Grade 27
Datasheet
ASTM Grade (UNS No.) | GRADE 27 (R52254)) | |||||
---|---|---|---|---|---|---|
Chemical Composition (Max. values unless range is shown) |
(wt. %) | 0.08C; 0.03N; 0.18O; 0.20Fe; 0.08-0.14Ru; 0.015H | ||||
TENSILE PROPERTIES | Guar.R.T. Min. | Typical Elevated Temperature Properties | ||||
93˚C (200˚F) | 204˚C (400˚F) | 315˚C (600˚F) | ||||
Ultimate Strength | MPa (ksi) | 241 (35) | 262 (38) | 200 (29) | 159 (23) | |
Yield Strength, 0.2% offset | MPa (ksi) | 172 (25) | 138 (20) | 97 (14) | 83 (12) | |
Elongation in 51 mm (2") gage length | (%) | 24 | 40 | 38 | 48 | |
Reduction in Area - Bar, Billet & Forging only | (%) | 30 | ||||
OTHER MECHANICAL PROPERTIES | ||||||
Stress to Rupture in Time Shown | Stress | MPa (ksi) | 195 (28) | 152 (22) | 97 (14) | |
Time-Hrs. at Temp. (˚C) | 10,000 (100) | 10,000 (200) | 1,000 (250) | |||
Stress &Time to Produce Elongation Shown (creep) | Stress | MPa (ksi) | 90 (13) | |||
Time-Hrs. at Temp. (˚C) | 1,000 (250) | |||||
Creep | (%) | 1.0 | ||||
Charpy V-Notch Impact @ R.T. | Joules (ft-lbs) | 95 - 162 (70 - 120) | ||||
Bend Radius | Under 1.78 mm (0.070") thick | 1.5 x Thickness | ||||
1.78 mm (0.070") and over | 2.0 x Thickness | |||||
Welded Bend Radius | 1.5 - 2.0 x Thickness | |||||
Nominal Hardness | 70 HRB | |||||
PHYSICAL PROPERTIES | ||||||
Nominal Beta Transus | °C (°F) | 890 (1630) | ||||
Coefficient of Thermal Expansion 10-6/˚C (10-6/˚F) | 0-100˚C (32 -212˚F) | 8.6 (4.8) | ||||
0-315˚C (32-600˚F) | 9.2 (5.1) | |||||
0-538˚C (32-1000˚F) | 9.5 (5.3) | |||||
0-648˚C (32-1200˚F) | 9.9 (5.5) | |||||
0-816˚C (32-1500˚F) | 9.9 (5.5) | |||||
Density | g/cm3 (lbs/in3) | 4.51(0.163) | ||||
Melting Point, Approx. | °C (°F) | 1670 (3040) | ||||
Electrical Resistivity @ R.T. | 10-6 ohm•cm (10-6 ohm•in) | 54 (21) | ||||
Modulus of Elasticity – Tension | GPa (103 ksi) | 103 (14.9) | ||||
Modulus of Elasticity – Torsion | GPa (103 ksi) | 41 (6.0) | ||||
Thermal Conductivity | W/m•˚C (BTU/hr•ft•˚F) | 20.8 (12.0) | ||||
Specific Heat | J/Kg•˚C (BTU/lb•˚F) | 520 (0.124) | ||||
Weldability | Excellent | |||||
Industry Specifications | ASTM - B265, B337, B338, B348, B363, B381, B861 and B862 |