Item specifics

Casting Metals
Grey Cast Iron, GG20 / GG25, EN-GJL-200 / 250
Casting Manufacturing
Resin Coated Shell Mold Casting
Main Materials
Ferrous Metal, Non-Ferrous Metal
Surface Treatment
Shot Blasting, Sand Blasting, Satin, Polishing
Heat Treatment
Annealing, Normalizing, Quenching, Tempering,
CNC Machining
Available by CNC Machines and Machining Centers
Dimensional Inspection, Chemical Composition,
Engineering Service
Price Terms



Custom grey cast iron shell mold castings with services of heat treatment and surface treatment. 

Shell molding casting process is also called pre-coated resin sand casting process, hot shell molding castings or core casting process. The main molding material is the pre-coated phenolic resin sand, which is more expensive than green sand and furan resin sand. Moreover, this sand can not be recycle used. 

Furan resin self-hardening sand casting process (nobake process) uses the furan resin coated sand to form the casting mold. After mixing the original sand (or reclaimed sand), liquid furan resin and liquid catalyst evenly, and filling them into the core box (or sand box), and then tighten it to harden into a mold or mold in the core box (or sand box) at room temperature. Then the casting mould or casting core were formed, which is called self-hardening cold-core box molding (core), or self-hardening method (core).

Because the mold is formed at room temperature and no need to heat, the self-hardening sand casting is also called no-bake casting process. The self-hardening method can be divided into acid-catalyzed furan resin and phenolic resin sand self-hardening method, urethane resin sand self-hardening method and phenolic monoester self-hardening method.

As a self-hardening cold box binder sand, furan resin sand is the earliest and currently most widely used synthetic binder sand in Chinese foundry. The amount of resin added in molding sand is generally 0.7% to 1.0%, and the amount of added resin in core sand is generally 0.9% to 1.1%. The content of free aldehyde in furan resin is below 0.3%, and some factories have dropped to below 0.1%. In the foundries in China, the furan resin self-hardening sand has reached the international level regardless of the production process and the surface quality of the castings.

Gray iron, or grey cast iron, is a type of cast iron that has a graphite microstructure. It is named after the gray color of the fracture it forms. The gray cast iron is used for housings where the stiffness of the component is more important than its tensile strength, such as internal combustion engine cylinder blocks, pump housings, valve bodies, electrical boxes, counter weights and decorative castings. Grey cast iron's high thermal conductivity and specific head capacity are often exploited to make cast iron cookware and disc brake rotors.

A typical chemical composition to obtain a graphitic microstructure is 2.5 to 4.0% carbon and 1 to 3% silicon by weight. Graphite may occupy 6 to 10% of the volume of grey iron. Silicon is important to making grey iron as opposed to white cast iron, because silicon is a graphite stabilizing element in cast iron, which means it helps the alloy produce graphite instead of iron carbides; at 3% silicon almost no carbon is held in chemical combination with the iron.

The graphite takes on the shape of a three-dimensional flake. In two dimensions, as a polished surface will appear under a microscope, the graphite flakes appear as fine lines. The tips of the flakes act as preexisting notches; therefore, it is brittle. The presence of graphite flakes makes the Grey Iron easily machinable as they tend to crack easily across the graphite flakes. Grey iron also has very good damping capacity and hence it is mostly used as the base for machine tool mountings.


Mechanical Properties of Gray Cast Iron

Item according to DIN EN 1561MeasureUnitEN-GJL-150EN-GJL-200EN-GJL-250EN-GJL-300EN-GJL-350
EN-JL 1020EN-JL 1030EN-JL 1040EN-JL 1050EN-JL 1060
Tensile StrengthRmMPA150-250200-300250-350300-400350-450
0.1% Yield StrengthRp0,1MPA98-165130-195165-228195-260228-285
Elongation StrengthA%0,3 – 0,80,3 – 0,80,3 – 0,80,3 – 0,80,3 – 0,8
Compressive StrengthσdBMPa6007208409601080
0,1% Compressive Strengthσd0,1MPa195260325390455
Flexural StrengthσbBMPa250290340390490
Shear StressTtBMPa170230290345400
Modules of elasticityEGPa78 – 10388 – 113103 – 118108 – 137123 – 143
Poisson numberv0,260,260,260,260,26
Brinell hardness HB160 – 190180 – 220190 – 230200 – 240210 – 250
Tension and pressure changeσzdWMPa4050607585
Breaking StrengthKlcN/mm3/2320400480560650
Density g/cm37,107,157,207,257,30


cast iron shell casting foundry



Equivalent Grade of Grey Cast Iron

A48-20B0.6010GG-10Grade 1000110-00--FC 100G 10
A48-25B0.6015GG-15Grade 1500115-00Ft 15 DFG 15FC 150G 15
A48-30B0.6020GG-20Grade 2000120-00Ft 20 DFG 20FC 200G 20
A48-40B0.6025GG-25Grade 2500125-00Ft 25 DFG 25FC 250G 25
A48-45B0.6030GG-30Grade 3000130-00Ft 30 DFG 30FC 300G 30
A48-50B0.6035GG-35Grade 3500135-00Ft 35 DFG 35FC 350G 35
A48-60B0.6040GG-40Grade 4000140-00Ft 40 D-FC 40-
32510 GTS-35B340/120815-00MN 35-10-FCMW 330-
A220-400100.8145GTS-45P440/70852-00MN 450-FCMP 440/490GMN 45
A220-500050.8155GTS-55-04P510/40854-00MP 50-5-FCMP 490GMN 55
A220-700030.8165GTS-65-02P570/30856-00MN 650-3-FCMP 590GMN 65
A220-70003-GTS-65P570/30858MN 60-3-FCMP 540-
A220-800020.8170GTS-70-02P690/20862-00MN 700-2-FCMP 690GMN 70



Resin Coated Sand Casting Metal and Alloys

Metal & AlloysPopular Grade
Gray Cast IronGG10~GG40; GJL-100 ~ GJL-350; 
Ductile (Nodular) Cast IronGGG40 ~ GGG80; GJS-400-18, GJS-40-15, GJS-450-10, GJS-500-7, GJS-600-3, GJS-700-2, GJS-800-2
Austempered Ductile Iron (ADI)EN-GJS-800-8, EN-GJS-1000-5, EN-GJS-1200-2
Carbon SteelC20, C25, C30, C45
Alloy Steel20Mn, 45Mn, ZG20Cr, 40Cr,   20Mn5, 16CrMo4, 42CrMo,
40CrV, 20CrNiMo, GCr15, 9Mn2V
Stainless SteelFerritic Stainless Steel, Martensitic Stainless Steel, Austenitic Stainless Steel, Precipitation Hardening Stainless Steel, Duplex Stainless Steel
Aluminium AlloysASTM A356, ASTM A413,  ASTM A360
Brass / Copper-based AlloysC21000, C23000, C27000, C34500, C37710, C86500,  C87600, C87400, C87800,  C52100, C51100
Standard: ASTM, SAE, AISI, GOST, DIN, EN, ISO, and GB



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