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Due to Q355B outstanding mechanical properties, excellent weldability, and cost-effectiveness, Q355B has become widely used in construction, bridge engineering, car manufacturing, and several structural applications. With the continued upgrading of China’s manufacturing enterprise and infrastructure development, Q355B has grow to be a best alternative for traditional grades such as Q235 and Q345.

Global crude steel production for the 70 reporting countries reached 141.8 million tonnes in September 2025, representing a yearonyear decline of 1.6%.

Drawing on extensive technological expertise, Tianjin Yuantai Derun Group has perfected sophisticated cold forming processes, allowing for the bespoke fabrication of uniquely shaped structural steel tubing. Whether square, rectangular, oval, or intricate polygonal forms, Yuantai Derun can adjust tube measurements, wall density, and structural characteristics to suit a wide array of engineering requirements. This adaptable customization capacity represents a significant advancement in the company

In steel terminology, ”gauge ”is commonly used for sheet metal to describe the thickness or thickness range of material.

Understanding the limitations of zinc coating and surface treatment for steel products protection.

square and rectangular tubes are versatile, used in building steel structures, machinery, bridge supports, transit, greenhouses, auto manufacturing, and custom equipment frames, meeting diverse needs.

Strength refers to a welded square tube's ability to resist damage (plastic deformation or breakage) under static load, including stretching, tightening, winding, shearing, and other forms of stress.

Square tubes can be welded using a variety of methods: manual metal arc welding, gas shielded welding, submerged arc welding, argon tungsten arc welding, and plasma arc welding.

Premium galvanized square tubes with durable zinc coating for superior corrosion resistance. Ideal for construction, fencing & industrial use. Strong, long-lasting, ready to ship!

Yuantai Derun is a professional steel pipe manufacturer, mainly producing square pipes, galvanized pipes, LSAW, ERW, spiral pipes, seamless pipes.

Galvanised steel is a perfect choice for applications where steel parts are exposed to atmospheric corrosion.

Yuantai mainly produces square and rectangular pipes, galvanized pipes, spiral pipes, seamless pipes, LSAW, ERW steel pipes, etc

Galvanized square pipe is a galvanized pipe, which has two types: hot-dip galvanized square pipe and cold-dip galvanized square pipe.

Galvanizing is an economical and effective anti-corrosion method that is often used. Galvanized sheet refers to a steel sheet with a layer of zinc on the surface