GOST 3634 ductile iron manhole cover refers to a type of access cover manufactured in compliance with Russia's national standard GOST 3634 (specifically for cast iron products used in municipal infrastructure). It is a heavy-duty ductile iron (nodular cast iron) component designed for underground facility access in Russia and CIS (Commonwealth of Independent States) countries, widely applied in road carriageways, municipal pipelines, and telecom JRC chambers.
This standard defines core requirements for material quality, mechanical performance, and structural safety, ensuring compatibility with Russia's infrastructure construction norms and climatic conditions.
Key Features of GOST 3634 Ductile Iron Manhole Cover
Strict Material & Mechanical Performance Requirements
Ductile Iron Specification: Adopts Russian-standard ductile iron grades (analogous to QT500-7 in international standards), with carbon content controlled at 3.5–3.9%, silicon at 2.2–2.8%, and magnesium at 0.03–0.05% , ensuring stable nodular graphite structure.
Mechanical Thresholds: Tensile strength ≥ 450MPa, elongation ≥ 6% (slightly adjusted from EN124's 500MPa/7% to adapt to local material supply characteristics), and impact toughness ≥ 15J at -20℃ (targeted for Russia's cold regions) .
Climate-Adapted Design
Low-Temperature Resistance: Optimized material formula and heat treatment process reduce brittle fracture risk in frigid environments (common in Siberia and northern Russia). Unlike standard EN124 covers, it undergoes mandatory -30℃ impact testing to ensure toughness retention ≥ 70% .
Sealing & Corrosion Protection: Equipped with frost-resistant rubber gaskets (resistant to -40℃ embrittlement) and zinc-aluminum alloy coating, addressing corrosion from road deicing salts and groundwater.
Scenario-Based Load Classification
Classified by application scenarios rather than pure load values:
Pedestrian Area (П class): For sidewalks and green belts, load-bearing ≥ 15kN (equivalent to EN124 A15).
Light Road (Д class): For residential roads, load-bearing ≥ 125kN (equivalent to EN124 B125).
Heavy Road (Т class): For highways and industrial zones, load-bearing ≥ 400kN (matching EN124 D400, aligned with your inspection document's D400 class requirement).
Structural Safety Focus
Anti-Settling Design: The frame adopts a "wide flange" structure with embedded depth ≥ 35mm (exceeding EN124's typical 30mm), preventing sinking under repeated vehicle pressure .
Tamper-Resistant Locking: Standardized rotating locking mechanisms (instead of EN124's common bolted locks) to adapt to Russia's anti-theft infrastructure demands.
Core Differences Between GOST 3634 and EN124
|
Items |
GOST 3634 (Russia) |
EN124 (Europe) |
|
Standard System |
National standard for Russia/CIS, regionally targeted |
International standard for Europe and global markets |
|
Load Classification |
Scenario-based (П/D/Т classes) |
Load-value based (A15/B125/C250/D400/E600/F900) |
|
Material Requirements |
Permits slight flexibility in elemental ratios (e.g., elongation ≥6%) |
Strict QT500-7 compliance (tensile ≥500MPa, elongation ≥7%) |
|
Low-Temperature Performance |
Mandatory -30℃ impact test, frost-resistant gaskets |
No special low-temperature requirements (relying on material inherent toughness) |
|
Dimensional Tolerance |
Frame fit clearance ≤ 4mm, focus on installation adaptability |
Frame fit clearance ≤ 3mm, strict EN 124 tolerance for precision |
|
Testing Focus |
Emphasizes low-temperature impact and corrosion resistance (salt spray test ≥ 500h) |
Prioritizes mechanical load cycling and structural durability (e.g., 400kN constant pressure for 30s ) |
|
Application Scope |
Russia, Belarus, Kazakhstan and other CIS countries |
Global (EU, Middle East like UAE, Southeast Asia) |
Product parameters
|
Place of Origin |
Hebei, China |
Brand Name |
SND |
|
Surface Treatment |
Asphalt paint/OEM |
Material |
Ductile iron |
|
Product name |
Manhole Cover |
Process |
Sand foundry |
|
Hardness |
HBS 170-230 |
Standard |
GOST 3634 |
|
Certification |
CE ISO9001 |
Load Class |
П/D/Т classes |
|
Quality Control |
100% Inspected |
Dimensions |
As drawings |
|
Shape |
OEM |
||
|
Additional Functions |
Anti-slip surface patterns. Optional anti-theft locks. Rubber sealing rings (leakproof) |
||
|
Customized Service |
Drawing design/Pattern/logo/words/coating |
||
Packaging and delivery
|
Package Solution |
Wooden pallet OEM |
|
Loading Port |
Tianjin Port/Qingdao Port/ |
|
Delivery time |
Within 15 days. New mold within 45 days. |
Dimensions in stock
|
Standard |
Class |
Outside Size |
Clear opening |
Height |
Hinge |
Lock |
|
GOST 3634 |
D400 |
Ф820mm |
Ф640mm |
100mm |
yes |
yes |
|
GOST 3634 |
D400 |
Ф790mm |
Ф650mm |
190mm |
yes |
yes |
|
GOST 3634 |
D400 |
850*850mm |
Ф600mm |
100mm |
yes |
yes |
|
GOST 3634 |
C250 |
Ф750mm |
Ф625mm |
100mm |
yes |
yes |
|
GOST 3634 |
C250 |
Ф750mm |
Ф625mm |
100mm |
yes |
yes |
|
GOST 3634 |
D400 |
Ф750mm |
Ф625mm |
100mm |
yes |
yes |
|
GOST 3634 |
D400 |
Ф815mm |
Ф635mm |
180mm |
yes |
yes |
Welcome contact us for more dimensions.
Inspection Items
Material Composition Inspection
Verify that ductile iron complies with the GGG50/QT500-7 standard, ensuring the contents of carbon, silicon, and magnesium meet specified qualification thresholds (no substandard elemental ratios).
Dimensional Accuracy Inspection
Measure critical parameters including manhole cover diameter, thickness, and frame fit clearance; confirm all dimensions align with EN 124 tolerance requirements to avoid assembly or usage issues.
Mechanical Performance Inspection
Assess key mechanical properties: tensile strength must reach a minimum of 500MPa, elongation must be no less than 7%, and load-bearing tests must be conducted for D400, E600, and F900 classes (per respective class standards).
Structural Function Inspection
Evaluate structural usability: hinge opening angle should be at least 110° (for easy access), locking mechanisms must demonstrate reliable operation, and seal rings must effectively block water and dust ingress.
Surface Quality Inspection
Check for surface defects (e.g., cracks, sand holes) to ensure no visible or functional flaws exist; verify the anti-corrosion coating's adhesion (to prevent peeling) and its resistance to corrosive environments.
Safety Performance Inspection
Validate safety-focused functions: confirm anti-settling stability (to avoid sinking under load), anti-bouncing reliability (to prevent noise or displacement), and anti-theft features (e.g., tamper-resistant fasteners) work as designed.
Certifications
SND has fully passed the ISO9001 quality management system certification and CE. During the production process, it implements a number of strict detailed standards and conducts full-process quality control. Our company has well-equipped chemical laboratories and physical performance laboratories. A complete set of testing equipment such as Direct Reading Spectrometer, Metallographic Microscope, Hardness Tester, Universal Material Testing Machine and Pressure test machine can be used to effectively control chemical composition and ensure mechanical performance.
FAQ
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