Low-Carbon Low-Alloy High-Strength Steel Plates for Building Structures

1. Definition and Characteristics

Low-carbon low-alloy high-strength steel plates are materials based on low-carbon steel with small additions of alloying elements (e.g., manganese, silicon, vanadium, niobium, titanium). Strengthened through microalloying and thermo-mechanical controlled processing (TMCP), they offer:

 

High Strength: Yield strength (ReL) ranges from 295–690 MPa, significantly higher than common carbon steel (e.g., Q235).

Low Alloy Content: Total alloy content ≤5%, ensuring low cost and excellent weldability.

Superior Comprehensive Performance:

Low-temperature toughness (impact energy  at -20°C to -60°C).

Fatigue resistance and corrosion resistance.

Lightweight Advantage: Reduces steel usage by 10%–30% under the same load, cutting structural weight.

2. Common Grades and Standards

Standard System	Typical Grades	Yield Strength (MPa)	Application Scenarios
China GB/T 1591	Q355D/Q355E	355	Bridges, high-rise buildings, long-span structures
Europe EN 10025-3	S355NL	355	Low-temperature structures (e.g., Nordic buildings)
Japan JIS G3106	SM490A/B/C	325–390	Industrial factories, bridges
USA ASTM A633M	Grade C/D/E	345–450	High-rise structures and bridges in cold regions

 

 

 

 

 

 

 

 

3. Key Performance Indicators

Strength and Ductility:

Yield strength (ReL) ≥295 MPa (e.g., Q690 reaches 690 MPa).

Elongation (A5) ≥18% for structural ductility.

Low-Temperature Toughness:Impact energy (V-notch):

Q355D: ≥34 J at -20°C;

Q355E: ≥34 J at -40°C (suitable for frigid zones).

Weldability:

Carbon equivalent (CEV) ≤0.45%, low cracking sensitivity. Preheating at 80–120°C for plate thickness >25mm.

Corrosion Resistance:

Weathering grades (e.g., Q355NH) with Cu/P additions form dense rust layers to reduce corrosion and coating needs.

 

 

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