JIS G4053 SCM 440 Low Alloy Steel Pipe Seamless Steel Tube For Machine Structural Use
JIS G4053 SCM 440 Low Alloy Steel Pipe Seamless Steel Tube For Machine Structural Use
Material
JIS G4053 SCM 440 is a low alloy steel known for its excellent mechanical properties and versatility in machine structural applications. This steel is commonly used in the manufacturing of seamless steel tubes and pipes, which are essential components in various industrial sectors.
Specification
JIS G4053 SCM 440 seamless steel tubes are designed to meet specific requirements for machine structural use. These tubes are manufactured to provide high strength, toughness, and resistance to wear and fatigue. They are typically produced in various sizes and thicknesses to cater to different engineering needs.
Key Features
- High Strength: SCM 440 offers superior tensile and yield strength, making it suitable for heavy-duty applications.
- Toughness: The material exhibits excellent toughness, which is crucial for components subjected to dynamic loads.
- Wear Resistance: Its composition provides good resistance to wear, extending the lifespan of components.
- Fatigue Resistance: Ideal for applications where cyclic loading is a concern.
- Machinability: Despite its strength, SCM 440 can be machined with relative ease, allowing for precise manufacturing.
Chemical Composition
The chemical composition of JIS G4053 SCM 440 is critical to its performance characteristics. Below is a table presenting its typical chemical composition:
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.38 - 0.43 |
| Silicon (Si) | 0.15 - 0.35 |
| Manganese (Mn) | 0.60 - 0.85 |
| Phosphorus (P) | ≤ 0.030 |
| Sulfur (S) | ≤ 0.030 |
| Chromium (Cr) | 0.90 - 1.20 |
| Molybdenum (Mo) | 0.15 - 0.30 |
Mechanical Properties
The mechanical properties of SCM 440 are essential for determining its suitability for various applications. The table below outlines its typical mechanical properties:
| Property | Value |
|---|---|
| Tensile Strength | 980 MPa min |
| Yield Strength | 835 MPa min |
| Elongation | 12% min |
| Reduction of Area | 45% min |
| Hardness (HB) | 217 - 255 |
Steel Grade
SCM 440 is a grade under the JIS G4053 standard, which specifies low alloy steels for machine structural use. It is equivalent to other international standards such as AISI 4140 and DIN 1.7225.
Application
SCM 440 seamless steel tubes are widely used in various applications, including:
- Automotive Industry: For manufacturing components like gears, shafts, and axles.
- Machinery: Used in the production of high-strength machine parts.
- Oil and Gas: Suitable for components exposed to high pressure and temperature.
- Construction: Utilized in structural applications requiring high strength and durability.
Possible Alternative Grades
While SCM 440 is a popular choice, there are alternative grades that may be considered based on specific requirements:
- AISI 4140: Similar in composition and properties, widely used in North America.
- DIN 1.7225: A European equivalent with comparable characteristics.
- EN 19: Known for its high tensile strength and toughness, often used in the UK.
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