### **440 Stainless Steel Flat Bar Overview**

The **440 stainless steel flat bar** is a **premium-grade martensitic stainless steel** known for its exceptional **wear resistance, hardness, and corrosion protection**. Manufactured through precise hot rolling and annealing processes, this high-quality flat bar is ready for grinding, forging, or other fabrication applications. Compliant with stringent German standards, it ensures consistent quality and reliability across all production batches.

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### **Key Features**

- **Superior Hardening Capabilities**: Achieves high hardness levels through heat treatment.

- **Outstanding Wear Resistance**: Ideal for high-stress applications.

- **High Corrosion Resistance**: Performs well in demanding environments.

- **Excellent Edge Retention**: Perfect for cutting tools and precision instruments.

- **Consistent Material Properties**: Ensures reliability across all batches.

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### **Chemical Composition (Weight %)**

| Element       | Cr       | C        | Mn       | Si       | P        | S        | Mo       | Fe       |

|---------------|----------|----------|----------|----------|----------|----------|----------|----------|

| **Percentage**| 16.0-18.0| 0.60-1.20| ≤1.00    | ≤1.00    | ≤0.04    | ≤0.03    | ≤0.75    | Balance  |

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### **Mechanical Properties**

| Condition      | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness (HRC) |

|----------------|------------------------|-----------------------|----------------|----------------|

| **Annealed**   | 750 - 850             | 450                   | 20             | ≤25            |

| **Quenched & Tempered** | 1650 - 1900      | 1450                  | 5              | 56 - 60        |

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### **Specifications and Dimensions**

#### **Standard Dimensions**

| Thickness (mm) | Width (mm)  | Length (mm)  | Tolerance (mm) | Surface Finish       |

|----------------|-------------|--------------|----------------|----------------------|

| 5 - 10         | 20 - 100    | 2000 - 6000  | ±0.1           | Bright / Polished    |

| 10 - 20        | 50 - 200    | 2000 - 6000  | ±0.2           | Bright / Polished    |

| 20 - 30        | 100 - 300   | 2000 - 6000  | ±0.3           | Bright / Polished    |

| 30 - 50        | 200 - 500   | 2000 - 6000  | ±0.5           | Bright / Polished    |

#### **Available Standards**

| Standard       | Description                          |

|----------------|--------------------------------------|

| **ASTM A276**  | Standard specification for stainless steel bars and shapes. |

| **DIN 1.4125** | German standard for martensitic stainless steel. |

| **UNS S44004** | Unified Numbering System designation for 440 stainless steel. |

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### **Applications**

The **440 stainless steel flat bar** is widely used in industries requiring high hardness, wear resistance, and corrosion resistance. Common applications include:

- **Premium Cutlery Manufacturing**

- **Precision Cutting Tools**

- **High-End Knives**

- **Surgical Instruments**

- **Bearings and Valves**

- **Industrial Blades**

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### **Historical Significance**

- **Industry Standard Since the 1980s**: A trusted material for high-performance applications.

- **Legacy in Cutlery**: Preferred for premium knife manufacturing due to its edge retention and durability.

- **Precision Tooling**: Essential for applications requiring sharp edges and long-lasting performance.

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### **Key Benefits**

- **Exceptional Hardness**: Achieves high hardness levels through heat treatment.

- **Superior Wear Resistance**: Ideal for high-stress and high-friction applications.

- **Corrosion Resistance**: Performs well in demanding environments.

- **Versatility**: Suitable for a wide range of industrial and precision applications.

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### **Conclusion**

The **440 stainless steel flat bar** is a premium material designed for applications requiring exceptional hardness, wear resistance, and corrosion resistance. Its unique properties make it a preferred choice for industries such as cutlery manufacturing, precision tooling, and surgical instruments. Whether for high-end knives or industrial blades, 440 stainless steel delivers unmatched performance and reliability.

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### **Additional Information**

#### **Heat Treatment Options**

- **Annealing**: Softens the material for machining.

- **Quenching & Tempering**: Enhances hardness and wear resistance.

- **Polishing**: Improves surface finish and corrosion resistance.

#### **Surface Finish Options**

- **Bright**: Smooth and reflective finish.

- **Polished**: High-gloss finish for aesthetic applications.

- **Black**: Oxidized finish for added protection.

Let us help you find the perfect **440 stainless steel flat bar** solution for your project!