EN 10305 Cold Drawn Precision Seamless Steel Pipe

Product Introduction

EN 10305 cold drawn precision seamless steel pipes are designed for applications requiring high dimensional accuracy and superior surface finish. These pipes are produced through a cold drawing process, resulting in tight tolerances and a smooth, clean inner and outer surface. They are commonly used in hydraulic systems, automotive components, and mechanical engineering.

Characteristics of EN 10305 Precision Seamless Steel Pipe

High Dimensional Accuracy: Tight tolerances ensure precise dimensions.
Superior Surface Finish: Smooth inner and outer surfaces reduce friction and wear.
Enhanced Mechanical Properties: Improved strength and toughness due to the cold drawing process.
High Cleanliness: Low contamination levels make them suitable for hydraulic and pneumatic systems.
Good Weldability: Can be easily welded and fabricated.

Material Grades

EN 10305 covers several material grades, including:

E235: General engineering applications.
E355: Higher strength and better mechanical properties.
C45E: High carbon content suitable for specialized applications.

Chemical Composition (%)

Element	E235	E355	C45E
C	≤ 0.17	≤ 0.22	0.42 – 0.50
Si	≤ 0.35	≤ 0.55	≤ 0.40
Mn	≤ 1.20	≤ 1.60	0.50 – 0.80
P	≤ 0.025	≤ 0.025	≤ 0.025
S	≤ 0.025	≤ 0.025	≤ 0.025
Cr	–	–	≤ 0.40
Mo	–	–	≤ 0.10
Ni	–	–	≤ 0.40

Mechanical Properties

Property	E235	E355	C45E
Tensile Strength	340 – 480 MPa	490 – 630 MPa	590 – 740 MPa
Yield Strength	≥ 235 MPa	≥ 355 MPa	≥ 290 MPa
Elongation	≥ 25%	≥ 22%	≥ 10%
Hardness	≤ 90 HB	≤ 120 HB	179 – 229 HB

Manufacturing Process

Tube Formation: The initial tube is produced by hot rolling.
Cold Drawing: The hot-rolled tube is cold drawn to achieve precise dimensions and surface finish.
Heat Treatment: The drawn tube may undergo annealing or normalization to enhance its mechanical properties.
Finishing: Further processing such as straightening, cutting, and deburring.
Inspection and Testing: Ensures compliance with specified standards.

Applications

Hydraulic and Pneumatic Systems: Used in cylinders and actuators requiring high precision.
Automotive Industry: Ideal for shock absorbers, steering systems, and drive shafts.
Mechanical Engineering: Suitable for machine parts and tools requiring high accuracy.
Construction: Used in structural applications where precision is critical.

Inspection and Testing

To ensure the quality and performance of EN 10305 cold drawn precision seamless steel pipes, the following inspection and testing procedures are implemented:

Visual Inspection: Examination of the pipe for any visible defects or irregularities.
Dimensional Inspection: Verification of pipe dimensions, including outer diameter, wall thickness, and length, to ensure compliance with specified tolerances.
Non-Destructive Testing (NDT):
- Ultrasonic Testing (UT): Detects internal defects such as cracks and inclusions.
- Eddy Current Testing (ECT): Identifies surface and near-surface defects.
Mechanical Testing:
- Tensile Test: Measures tensile strength, yield strength, and elongation.
- Hardness Test: Determines the hardness value to ensure the material meets specified requirements.
Surface Roughness Measurement: Ensures the surface finish meets the required standards.

Packaging and Delivery

Proper packaging and handling of EN 10305 cold drawn precision seamless steel pipes are crucial to prevent damage during transportation and storage:

Packaging:
- Pipes are typically bundled and secured with steel strips.
- Ends are capped to prevent contamination.
- Protective measures are taken to avoid damage during handling and transportation.

Marking:
- Each pipe is marked with relevant details such as grade, size, heat number, and manufacturer’s name.
Documentation:
- Comprehensive documentation accompanies the shipment, including inspection and testing certificates, material test reports (MTR), and compliance certificates.

EN 10305 cold drawn precision seamless steel pipes are essential for applications requiring high dimensional accuracy, superior surface finish, and excellent mechanical properties. Their versatility makes them suitable for use in hydraulic systems, automotive components, and various mechanical engineering applications. The cold drawing process enhances their mechanical properties, making them robust and reliable for demanding conditions.

For detailed specifications, technical support, or to place an order, please contact the manufacturer or refer to the relevant industry standards.