S235JR(E235D) Square Steel Pipe
Product description:

E235D square steel pipe is a high-quality structural steel product widely used in construction, machinery manufacturing, automotive engineering, and general fabrication industries. Manufactured according to EN 10210 and EN 10219 European standards, this grade combines excellent mechanical properties, good weldability, and consistent performance under various working conditions. It is a cost-effective solution for structural frameworks requiring moderate strength and high formability.

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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Material Overview

S235JR is a non-alloy structural steel grade with a minimum yield strength of 235 MPa, representing the “JR” impact test designation at 20°C. Its equivalent grade, E235D, follows the EN 10305 standard for Precision steel tubes used in mechanical and hydraulic applications. The combination of these properties makes S235JR (E235D) square pipes suitable for both structural and mechanical engineering purposes.

The steel is typically produced by hot-rolled or cold-formed processes, followed by precise shaping into square sections. Surface treatment options include black, galvanized, oiled, or pickled finishes, depending on the intended use and corrosion protection requirements.

Manufacturing and Processing

S235JR (E235D) square steel pipes are typically produced through high-precision forming and welding technologies, ensuring uniform wall thickness, smooth surface finish, and dimensional accuracy. After forming, pipes can be normalized or stress-relieved to enhance mechanical performance. Advanced inspection methods like ultrasonic testing, eddy current, and hydrostatic testing are used to ensure product quality.

Advantages

Excellent Weldability: The low carbon content ensures easy welding by all conventional methods without preheating.

High Dimensional Accuracy: Suitable for precision structures and mechanical fabrication.

Cost-Effective Strength: Provides an optimal balance between strength and weight.

Versatile Surface Treatments: Can be supplied hot-dip galvanized, painted, or with anti-corrosion coatings.

Good Formability and Machinability: Easily shaped and fabricated into frames, supports, and mechanical parts.

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Applications:

S235JR square steel pipes are used in a wide range of industries:

Construction: Steel structures, building frames, scaffolding, and support columns.

• Machinery: Equipment frames, mechanical supports, and precision machine components.
• Automotive: Chassis, brackets, and load-bearing parts.
• Transportation: Trailers, containers, and railway structures.
• Furniture and Decoration: Industrial furniture, guardrails, and modular systems.
• Its adaptability makes it a preferred material for both indoor and outdoor applications.

Surface Finishing & Coating Options

• Black (Hot-rolled) – for general structural use.
• Pickled and Oiled – provides temporary corrosion resistance.
• Hot-dip Galvanized – ideal for outdoor and marine environments.
• Powder Coated or Painted – for decorative or protective purposes.

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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.