50x50 50x150 100x100 100x200 Hot Dipped Galvanized Steel

Hot Dipped Galvanized Steel (HDG Steel) in specifications of 50x50, 50x150, 100x100, and 100x200 (typically referring to square/rectangular steel sections like tubes, bars, or profiles) integrates the structural advantages of standardized steel sections with the superior anti-corrosion performance of hot-dip galvanization. Its core features are detailed as follows:

1. Exceptional Corrosion Resistance & Long Service Life

• Dual-Layer Protective Coating: The steel is immersed in molten zinc (450°C), forming a dense protective layer composed of a "zinc-iron alloy layer" (inner) and a "pure zinc layer" (outer) with a thickness of ≥85μm. This coating acts as both a physical barrier (isolating steel from moisture, oxygen, and corrosive media like salts or industrial fumes) and a "sacrificial anode"—if the zinc layer is scratched, zinc oxidizes preferentially to protect the underlying steel from rust spread.

• Verified Durability: According to ISO 9223 standards, HDG steel with an 85μm zinc layer has a theoretical service life of over 50 years in industrial atmospheric environments. In salt spray tests, its corrosion resistance is 5–8 times that of ordinary painted steel, making it ideal for outdoor, coastal, or humid applications.

2. High Structural Strength & Reliable Mechanical Performance

• High-Quality Base Steel: These HDG sections are typically made of premium carbon structural steel (e.g., Q235B) or low-alloy high-strength steel (e.g., Q345B), ensuring excellent load-bearing capacity. For example:

• A 50x50 HDG square tube (wall thickness 3mm) has a tensile strength of 375–460MPa, yield strength ≥235MPa, and elongation ≥26%;

• A 100x100 HDG square bar (solid) can withstand bending moments up to 120N·m without permanent deformation, meeting structural requirements for supports, frames, or load-bearing components.

• Uniform Force Distribution: The 50x150 and 100x200 rectangular sections feature optimized aspect ratios, which enhance their resistance to lateral bending and torsion—critical for applications like building trusses, billboard frames, or mechanical supports where uneven stress may occur.

Structural engineering (buildings, bridges, towers)

Machinery manufacturing

Steel frameworks and fabrication

Transportation equipment

Furniture and architectural projects

Fencing, gates, and support columns