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Applications
JIS - SNCM616 G4103 alloy steel bar is a kind of alloy structural steel bar specified by Japanese Industrial Standards.
Automobile Industry : It is suitable for manufacturing automobile parts that require high strength and toughness, such as gears, axles, and connecting rods. The excellent mechanical properties of the steel bar can ensure the reliable operation of automobile parts under high - stress conditions.
Aerospace Industry : In the aerospace field, it can be used to manufacture some key structural components, such as aircraft landing gear parts and engine components. Its high strength - to - weight ratio and good fatigue resistance can meet the requirements of aerospace components for high performance and reliability.
Mechanical Equipment Manufacturing : It is widely used in the manufacturing of various mechanical equipment, such as the shafts, gears, and spindles of machine tools. It can improve the working efficiency and service life of mechanical equipment.
Other Fields : It is also used in some other fields that require high - strength and high - toughness materials, such as the manufacturing of high - pressure valves, hydraulic cylinders, and railway track components.
Chemical Composition
| Element | Content Range (%) |
|---|---|
| Carbon (C) | 0.13–0.20 |
| Silicon (Si) | 0.15–0.35 |
| Manganese (Mn) | 0.8–1.2 |
| Phosphorus (P) | ≤0.03 |
| Sulfur (S) | ≤0.03 |
| Chromium (Cr) | 1.4–1.8 |
| Nickel (Ni) | 2.8–3.2 |
| Molybdenum (Mo) | 0.4–0.6 |
| Copper (Cu) | ≤0.3 |
Mechanical Properties
the mechanical properties of JIS-SNCM616 alloy steel bar:
| Property | Value | Unit | Description |
|---|---|---|---|
| Tensile Strength | ≥1180 | MPa | High resistance to tensile forces without fracture. |
| Elongation | ≥14 | % | Plastic deformation capacity before fracture; ensures ductility under stress. |
| Impact Energy (Aku) | ≥78 | J | Resistance to impact loads; reduces risk of brittle fracture. |
| Hardness | 341–415 | HB | Balances wear resistance and machinability; adjustable via heat treatment. |
heat treatment parameters of JIS-SNCM616 alloy steel bar:
| Heat Treatment | Parameters | Cooling Medium | Purpose |
|---|---|---|---|
| Quenching | 850–880°C | Water or oil | Increase hardness and strength (at the cost of increased brittleness). |
| Tempering | 550–650°C | Water or oil | Relieve internal stresses from quenching, improve toughness and plasticity. |
Notes:
Mechanical properties are typically achieved after quenching and tempering.
Heat treatment parameters may be adjusted based on specific application requirements (e.g., section thickness, desired hardness).
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