Product description:

Precision seamless pipe is a type of steel pipe formed by punching through round steel, with no welds on the surface. According to the production method, seamless steel pipes are divided into hot-rolled seamless steel pipes, cold-rolled seamless steel pipes, cold-drawn seamless steel pipes, and hot-expanded seamless steel pipes. Seamless steel pipes are classified into two types based on their cross-sectional shape: circular and special-shaped.

A Precision Cold Drawn Seamless Tube is a high-quality steel product designed for applications that require exceptional dimensional accuracy, surface smoothness, and mechanical strength. Manufactured through a cold drawing process without welding, these seamless tubes deliver superior precision, uniformity, and reliability compared to standard welded pipes. They are widely used in the automotive, hydraulic, mechanical, and energy industries where tight tolerances and high performance are essential.

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Manufacturing Process

The production of precision Cold drawn seamless tubes begins with a hot rolled seamless steel tube. This initial tube is carefully cleaned, pickled, and then lubricated before being drawn through a die and mandrel under cold conditions. The cold drawing process refines the tube’s dimensions, improves surface finish, and enhances mechanical properties such as tensile strength and hardness. After drawing, the tubes undergo stress relieving, annealing, straightening, and non-destructive testing to ensure outstanding quality and uniform structure.

This advanced cold working process eliminates internal defects and produces a tube with excellent dimensional accuracy, typically within ±0.05 mm. The inner and outer surfaces achieve a fine finish, often with a roughness value below Ra 1.6 μm, making them ideal for precision assemblies and fluid transmission systems.

Material Grades

Precision cold drawn seamless tubes can be made from a variety of carbon steel and alloy steel grades, such as:

10#, 20#, 35#, 45# carbon steel

ST35, ST37.4, ST45, ST52 (DIN standards)

E235, E255, E355 (EN 10305-1 standard)

A519 1020, 1045, 4130, 4140 alloy steels (ASTM standards)

Each grade offers different combinations of strength, toughness, and machinability, allowing the tube to meet diverse engineering requirements.

Key Features and Advantages

High Dimensional Precision: Extremely tight tolerances for outer diameter, wall thickness, and concentricity.

Smooth Surface Finish: Bright inner and outer surfaces reduce friction and improve flow performance.

Enhanced Mechanical Properties: Increased tensile and yield strength after cold drawing.

Excellent Machinability: Suitable for precision machining, threading, and forming.

No Weld Seam: Ensures uniform strength and eliminates the risk of leakage.

Superior Cleanliness: Ideal for hydraulic and pneumatic systems requiring clean inner surfaces.

Applications:

Applications：

Precision cold drawn seamless tubes are widely used across industries that demand high precision and performance, including:

Automotive Industry: For manufacturing shock absorber tubes, steering columns, and drive shafts.

Hydraulic Systems: As hydraulic cylinder tubes and fluid power components.

Mechanical Engineering: For precision machinery, shafts, and rollers.

Aerospace and Energy: For structural components and high-pressure applications.

Instrumentation and Measurement Equipment: Where high accuracy and reliability are critical.

The application scope of seamless steel pipes is very wide, including structures, fluid transportation, low to medium pressure boilers, high-pressure boilers, fertilizer equipment, petroleum cracking, geological drilling, diamond core drilling, petroleum drilling, ships, automotive half-shaft sleeves, diesel engines, etc. The use of seamless steel pipes will ensure no leakage problems, guarantee the usage effect, and improve material utilization. It can be seen that the application of seamless steel pipes mainly covers three major fields. The first is the construction field, which can be used for underground pipeline transportation, including extracting groundwater during construction. The second is the processing field, which can be used for mechanical processing, bearing sleeves, etc. The third is the electrical field, including gas pipelines and fluid pipelines for hydropower generation.

Company profile:

Since its establishment in 2014, Wuxi Hengxin Zhicheng Co., Ltd. has rapidly grown into a leading enterprise in the steel manufacturing industry. We focus on the research, production and sales of seamless steel pipes, special-shaped steel pipes and hydraulic cylinders, and are committed to providing customers with high-quality, customizable products that fully meet diverse application needs.

Our products are exported to global markets such as the Middle East, South America, Africa, and Southeast Asia, and are highly trusted by large purchasers and customers in the steel industry. We always prioritize quality, reliability and customer service, and attach great importance to establishing long-term and stable cooperative relationships with customers. We provide each customer with tailor-made solutions.

We continuously promote technological innovation and improve service capabilities and production efficiency. Through an efficient online platform, you can browse our best-selling products at any time and communicate with the sales and support teams in real time to conveniently obtain the information you need. We sincerely invite partners from all countries to visit, exchange and provide guidance, and jointly explore more possible cooperation opportunities!

Certification:

Packaging and Transportation:

【Package standard】

We use steel bands to tightly package the products into hexagonal bundles. The structure is stable and not prone to deformation. Each bundle is equipped with two high-strength nylon straps to ensure the safety and convenience of the lifting operation.

To meet various maritime transportation needs, we offer a range of customized packaging options, including full coverage with oilcloth, moisture-proof wooden boxes, and high-strength protective frame packaging, to ensure the maximum safety of goods during transportation.

【Guarantee for transportation】

We offer 20-foot and 40-foot standard container transportation services. Each container can carry up to 25 tons of goods and we can accept trial orders with a minimum of 5 tons. This allows for flexible adaptation to your purchasing scale. All packaging complies with maritime shipping standards to ensure that the goods are delivered to the destination efficiently and safely.

Why us?

We focus on the research, development, production and sales of seamless steel pipes, special-shaped steel pipes and hydraulic cylinders. We have a complete production chain and an advanced equipment system, including piercing machines, cold drawing machines, hot rolling machines, high-precision flaw detection and testing equipment. The company has passed multiple authoritative certifications such as ISO9001, API, SGS, CCS, DNV, ABS, CE, RoHS, etc., ensuring that each product complies with international standards. We are committed to providing customers with high-quality, customizable solutions to meet diverse application needs.

Relying on our own built processing base and modern workshops, combined with multiple branches and storage centers across the country, we have achieved sufficient inventory and efficient logistics coordination, significantly shortening the delivery cycle and ensuring the rapid delivery of orders.

We have established a complete service and support system. After the order is signed, the professional after-sales team can provide timely and safe on-site guidance and technical support to ensure that customers are at ease throughout the process from procurement to use.

FAQ：

1. Do you support customized design and production?

Sure. We have a professional engineering team that can conduct customized design and production with special sizes, control systems or OEM according to your requirements.

2. How fast can you deliver?

In stock sizes, it takes 3-5 days. For customized sizes, it takes 30-35 days.

3. What payment methods do you support?

We support TT payment. Generally, 30% to 50% of the payment is made in advance, and the remaining amount is paid before shipment.

4. Can you provide material certification (MTC)?

Yes, we will provide MTC to you after production is completed to ensure that the material quality meets the standards.

5. What is the minimum order quantity?

Generally, we accept trial orders. The minimum order quantity is 1-3 tons, which can be determined according to different products.