Cold Drawn Cylinder Pipe

This method involves pulling a hollow tube through a die to reduce its diameter and wall thickness, which results in improved mechanical properties and surface finish. These pipes are widely used in various industries due to their high strength, precision, and excellent surface quality.

Cold drawn cylinder pipes are manufactured by pulling a solid cylindrical bar through a die to reduce its diameter and achieve the desired dimensions.

Cold drawn cylinder pipes, also known as cold drawn seamless steel tubes, are manufactured through a cold drawing process. This type of pipe has precise dimensions, high surface finish, and excellent mechanical properties. Cold drawn seamless steel tubes are typically made from high-quality carbon structural steel and, in addition to ensuring chemical composition and mechanical properties, must undergo hydrostatic testing, edge flaring, expansion, and flattening tests to ensure their performance.

Manufacturing Process

The manufacturing process of cold drawn seamless steel tubes includes the following key steps:

• Material Selection: Choosing the right hot-rolled pipes as raw materials, whose material, specifications, and quality directly affect the cold drawing process and the quality of the finished product.
• Heating Treatment: The raw materials need to be heated before cold drawing to improve their plasticity for subsequent cold drawing processing.
• Piercing: The heated billet is pierced to form an initial tube shape.
• Pickling: Removing scale and rust from the surface of the billet to ensure the surface finish of the tube.
• Cold Drawing: The billet is drawn through a cold drawing machine to achieve the desired size and shape. During the cold drawing process, the tube undergoes plastic deformation, resulting in precise dimensions and enhanced mechanical properties.
• Annealing: To eliminate work hardening and internal stresses generated during the cold drawing process, improve the ductility and toughness of the tube, the cold-drawn tube needs to be annealed.
• Straightening: The cold-drawn tube is straightened to ensure straightness.
• Finishing: Including final heat treatment, sampling, cutting heads and tails, inspection (manual inspection and various non-destructive tests), hydrostatic testing, oiling, packaging, and storage.

Material Properties

The chemical composition of cold drawn seamless steel tubes is a key factor in determining their performance. Different grades of steel have different chemical compositions to meet various application requirements.

Quality Control

Quality control is an essential part of ensuring that the product meets industrial standards. This includes checks for surface conditions, such as rust, cracks, dents, and scratches.

Heat Treatment

Heat treatment is an important step in improving the properties of materials. Annealing and normalization are common heat treatment processes for cold drawn seamless steel tubes.

Environmental and Sustainability

Environmental production is an important consideration in the manufacturing process of cold drawn seamless steel tubes. Measures are taken to reduce the environmental impact of production.

Specifications and Dimensions

The specifications of cold drawn seamless steel tubes are defined by their outside diameter (OD) and wall thickness (WT). According to ANSI B36.10 standards, the range of outside diameters for cold drawn seamless steel tubes ranges from 1/8 inch (6 mm) to 42 inches (1067 mm), and the wall thickness varies depending on the schedule.

Properties of Steel Pipe (Not Less Than)

Production Range

• O.D:42mm-760mm
• WT: 4mm-120mm

Standard and Steel Grade

Cold drawn cylinder pipes are manufactured according to various international standards to ensure quality and consistency. Some common standards include ASTM, DIN, EN, and ISO.

• Technical standards related to material: GB/T699, GB/T3077, EN10210, EN10297.
• Applicable technical standards for seamless pipe: GB/T8162, Q/OHAD032 or technical agreement.

Key Features

• High Precision: Cold drawing enhances dimensional accuracy, making these pipes suitable for applications requiring tight tolerances.
• Superior Surface Finish: The process results in a smooth surface finish, reducing the need for further machining.
• Enhanced Mechanical Properties: The cold drawing process improves the tensile strength and hardness of the pipes.
• Versatile Applications: Commonly used in hydraulic cylinders, automotive parts, and machinery manufacturing.

Materials

Cold drawn cylinder pipes can be made from various materials, including carbon steel, alloy steel, stainless steel, and other specialty metals, depending on the application requirements.

Applications

Cold drawn seamless steel tubes are widely used in various fields due to their high precision and superior mechanical properties. They are commonly used in mechanical structures, hydraulic equipment, and automotive components.

• Hydraulic Systems: Used in hydraulic cylinders for construction and industrial machinery.
• Automotive Industry: Applied in manufacturing precision automotive components.
• Machinery Manufacturing: Utilized in producing parts for various types of machinery.
• Aerospace: Employed in the aerospace sector for high-strength and precision components.

Advantages

• Improved Strength: Cold drawing increases the mechanical strength of the pipes.
• Dimensional Accuracy: High precision ensures that pipes meet exact specifications.
• Cost-Effective: Reduces the need for additional machining, saving time and costs.
• Versatile: Suitable for a wide range of industrial applications.