S355J0(E355C) Square Steel Pipe
Product description:

The S355J0 (E355C) square steel pipe is a high-performance structural steel tube designed for applications requiring superior strength, excellent toughness, and reliable weldability. It is part of the EN 10025 and EN 10210 series of European structural steels, commonly used in construction, mechanical engineering, transportation equipment, and general manufacturing.

With its square cross-section, the E355C steel pipe offers exceptional bending resistance, load-bearing capacity, and geometric stability. It provides an ideal solution for engineers and designers seeking both mechanical efficiency and dimensional precision in modern steel structures.

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

S355J0 (EN 10025-2) is a non-alloy structural steel with a minimum yield strength of 355 MPa and guaranteed impact toughness at 0°C (hence the “J0” designation). It provides high strength and resilience for load-bearing structures in moderate climates.

E355C (EN 10305-3 / EN 10210) is a precision structural steel known for consistent mechanical performance, excellent machinability, and a clean internal surface suitable for hydraulic and mechanical systems.

Both grades share similar mechanical properties and can be used interchangeably for structural and mechanical applications where strength, formability, and reliability are required.

Manufacturing Process

S355J0 (E355C) square steel pipes are produced through hot-finished or cold-formed techniques, depending on dimensional accuracy and surface quality requirements:

• Billet Preparation: Selected high-quality steel billets are heated and descaled.
• Forming: Pipes are shaped via hot rolling, cold drawing, or ERW (electric resistance welding).
• Cold Finishing: Achieves precise dimensional control and smooth internal surfaces.
• Heat Treatment: Normalizing or annealing enhances mechanical consistency and removes internal stress.
• Surface Treatment: Black oxide, pickled, galvanized, or coated finishes improve corrosion resistance.
• Quality Testing: Conducted at every stage to ensure dimensional precision and material integrity.

Key Features and Advantages

• High Yield and Tensile Strength: Ensures durability under heavy mechanical loads.
• Guaranteed Impact Resistance at 0°C: Reliable performance in moderate cold conditions.
• Excellent Weldability: Suitable for all standard welding methods without preheating.
• Superior Dimensional Accuracy: Ideal for precision fabrication and assembly.
• Enhanced Corrosion Resistance: Available with galvanizing or coating protection.
• Versatile Design Options: Easily cut, bent, drilled, and machined.
• Smooth Internal Surface: Perfect for hydraulic, pneumatic, and fluid systems.

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Applications:

The S355J0 square steel pipe is used in a wide range of fields requiring structural strength, precision, and durability:

• Construction & Structural Engineering: Building frames, support columns, bridges, and trusses.
• Machinery Manufacturing: Machine bases, conveyors, cranes, and mechanical supports.
• Automotive & Transportation: Vehicle frames, trailers, and structural reinforcements.
• Energy & Hydraulic Systems: Oil cylinders, pressure vessels, and mechanical pipelines.
• Furniture & Architectural Design: Modern frames, railings, and decorative metalwork.
• Shipbuilding & Offshore Equipment: Marine structures requiring corrosion and impact resistance.
• Its combination of high mechanical performance and fabrication flexibility makes it a trusted choice across multiple industries.

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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.