H-Type Billet Q345B

H-Type Billet Q345B

This H-Type Billet Q345B is widely used in the construction and engineering fields due to its excellent combination of strength, toughness and good workability. It can meet the diverse requirements of different structural designs and construction projects.

2010 ESTABLISHED

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Product details

Q345B H-Type Billet is a premium low-alloy high-strength structural steel engineered for demanding construction and engineering projects. Compliant with GB/T 1591-2008 standards, this H-profiled billet delivers an exceptional blend of strength, toughness, and workability, making it a preferred choice for structural frameworks requiring reliable performance under heavy loads.

Parameter	Value	Remarks
Standard Referenced	GB/T 1591-2008	Low alloy high-strength structural steel standard
Grade	Q345B	Impact test temperature is 20℃
Chemical Composition (wt%)
– Carbon (C)	≤0.20
– Silicon (Si)	≤0.55
– Manganese (Mn)	≤1.70
– Phosphorus (P)	≤0.040
– Sulfur (S)	≤0.040
– Niobium (Nb)	≤0.07	Microalloying element to improve properties
– Vanadium (V)	≤0.15
– Titanium (Ti)	≤0.20
– Nitrogen (N)	≤0.012
Mechanical Properties
– Yield Strength (ReL)	≥345 MPa	For thickness or diameter ≤16mm; use Rp0.2 if yield point not clear
– Tensile Strength (Rm)	470 – 630 MPa
– Elongation (A)	≥21%
– Impact Energy (Akv)	≥34 J	At 20℃, longitudinal specimen
– Bending Test	180°	Bend diameter: 2a for ≤16mm; 3a for >16mm (where ‘a’ represents relevant dimension like thickness or diameter)
Delivery Condition	Hot rolled, normalized, normalized + tempered, TMCP (Thermo-Mechanical Control Process) etc.	Based on customer’s specific order requirements
Typical Applications	H-shaped steel structures in construction, bridges, industrial buildings, and also for some framework components where high strength and good formability are needed