HRB400 Rebar 25mm Q345B

HRB400 Rebar 25mm Q345B

This table outlines the technical specifications of HRB400 25mm rebar (specialized for robust concrete reinforcement) and Q345B steel (high-strength structural material), highlighting their complementary roles in demanding construction scenarios.

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Product details

HRB400 Rebar 25mm, combined with Q345B high-strength steel, forms a robust and versatile solution for medium-to-heavy construction projects. This 25mm diameter deformed rebar delivers exceptional reinforcement for concrete structures, while Q345B—a premium low-alloy steel—complements it in critical structural components, creating a balanced system that excels in strength, durability, and adaptability.

Parameter	HRB400 Rebar 25mm	Q345B Steel	Unit	Remarks
Material Grade	HRB400 (High-Strength Deformed Reinforcing Bar)	Q345B (Low-Alloy High-Strength Structural Steel)	—	Both meet Chinese national standards for heavy-duty construction
Chemical Composition	C ≤0.25%, Si ≤0.80%, Mn ≤1.60%, P ≤0.045%, S ≤0.045%, with trace Nb, V, Ti	C ≤0.20%, Si ≤0.50%, Mn 1.00–1.60%, P ≤0.040%, S ≤0.040%, with trace Nb, V, Ti	—	Alloying elements enhance strength and toughness in both grades
Diameter/Section	25	N/A (varies by form: profiles, plates, bars)	mm	25mm diameter for medium-to-heavy reinforcement; Q345B available in multiple forms
Weight per Meter	3.85	N/A (varies by section/thickness)	kg/m	Calculated for 25mm rebar; Q345B weight depends on specific form
Length Range	6000–12000 (customizable)	6000–12000 (customizable)	mm	Standard lengths for large-scale construction projects
Yield Strength (Minimum)	≥400	≥345	MPa	High load-bearing capacity for critical structural elements
Tensile Strength	540–680	470–630	MPa	Typical range at room temperature
Elongation (δ5, Minimum)	≥16	≥22	%	Ensures ductility for seismic and dynamic load resistance
Impact Toughness	≥34 (at 20°C)	≥34 (at 20°C)	J	Longitudinal specimens; resistance to sudden impact loads
Surface Treatment	Deformed (ribbed) for concrete bonding	Mill finish, hot-dip galvanized, or epoxy-coated	—	HRB400 ribs enhance concrete adhesion; Q345B coatings improve corrosion resistance
Manufacturing Standard	GB 1499.2-2018	GB/T 1591-2018	—	Compliance with Chinese structural steel regulations
Typical Applications	Medium-to-heavy reinforced concrete (columns, beams, bridges, industrial foundations)	Heavy/medium structural components (girders, frames, heavy machinery supports)	—	Coordinated use in commercial, industrial, and infrastructure projects