Grade 1

Datasheet
ASTM Grade (UNS No.)GRADE 1 (R50250)
Chemical Composition (Max. values unless range is shown)(wt. %)0.08C 0.03N 0.18O 0.20Fe 0.015H
TENSILE PROPERTIESGuar.R.T. Min.Typical Elevated Temperature Properties
93˚C (200˚F)204˚C (400˚F)315˚C (600˚F)
Ultimate StrengthMPa (ksi)241 (35)262 (38)200 (29)159 (23)
Yield Strength, 0.2% offsetMPa (ksi)172 (25)138 (20)97 (14)83 (12)
Elongation in 51 mm (2″) gage length(%)24403848
Reduction in Area – Bar, Billet & Forging only(%)30
OTHER MECHANICAL PROPERTIES
Stress to Rupture in Time ShownStressMPa (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)StressMPa (ksi)90 (13)
Time-Hrs. at Temp. (˚C)1,000 (250)
Creep(%)1
Charpy V-Notch Impact @ R.T.Joules (ft-lbs)95 – 162 (70 – 120)
Bend RadiusUnder 1.78 mm (0.070″) thick1.5 x thickness
1.78 mm (0.070″) and over2.0x Thickness
Welded Bend Radius1.5- 2.0 x Thickness 70 HRB
Nominal Hardness70 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)
Densityg/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 – TensionGPa (103 ksi)103 (14.9)
Modulus of Elasticity – TorsionGPa (103 ksi)41 (6.0)
Thermal ConductivityW/m•˚C (BTU/hr•ft•˚F)20.8(12.0)
Specific HeatJ/Kg•˚C (BTU/lb•˚F)520 (0.124)
WeldabilityExcellent
Industry SpecificationsASTM – B265, B337, B338, B348, B363, B381, B861, B862, F67