JIS G3114 SMA490AW Weathering Steel Strong, Sustainable

 

 

 

 

 

JIS G3114 SMA490AW Weathering Steel

 

 

 

 

 

 

Belonging to the Japanese standard JIS G3114, it is part of the broader family of weathering steels, commonly known as Corten steel in many international markets.

 

The designation "SMA" refers to Steel for Atmospheric corrosion resistance, while "490" indicates a minimum tensile strength requirement in the range of 490 MPa, and the suffix "AW" specifies that the steel is intended for welding applications.

 

Engineers and project designers prefer SMA490AW when they require not only structural strength but also long-term durability against outdoor weather conditions, reducing or eliminating the need for painting and continuous maintenance.

 

 

Chemical Composition of SMA490AW

 

Element	Typical Content (%)	Function
Carbon (C)	≤ 0.12	Provides strength without compromising weldability
Silicon (Si)	0.20 – 0.55	Improves strength and resistance to oxidation
Manganese (Mn)	0.20 – 1.60	Enhances toughness and weldability
Phosphorus (P)	≤ 0.035	Controlled to avoid brittleness
Sulfur (S)	≤ 0.035	Limited to improve toughness
Copper (Cu)	0.25 – 0.55	Key for forming the protective rust layer
Chromium (Cr)	0.40 – 1.25	Increases atmospheric corrosion resistance
Nickel (Ni)	≤ 0.65	Improves toughness and corrosion resistance
Others (Mo, V, Nb)	Trace	Added in small amounts for fine grain structure

 

 

Mechanical Properties of SMA490AW

 

Property	Value (Typical)
Yield Strength (MPa)	≥ 355
Tensile Strength (MPa)	490 – 610
Elongation (%)	≥ 19
Impact Toughness	Good, even at low temperatures
Weldability	Excellent (low carbon equivalent)
Hardness (HBW)	~ 160 – 200

 

 

 

 

 

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