Overview of Special Steel 25CrMo4/1.7218/SCM430 Alloy Steel
Are you curious about a steel that balances strength and versatility? Meet Special Steel 25CrMo4, also known by its aliases 1.7218 and SCM430. This alloy steel is celebrated for its high strength, toughness, and excellent machinability, making it a top choice across various industries. Whether you’re in automotive manufacturing, aerospace engineering, or machinery production, 25CrMo4 stands out as a robust and reliable material.
Types, Composition, Properties, and Characteristics
Chemical Composition of Special Steel 25CrMo4/1.7218/SCM430 Alloy Steel
Understanding the chemical makeup is key to appreciating what makes 25CrMo4 so special. This steel’s unique composition enhances its mechanical properties, making it suitable for demanding applications.
| Element | Percentage |
|---|---|
| Carbon (C) | 0.22-0.29% |
| Silicon (Si) | 0.15-0.35% |
| Manganese (Mn) | 0.60-0.90% |
| Phosphorus (P) | ≤ 0.025% |
| Sulfur (S) | ≤ 0.035% |
| Chromium (Cr) | 0.90-1.20% |
| Molybdenum (Mo) | 0.15-0.30% |
Mechanical Properties and Characteristics
The chemical composition directly influences the mechanical properties. Here’s a snapshot of the key characteristics that make 25CrMo4 a standout alloy steel.
| Property | Value |
|---|---|
| Tensile Strength | 850-1000 MPa |
| Yield Strength | 700-850 MPa |
| Elongation | 14-17% |
| Impact Toughness | ≥ 41 J at -20°C |
| Hardness (annealed) | 217 HB max |
| Modulus of Elasticity | 210 GPa |
| Density | 7.85 g/cm³ |
| Thermal Conductivity | 38.7 W/m·K (at 20°C) |
Applications of Special Steel 25CrMo4/1.7218/SCM430 Alloy Steel
Where is this steel used? Let’s explore the diverse applications of 25CrMo4 across various industries.
| Industry | Application |
|---|---|
| Automotive | Crankshafts, gears, and axle shafts |
| Aerospace | Landing gear components, engine parts |
| Machinery Manufacturing | Hydraulic machinery, machine tools |
| Oil and Gas | Drilling rigs, pressure vessels |
| Defense | Military vehicles, artillery components |
| General Engineering | Structural components requiring high strength and toughness |
Specifications, Sizes, Grades, and Standards
Common Specifications and Standards
To ensure quality and performance, 25CrMo4 alloy steel adheres to stringent standards.
| Standard | Designation |
|---|---|
| EN | 1.7218 |
| DIN | 25CrMo4 |
| ASTM | A29 |
| JIS | SCM430 |
| ISO | 683-1 |
Available Sizes and Grades
The versatility of 25CrMo4 is reflected in its range of sizes and grades, tailored to meet specific needs.
| Form | Size Range |
|---|---|
| Round Bars | 6mm to 350mm |
| Square Bars | 20mm to 200mm |
| Plates | Thickness: 10mm to 150mm |
| Sheets | Thickness: 2mm to 50mm |
| Tubes | OD: 13.7mm to 323.9mm; WT: 1.5mm to 40mm |
Suppliers and Pricing Details
Top Suppliers
Finding a reliable supplier is crucial for ensuring the quality and consistency of 25CrMo4 alloy steel.
| Supplier | Region | Contact Information |
|---|---|---|
| Thyssenkrupp | Global | [email protected] |
| Voestalpine | Europe, Americas | [email protected] |
| Baosteel | Asia | [email protected] |
| ArcelorMittal | Global | [email protected] |
| Nippon Steel Corporation | Japan, Global | [email protected] |
Pricing Overview
The cost of 25CrMo4 alloy steel can vary based on factors such as size, quantity, and market conditions.
| Form | Price Range (USD/kg) |
|---|---|
| Round Bars | $2.50 – $4.00 |
| Plates | $3.00 – $5.00 |
| Sheets | $2.80 – $4.50 |
| Tubes | $3.20 – $5.50 |
Comparing Pros and Cons, Advantages and Limitations
Advantages of 25CrMo4 Alloy Steel
What makes this steel a favorite? Let’s dive into its advantages.
| Advantage | Explanation |
|---|---|
| High Strength | Excellent tensile and yield strength for demanding applications |
| Good Toughness | Maintains impact resistance even at low temperatures |
| Versatility | Suitable for a wide range of industrial uses |
| Machinability | Easier to machine compared to many other high-strength steels |
| Heat Treatable | Properties can be enhanced through heat treatment processes |
Limitations of 25CrMo4 Alloy Steel
No material is without its drawbacks. Here’s what to consider.
| Limitation | Explanation |
|---|---|
| Cost | More expensive than lower-grade steels |
| Corrosion Resistance | Requires coating or treatment to improve corrosion resistance |
| Availability | May not be as readily available in all regions |
| Welding | Requires careful pre and post-weld heat treatment |
FAQ
| Question | Answer |
|---|---|
| What is 25CrMo4 steel? | 25CrMo4 is a high-strength alloy steel known for its toughness, versatility, and machinability. |
| How does 25CrMo4 compare to other alloy steels? | It offers a balance of strength and machinability, often outperforming other steels in these areas. |
| What industries use 25CrMo4 alloy steel? | Commonly used in automotive, aerospace, machinery manufacturing, oil and gas, and defense. |
| Can 25CrMo4 steel be welded? | Yes, but it requires specific pre and post-weld heat treatments to maintain its properties. |
| What are the main standards for 25CrMo4 steel? | EN 1.7218, DIN 25CrMo4, ASTM A29, JIS SCM430, and ISO 683-1 are some of the key standards. |
Conclusion
Special Steel 25CrMo4, also known as 1.7218 and SCM430, stands out as a versatile and robust alloy steel. Its high strength, toughness, and excellent machinability make it a go-to material across numerous industries, from automotive to aerospace. While it comes with its set of limitations, the advantages often outweigh the drawbacks, especially in applications requiring high performance and reliability.
So, whether you’re designing a critical component in an aircraft or crafting durable machinery parts, 25CrMo4 alloy steel is a solid choice to consider. Dive into the world of alloy steels and discover how 25CrMo4 can meet your project’s demands with flying colors.
