What is Ductile iron castings?
Ductile iron castings are cast iron parts with unique microstructures. They are high-strength iron castings produced through a specific process based on ordinary gray iron. The material functions is close to steel. They are used for parts with complex forces and high requirements for strength, durability, and wear resistance, mainly used in the automotive, engineering, and construction industries. Ductile iron castings many grade number are: QT400-700, GG400-700, EN-GJS-400-700. Ductile iron classification: low-temperature type, ordinary type
Ductile Iron Features
1.Tensile strength and yield strength are much higher than gray cast iron and comparable to steel.
2.The spherical structure of graphite has good toughness and is not prone to brittle fracture.
3.Ductile iron has good fluidity and can be cast into parts with complex shapes and accurate dimensions.
4.The machinability of ductile iron is similar to cast steel, and it can be machined by turning, milling, planing, grinding, etc.
5.Ductile iron has better fatigue resistance than gray cast iron and is suitable for parts subjected to alternating loads.
6.Ductile iron can maintain stable performance over a wide temperature range and is suitable for different environmental conditions.
Ductile Iron Castings Parts
| Ductile /Nodular Cast Iron Material Grades | |||||||
| Country | Standard | Equivalent Grades of Ductile iron (SG Iron, Nodular Graphite Iron) | |||||
| ISO | ISO 1083 | 400-15 | 450-10 | 500-7 | 600-3 | 700-2 | 800-2 |
| China | GB 1348 | QT400-18 | QT450-10 | QT500-7 | QT600-3 | QT700-2 | QT800-2 |
| USA | ASTM A536 | 60-40-18 | 60-42-10 | 70-50-05 | 80-55-06 | 100-70-03 | 120-90-02 |
| Germany | DIN 1693 | GGG40 | — | GGG50 | GGG60 | GGG70 | GGG80 |
| European | EN 1563 | EN-GJS-400-15 | EN-GJS-450-10 | EN-GJS-500-7 | EN-GJS-600-3 | EN-GJS-700-2 | EN-GJS-800-2 |
| Japan | JIS G5502 | FCD400 | FCD450 | FCD500 | FCD600 | FCD700 | FCD800 |
| Italy | UNI 4544 | GS370-17 | GS400-12 | GS500-7 | GS600-2 | GS700-2 | GS800-2 |
| France | NF A32-201 | FGS370-17 | FGS400-12 | FGS500-7 | FGS600-2 | FGS700-2 | FGS800-2 |
| UK | BS 2789 | 400/17 | 420/12 | 500/7 | 600/7 | 700/2 | 800/2 |
| India | IS 1865 | SG370/17 | SG400/12 | SG500/7 | SG600/3 | SG700/2 | SG800/2 |
| Spain | UNF | FGE38-17 | FGE42-12 | FGE50-7 | FGE60-2 | FGE70-2 | FGE80-2 |
| Belgium | NBN 830-02 | FNG38-17 | FNG42-12 | FNG50-7 | FNG60-2 | FNG70-2 | FNG80-2 |
| Australia | AS 1831 | 300-17 | — | 500-7 | 600-3 | 700-2 | 800-2 |
| Sweden | SS 14 07 | 0717-02 | — | 0727-02 | 0732-03 | 0737-01 | 0864-03 |
| Norway | NS11 301 | SJK-400.3 | — | SJK-500 | SJK-600 | SJK-700 | SJK-800 |
Ductile Iron Mechanical Properties
| Ductile Iron Grade in GB1348 Ductile Iron Castings | ||||
| Iron Grade | Wall Thickness | Tensile Strength(Min Mpa) | Yield Strength(Min Mpa) | elongation |
| /mm | % Min | |||
| QT400-18A | >30~60 | 390 | 250 | 18 |
| >60~200 | 370 | 240 | 12 | |
| QT400-15A | >30~60 | 390 | 250 | 15 |
| >60~200 | 370 | 240 | 12 | |
| QT500-7A | >30~60 | 450 | 300 | 7 |
| >60~200 | 420 | 290 | 5 | |
| QT600-3A | >30~60 | 600 | 360 | 3 |
| >60~200 | 550 | 430 | 1 | |
| QT700-2A | >30~60 | 700 | 400 | 2 |
| >60~200 | 650 | 380 | 1 | |
Sand casting process and equipment
Design and produce molds
We have established an engineering technology materials R&D center to invest more in product development and technological innovation. In line with the CAD and UG three-dimensional mold creation capabilities equipped with independent R&D, we can reduce design defects, improve casting quality, and improve product processing and casting methods, technologies and The improvements and innovations in the process have made Shengrong a complete solution provider in the high-end casting industry that integrates R&D and production.
Cast Star Horizontal Molding Line
Sinto Molding Machine
Coremaking machine
Melting and pouring
1T intermediate frequency furnace 3 sets.
Cleaning and heat treatment
Heat treatment furnaces
Machining centers
20 machining centers for casting parts
Inspetion and testing of casting parts
we have independent physical and chemical testing laboratory. The main testing equipment includes: 2 spectrometers, 2 universal material testing machines, C-S analyzer, Si-Mn-P high-speed analyzer, 2 metallographic microscopes, 2 Brinell hardness meters, impact testing machines, molding sand permeability detectors, independent physical and chemical testing laboratory,air permeability tester for molding sand, tensile tester for molding sand, high-frequency infrared moisture detector, ultrasonic flaw detector and various equipment. Sand tensile test detector, high-frequency infrared moisture detector, ultrasonic flaw detector and all kinds of equipment are complete.
Spectrometer
Carbon sulfur analyzer
Impact tester
Metallurgical microscope
Radial inspection machine
Hydraulic universal testing machine
The production of ductile iron casting
1: What casting process you offer?
We use sand casting, lost foam casting, resin sand casting and other process to make ductile iron casting parts
2: What size of the parts you are making?
We make the parts from 0.5kgs to 10000kgs, special size is available
3: What the lead time of production?
For samples, it need about 30days(model develop time 15-20 days, samples production time 10 days)
Bulk order after mold finished, it need about 20 days
4: What capacity do you have?
Our yearly production can reach to 4000 tons
5:Can you do the machining as our drawing?
Yes, please offer detailed 2D drawing
6: What about your after service?
We promise the QC pass rate 95%, if lower than this, we will send you new part free of charge
