Grade 2 Technical Data

Principal Uses

Airframe applications, skins, chemical industry applications where maximum formability required with moderate strength

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 0.020% max Fe, 0.25 max O

Type Structure

Alpha

Mechanical Properties

Guaranteed RT Minimum Typical Strength (%RT) & Ductibility
200F 400F 600F 800F 1000F
Ultimate Tensile Strength, psi 50,000 80 57 46 36 28
Yield Strength, 0.2% offset, psi 40,000 76 46 30 26 20
El in 2" (> 0.025" thick), pct 22 ➁   42 37 25 31
Reduction of Area, percent 35 ➂   57 76 76 75
Bend Radius 2T ➃ 2.5T ➄          
Impact, Charpy V, ft-lb, Room Temperature            
Welded Bend Radius Approx. 2-3 T          
Hardness Brinell 200          
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 14.9
Modulus of Elasticity, psi (106) torsion Approx. 6.5
Density, lb / cu inch 0.163
Melting Range, deg F 3000-3100F
Specific Electrical Resistivity
micro ohms/cm/sq cm
56
Specific Heat, Btu/lb/deg F 0.125 at room temperature
Thermal Conductivity, Btu/hr.ft2-deg F/ft Approx. 9.5 at room temperature
Mean Coefficient of
Thermal Expansion
per deg F. (10-6)
32 - 212F 4.8
32 - 600F 5.1
32 - 1000F 5.4
32 - 1200F 5.6
32 - 1500F 5.6
Oxidation Characteristics
in Air
  400F 600F 800F 1000F
Short Time Good Good Good Moderate
Long Time Good Good Slight Moderate

Remarks on Fabrication

 
Beta Transus 1675±25F
Cutting Readily cut with saw or abrasive wheel
Machinging Rigid set-up, slow speed, heavy feed, sharp tools, adequate coolant
Forming Readily formable at room temperature. Complex shapes require heat
Joining, Welding Completely weldable; fusion welding requires protection

Remarks on Heat Treatment

 
Initial Forging Approx. 1650F rough breakdown, finish 1550F
Sheet - Strip - Plate
Annealing - Bars and Forgings
1200 - 1500F, 15 - 120 min, air cool slower
1200 - 1450F, 1 - 2 hours, air cool or slower
Solution Treating Not Applicable
Aging Not Applicable
Stress Relief Annealing 900 - 1000F, 45 min

Notes and General Remarks

➀ 0.0125% max H (bar) 0.0100% max (billet) ➁ Sheet ➂ Bar ➃ < 0.070 inch thick ➄ > 0.070 inch thick