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

 
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
   
Short Time  
Long Time  

Remarks on Fabrication

 
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

 
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
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