Product description:

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.

Seamless square and rectangular tubes are precision-engineered hollow sections designed for high-strength structural and mechanical applications. Unlike welded tubes, seamless tubes are manufactured without any welding joints, ensuring superior uniformity, pressure resistance, and durability. These tubes are made from high-quality carbon steel, alloy steel, or stainless steel, and are widely used in construction, machinery, automotive, shipbuilding, energy, and hydraulic systems.

Seamless hollow sections combine the structural efficiency of square and rectangular shapes with the reliability of seamless technology, providing an excellent strength-to-weight ratio and consistent performance under demanding conditions.

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Manufacturing Process

The production of seamless Square and rectangular tubes begins with a seamless round steel billet. The process includes:

Piercing: The solid billet is heated and pierced to form a hollow shell.

Elongation: The hollow shell is rolled and elongated using a mandrel mill or stretch reducer to achieve precise dimensions.

Shaping: The round tube is then cold-drawn or hot-formed into square or rectangular shapes using advanced forming technology.

Heat Treatment: Tubes are normalized, annealed, or quenched and tempered to achieve the desired mechanical properties.

Finishing and Inspection: Each tube undergoes strict non-destructive testing (NDT) such as ultrasonic, eddy current, or hydrostatic testing to guarantee internal and external soundness.

This seamless process ensures excellent dimensional accuracy, smooth inner and outer surfaces, and consistent performance across the entire length of the tube.

Material Grades

Common steel grades for seamless square and rectangular tubes include:

Carbon Steel: ASTM A106, A53, A519, ST35, ST52, S355, S235

Alloy Steel: 4130, 4140, 20MnV6, 15CrMo, 12Cr1MoV

Stainless Steel: 304, 316L, 321, 310S

Each grade offers specific advantages in terms of tensile strength, corrosion resistance, and heat tolerance, allowing users to select the best material for their project requirements.

Advantages of Seamless Square and Rectangular Tubes

No Weld Seams: Provides uniform strength along the entire tube length.

High Pressure Resistance: Suitable for hydraulic systems, oil and gas applications, and high-pressure pipelines.

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

Superior Dimensional Accuracy: Ideal for precision engineering and mechanical fabrication.

Better Mechanical Performance: Enhanced strength, toughness, and fatigue resistance compared to welded tubes.

Versatile Forming Options: Easily machined, drilled, or cut to custom lengths.

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Applications:

Seamless square and rectangular tubes are used across multiple industries due to their versatility and performance:

Construction and Structural Engineering: Building frames, bridges, and load-bearing columns.

Machinery Manufacturing: Equipment supports, hydraulic cylinders, and precision machine parts.

Automotive and Transportation: Vehicle chassis, frames, and roll cages.

Energy Sector: Oil and gas pipelines, boiler tubes, and heat exchangers.

Shipbuilding and Offshore: Marine structures, cranes, and offshore platforms.

Furniture and Decoration: Industrial furniture, modular systems, and architectural elements.

These applications highlight the adaptability and reliability of seamless tubes in both heavy-duty and aesthetic projects.

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!

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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.