Grade 4
Datasheet
| ASTM Grade (UNS No.) | GRADE 4 (R50550) | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Chemical Composition (Max. values unless range is shown) | (wt. %) | 0.08C; 0.05N; 0.40O; 0.50Fe; 0.015H | ||||||||
| TENSILE PROPERTIES | Guar.R.T. Min. | Typical Elevated Temperature Properties | ||||||||
| 93˚C (200˚F) | 204˚C (400˚F) | 315˚C (600˚F) | 426˚C (800˚F) | |||||||
| Ultimate Strength | MPa (ksi) | 552 (80) | 538 (78) | 365 (53) | 283 (41) | 214 (31) | ||||
| Yield Strength, 0.2% offset | MPa (ksi) | 483 (70) | 421 (61) | 255 (37) | 172 (25) | 145 (21) | ||||
| Elongation in 51 mm (2") gage length | (%) | 15 | 23 | 25 | 28 | 26 | ||||
| Reduction in Area - Bar, Billet & Forging only | (%) | 25 | ||||||||
| OTHER MECHANICAL PROPERTIES | ||||||||||
| Stress to Rupture in Time Shown | Stress | MPa (ksi) | 462 (67) | 330 (48) | 200 (29) | 241 (35) | ||||
| Time-Hrs. at Temp. (˚C) | 1,000 (25) | 10,000 (100) | 1,000 (315) | 10,000 (250) | ||||||
| Stress &Time to Produce Elongation Shown (creep) | Stress | MPa (ksi) | 283 (41) | 188 (27) | 116 (17) | 200 (29) | ||||
| Time-Hrs. at Temp. (˚C) | 1,000 (25) | 1,000 (100) | 1,000 (200) | 1,000 (315) | ||||||
| Creep | (%) | 1 | 0.1 | 0.1 | 1 | |||||
| Charpy V-Notch Impact @ R.T. | Joules (ft-lbs) | 13 - 27 (10 - 20) | ||||||||
| Bend Radius | Under 1.78 mm (0.070") thick | 2.5 x Thickness | ||||||||
| 1.78 mm (0.070") and over | 3.0 x Thickness | |||||||||
| Welded Bend Radius | 3.0 - 5.0 x Thickness | |||||||||
| Nominal Hardness | 100 HRB | |||||||||
| PHYSICAL PROPERTIES | ||||||||||
| Nominal Beta Transus | °C (°F) | 949 (1740) | ||||||||
| 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) | 9.7 (5.4) | |||||||||
| 0-648˚C (32-1200˚F) | 10.1 (5.6) | |||||||||
| 0-816˚C (32-1500˚F) | 10.1 (5.6) | |||||||||
| Density | g/cm3 (lbs/in3) | 4.51(0.163) | ||||||||
| Melting Point, Approx. | °C (°F) | 1660 (3020) | ||||||||
| Electrical Resistivity @ R.T. | 10-6 ohm•cm (10-6 ohm•in) | 60 (24) | ||||||||
| Modulus of Elasticity – Tension | GPa (103 ksi) | 105 (15.2) | ||||||||
| Modulus of Elasticity – Torsion | GPa (103 ksi) | 45 (6.5) | ||||||||
| Thermal Conductivity | W/m•˚C (BTU/hr•ft•˚F) | 17.3 (10.0) | ||||||||
| Specific Heat | J/Kg•˚C (BTU/lb•˚F) | 540 (0.129) | ||||||||
| Weldability | Good | |||||||||
| Industry Specifications | ASTM - B265, B348, B381, F67; AMS 4901 and 4921 | |||||||||