Here's a detailed introduction to SM490YB High Tensile Steel, a key structural steel in Japanese industrial standards:

1. Standard and Nomenclature

Standard: Complies with JIS G3106:2010 (Hot-rolled steel plates, sheets, and strips for welded structural use).

Naming Convention:

SM: Abbreviation for "Structural Steel for Medium-strength Welded Structures".

490: Minimum tensile strength of 490 MPa.

YB:

Y: Indicates "Yield strength specified" (as opposed to "F" for fatigue-resistant grades).

B: Denotes the thickness category (e.g., A, B, C for different plate thickness ranges).

 

Grade	Mechanical Property
	Tensile Strength(MPa)	Yield Strength(MPa)	% Elongation in 2 in.(50mm) min	Impacting Test Temperature(°C)
SM490YB	400-520	235	22	20

 

 

 

 

2. Key Characteristics

Balanced Strength and Ductility:

Tensile strength of 490–610 MPa makes it suitable for medium-to-heavy load structures.

Good elongation (≥21%) ensures ductility and resistance to deformation under stress.

Weldability:

Designed for ease of welding (e.g., arc welding, gas shielded welding) with controlled carbon content and low thermal cracking risk.

Commonly used in welded structures like bridges and buildings.

Cost-Effective Structural Steel:

Offers a balance of strength and affordability compared to higher-tensile grades (e.g., SM520, SM570).

 

 

 

 

 

 

Why Choose Us?
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Relying on the superior conditions and strong advantages of mass production, we are able to meet the different needs of our customers.

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