Product Overview
Square and Rectangular Steel Pipes are divided into black steel pipe and galvanized steel pipe types, adopting high-frequency welding and cold forming technology. Black square/rectangular pipes feature original hot-rolled black oxide surface without anti-corrosion treatment, with high structural strength and excellent weldability. Galvanized square/rectangular pipes are processed with hot-dip galvanizing technology on the basis of black pipes, forming a dense zinc-iron alloy layer on the surface. Both products have uniform wall thickness, stable dimensional accuracy and strong structura
l stability, widely applicable in building structures, engineering construction, decoration and mechanical manufacturing fields.
Key Features
Stable Structural Performance: Integral cold-formed structure, high rigidity, not easy to deform, excellent load-bearing and shock resistance, suitable for various structural support scenarios.
Uniform Wall Thickness & High Accuracy: Precise rolling and straightening process, wall thickness error controlled within ±0.2mm, neat pipe section, consistent dimensional standard.
Excellent Processing Performance: Good weldability, cutting, bending and punching performance, easy for secondary processing and on-site construction.
Superior Anti-corrosion Ability (Galvanized Type): Thick and uniform zinc coating (over 45μm), tight combination with steel base, effectively isolating air and moisture, long service life in outdoor and humid environments.
Cost-Effective (Black Type): No surface galvanizing treatment, low comprehensive cost, high cost performance, ideal for indoor structural engineering with low anti-corrosion requirements.
Flexible Customization: Support customized side length, wall thickness, length and surface treatment (painting, spraying, galvanizing) to meet diverse project demands.
Mechanical Properties
High structural strength and strong load-bearing capacity
Stable mechanical properties, not easy to deform under pressure
Good welding and machining performance
High dimensional accuracy and flat pipe surface
Excellent weather resistance and anti-corrosion performance (galvanized pipe)
Reliable and stable overall performance for long-term engineering use
Production Process
Black Square/Rectangular Pipe: Steel strip slitting → Cold bending forming → High-frequency welding → Seam trimming → Cooling → Straightening → Size inspection → Finished product
Galvanized Square/Rectangular Pipe: Qualified black pipe → Surface degreasing and rust removal → Hot-dip galvanizing → Zinc layer leveling → Cooling → Passivation treatment → Inspection → Finished product
The standardized production process ensures consistent weld quality, uniform pipe structure, stable size and reliable overall performance of the products.
Applications
Black Square/Rectangular Steel Pipe:
Indoor steel structure frames, factory building supports, equipment brackets, elevator frames, mechanical manufacturing parts, indoor decoration keels, temporary construction supports and other indoor low-corrosion-demand scenarios.
Galvanized Square/Rectangular Steel Pipe:
Building curtain wall structures, outdoor engineering supports, greenhouse frames, guardrail engineering, municipal engineering facilities, solar support structures, outdoor decoration projects, humid and corrosive industrial environments.
Why Choose Us
Strict raw material selection, adopting standard Q195/Q235B carbon steel to ensure stable product quality
Precise production control, uniform wall thickness and standard size, low error rate
Complete product specifications, covering conventional and customized sizes
Dual product series of black and galvanized pipes to meet different engineering and usage scenarios
Adequate stock and stable production capacity, supporting long-term bulk export orders
Professional quality inspection system, all products pass strict performance testing before delivery
Support personalized customization and one-stop steel product matching services
