🟧 Product Overview

ASTM A588 / EN S355J2W / Q355GNH / SPA‑H represents the global high‑strength weathering steel family, widely known as Corten‑type steel. These steels develop a stable, dense oxide patina that protects the material from further corrosion, significantly extending service life in outdoor environments.

• ASTM A588 – The most widely used international weathering steel standard
• EN S355J2W – European structural weathering steel with excellent toughness
• Q355GNH – Chinese high‑strength atmospheric corrosion resistant steel
• SPA‑H – Japanese JIS G3125 weathering steel for structural applications

This international combination ensures compatibility with global engineering standards and project requirements.

🟧 Standards

• ASTM A588 – High‑Strength Low‑Alloy Structural Steel with Atmospheric Corrosion Resistance
• EN 10025‑5 – Structural Steels with Improved Atmospheric Corrosion Resistance
• JIS G3125 – SPA‑H Weathering Steel
• GB/T 4171 – Atmospheric Corrosion Resistant Structural Steel

🟧 International Weathering Steel Comparison Table

Country	Standard	Common Grades
America	ASTM A588 / A242	A588 Gr.A/B/C, A242
Europe	EN 10025‑5	S355J0W, S355J2W
China	GB/T 4171	Q295NH, Q355NH, Q355GNH
Japan	JIS G3125	SPA‑H
International	Corten Steel	Corten A, Corten B

🟧 Available Grades

• ASTM A588
• EN S355J2W
• Q355GNH
• SPA‑H

🟧 Product Specifications & Available Sizes

Dimensions

• Thickness: 1.5 – 20 mm
• Width: 1000 – 2000 mm
• Coil ID: 508 mm / 610 mm
• Coil OD: 900 – 2000 mm
• Coil Weight: 3 – 15 MT

Regular Sizes (mm)

Size	Size
1.5 × 1250 × C	3.0 × 1500 × C
2.0 × 1250 × C	4.0 × 1500 × C
2.5 × 1500 × C	5.0 × 1500 × C

🟧 Chemical Composition (A588 / S355J2W / Q355GNH – typical)

Element	Range (%)
C	≤ 0.12
Mn	0.20 – 1.60
P	0.035 – 0.150
S	≤ 0.030
Si	0.25 – 0.75
Cu	0.25 – 0.55
Cr	0.40 – 1.25
Ni	0.40 – 0.65

🟧 Mechanical Properties (A588 / S355J2W – typical)

Property	Value
Yield Strength	≥ 355 MPa
Tensile Strength	490–630 MPa
Elongation	≥ 20%
Impact Toughness	Excellent at low temperatures
Atmospheric Corrosion Resistance	2–8× carbon steel

🟧 Physical Properties

• Density: 7.85 g/cm³
• Modulus of elasticity: 210 GPa
• Thermal expansion: 12×10⁻⁶ /K

🟧 Manufacturing Processes

• Hot rolling
• Normalizing (optional)
• Pickling
• Leveling
• Slitting / Cutting to length
• Surface oiling

🟧 Primary Industry Usage

• Architectural façades
• Bridges and structural components
• Shipping containers
• Outdoor sculptures and landscape structures
• Railway vehicles
• Weather‑resistant building panels

🟧 Why Use A588 / S355J2W / Q355GNH / SPA‑H Weathering Steel Coil

• Forms a stable protective patina layer
• Excellent long‑term atmospheric corrosion resistance
• Reduced maintenance cost (no painting required)
• High strength and structural reliability
• Compatible with global engineering standards

🟧 Why Choose WelSteels

• Full range of international weathering steel coils
• Stable mechanical and corrosion‑resistant performance
• Custom coil cutting and slitting
• SGS / BV inspection available
• Export‑grade seaworthy packaging
• Reliable delivery for global projects