The Science Behind Our Cold-Rolled Steel Fire Doors

Where Metallurgical Excellence Meets Uncompromising Safety

High-quality cold-rolled steel material parameters for fire-rated doors, designed to showcase technical excellence while appealing to commercial buyers:

Why Cold-Rolled Steel Dominates Fire Safety 

① Structural Integrity Under Extreme Heat 

Microcrystalline Advantage: Ultra-fine grain structure (ASTM 7-8) resists warping at 1000°F (538°C) for 90+ minutes 

Carbon Control: Precise 0.08% max carbon content prevents brittleness during thermal shock 

② Corrosion Defense System

✓ Z275 Galvanization: Dual-side 275g/m² zinc coating (EN 10346) 

✓ Chromate Conversion: Gold-iridescent passivation layer per MIL-DTL-5541F 

✓ Salt Spray Resistance: 1000+ hours white rust-free (ASTM B117) 

③ Precision Manufacturing Edge

Tandem Mill Processing: 5-stage reduction achieving Ra ≤0.8µm surface roughness 

Laser-Trimmed Edges: Burr-free cutting (≤0.02mm edge radius) for perfect seal alignment 

Certified Superiority   

► UL 10B/UL 10C: Validated ≤0.25mm/hour warpage at 1700°F (927°C) 

► NFPA 252: Zero flame penetration in 3-hour endurance tests 

► ISO 9001:2015 Controlled Process: Chemical composition variance ≤±0.01% 

Sustainable Strength 

Closed-Loop Production: 92% recycled steel content (SCS Recycled Content Certification) 

Low-VOC Coatings: Contribute to LEED v4.1 MRc2 & EQc11 credits 

Energy-Efficient: 37% lower embodied energy vs. hot-rolled alternatives (ISO 14040 LCA) 

When lives depend on structural integrity, metallurgical precision isn't optional. 

We engineer to micron-level tolerances so you can trust millimeter-perfect protection.