When choosing a steel door, it is necessary to consider the usage scenario (such as residential security, fire compartment, medical or industrial use), performance requirements, and budget. Here are the key points for selection:
Clear Purpose and Corresponding Standards
Security Use (such as residential entrance): Select a steel security door that meets GB 17565-2022 "General Technical Requirements for Security Doors." Security levels are divided into Class A, B, C, and D, with D being the lowest threshold. The break-in time should be ≥15 minutes, suitable for standard residences.
Fire Use (such as pipe shafts, stairwells): Choose a steel fire door that meets GB 12955-2008 "Fire Doors." Class C has a fire resistance limit of ≥0.5 hours, Class B ≥1 hour, and Class A ≥1.5 hours; entrance doors should not use Class C fire doors and must be at least Class B.
Special Scenarios (such as hospitals): Medical steel doors should meet requirements for moisture resistance, wear resistance, and easy cleaning; door frames should be ≥1.5mm hot-dip galvanized steel, door panels ≥0.8mm, and equipped with 304 stainless steel hardware.
Core Selection Indicators
Steel Plate Thickness
Security Door: Door panel outer plate ≥0.8mm (premium products ≥0.9mm), door frame ≥1.2mm.
Fire Door: Door frame ≥1.2mm, door panel ≥0.8mm.
Filling Materials: Honeycomb paper, rock wool, or perlite, which affect sound insulation, heat insulation, and impact resistance; rock wool has better flame resistance.
Locks and Hardware
Security door locks should be certified at GA/T73-2015 Class D or above and have reinforced steel protection.
Fire doors must be equipped with fire-certified closers and fire locks.
Weight and Structure: Qualified security doors should be ≥40kg, the door body should have no obvious deformation, and welding should be firm.