18CrNiMo7-6 Case Hardened Tubing Alloy Structural Steel Pipe For Engine Drive Shaft
18CrNiMo7-6 Case Hardened Tubing Alloy Structural Steel Pipe For Engine Drive Shaft
Material Specification
18CrNiMo7-6 is a high-quality alloy structural steel known for its excellent case hardening properties. It is widely used in the manufacturing of engine drive shafts due to its superior strength, toughness, and wear resistance. This steel grade is particularly suitable for components that require high surface hardness and a tough core.
Key Features
- High Strength and Toughness: Offers excellent mechanical properties, making it ideal for demanding applications.
- Wear Resistance: Provides superior wear resistance due to its case hardening capabilities.
- Good Machinability: Despite its hardness, it can be machined effectively.
- Versatility: Suitable for various applications beyond engine drive shafts, including gears and other mechanical components.
Chemical Composition
The chemical composition of 18CrNiMo7-6 is crucial for its performance characteristics. Below is a table detailing its typical composition:
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.15 - 0.21 |
| Silicon (Si) | 0.15 - 0.40 |
| Manganese (Mn) | 0.50 - 0.90 |
| Phosphorus (P) | ≤ 0.025 |
| Sulfur (S) | ≤ 0.035 |
| Chromium (Cr) | 1.50 - 1.80 |
| Nickel (Ni) | 1.40 - 1.70 |
| Molybdenum (Mo) | 0.25 - 0.35 |
Mechanical Properties
The mechanical properties of 18CrNiMo7-6 are essential for its application in structural components. Here is a table summarizing its typical mechanical properties:
| Property | Value |
|---|---|
| Tensile Strength | 800 - 1100 MPa |
| Yield Strength | ≥ 600 MPa |
| Elongation | ≥ 10% |
| Hardness (after case hardening) | 58 - 62 HRC |
Similar Standards and Steel Grades
18CrNiMo7-6 is comparable to several international standards and steel grades. Here are some equivalents:
- ASTM: AISI 9310
- EN: 18CrNiMo7-6
- GOST: 18ХНМФА
- JIS: SNCM420
- GB: 20CrNiMo
Application
18CrNiMo7-6 is primarily used in the automotive and aerospace industries for components that require high strength and wear resistance. Its applications include:
- Engine Drive Shafts: Due to its high strength and toughness, it is ideal for drive shafts that undergo significant stress.
- Gears: Used in the manufacturing of gears that require a hard surface and a tough core.
- Bearings: Suitable for bearings that need to withstand high loads and rotational speeds.
- Mechanical Components: Utilized in various mechanical components where durability and reliability are critical.
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