S250GD Pre-Painted Galvanized Coil

S250GD Pre-Painted Galvanized Steel Coil is a high-strength structural steel product that combines the exceptional durability of galvanized coating with the aesthetic appeal and additional protection of pre-painting. This advanced material is manufactured according to international standards, with "S" denoting structural steel, "250" indicating the minimum yield strength of 250 MPa, "GD" representing good cold-forming properties, and "Z" signifying pure zinc coating.

Inquiry

E-mail：vincent@ruixiangsteel.cn

WhatsApp：+86 139 6417 9367

Detailed Description

S250GD Pre-Painted Galvanized Steel Coil is a high-strength structural steel product that combines the exceptional durability of galvanized coating with the aesthetic appeal and additional protection of pre-painting. This advanced material is manufactured according to international standards, with "S" denoting structural steel, "250" indicating the minimum yield strength of 250 MPa, "GD" representing good cold-forming properties, and "Z" signifying pure zinc coating. The pre-painted version undergoes additional surface treatment processes that make it ready for installation without requiring further finishing, providing both functional and decorative benefits for various applications.

Product Name	S250GD Pre-Painted Galvanized Coil
Standard	ASTM,DIN,JIS,BS,GB/T, etc.
Material	S250GD
Surface	black painted, anti rust varnished, PE coated, anti rust oiled, galvaniZed, checkered, color coated
Width	600mm-1500mmor as required
Thickness	0.12mm-6.00mm or as required
Technical Methods	Hot Rolled/Cold rolled
Coil ID	508-610mm or as per your request
Packaging	According to customer required
Coil Weight	3-5 Tons, or as required
Application	Construction, machinery manufacturing, container manufacturing, shipbuilding, bridges, etc.
Packing	Standard Seaworthy Packing (Plastic film in the first layer,second layer is Kraft paper. Third layer is galvanized sheet)
MOQ	1 Ton, more quantity price will be lower
Zinc coating	30-275g/m2
Color	Standard Color: red, blue, White, Gray Special Colors: based on Ral colors

Key Features and Advantages

Superior Corrosion Resistance: The combination of zinc protection (typically Z100-Z275 coating weights) and paint layer creates a double barrier against environmental elements, significantly extending the product's service life in harsh conditions.
Excellent Formability: Despite its high strength, S250GD maintains good plasticity and toughness, allowing for bending,(stamping), deep drawing, and other forming operations without cracking or damage.
Enhanced Aesthetic Appeal: Available in various standard colors (including RAL shades such as 3009, 9010, 7016, 9002, and 8017) and finishes, it offers consistent appearance and eliminates the need for post-installation painting.
Significant Economic Efficiency: The pre-finished nature reduces installation time and labor costs, while the durability minimizes maintenance requirements over the product's lifespan, providing long-term cost savings.
Environmental Sustainability: The production process incorporates environmental considerations, and the long service life contributes to reduced resource consumption over time.

Technical Specifications

Parameter	Specification	Details
Base Material	S250GD+Z	Structural steel with min. yield strength 250 MPa
Coating Type	Pure zinc (Z) or Zinc-iron alloy (ZF)	Hot-dip galvanized
Zinc Coating	Z100-Z275	100-275 g/m² (3.5-9.6 oz/ft²)
Thickness Range	0.12mm - 1.8mm	Custom sizes available
Width Range	600mm - 1250mm	Can be customized
Paint Coating	Top: 15-50μm, Back: 5-50μm	Polyester polyurethane, RAL colors
Mechanical Properties
Yield Strength (Rp0.2)	≥250 MPa
Tensile Strength (Rm)	≥496 MPa
Elongation	≥42%
Standard Applications	Roofing, walling, industrial projects	Construction, automotive, appliances

Manufacturing Process

The manufacturing of S250GD Pre-Painted Galvanized Steel Coil involves several precise stages:

Galvanizing: The base steel undergoes hot-dip galvanizing in a continuous process, where it's immersed in molten zinc to create a protective layer.
Surface Treatment: The galvanized surface is prepared through chemical pretreatment including cleaning, etching, and passivation to ensure optimal paint adhesion.
Priming: Application of a protective primer layer enhances corrosion resistance and provides additional protection.
Painting: High-quality paint systems (typically polyester polyurethane) are applied through precise roller coating techniques, followed by curing at controlled temperatures.
Finishing: Additional protective layers may be applied, including passivation treatments or protective films.
Inspection and Coiling: The finished product undergoes quality inspection before being coiled for shipment.

Applications

S250GD Pre-Painted Galvanized Steel Coil is versatile and suitable for numerous applications:

Architectural Applications: Industrial, commercial, and residential roofing and wall cladding systems, curtain walls, signage, and decorative elements.
Building Components: Interior decoration materials, partition panels, ceiling systems, fire doors, and insulation panels.
Household Appliances: Manufacturing of gas boilers, oven housings, kitchen range hoods, and other appliance exteriors.
Industrial Products: Storage containers, corrugated sheets, fencing, piping, and various structural components.