S350GD Pre-Painted Galvanized Coil represents a high-performance metallic material that combines structural strength with superior corrosion resistance and aesthetic appeal. This product is essentially a hot-dip galvanized steel coil with a pre-painted organic coating applied over the zinc layer, creating a multifaceted material that offers both protection and visual elegance. The designation "S350GD" follows the European standard EN 10346-2009, where "S" stands for structural steel, "350" indicates the minimum yield strength of 350 MPa, "GD" signifies hot-dip galvanizing, and the pre-painted aspect refers to the additional colored coating applied to the galvanized surface.

Key Features and Advantages

The base material of S350GD galvanized steel undergoes a continuous hot-dip process where the steel substrate is immersed in molten zinc to create a metallurgical bond. This galvanized coil then receives a precision coating application through a roller coating process, where primers and topcoats are uniformly applied and cured under controlled conditions. The resulting product exhibits the mechanical properties of structural steel while benefiting from the combined protective qualities of both zinc and organic polymer coatings.

This advanced material is available in various dimensions and specifications to meet diverse industrial requirements. The thickness of the steel substrate typically ranges from 0.3mm to 3.5mm, with widths available from 600mm to 1500mm. The zinc coating weight can vary from Z30 to Z275 (indicating zinc coating mass of 30-275 g/m²), allowing engineers to select the appropriate level of corrosion protection for their specific application environments.

S350GD Pre-Painted Galvanized Coil offers exceptional mechanical properties that make it suitable for structural applications where both strength and formability are required. The base steel provides a minimum yield strength of 350 MPa and a tensile strength of approximately 400 MPa, ensuring reliable performance under structural loads. This combination of strength and durability allows designers to create lighter structures without compromising integrity, contributing to material efficiency and potential cost savings.

The material maintains an elongation capability of at least 16% (with Lo = 80 mm), providing adequate formability for various manufacturing processes including bending, profiling, and roll-forming. This balance between strength and ductility is achieved through careful control of the steel's chemical composition and processing parameters during production. The chemical composition typically includes limited amounts of carbon (≤0.2%), silicon (≤0.6%), manganese (≤1.7%), phosphorus (≤0.1%), and sulfur (≤0.045%), which contributes to both the mechanical properties and weldability of the material.