Ductile Iron Material Selection Guide for Pipeline Joints: EN-GJS-450-10, 500-7, 400-18
Ductile Iron (also known as nodular cast iron or spheroidal graphite iron) is widely used in various pipeline joint systems, including dismantling joints, pipe couplings, flange adaptors, and saddle clamps, thanks to its excellent strength, toughness, and machinability.
However, selecting the right ductile iron grade depends heavily on the pipeline’s pressure rating, temperature conditions, and installation environment.
As a professional manufacturer of ductile iron pipe joints, Judberd commonly uses EN-GJS-450-10, EN-GJS-500-7, and EN-GJS-400-18. Below is a full material selection guide for global buyers, project engineers, and importers.
EN-GJS-450-10 — Standard Ductile Iron Grade for Pipe Joints
Keywords: medium strength ductile iron, municipal water supply coupling material, standard dismantling joint material
Key Features:
Tensile strength ≥ 450 MPa
Elongation ≥ 10%
Structure: Ferrite + Pearlite
Balanced strength, toughness, and excellent machinability
Typical Applications:
Municipal water supply pipelines
Medium-pressure pipeline joints
General dismantling joints, couplings, flange adaptors, saddle clamps
Normal temperature or mild cold environments
EN-GJS-500-7 — High-Strength Ductile Iron for Heavy-Duty Pipeline Joints
Keywords: high strength ductile iron, high pressure dismantling joint, ductile iron coupling material selection
Key Features:
Tensile strength ≥ 500 MPa
Elongation ≥ 7%
Structure: Pearlite + Ferrite
Suitable for heavy load and large diameter applications
Typical Applications:
High-pressure industrial pipelines
Large-size dismantling joints and pipe supports
Outdoor installation (not suitable for extreme low temperatures)
EN-GJS-400-18 — Low Temperature Ductile Iron for Cold Climate Pipelines
Keywords: low temperature ductile iron, anti-brittle fracture pipe joint, ferritizing annealed ductile iron
Key Features:
Tensile strength ≥ 400 MPa
Elongation ≥ 18%
Mainly ferritic structure with excellent toughness
After ferritizing annealing heat treatment, outstanding low-temperature impact toughness
Typical Applications:
Cold climate underground pipelines (-20°C, -40°C or lower)
Low temperature water supply systems
Custom-made dismantling joints, couplings, and flange adaptors for low temperature use
Judberd Provides Professional Material Selection & Customized Solutions
Selecting the proper ductile iron pipe joint material is critical for long-term pipeline safety. With years of experience in ductile iron material applications, Judberd provides professional advice and fully customized production based on your project needs.
Contact Us: info@judberd.com
WhatsApp: 008615315522185