SAE4130 SAE4140 Mechanical Precision Steel Tubes
Key Features
SAE4130 and SAE4140 are low-alloy steel grades that are widely used in the manufacturing of mechanical precision steel tubes. These grades are known for their excellent strength, toughness, and wear resistance, making them suitable for a variety of demanding applications. The precision tubes made from these steels are characterized by their high dimensional accuracy, smooth surface finish, and consistent mechanical properties.
SAE4130 is a chromium-molybdenum alloy steel with good weldability and machinability. It is often used in applications where high strength and toughness are required. SAE4140, on the other hand, contains a higher carbon content than SAE4130, providing enhanced hardness and strength. Both grades are heat-treatable, allowing for further enhancement of their mechanical properties.
Chemical Composition
| Element | SAE4130 (%) | SAE4140 (%) |
| Carbon (C) | 0.28 - 0.33 | 0.38 - 0.43 |
| Manganese (Mn) | 0.40 - 0.60 | 0.75 - 1.00 |
| Phosphorus (P) | ≤ 0.035 | ≤ 0.035 |
| Sulfur (S) | ≤ 0.040 | ≤ 0.040 |
| Silicon (Si) | 0.15 - 0.35 | 0.15 - 0.35 |
| Chromium (Cr) | 0.80 - 1.10 | 0.80 - 1.10 |
| Molybdenum (Mo) | 0.15 - 0.25 | 0.15 - 0.25 |
Mechanical Properties
| Property | SAE4130 | SAE4140 |
| Tensile Strength (MPa) | 560 - 670 | 655 - 860 |
| Yield Strength (MPa) | 460 | 415 - 655 |
| Elongation (%) | 21 | 25 |
| Hardness (HB) | 197 | 197 - 241 |
Physical Properties
| Property | SAE4130 | SAE4140 |
| Density (g/cm³) | 7.85 | 7.85 |
| Modulus of Elasticity (GPa) | 205 | 205 |
| Thermal Conductivity (W/m·K) | 42.7 | 42.7 |
| Specific Heat (J/kg·K) | 477 | 477 |
Process Performance
| Process | SAE4130 | SAE4140 |
| Weldability | Good | Fair |
| Machinability | Good | Good |
| Formability | Good | Fair |
| Heat Treatment | Excellent | Excellent |
Steel Grade
SAE4130 and SAE4140 are part of the SAE-AISI system, which classifies steels based on their chemical composition. These grades are part of the 41xx series, known for their chromium and molybdenum content, which enhance their mechanical properties. SAE4130 is often chosen for its balance of strength and ductility, while SAE4140 is selected for applications requiring higher hardness and strength.
Application
These precision steel tubes are used in a variety of industries, including:
Automotive: For manufacturing components like axles, crankshafts, and gears.
Aerospace: In the production of landing gear and structural components.
Oil and Gas: For drill collars and other downhole tools.
Construction: In heavy machinery and structural applications.
Possible Alternative Grades
While SAE4130 and SAE4140 are popular choices, there are alternative grades that may be considered based on specific application requirements:
SAE4145: Offers higher strength and hardness than SAE4140.
SAE4340: Known for its high toughness and strength, suitable for heavy-duty applications.
EN19: A European equivalent to SAE4140, offering similar properties.
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