4140 Hot Rolled Steel Round Bar
4140 Hot Rolled Steel Round Bar Cold Rolled/hollow Bar
Material:AISI4140/SAE4140/SCM440/42CrMo/42CrMo4
Length: Max 20m
Shape: Round bar
OD Diameter: From 6mm to 1000mm
Heat treatment: Quenched and Tempered (+QT), Normalizing (+N), Annealing (+A)
Surface finish:Black / Rough turned / Peeled
Applications: Typical applications for this grade include drill collars, pins, axles, bolts, and shafts.
About 4140
4140 hot rolled steel round bar is a medium carbon alloy steel with good fatigue and impact resistance after heat treating.
4140 hot rolled steel has many applications, including drill collars, chain pins, bolts and sprockets.
4140 HRA is a chromium-molybdenun alloy steel that can be oil hardened to relatively high hardenability. The chromium content provides good hardness penetration, and the molybdenum imparts uniformity of hardness and high strength.
Through variations in the method of heat treating 4140, an exceptionally wide range of properties can be attained. Other desirable properties include good wear resistance, excellent toughness and good ductility in the quenched and tempered condition.
4140 can attain high mechanical properties (260,000 psi tensile and 235,000 psi yield) in the hardened condition of 500 Brinell.
4140 Hot Rolled Steel Round Bar Chemical Properties and Mechanical Properties
| Performance Category | Specific Performance | Value |
|---|---|---|
| Chemical Composition | Carbon (C) | 0.38% – 0.43% |
| Silicon (Si) | 0.15% – 0.30% | |
| Manganese (Mn) | 0.75% – 1.0% | |
| Phosphorus (P) | ≤ 0.035% | |
| Sulfur (S) | ≤ 0.040% | |
| Chromium (Cr) | 0.80% – 1.10% | |
| Molybdenum (Mo) | 0.15% – 0.25% | |
| Iron (Fe) | Balance | |
| Physical Properties | Density | 7.85 g/cm³ |
| Melting Point | 1416℃ | |
| Mechanical Properties | Tensile Strength | 655 MPa |
| Yield Strength | 415 MPa | |
| Elastic Modulus | 190 – 210 GPa | |
| Poisson’s Ratio | 0.27 – 0.30 | |
| Elongation at Break (50mm Gauge Length) | 25.70% | |
| Brinell Hardness | 197 | |
| Knoop Hardness (Converted from Brinell Hardness) | 219 | |
| Rockwell Hardness B (Converted from Brinell Hardness) | 92 | |
| Rockwell Hardness C (Converted from Brinell Hardness) | 13 | |
| Vickers Hardness (Converted from Brinell Hardness) | 207 |
Applications
Hydraulic Machinery
Oil & Gas Exploration and production
Construction & Aerospace
