Description
EN 10297-1 34CrMo4 (1.7220) Alloy Seamless Steel Pipe
Introduction
The EN 10297-1 standard specifies the technical delivery conditions for seamless circular steel tubes for mechanical and general engineering purposes. This article focuses on the alloy seamless steel pipe grades 34CrMo4 (1.7220) and 42CrMo4 (1.7225), which are commonly used in various industries due to their excellent mechanical properties and versatility.
Material and Specification
The material used in the production of EN 10297-1 34CrMo4 (1.7220) and 42CrMo4 (1.7225) alloy seamless steel pipes is chromium-molybdenum steel. These pipes are manufactured through a hot forming process and are available in various sizes, thicknesses, and lengths to suit different application requirements.
Key Features
The key features of EN 10297-1 34CrMo4 (1.7220) and 42CrMo4 (1.7225) alloy seamless steel pipes include:
- High Strength: These steel pipes exhibit high tensile strength, making them suitable for applications that require robust and durable materials.
- Excellent Toughness: The alloy composition provides exceptional toughness, ensuring resistance to impact and fatigue.
- Good Weldability: These pipes can be easily welded using conventional methods, allowing for easy fabrication and installation.
- Heat Resistance: The chromium and molybdenum content in the alloy enhances its resistance to high temperatures, making it suitable for applications involving elevated temperatures.
- Versatility: EN 10297-1 34CrMo4 (1.7220) and 42CrMo4 (1.7225) alloy seamless steel pipes can be used in a wide range of industries, including automotive, mechanical engineering, oil and gas, and construction.
Chemical Composition
| Element | 34CrMo4 (1.7220) | 42CrMo4 (1.7225) |
|---|---|---|
| Carbon (C) | 0.30 – 0.37% | 0.38 – 0.45% |
| Silicon (Si) | 0.40% max | 0.40% max |
| Manganese (Mn) | 0.60 – 0.90% | 0.60 – 0.90% |
| Phosphorus (P) | 0.025% max | 0.025% max |
| Sulfur (S) | 0.035% max | 0.035% max |
| Chromium (Cr) | 0.90 – 1.20% | 0.90 – 1.20% |
| Molybdenum (Mo) | 0.15 – 0.30% | 0.15 – 0.30% |
Mechanical Properties
| Property | 34CrMo4 (1.7220) | 42CrMo4 (1.7225) |
|---|---|---|
| Tensile Strength | 980 – 1180 MPa | 1080 – 1280 MPa |
| Yield Strength | 785 MPa min | 930 MPa min |
| Elongation | 12% min | 12% min |
| Impact Toughness | 35 J min | 35 J min |
| Hardness (HB) | 229 max | 241 max |
Steel Grade
EN 10297-1 34CrMo4 (1.7220) and 42CrMo4 (1.7225) are the steel grades specified in this standard for the alloy seamless steel pipes.
Application
EN 10297-1 34CrMo4 (1.7220) and 42CrMo4 (1.7225) alloy seamless steel pipes find applications in various industries, including:
- Automotive: These pipes are used in the manufacturing of components such as crankshafts, axle shafts, and steering mechanisms.
- Mechanical Engineering: They are utilized in the production of heavy-duty machinery, hydraulic cylinders, and mechanical parts subjected to high stress.
- Oil and Gas: The pipes are suitable for applications in the oil and gas industry, including drilling equipment, pipelines, and offshore structures.
- Construction: EN 10297-1 34CrMo4 (1.7220) and 42CrMo4 (1.7225) alloy seamless steel pipes are used in the construction of bridges, buildings, and other structural components.
Possible Alternative Grades
Some possible alternative grades to EN 10297-1 34CrMo4 (1.7220) and 42CrMo4 (1.7225) alloy seamless steel pipes include ASTM A519 4130, DIN 2391 ST52, and JIS G3445 STKM 13C. These grades offer similar mechanical properties and can be considered as alternatives based on specific requirements and availability.
In conclusion, EN 10297-1 34CrMo4 (1.7220) and 42CrMo4 (1.7225) alloy seamless steel pipes are versatile and high-performance materials suitable for various applications. Their excellent mechanical properties, heat resistance, and weldability make them a preferred choice in industries requiring robust and durable steel pipes.
