Ductile Iron Castings Foundry
Common Ductile Iron Castings – Global Standards & Grades
| Region | Grade | Tensile Strength (MPa) | Min. Elongation (%) | Matrix |
|---|---|---|---|---|
| ISO | 400-18 | 400 | 18 | Ferritic |
| GB / China | QT400-18 | 400 | 18 | Ferritic |
| EN / EU | EN-GJS-400-15 | 400 | 15 | Ferritic |
| ASTM / US | 60-40-18 | 414 | 18 | Ferritic |
| ISO | 450-10 | 450 | 10 | Ferrite-Pearlite |
| GB / China | QT450-10 | 450 | 10 | Ferrite-Pearlite |
| ISO | 500-7 | 500 | 7 | Ferrite-Pearlite |
| GB / China | QT500-7 | 500 | 7 | Ferrite-Pearlite |
| EN / EU | EN-GJS-500-7 | 500 | 7 | Ferrite-Pearlite |
| ISO | 600-3 | 600 | 3 | Pearlitic |
| GB / China | QT600-3 | 600 | 3 | Pearlitic |
| ISO | 700-2 | 700 | 2 | Pearlitic |
| GB / China | QT700-2 | 700 | 2 | Pearlitic |
Main Standards of Ductile Iron Castings
- ISO 1083:2018 – International standard for spheroidal graphite cast irons
- ASTM A536 – US standard for Ductile Iron Castings
- EN 1563 – European foundry grades
- GB/T 1348-2019 – Chinese national standard (aligned with ISO)
Ductile Iron Castings Typical Applications
- QT400-18 / GJS-400-15 / 60-40-18
Valves, pump housings, hubs, gearboxes, low-temperature components, pressure parts
- QT450-10 / QT500-7
Automotive components, brackets, housings, general machinery parts
- QT600-3 / QT700-2
Crankshafts, camshafts, gears, wear-resistant parts, heavy machinery
- QT800-2 / ADI grades
High-stress transmission parts, lightweight structural components
Material Characteristics
- Spheroidal graphite shape provides high strength, toughness and ductility
- Better castability, vibration damping and wear resistance than steel
- Lower cost and easier production compared to carbon steel castings
- Weldable and machinable with proper processing
| Manufacturing Method | Sand Casting(Resin Sand, Pre-Coated Sand, Clay Sand, Water glass sand, Green Sand,lost foam ) |
| Material Standard | GB, ANSI, BS, DIN, JIS, ASTM, ASME, AISI, etc carbon steel, low carbon steel, middle carbon steel, G35, G45, WCB, WCA, WCC, ISO 340-550, etc. Alloy Carbon steel: G25CrMo4, Heat Resistant Steel, etc. Stainless Steel: SUS 304, 304L, 316, 316L, CF8, CF8M, G-X7CrNiNb1189, etc. AS2074 or according to customer specific requirement. Ductile Iron:A536-Gr.60-40-18,GGG40,GGG50,FCD40,FCD50,Gr370-17,Gr420-12,etc Grey Iron:A48-No.20,25,30,GG10,GG15,GG20,FC10,FC15,FC20,Grade 150,180,220,FGL150,FGL200,FGL250,etc |
| Weight Range | 1 kg to 100 Tons |
| General Casting Tolerance | CT8-CT12 |
| Design Software | UG, Pro-E, Inventor |
| Dwg Format | STP, STEP, IGS,STP,X_T ,DXF,DWG , Pro/E, PDF, SLDPRT |
| Mould Manufacturing | Yes |
| Casting Stimulation | Yes |
| Ultimate machining tolerance | 0.005mm |
| Quality Control | RT,UT,MT,PT,CMM,SCAN,Chemical and Mechanical Property Testing,Spectrometer,etc |
| Finish Roughness | Ra12.5-Ra25 according to customer requirement |
| Logo/ID | Silk-screening, Laser Marking, Engrave,Painting |
| Heat Treatment | Normalization, Annealing, Quenching and Tempering, Case Hardening, Nitriding, Carbon Nitriding, Induction Quenching,etc |
| Surface Treatment | Shot/sand blast, Polishing, Surface Passivation, Painting , Anodizing,Powder coating, ED- Coating, Chrome Plating, zinc-plate, Dacromat coating, Finish Painting,hot-dip galvanizing, etc |
