Low-Alloy and High-Strength Steel Plate (SS490)

1. General Overview

SS490 is a type of low-alloy high-strength steel plate widely used in structural applications. The "SS" in its designation typically stands for "Structural Steel," while "490" indicates the minimum tensile strength of 490 MPa. This steel is known for its balanced combination of strength, ductility, and weldability, making it suitable for various engineering and construction projects.

2. Standards and Specifications

Japanese Standard: SS490 is often specified under the Japanese Industrial Standard (JIS), particularly in JIS G3101 (Hot-rolled steel plates, sheets, and strips for general structural use).

3. Chemical Composition

While specific compositions may vary by manufacturer and standard, typical chemical elements in SS490 include:

 

Element	Content Range (%)	Role
Carbon (C)	≤ 0.20	Balances strength and ductility; lower content improves weldability.
Silicon (Si)	≤ 0.55	Deoxidizer; enhances strength slightly.
Manganese (Mn)	0.60–1.50	Improves strength and hardenability; aids in deoxidation.
Sulfur (S)	≤ 0.045	Controlled to minimize brittleness and hot cracking.
Phosphorus (P)	≤ 0.045	Controlled to reduce cold brittleness.
Alloying Elements	Trace (e.g., Cu, Ni, Cr for corrosion resistance in some variants)	Enhance specific properties like 耐腐蚀性 (corrosion resistance).

 

 

 

 

 

 

 

 

 

 

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