Cold-Drawn Square And Rectangular Tubes
Product description:

Cold-drawn square and rectangular tubes are high-precision steel products manufactured through a cold drawing process to achieve excellent dimensional accuracy, smooth surface finish, and enhanced mechanical properties. These tubes are commonly used in mechanical structures, automotive systems, construction frameworks, hydraulic machinery, and precision instruments. The cold-drawing technique refines the internal grain structure of the steel, improving its strength, toughness, and surface quality compared to hot-rolled or welded alternatives.
Square and rectangular sectioned steel pipes are collectively referred to as square and rectangular sectioned steel pipes, and they belong to a type of welded steel pipes. They are also known as "steel cold-formed sections".

Due to their unique cross-sectional shape and excellent mechanical properties, square and rectangular sectioned steel pipes are widely used in modern industries, construction and manufacturing, and have become an indispensable basic steel material.

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Manufacturing Process

The production of cold-drawn Square and rectangular tubes begins with a seamless or welded round tube as the base material. The process typically includes the following stages:

• Preparation: The round tube is cleaned, pickled, and lubricated to reduce surface oxidation and friction during drawing.
• Cold Drawing: Using high-precision dies and mandrels, the tube is drawn through a shaping process at room temperature to form a square or rectangular cross-section.
• Heat Treatment: After drawing, the tube undergoes annealing or normalization to relieve internal stress and restore ductility.
• Finishing: Tubes are straightened, cut to length, and surface-treated (oiled, polished, or coated) to ensure durability and corrosion resistance.
• Inspection: Each tube is tested for dimensional tolerance, surface smoothness, and mechanical integrity using advanced non-destructive testing (NDT) methods such as ultrasonic or eddy current inspection.
• This meticulous process results in a product that meets the highest standards of dimensional precision and mechanical reliability.

Material Grades

Cold-drawn square and rectangular tubes are produced from a variety of steel grades depending on the application requirements:

• Carbon Steel: ST35, ST37.4, ST52, S235JR, S355J2, E235, E355
• Alloy Steel: 20MnV6, 15CrMo, 42CrMo4, 4130, 4140
• Stainless Steel: 304, 316L, 321, 310S
• These grades offer combinations of tensile strength, corrosion resistance, and formability suitable for both industrial and decorative applications.

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Applications:

Cold-drawn square and rectangular tubes are widely used in various industries due to their strength, precision, and surface quality:

• Mechanical Engineering: Shafts, machine frames, and precision components.
• Automotive and Transportation: Axles, steering columns, and chassis frames.
• Construction and Architecture: Structural frameworks, building supports, and decorative elements.
• Hydraulic and Pneumatic Systems: Cylinders, actuators, and fluid lines requiring smooth surfaces.
• Furniture and Equipment: Modern metal furniture, racks, and display systems.
• Their combination of strength, precision, and aesthetic appeal makes them a preferred material for high-performance designs.

Quality Standards and Certifications

Cold-drawn square and rectangular tubes meet or exceed international standards, including:

• EN 10305-5 / EN 10305-1 – Precision steel tubes
• DIN 2391 / DIN 2395 – Cold-drawn seamless and welded tubes
• ASTM A513 / A519 – Mechanical and structural tubing
• GB/T 3639 / GB/T 3094 – Precision Cold-Drawn Steel Tubes
• ISO 9001 / CE / SGS – Quality management and safety certifications

These standards ensure product consistency, strength, and compliance with global engineering requirements.

Company profile:

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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.

Wuxi Hengxin Zhicheng International Trade Co., Ltd. is a professional supplier and stockist specializing in seamless steel pipes and precision steel tubes. With years of experience in the steel industry, we are committed to providing high-quality steel pipe products and customized solutions to meet the diverse needs of customers in machinery manufacturing, hydraulic systems, petrochemical, boiler, construction, and energy industries.
We maintain a long-term and stable inventory of various steel pipe products and have established strategic partnerships with well-known domestic steel mills. Relying on advanced production technology, strict quality control, and excellent logistics services, we ensure timely delivery and consistent quality for every order.
Main Products
Seamless Steel Pipe
Precision Steel Tube
Honed Tube
Hydraulic Cylinder Tube
Special-shaped Tube
High-pressure Boiler Tube
Medium & Low-pressure Boiler Tube
Fertilizer Tube
Petroleum Cracking Tube
Fluid Pipe
Structural Pipe
All products are manufactured in accordance with international standards such as ASTM, DIN, EN, GB, and JIS, ensuring excellent performance, dimensional accuracy, and long service life.