‌High-Strength Low-Alloy Structural Steel: Optimized for Heavy Load & Corrosion Resistance‌
This advanced low-alloy steel combines controlled chemical composition with tiered mechanical performance, ideal for structural components in construction, energy, and transport sectors‌.

‌Chemical Composition & Material Design‌

Engineered for weldability and environmental durability, the alloy features precise impurity control:

• ‌Sulfur (S)‌: ≤0.025% (enhances machinability and hot workability)‌
• ‌Nitrogen (N)‌: ≤0.2% (improves austenite stabilization)
• ‌Aluminum (Al)‌: ≤0.2% (grain refinement agent)‌
• ‌Chromium (Cr)‌: ≤0.3% (oxidation resistance)
• ‌Copper (Cu)‌: ≤0.2% (atmospheric corrosion shielding)‌
• ‌Molybdenum (Mo)‌: ≤0.1% (elevated-temperature strength)
• ‌Nickel (Ni)‌: ≤1.0% (low-temperature toughness enhancer)
• ‌Niobium (Nb)‌: ≤0.05% (precipitation hardening)‌

Certification: ASTM A6/A6M-22 compliant with full traceability

‌Mechanical Properties by Thickness‌

Tailored strength gradients ensure optimal load distribution across structural profiles‌:

Test standards: ASTM E8/E8M (tensile), ISO 6892-1 (yield), EN ISO 2566-1 (elongation)

‌Key Performance Features‌

1. ‌Weld Efficiency‌
   • Pcm ≤0.22% enables crack-free welding without preheat below 25mm thickness‌
   • 87% joint efficiency with E7018 electrodes (AWS D1.1 compliant)‌
2. ‌Environmental Resistance‌
   • 0.035 mm/year corrosion rate in industrial atmospheres (ISO 9223 C3 class)‌
   • 40% better pitting resistance vs. S355J0 in coastal environments‌
3. ‌Cost Efficiency‌
   • 18% weight reduction compared to Q345B at equivalent strength‌
   • 25% lower fabrication costs than A572 Gr.50 through reduced machining time‌

‌Industrial Applications‌

• ‌Construction‌: Bridge girders (60mm) with 650 MPa cyclic load capacity
• ‌Energy‌: Wind turbine base rings (80mm) in -30°C environments
• ‌Transport‌: Mining truck chassis (50mm) resisting 500 MPa impact loads
• ‌Manufacturing‌: Hydraulic press frames (100mm) at 300°C service temps

‌Processing Guidelines‌

‌Heat Treatment‌:

• Normalizing: 890-920°C × 1.5 mins/mm → forced air cooling‌
• Stress Relieving: 580-620°C × 2 mins/mm for dimensional stability‌

‌Machining Parameters‌:

‌Packaging‌: VCI-coated + edge protectors; 20-ton container loading capacity
‌Lead Time‌: 6-8 weeks for custom-cut plates (plasma/waterjet options available)

Packing And Delivery