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Size Range | 2″ – 12” |
Schedules | 20, 30, 40, Standard (STD), Extra Heavy (XH), 80, 100, 120, 140, 160, XXH & heavier |
Standard | ASTM A519 |
Grade | AISI 4140, L80, L110 |
Element | Content (%) |
Iron, Fe | 96.785 – 97.77 |
Chromium, Cr | 0.80 – 1.10 |
Manganese, Mn | 0.75 – 1.0 |
Carbon, C | 0.380 – 0.430 |
Silicon, Si | 0.15 – 0.30 |
Molybdenum, Mo | 0.15 – 0.25 |
Sulfur, S | 0.040 |
Phosphorous, P | 0.035 |
Properties | Metric | Imperial |
Tensile strength | 655 MPa | 95000 psi |
Yield strength | 415 MPa | 60200 psi |
Bulk modulus (typical for steel) | 140 GPa | 20300 ksi |
Shear modulus (typical for steel) | 80 GPa | 11600 ksi |
Elastic modulus | 190-210 GPa | 27557-30458 ksi |
Poisson’s ratio | 0.27-0.30 | 0.27-0.30 |
Elongation at break (in 50 mm) | 25.70% | 25.70% |
Hardness, Brinell | 197 | 197 |
Hardness, Knoop (converted from Brinell hardness) | 219 | 219 |
Hardness, Rockwell B (converted from Brinell hardness) | 92 | 92 |
Hardness, Rockwell C (converted from Brinell hardness. Value below normal HRC range, for comparison purposes only) | 13 | 13 |
Hardness, Vickers (converted from Brinell hardness) | 207 | 207 |
Machinability (based on AISI 1212 as 100 machinability) | 65 | 65 |
Properties | Metric | Imperial |
Density | 7.85 g/cm3 | 0.284 lb/in³ |
Melting point | 1416°C | 2580°F |
Properties | Metric | Imperial |
Thermal expansion co-efficient (@ 0-100°C/32-212°F) | 12.2 µm/m°C | 6.78 µin/in°F |
Thermal conductivity (@ 100°C) | 42.6 W/mK | 296 BTU in/hr.ft².°F |
Grade Designation | Condition | Ultimate Strength | Yield Strength | Elongation in 2 in.or 50mm,% | Rockwell,Hardness B Scale | |||
ksi | Mpa | ksi | Mpa | |||||
4140 | HR | 90 | 621 | 70 | 483 | 20 | 89 | |
SR | 105 | 724 | 85 | 586 | 10 | 95 | ||
A | 75 | 517 | 55 | 379 | 30 | 81 | ||
N | 90 | 621 | 60 | 414 | 20 | 89 |