Overview
Welded rectangular and square tubing are hollow structural sections (HSS) formed by rolling and welding flat metal sheets. They are favored in industrial and commercial applications for their uniform geometry, which simplifies assembly and enhances structural integrity. Available in standardized sizes (e.g., 20×20mm to 400×400mm), these tubes are classified by wall thickness (light, medium, heavy gauge) and surface finish (galvanized, painted, or raw). Their modular design supports cost-effective mass production and customization.
Structure and Working Principle
Rectangular/square tubes derive strength from their geometric shape, which distributes load evenly across edges. The welding process (typically ERW or HFIW) ensures seam integrity, while post-weld treatments (e.g., annealing) relieve stress. Key structural metrics include moment of inertia and section modulus, which determine bending resistance. Engineers select dimensions based on span and load requirements—thicker walls for heavy loads, larger cross-sections for longer spans.
Key Features
1. **Material versatility**: Carbon steel tubes (ASTM A500) are economical for general use; stainless steel (304/316) resists corrosion; aluminum (6061/6063) offers lightweight durability. 2. **Fabrication-friendly**: Easily cut, drilled, or welded onsite. Pre-punched or slotted variants save labor in assembly. Powder coating enhances aesthetics and protection.
Application Areas
1. **Construction**: Building frames, handrails, and roofing supports where rigidity is critical. 2. **Industrial**: Conveyor systems, machine guards, and storage racks. Square tubes are common in modular workstations due to their stackability. 3. **Transportation**: Trailers and vehicle chassis benefit from the weight savings of aluminum tubing.
Maintenance and Precautions
Regular inspections for cracks or rust (in non-stainless variants) are essential. Galvanized coatings extend lifespan in outdoor applications. Avoid point loading on thin-walled tubes. Storage should keep tubes dry and stacked flat to prevent warping. Cutting debris must be cleared to avoid compromising weld quality during modifications.
B2B Procurement Guide
1. **Specifications**: Confirm standards (e.g., ASTM, EN) and tolerances (±0.5mm for precision projects). 2. **MOQs**: Bulk orders (5+ tons) often reduce unit costs. Some suppliers offer mill-direct pricing for 20+ ton shipments. 3. **Logistics**: Tube length (typically 6m) affects shipping costs—consider local fabricators for large-volume needs.
Related Manufacturers
- 主营：无缝管、不锈钢管、不锈钢焊管、不锈钢焊接管、铝管、不锈钢板 折弯焊接加、铝板、铝棒
- 主营：不锈钢酒柜、不锈钢屏风、不锈钢背景柜、焊接加工、激光切管、钣金加工、不锈钢制品、不锈钢加工、不锈钢储罐、不锈钢料仓、不锈钢机架、激光切割加工、不锈钢板加工
- 主营：不锈钢储罐定制加工、不锈钢加工料仓、激光加工板、压花板/防滑板、不锈钢加工卷圆焊接、三维激光切割管材、钣金制品、不锈钢搅拌罐、不锈钢板材批发、不锈钢花箱、310S耐高温马弗炉胆、不锈钢线性水沟、钢结构旋转楼梯、不锈钢T型条装饰、不锈钢沉淀池、不锈钢制品加工、不锈钢冲孔网定制、不锈钢栏杆、不锈钢喷淋塔、不锈钢中厚板
- 主营：工字钢、角钢、槽钢、无缝钢管、H型钢、钢板、圆钢
- 主营：16mn方管、镀锌方管、无缝方管、大口径黑方管、冷拔方管、镀锌带方管、直角方管、船用方管、Q195B方管、Q235B方管、Q345B方管、幕墙方管、小口径方管
- 主营：等边及不等边角钢、槽钢、工字钢、焊管及特殊尺寸、热镀锌加工、镀锌角钢、镀锌槽钢、镀锌扁钢、镀锌圆钢、热轧开平板、低温开平钢板、普碳开平板、热轧开平钢板、耐低温开平板、合金开平板、开平钢板、高强合金开平板、国标材质开平板、加厚开平板、低合金开平板、低温低合金开平板、耐压开平板、高强开平板、国标热轧H型钢、供应等边角钢
- 主营：无缝方管、直角方矩管、方管、圆管、方矩管、q345b方管、q355b方管、q355d方管、q355e方管、q460c方管、Q700l方管、q235b方管、20#无缝方管、16Mn无缝方管、spcc光亮圆管、spcc光亮方管、大口径厚壁方管、大口径薄壁方管、recc方管、q1500方管、q690方管
- 主营：304不锈钢管、不锈钢焊管、不锈钢工业管、304不锈钢焊管、304工业管、不锈钢水管厂家、不锈钢薄壁水管、不锈钢管、流体管、304不锈钢圆管、304/316不锈钢、不锈钢卫生管、不锈钢矩形管、304不锈钢方管、不锈钢管厂、建设用方矩管、家具制品用管、工业抛光流体管、卫生流体管、工业焊管、不锈钢换热器管、304直缝钢管、镜面拉丝管、食品卫生管304、双兴卫生级
- 主营：镀铝镁锌管、矩形管、镀锌管、八角管、椭圆管、冷弯型钢
- 主营：不锈钢板、不锈钢角钢、不锈钢工字钢、不锈钢装饰管、不锈钢焊管、不锈钢工业管、不锈钢槽钢、不锈钢卷、不锈钢天沟、不锈钢排水槽
- 主营：镀锌角钢、镀锌槽钢、镀锌工字钢、无缝管、合金钢管、厚壁钢管、无缝钢管、大口径钢管、镀锌钢管、镀锌椭圆管、热镀锌钢管、美标无缝管、高压无缝管、双相不锈钢管、镀锌H型钢、容器板、等边角钢、镀锌钢板、热轧板、低温板、中厚板、合金钢板、高强板、船板、桥梁板
- 主营：不锈钢无缝管、不锈钢焊管、不锈钢换热管、脱脂不锈钢管、流体不锈钢管、不锈钢卫生管、精密不锈钢管、卡套不锈钢管、电解不锈钢管、BA不锈钢管、304不锈钢管、316L不锈钢管、2205不锈钢管、310S不锈钢管、低温不锈钢管、高压不锈钢管、中低压不锈钢管、薄壁不锈钢管、厚壁不锈钢管、不锈钢工业管、食品卫生级不锈钢管、酸洗不锈钢管、不锈钢水管、不锈钢盘管、321不锈钢管
- 主营：钢板、合金板、中厚板、无缝管、锅炉管、无缝钢管、镀锌管、合金钢管、方管、镀锌方管、输送管道、美标钢管、S355JR无缝钢管、Q355E方管、热镀锌钢管、Q235B镀锌钢管、高压合金钢管、角钢、槽钢、工字钢、花纹板、Q355C角钢、中低压锅炉、15CrMoG无缝钢、20CrMo圆钢
- 主营：不锈钢板、不锈钢角钢、不锈钢槽钢、不锈钢管、不锈钢厚壁管、不锈钢装饰管、不锈钢扁钢、不锈钢工字钢、不锈钢圆钢、花纹板、不锈钢卷
- 主营：不锈钢、不锈钢板、水槽、不锈钢管、天沟、不锈钢水槽、不锈钢装饰板、激光切割加工、钣金加工、排水沟盖板、缝隙式排水沟、地沟盖板、拉丝不锈钢、格栅板、不锈钢加工、镀钛不锈钢、镜面不锈钢、色板、蚀刻不锈钢、波纹板、乱纹不锈钢、镀铜不锈钢、屏风、井盖、不锈钢收边条