Grade 23 Technical Data
Principal Uses |
Liquid hydrogen tankage - Principal Uses: Surgical appliances & implants, orthopedic implants, etc. | |||
Available Forms |
Sheet, strip, plate, bar, billet, wire, extrusions, and tubing | |||
Nominal Composition |
0.08% max C, 0.05% max N, 0.015% max H (sheet) ➀ 0.013% max O, 5.5-6.5% AL, 3.5-4.5% V, 0.25% max Fe | |||
Type Structure |
Alpha-Beta | |||
Mechanical Properties |
Guaranteed RT Minimum | Typical Properties at | ||
| -320F | -423F | |||
| Ultimate Tensile Strength, psi | 130,000 | 218,000 | 263,000 | |
| Yield Strength, 0.2% offset, psi | 120,000 | 202,000 | 248,000 | |
| El in 2" (> 0.025" thick), pct | 10 ➁ | 13.5 | 6 | |
| Reduction of Area, percent | ||||
| Bend Radius | 4.5T ➂ %t ➃ | |||
| Impact, Charpy V, ft-lb, Room Temperature | 19 | |||
| Welded Bend Radius | 6-10 T | |||
| Hardness | Rc 30/34 | |||
| Rupture, Stress to Produce in ( ) hr, psi | ||||
| Creep Data, Stress to Produce ( ) percent elongation in ( ) hr, psi | ||||
Physical Properties |
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| Modulus of Elasticity, psi (106) tension | 16.5 | |||
| Modulus of Elasticity, psi (106) torsion | Approx. 6.10 | |||
| Density, lb / cu inch | 0.160 | |||
| Melting Range, deg F | Approx. 3000F | |||
| Specific Electrical Resistivity micro ohms/cm/sq cm |
171 at room temperature | |||
| Specific Heat, Btu/lb/deg F | 0.135 at room temperature | |||
| Thermal Conductivity, Btu/hr.ft2-deg F/ft | ||||
| Mean Coefficient of Thermal Expansion per deg F. (10-6) |
32 - 212F | 5.3 | ||
| 32 - 600F | 5.3 | |||
| 32 - 1000F | 5.3 | |||
| 32 - 1200F | 5.5 | |||
| 32 - 1500F | 5.7 | |||
| Oxidation Characteristics in Air |
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| Short Time | ||||
| Long Time | ||||
Remarks on Fabrication |
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| Beta Transus | 1820±25F | |||
| Cutting | Readily cut with saw or abrasive wheel | |||
| Machinging | Rigid set-up, slow speed, heavy feed, sharp tools, adequate coolant | |||
| Forming | Formable; warm forming useful with solution treated material | |||
| Joining, Welding | Sound ductile welds if protected | |||
Remarks on Heat Treatment |
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| Initial Forging | 1800F - 1820F, no higher than 1750F to finish | |||
| Sheet - Strip - Plate Annealing - Bars and Forgings |
1300 - 1600F, 15 - 60 min, air cool slower 1300 - 1450F, 1 - 2 hours, air cool or slower |
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| Solution Treating | Not Applicable | |||
| Aging | Not Applicable | |||
| Stress Relief Annealing | 900 - 1200F, 1 - 4 hr, AC | |||
Notes and General Remarks |
➀ 0.0125% max H (bar), 0.0100% max H (billet) ➁ 0.020 and below 8%; 10% for plate; determined by configuration of bar and forgings ➂ < 0.070 inch ➃ > 0.070 inch | |||