S235JR(E235B)Square Steel Pipe
Product description:

The S235JR (E235B) square steel pipe is a widely used low-carbon structural steel tube designed for general engineering, construction, and mechanical applications. Belonging to the EN 10025 and EN 10210 standards, this material is known for its excellent weldability, high plasticity, and good impact toughness. Its balance of strength, ductility, and cost-effectiveness makes it one of the most common structural steel grades in Europe and globally.

With a square cross-section and uniform wall thickness, S235JR square pipes are ideal for load-bearing structures, mechanical supports, and precision fabrication. They are available in both hot-finished and cold-formed conditions, offering flexibility for various industrial applications, including construction, automotive, machinery, and steel frameworks.

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 (EN 10025-2): A non-alloy structural steel with a minimum yield strength of 235 MPa and impact energy of 27 J at +20°C (JR designation). It provides reliable performance under normal ambient conditions.
• E235B (EN 10210 / EN 10305-3): A carbon-manganese steel with excellent machinability, formability, and weldability, suitable for mechanical and hydraulic structures that require dimensional precision.
• Both grades are often used interchangeably for low- and medium-load structural applications, offering a strong balance between strength, flexibility, and economy.

Manufacturing Process

• The E235B square steel pipe is produced using advanced steelmaking and forming technologies to guarantee precision and strength:
• Steelmaking: Refined molten steel is continuously cast into billets.
• Forming: Pipes are formed by hot rolling, cold drawing, or electric resistance welding (ERW).
• Sizing: Pipes are shaped into a square profile with precise dimensional control.
• Heat Treatment: Normalizing or annealing improves internal uniformity and mechanical stability.
• Surface Finishing: Pipes can be black, pickled, galvanized, or coated for corrosion protection.
• Inspection: Each pipe undergoes strict dimensional, mechanical, and non-destructive testing.

Key Features and Advantages

• Excellent Weldability: Compatible with all conventional welding methods.
• Good Formability: Easy to bend, cut, and shape for construction and fabrication.
• Reliable Strength: Yield strength ≥235 MPa, suitable for general structural applications.
• High Dimensional Accuracy: Consistent wall thickness and square geometry.
• Corrosion Protection: Optional galvanizing or painting extends service life.
• Economic Material Choice: Cost-efficient solution for medium-strength requirements.
• Sustainable and Recyclable: Environmentally friendly steel with long service life.

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Applications:

The S235JR (E235B) square steel pipe is widely used across industries due to its versatility and affordability. Major applications include:

• Construction and Civil Engineering: Columns, beams, building frames, guardrails, and scaffolding.
• Mechanical Engineering: Equipment supports, brackets, and fabricated structures.
• Automotive and Transport: Trailer frames, truck bodies, and chassis reinforcements.
• Furniture and Architecture: Metal furniture, modern handrails, and decorative frames.
• Agriculture and Machinery: Frameworks for agricultural tools and lightweight machines.
• Renewable Energy Structures: Wind tower frames and solar panel supports.
• Its strength, formability, and availability make it a go-to option for engineers and fabricators worldwide.

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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.