Steel Door
Product Overview
Engineered for high-frequency operational environments in commercial construction, industrial plants, and institutional facilities, this heavy-duty steel door assembly provides structural security, compartmentation, and impact resistance. Constructed from commercial-quality galvanized steel over a rigid internal core, each unit is manufactured to standard or custom architectural dimensions. Designed to integrate directly with standard commercial hardware preparations, the door assembly satisfies rigorous building code and life-safety requirements.
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Key Features
Heavy-Gauge Galvanized Substrates: Formed from 16-gauge (1.5mm) to 20-gauge (1.0mm) hot-dipped galvanized steel sheets (ASTM A653 / SGCC), providing high tensile strength and intrinsic base-metal corrosion protection.
Precision Hardware Reinforcement: Factory-welded 7-gauge (4.5mm) hinge reinforcements and 12-gauge lock plates, precision-machined to prevent fastener pull-out and hardware sag under heavy operational cycles.
Interlocking Seam Construction: Mechanically interlocked vertical edges with epoxy bonding eliminate visible weld seams and prevent edge separation under high-humidity conditions.
Engineered Core Densities: Available with kraft honeycomb, rigid polyurethane foam, rockwool, or internal steel stiffeners to balance thermal insulation, acoustic rating, and impact absorption.
Multi-Stage Surface Pretreatment: Undergoes a 5-stage iron-phosphate wash and electrostatically applied powder coat finish, ensuring salt-spray resistance superior to standard liquid-primed doors.
Technical Specifications
|
Technical Parameter |
Specification Standard |
|
Door Leaf Thickness |
45 mm (1-3/4 inches) |
|
Face Sheet Material |
Cold-Rolled Galvanized Steel (SGCC / ASTM A653) |
|
Steel Thickness (Gauge) |
16 Ga (1.5mm) / 18 Ga (1.2mm) / 20 Ga (1.0mm) |
|
Internal Core Options |
Kraft Honeycomb / Polyurethane (PU) Foam / Rockwool / Steel Stiffened |
|
Standard Heights |
2032 mm (80") / 2134 mm (84") / Custom up to 3000 mm |
|
Standard Widths |
914 mm (36") / 1219 mm (48") / Custom up to 1200 mm (Single) |
|
Fire Rating Compliance |
UL 10C / UBC 7-2 Certified up to 3 Hours (180 Mins); EN 1634 |
|
Acoustic Performance |
STC 32 – STC 45 (dependent on core and perimeter gasketing) |
|
Surface Finish |
Electrostatic Powder Coating (Standard RAL color library) |
|
Hardware Prep Standard |
ANSI/BHMA A156.115 / EN 12209 compatible mortise or cylindrical prep |
|
Durability Cycle Test |
Certified to 1,000,000 operational cycles (ANSI/BHMA A156.4) |
Face Sheets: Dual-layer galvanized steel panels providing impact resistance, rigidity, and a uniform substrate for painting.
Internal Core Infill: Structural core bonded permanently to face sheets using structural polyurethane adhesives to prevent core shifting.
Internal Stiffener Channels: 14-gauge horizontal and vertical steel channels spot-welded within the internal perimeter for torsional load support.
Hardware Mounting Plates: Heavy-gauge internal steel reinforcements welded at hinge, lock, and closer zones to sustain high shear loads.
Top & Bottom End Channels: Inverted 16-gauge steel channels spot-welded to seal the top and bottom openings against moisture ingress and maintain structural squareness.
Applications
Industrial & Manufacturing Facilities
Plant utility rooms, electrical sub-stations, and heavy-traffic production zone partitions.
Commercial & Logistics Hubs
Loading dock offices, mechanical plant enclosures, and high-security storage areas.
Healthcare Environments
Corridor emergency access, sterile auxiliary rooms, and pharmacy security vaults.
Educational & Institutional Structures
Stairwell fire enclosures, laboratory access points, and utility service entries.
Available Types & Configurations
Single Swing Doors
Standard single-panel configuration for standard corridor and room entries.
Double Egress / Pair Doors
Active-inactive leaf pairs featuring overlapping astragals for wide equipment clearance.
Vision Panel Doors
Factory-cut and glazed with tempered or wired fire-rated glass lites (up to maximum allowable UL dimensions).
Louvered Doors
Integrated steel louvers with inverted split-v blades designed for equipment room ventilation and pressure relief.
Non-Standard Dimensions: Engineered to fit irregular wall openings, oversized clearances, or existing retrofit frames.
Hardware Pre-Machining: CNC-executed prep for panic exit devices, electric strikes, card readers, door coordinators, and drop seals.
Material Upgrades: Stainless Steel face sheets (Grade 304 or 316) available for corrosive or high-sanitation environments.
Acoustic & Weather Assemblies: Integrated drop-down bottom seals, adjustable perimeter weather-stripping, and heavy-duty thresholds.
Quality Control
Mill Test Certificate Verification
Every batch of incoming galvanized steel coils is checked for coating weight compliance (G90 / Z275) and yield strength.
CNC Machining Tolerances
Laser-guided cutting and punching maintain dimensional squareness within a strict tolerance window of +/-0.5 mm.
Weld Integrity Checks
Routine destructive and non-destructive weld testing on internal stiffener assemblies to verify structural shear strength.
Coating Adhesion & DFT Tests
Cross-hatch adhesion testing (ASTM D3359) and dry film thickness (DFT) gauges verify powder coat performance on every production batch.
Packaging & Shipping
Edge & Surface Protection
High-density corner guards, edge corrugated wrapping, and heavy-duty polyethylene moisture-barrier film.
Palletization & Bracing
Steel doors are banded securely to fumigated wooden skids or structural steel transport frames to prevent forklift damage during handling.
Hardware Segregation
Associated hinges, locks, and fasteners are packed in independent labeled cartons and braced within the frame profile or crated separately.
Container Optimization
Engineered for 20GP/40HQ ocean freight stuffing with internal dunnage bracing to eliminate transit shift and friction damage.
FAQ
As one of the leading steel door manufacturers and suppliers in China, we warmly welcome you to buy discount steel door for sale here from our factory. All products are with high quality and competitive price. Contact us for quotation.
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