Full Transcript:
What’s up everyone? This is Michael with Michael Talks Metal! You guys ready for a little more talk on Titanium today? Let’s jump in.
Today we are continuing our series on Titanium with the unalloyed grades aka commercially pure (CP). If you did not see last week’s introduction to Titanium, you can click here to see it.
Four levels of purity are designated by ASTM standards as grade 1 (highest purity) to grade 4 (lowest purity).
Strength trends in the inverse order, highest strength in grade 4 to lowest in grade 1. Impurities contribute solid solution strengthening in the single phase alpha structure.
General corrosion resistance is very good in all but in the more aggressive environments higher purity grades perform better.
Is commercially pure Titanium Magnetic? Good question. All CP titanium grades are non-magnetic with a density of point 163 lbs per cubic inch.
Mean coefficient of thermal expansion from 70-212° deg F – 4.8 micro inch per inch per deg F
Chemical composition and UNS designation for each grade:
| ASTM Grade | Grade 1 | Grade 2 | Grade 3 | Grade 4 |
| UNS Designation | R50250 | R50400 | R50550 | R50700 |
| Chemistry | ||||
| Element | Weight % Maximum | |||
| Oxygen | 0.18% | 0.25% | 0.35% | 0.40% |
| Nitrogen | 0.03% | 0.03% | 0.05% | 0.05% |
| Carbon | 0.08% | 0.08% | 0.08% | 0.08% |
| Iron | 0.20% | 0.30% | 0.30% | 0.50% |
| Hydrogen | 0.015% | 0.015% | 0.015% | 0.015% |
| Residuals, Each | 0.10% | 0.10% | 0.10% | 0.10% |
| Residuals, Total | 0.40% | 0.40% | 0.40% | 0.40% |
| Titanium | Remainder | |||
| Grade | 1 | 2 | 3 | 4 |
| Beta Transus | 1640° | 1680° | 1690° | 1740° |
| Typical Mechanical Properties | ||||
| Yield Strength (psi) | 35,000 | 50,000 | 65,000 | 80,000 |
| Tensile Strength (psi) | 50,000 | 70,000 | 85,000 | 98,000 |
| Elongation (%) | 35 | 28 | 25 | 23 |
| Reduction of Area (%) | 70 | 57 | 48 | 46 |
Commercially pure titanium has numerous ASTM, ASME, AMS, and MIL specifications by product form. These specifications and any part requirements can vary from what we have shown you here today, so as we have said many times before….
Never forget to Check the specs!!!!! (check the specs) Twice. So this is Michael with Michael Talks Metal. Michlin Metals is a supplier of Titanium products. Any questions please visit us at our website www.michlinmetals.com. Thanks for watching and if you made it this far and have yet to do so, please subscribe, here. If you missed last weeks’ video about the Intro to Titanium, check it out here. Thanks for watching, see you next Thursday 10am! I’m out.
