Gray cast iron parts
Gray cast iron is composed of two parts: flake graphite and steel matrix,graphite is discontinuous flakes, either straight or curved. Its matrix can be divided into two types: ferrite and pearlite. The application of gray cast iron is mainly determined by tensile strength and is used for various castings with complex shapes. When selecting cast iron grades, the wall thickness of the casting and the corresponding strength value must be considered. Gray cast iron is generally used in places where the stiffness of the component is more important than its tensile strength, such as internal combustion engines, cylinder blocks, pumps, housings, valve bodies, electrical boxes and decorations.
Gray cast iron features
1:Excellent wear resistance and shock absorption. Due to the presence of graphite, gray cast iron has better shock absorption than steel
2.Low mechanical properties. The tensile strength of gray cast iron is relatively low. The microstructure of gray cast iron is actually equivalent to steel full of holes or cracks. When stretched, its tensile strength value is much lower than that of steel.
3.Since gray cast iron has a high carbon content, close to the eutectic composition, its melting point is lower than that of steel, so it has good casting fluidity.
4.Gray cast iron has high thermal conductivity and specific heat capacity and is often used to make cast iron cookware and disc brake rotors.
5.The molten iron has good fluidity and can be used to cast very complex parts.Large specific volume of graphite reduces the shrinkage during solidification,simplifies the process, reduces the stress and obtains a dense structure.
6.The presence of graphite in gray cast iron is equivalent to the presence of many small notches, which are almost insensitive to surface defects and notches. Therefore, surface defects have little effect on the fatigue strength of cast iron, but its fatigue strength is lower than that of steel.
Gray iron Castings Parts
| Gray Iron Material Grades | ||||||||
| Country | Standard | Equivalent Grades of Grey Iron (Gray Cast Iron) | ||||||
| ISO | ISO 185 | 100 | 150 | 200 | 250 | 300 | 350 | – |
| China | GB 9439 | HT100 | HT150 | HT200 | HT250 | HT300 | HT350 | – |
| USA | ASTM A48 | – | NO.20 | NO.30 | NO.35 | NO.40 | NO.50 | NO.55 |
| NO.25 | NO.45 | NO.60 | ||||||
| Germany | DIN 1691 | GG10 | GG15 | GG20 | GG25 | GG30 | GG35 | GG40 |
| European | EN 1561 | EN-GJL-100 | EN-GJL-150 | EN-GJL-200 | EN-GJL-250 | EN-GJL-300 | EN-GJL-350 | |
| Japan | JIS G5501 | FC100 | FC150 | FC200 | FC250 | FC300 | FC350 | – |
| Italy | UNI 5007 | G10 | G15 | G20 | G25 | G30 | G35 | – |
| France | NF A32-101 | – | FGL150 | FGL200 | FGL250 | FGL300 | FGL350 | FGL400 |
| UK | BS 1452 | 100 | 150 | 200 | 250 | 300 | 350 | – |
| India | IS 210 | – | FG150 | FG200 | FG260 | FG300 | FG350 | FG400 |
| Spain | UNF | – | FG15 | FG20 | FG25 | FG30 | FG35 | – |
| Belgium | NBN 830-01 | FGG10 | FGG15 | FGG20 | FGG25 | FGG30 | FGG35 | FGG40 |
| Australia | AS 1830 | – | T150 | T220 | T260 | T300 | T350 | T400 |
| Sweden | SS 14 01 | O110 | O115 | O120 | O125 | O130 | O135 | O140 |
| Norway | NS11 100 | SJG100 | SJG150 | SJG200 | SJG250 | SJG300 | SJG350 | – |
| Min. Tensile Strength (Mpa) | 100 | 150 | 200 | 250 | 300 | 350 | – | |
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 gray cast iron parts
1: What casting process you offer?
We use sand casting, lost foam casting, resin sand casting and other process to make gray cast iron 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
