Keywords:‌

Square sewage manhole cover, China-made drainage cover, ductile iron cover, municipal drainage system, heavy-duty access cover, ISO9001 certified cover, Chinese foundry products, urban infrastructure components

Meta Description:‌

High-quality square sewage manhole cover manufactured in China using premium ductile iron material. Features advanced casting technology, superior load capacity (EN124 standard), and corrosion-resistant coating. Ideal for municipal drainage systems with 20+ years lifespan. Custom sizes and logos available.

Technical Specifications:‌

Material Advantages:‌

Primary material: QT500-7 ductile iron (Chinese GB/T1348 standard)

Material benefits:

• Higher strength than standard cast iron (tensile strength ≥500MPa)

• Better impact resistance (≥12J at -20℃)

• China-sourced raw materials with strict quality control

Manufacturing Process:‌

Sand Casting‌: Uses Chinese-developed resin sand molding technology

Heat Treatment‌: Computer-controlled annealing process

Machining‌: CNC precision machining for perfect fit

Surface Treatment‌:

Zinc spray coating (≥100μm)

Bitumen coating (inner surface)

Quality Control‌:

100% dimensional inspection

Batch testing for mechanical properties

Product Specifications:‌

Size range: 600x600mm to 800x800mm (custom sizes available)

Load classes: B125/C250/D400 (EN124 standard)

Weight: 50-120kg (depending on size/class)

Anti-slip design: Diamond pattern (≥5mm raised)

Locking options: Available with Chinese-standard locking mechanisms

Key Applications:‌

✓ Municipal sewage systems

✓ Road drainage networks

✓ Industrial park infrastructure

✓ Airport/port drainage

✓ Urban utility tunnels

China Manufacturing Advantages:‌

Cost Efficiency‌: Competitive pricing with 30-40% cost advantage over Western counterparts

Production Capacity‌: Ability to fulfill large-volume orders (10,000+ units/month)

Technical Expertise‌: 20+ years experience in drainage product manufacturing

Quality Certifications‌:

• ISO9001:2015 certified factories

• EN124/GB/T23858 compliance

Customization‌: Quick turnaround for custom designs/specifications

Supply Chain‌: Complete domestic supply chain ensuring stable delivery

Additional Services:‌

OEM/ODM support

Technical drawings provided

Export packaging (wooden cases/pallets)

Door-to-door shipping solutions