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Standard: DIN 2391 specifies the dimensions, tolerances, and technical delivery conditions for seamless precision steel tubes.
Steel Grades: Common grades include St35, St45, St52, which differ in their carbon and alloy content.
St35: Low carbon content, good weldability.
St45: Higher carbon content, better mechanical properties.
St52: Contains additional alloying elements, higher strength and toughness.
Carbon (C): ≤ 0.22%
Silicon (Si): ≤ 0.55%
Manganese (Mn): 1.60%
Phosphorus (P): ≤ 0.025%
Sulfur (S): ≤ 0.025%
Chromium (Cr): ≤ 0.30%
Nickel (Ni): ≤ 0.30%
Molybdenum (Mo): ≤ 0.08%
Mechanical Properties:
Tensile Strength: Varies with grade; for St52, typically around 600-700 MPa.
Yield Strength: Approximately 520 MPa for St52.
Elongation: Minimum of 14% for St52.
Surface Finish: High-quality surface finish achieved through cold drawing, which enhances aesthetic and functional properties.
Dimensional Accuracy: High precision in dimensions and tolerances due to the cold drawing process.
Cold Drawing: Involves pulling the tube through a die to reduce diameter and wall thickness, improving surface finish and mechanical properties.
Annealing: Often involves annealing to relieve stresses and improve ductility.
Water Cooling Systems: Ideal for use in water cooling pipes due to high precision, excellent thermal conductivity, and resistance to pressure.
Automotive Industry: Used for hydraulic lines, fuel injection lines, and other precision components.
Mechanical Engineering: Suitable for use in machinery where precise and reliable components are required.
Hydraulic and Pneumatic Systems: Widely used in systems requiring high-strength and precise dimensional tubes.
Heat Exchangers: Used in heat exchangers due to good thermal properties and surface finish.
1. High Precision for Optimal Performance
Manufactured with exceptionally tight dimensional tolerances, these tubes ensure perfect compatibility and seamless integration within complex systems. The precision engineering guarantees reliable performance in demanding applications such as hydraulic circuits, precision instrumentation, and high-performance cooling systems, minimizing installation issues and maximizing operational efficiency.
2. Superior Surface Quality for Enhanced Efficiency
Featuring an ultra-smooth internal and external surface finish achieved through advanced cold drawing and polishing processes, these tubes significantly reduce fluid resistance and particulate accumulation. This superior surface quality minimizes pressure drops in fluid systems, improves flow characteristics, and extends component lifespan by reducing abrasive wear.
3. Enhanced Mechanical Properties Through Advanced Processing
The combination of cold drawing and precision annealing processes optimizes the material's microstructure, resulting in improved tensile strength, yield strength, and elongation properties. This controlled manufacturing approach ensures consistent mechanical performance across all production batches, providing reliable performance under varying operational stresses.
4. Exceptional Durability for Demanding Environments
Engineered to withstand extreme mechanical stresses, temperature variations, and challenging environmental conditions, these tubes maintain structural integrity over extended service periods. The robust construction ensures reliable operation in applications ranging from industrial machinery to automotive systems, reducing maintenance requirements and total cost of ownership.
5. Broad Application Versatility
With balanced mechanical properties, excellent thermal conductivity, and corrosion resistance, these tubes adapt to diverse applications including heat exchangers, pneumatic systems, automotive fuel lines, and precision mechanical components. This versatility makes them suitable for both standard industrial uses and specialized technical applications.
6. Quality-Assured Manufacturing
Produced under strict quality control standards with comprehensive testing including dimensional verification, pressure testing, and material certification. Each batch undergoes rigorous inspection to ensure consistent quality and performance reliability for critical applications.
Size Range: Available in various diameters and wall thicknesses to meet different application requirements.
Tolerances: Manufactured with precise tolerances for outer diameter, inner diameter, and wall thickness to ensure consistency and reliability.
Quality Control: Includes various tests such as dimensional inspection, mechanical testing (tensile and hardness tests), and non-destructive testing (e.g., ultrasonic testing) to ensure product quality.
Certification: Supplied with certification according to the relevant standards and customer requirements.
