**Mechanical Properties and Chemical Composition of 27SiMn Seamless Steel Tube**
Below is a detailed overview of the mechanical properties and chemical composition of the 27SiMn seamless steel tube, which is commonly used in high-strength applications due to its excellent toughness and wear resistance.
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### **Chemical Composition (Mass Fraction, %)**
| Element | Range |
|---------|---------------|
| C | 0.24–0.32 |
| Si | 1.10–1.40 |
| Mn | 1.10–1.40 |
| Cr | — |
| Mo | — |
| Ni | — |
| B | — |
| V | — |
| Other | — |
This alloy is known for its balanced combination of strength and ductility, making it suitable for structural and mechanical components under high stress.
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### **Technical Specifications**
| Parameter | Value |
|---------------------------|--------------------------------|
| Steel Group | SiMn |
| Sequence Number | 8 |
| Unified Number | A1O272 |
| Word Code | 27SiMn |
| Grade | 27SiMn |
| Nominal Size (mm) | 25 |
| Heat Treatment | Annealed or High-Temperature Tempered |
| Brinell Hardness (HBS 100/3000) | ≤ 217 |
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### **Mechanical Properties**
| Property | Value |
|------------------------------|--------------|
| Tensile Strength (σb) | ≥ 980 MPa |
| Yield Point (σs) | ≥ 835 MPa |
| Elongation after Fracture (δ5) | ≥ 12% |
| Section Shrinkage (ψ) | ≥ 40% |
| Impact Work (Aku2) | ≥ 39 J |
The material is typically heat-treated by quenching and tempering. The process involves:
- **Quenching Temperature**: 920°C
- **Coolant**: Water or Oil
- **Tempering Temperature**: 450°C
- **Coolant**: Water or Oil
This treatment ensures the material achieves the desired balance of hardness, strength, and toughness.
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The 27SiMn seamless steel tube is widely used in automotive, construction, and industrial machinery due to its superior mechanical performance and durability. It is ideal for applications requiring high tensile strength and good impact resistance.
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