S355 Mechanical Structure Tube
S355 Mechanical structure tube is a type of steel pipe formed by punching through round steel, with no welds on the surface. According to the production method, seamless steel pipes are divided into hot-rolled seamless steel pipes, cold-rolled seamless steel pipes, cold-drawn seamless steel pipes, and hot-expanded seamless steel pipes. Seamless steel pipes are classified into two types based on their cross-sectional shape: circular and special-shaped.
The S355 Mechanical structure tube is a high-strength, low-alloy steel that is commonly used in structural and mechanical engineering applications. Known for its excellent balance between strength, toughness, and weldability, S355 tubes are ideal for the construction of large structures, particularly where high load-bearing capacity and durability are critical. This steel grade is manufactured to European standards, specifically to EN 10210 and EN 10219, which specify the dimensions, tolerances, and mechanical properties of tubes made from this steel.
Composition and Properties:
The S355 grade is a type of carbon steel alloy, where the "S" stands for structural steel, and the number "355" represents the minimum yield strength of 355 MPa (megapascals) in a thickness of up to 16 mm. This strength increases with the thickness of the material. S355 steel is low in carbon content, which enhances its toughness and allows it to be easily welded and formed into various shapes, making it ideal for use in mechanical structure tubes.
The chemical composition of S355 steel :
Carbon (C): 0.17% max
Silicon (Si): 0.55% max
Manganese (Mn): 1.60% max
Phosphorus (P): 0.035% max
Sulfur (S): 0.035% max
Nitrogen (N): 0.012% max
Iron (Fe): balance
This combination of elements contributes to its favorable mechanical properties, including tensile strength, yield strength, and elongation.
Applications :
Due to its excellent strength-to-weight ratio and superior mechanical properties, S355 steel tubes are widely used across several industries:
Construction: S355 tubes are commonly used in the construction of buildings, bridges, and other structural works where high load-bearing capacity is required. Their resistance to fatigue and impact makes them ideal for use in large, dynamic structures.
Transportation: The automotive and aerospace industries also use S355 tubes for structural components and vehicle frames. The material’s ability to endure both static and dynamic stresses makes it an excellent choice for chassis, roll cages, and other critical components.
Mechanical Engineering: S355 steel tubes are often used in manufacturing machinery, pipelines, and equipment. Their ability to withstand wear and tear makes them suitable for high-stress environments.
Energy: In the energy sector, S355 tubes are often used in the construction of power plants, wind turbines, and oil and gas pipelines, where structural integrity and resistance to environmental factors like corrosion are vital.
Marine and Offshore: The material's strength and resistance to harsh weather conditions make it ideal for marine and offshore applications, including the construction of platforms, ships, and subsea structures.


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.
Certification:

Packaging and Transportation: