Quality Straight Seam Welded Steel Pipe

Hot Dip Galvanized Oval Steel Pipe is a durable welded steel tube featuring an oval cross-section and corrosion-resistant zinc coating. Manufactured from carbon steel with precision forming and hot dip galvanizing technology, it provides strong structural performance, lightweight construction, and an attractive appearance for agricultural, architectural, furniture, and industrial applications.

ZHONGTIAN Small Diameter Hot Dip Galvanized Oval Steel Pipe is a lightweight and corrosion-resistant steel tube designed for compact structures, outdoor applications, and decorative projects. Manufactured through cold forming, welding, and hot dip galvanizing processes, it offers excellent durability, stable performance, and flexible customization options for various industries.

ZHONGTIAN Large Diameter Black Rectangular and Square Steel Tube is a heavy-duty hollow steel profile, typically defined as a large-section tube with a side length ≥ 100mm. It is manufactured using Q235B or Q355B carbon steel through high-frequency welding, submerged arc welding, or seamless forming processes. The product boasts core advantages such as large cross-section, high load-bearing capacity, and excellent bending and deformation resistance. The surface is a natural black oxide scale, without galvanizing or painting, providing a cost-effective structural support solution for heavy steel structures, industrial buildings, and large-scale infrastructure.

ZHONGTIAN Thin Wall Black Rectangular and Square Steel Tube is a lightweight hollow profile made from carbon steel strip through high-frequency welding. The surface has a natural black oxide scale, without galvanizing or coating treatment, making it a cost-effective solution for light-load structures. The material is typically Q235B, which is lightweight, easy to cut, easy to weld, easy to bend, and convenient for secondary processing. It is widely used in light-duty frames and decorative structures where load-bearing requirements are not high.

ZHONGTIAN Thick Wall Black Rectangular and Square Steel Tube is a hollow carbon steel profile manufactured using high-frequency welding or seamless forming processes, typically with a wall thickness exceeding 4mm. Its core advantages lie in its high load-bearing capacity, excellent bending resistance, and good machinability. The product surface is covered with a natural black oxide scale, without any additional coating, providing customers with a cost-effective basic structural material, particularly suitable for heavy-duty engineering projects requiring secondary surface treatment.

Black Rectangular and Square Steel Tube is an uncoated carbon steel hollow section produced through cold forming and high-frequency welding. With a square or rectangular profile, it provides excellent bending strength, torsional resistance, and fabrication flexibility. Unlike galvanized steel tube, it has no protective zinc coating, making it suitable for indoor structures, machinery frames, temporary constructions, and projects requiring further painting or galvanizing after fabrication. As a professional steel tube manufacturer and supplier in China, we provide customized sizes, steel grades, and processing services for construction, industrial equipment, and infrastructure applications worldwide.