Q345B is a Chinese standardized low alloy, high strength structural steel. Its specification is often used in construction, machinery, and other applications that require a strong yet flexible material. Below is an overview of the Q345B steel specification:
Carbon (C): ≤ 0.20%
Silicon (Si): 0.50% max
Manganese (Mn): 1.00-1.60%
Phosphorus (P): ≤ 0.035%
Sulfur (S): ≤ 0.035%
Niobium (Nb), Vanadium (V), Titanium (Ti): Can be added as microalloying elements
Yield Strength:
≤16mm thickness: ≥345 MPa
16-40mm thickness: ≥335 MPa
40-63mm thickness: ≥325 MPa
63-80mm thickness: ≥315 MPa
80-100mm thickness: ≥305 MPa
100-150mm thickness: ≥295 MPa
Tensile Strength: 470-630 MPa
Elongation: ≥20% (for thickness ≤16mm)
ASTM: A572 Grade 50
EN: S355J2-steel_4448.html target=_blank class=infotextkey>S355JR
JIS: SM490
Q345B steel is widely used in bridges, vehicles, ships, buildings, pressure vessels, special equipment, and other structures that require a certain degree of strength and toughness.
Hot Rolled: Delivered in the hot-rolled state, with or without heat treatment.
Q345B is known for its combination of good weldability, strength, and ductility, making it a popular choice in various structural applications.
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