Standard: DIN 2391 specifies the dimensions, tolerances, and technical delivery conditions for seamless precision steel tubes.
Steel Grades: Common grades include St35, St45, St52, which differ in their carbon and alloy content.
St35: Low carbon content, good weldability.
St45: Higher carbon content, better mechanical properties.
St52: Contains additional alloying elements, higher strength and toughness.
Carbon (C): ≤ 0.22%
Silicon (Si): ≤ 0.55%
Manganese (Mn): 1.60%
Phosphorus (P): ≤ 0.025%
Sulfur (S): ≤ 0.025%
Chromium (Cr): ≤ 0.30%
Nickel (Ni): ≤ 0.30%
Molybdenum (Mo): ≤ 0.08%
Mechanical Properties:
Tensile Strength: Varies with grade; for St52, typically around 600-700 MPa.
Yield Strength: Approximately 520 MPa for St52.
Elongation: Minimum of 14% for St52.
Surface Finish: High-quality surface finish achieved through cold drawing, which enhances aesthetic and functional properties.
Dimensional Accuracy: High precision in dimensions and tolerances due to the cold drawing process.
Cold Drawing: Involves pulling the tube through a die to reduce diameter and wall thickness, improving surface finish and mechanical properties.
Annealing: Often involves annealing to relieve stresses and improve ductility.
Water Cooling Systems: Ideal for use in water cooling pipes due to high precision, excellent thermal conductivity, and resistance to pressure.
Automotive Industry: Used for hydraulic lines, fuel injection lines, and other precision components.
Mechanical Engineering: Suitable for use in machinery where precise and reliable components are required.
Hydraulic and Pneumatic Systems: Widely used in systems requiring high-strength and precise dimensional tubes.
Heat Exchangers: Used in heat exchangers due to good thermal properties and surface finish.
1. High Precision for Optimal Performance
Manufactured with exceptionally tight dimensional tolerances, these tubes ensure perfect compatibility and seamless integration within complex systems. The precision engineering guarantees reliable performance in demanding applications such as hydraulic circuits, precision instrumentation, and high-performance cooling systems, minimizing installation issues and maximizing operational efficiency.
2. Superior Surface Quality for Enhanced Efficiency
Featuring an ultra-smooth internal and external surface finish achieved through advanced cold drawing and polishing processes, these tubes significantly reduce fluid resistance and particulate accumulation. This superior surface quality minimizes pressure drops in fluid systems, improves flow characteristics, and extends component lifespan by reducing abrasive wear.
3. Enhanced Mechanical Properties Through Advanced Processing
The combination of cold drawing and precision annealing processes optimizes the material's microstructure, resulting in improved tensile strength, yield strength, and elongation properties. This controlled manufacturing approach ensures consistent mechanical performance across all production batches, providing reliable performance under varying operational stresses.
4. Exceptional Durability for Demanding Environments
Engineered to withstand extreme mechanical stresses, temperature variations, and challenging environmental conditions, these tubes maintain structural integrity over extended service periods. The robust construction ensures reliable operation in applications ranging from industrial machinery to automotive systems, reducing maintenance requirements and total cost of ownership.
5. Broad Application Versatility
With balanced mechanical properties, excellent thermal conductivity, and corrosion resistance, these tubes adapt to diverse applications including heat exchangers, pneumatic systems, automotive fuel lines, and precision mechanical components. This versatility makes them suitable for both standard industrial uses and specialized technical applications.
6. Quality-Assured Manufacturing
Produced under strict quality control standards with comprehensive testing including dimensional verification, pressure testing, and material certification. Each batch undergoes rigorous inspection to ensure consistent quality and performance reliability for critical applications.
Size Range: Available in various diameters and wall thicknesses to meet different application requirements.
Tolerances: Manufactured with precise tolerances for outer diameter, inner diameter, and wall thickness to ensure consistency and reliability.
Quality Control: Includes various tests such as dimensional inspection, mechanical testing (tensile and hardness tests), and non-destructive testing (e.g., ultrasonic testing) to ensure product quality.
Certification: Supplied with certification according to the relevant standards and customer requirements.
