded fitting, NPS at every port, thread system, sealing arrangement, inspection and traceability. A certificate for the correct alloy does not correct an unsuitable fitting configuration or thread.
Need a Grade Review?
Send the complete medium, concentration, temperature, pressure, fitting type, thread, quantity and required documents. Final material approval remains with the purchaser or responsible engineer.
Related Technical Reading
Titanium Threaded Fitting Types · Titanium Threaded Fitting Applications · NPT vs BSPT vs BSPP · Preventing Titanium Thread Galling