Gray Cast Iron Investment Casting Product

Gray Cast Iron Investment Casting Product

Material: Gray Cast Iron, GG15, GG20, GG25, GG30
Casting Process: Investment Casting
Weight: 2.50 kg

OEM gray cast iron investment casting product from China foundry. We also provide CNC machining, heat treatment, surface treatment and other custom services.


Custom Investment Casting Part of Grey Cast Iron from China Precision Casting Manufacturer

With reasonable price and rich engineering services, RMC Foundry could produce and provide OEM custom gray cast iron investment casting products from China foundry with silica sol investment casting process. Diverse materials to be available including gray iron, ductile iron, carbon steel, alloy steel, stainless steel and cast aluminium. Like ductile cast iron, the grey cast iron is usually cast by green sand casting or shell mold casting for normal castings, but if the customers need metal castings which need both high accuracy and good damping performance (shock absorbtion) such as the case, seats or bearing housing, then the investment castings of grey cast iron would be the best choice.

Mechanical Properties of Gray Cast Iron
Item according to DIN EN 1561 Measure Unit EN-GJL-150 EN-GJL-200 EN-GJL-250 EN-GJL-300 EN-GJL-350
EN-JL 1020 EN-JL 1030 EN-JL 1040 EN-JL 1050 EN-JL 1060
Tensile Strength Rm MPA 150-250 200-300 250-350 300-400 350-450
0.1% Yield Strength Rp0,1 MPA 98-165 130-195 165-228 195-260 228-285
Elongation Strength A % 0,3 – 0,8 0,3 – 0,8 0,3 – 0,8 0,3 – 0,8 0,3 – 0,8
Compressive Strength σdB MPa 600 720 840 960 1080
0,1% Compressive Strength σd0,1 MPa 195 260 325 390 455
Flexural Strength σbB MPa 250 290 340 390 490
Schuifspanning σaB MPa 170 230 290 345 400
Shear Stress TtB MPa 170 230 290 345 400
Modules of elasticity E GPa 78 – 103 88 – 113 103 – 118 108 – 137 123 – 143
Poisson number v 0,26 0,26 0,26 0,26 0,26
Brinell hardness HB 160 – 190 180 – 220 190 – 230 200 – 240 210 – 250
Ductility σbW MPa 70 90 120 140 145
Tension and pressure change σzdW MPa 40 50 60 75 85
Breaking Strength Klc N/mm3/2 320 400 480 560 650
Density g/cm3 7,10 7,15 7,20 7,25 7,30

Grey cast iron (also called grey cast iron) is a group of cast iron including several kinds of grade according to different designation of diverse standards. Gray cast iron is a kind of iron-carbon alloy and it gets its name "grey" from the fact that their cutting sections looks grey. The metallographic structure of gray cast iron is mainly composed of flake graphite, metal matrix and grain boundary eutectic. During the grey iron, the Carbon is in the flake graphite. As one of the widely used casting metals, cast gray iron has many advangates in costs, castability and machinablity.

Performance Characteristics of Gray Iron Castings

  • Liquid gray iron has good fluidity, and its volume shrinkage and linear shrinkage are small, and the notch sensitivity is small
  • Low comprehensive mechanical properties, compressive strength is about 3~4 times higher than tensile strength
  • Good shock absorption, the shock absorption of gray iron is about 10 times greater than that of cast steel
  • Gray iron has low modulus of elasticity

Structural Characteristics of Gray Iron Castings

  • Small wall thickness and complex shapes are available
  • The residual stress of the casting is small
  • Gray iron castings should not be designed with very thick structures, and asymmetrical sections are often used to make full use of their compressive strength

investment casting foundry

Investment casting, which is also known lost wax casting or precision casting, refers to the formation of ceramic around the wax patterns to create a multi or single part mold to receive molten metal. This process utilizes an expendable injection molded wax pattern process to achieve complex forms with exceptional surface qualities. To create a mold, a wax pattern, or cluster of patterns, is dipped into ceramic material several times to build a thick shell. De-wax process is then followed by the shell dry process. The wax-less ceramic shell is then produced. Molten metal is then poured into the ceramic shell cavities or cluster, and once solid and cooled, the ceramic shell is broken off to reveal the final cast metal object. Precision investment castings can achieve exceptional accuracy for both small and large casting parts in a wide range of materials.

What Are The Advantages of Investment Casting?

  • Excellent and smooth surface finish
  • Tight dimensional tolerances.
  • Complex and intricate shapes with design flexibility
  • Capability to cast thin walls therefore a lighter casting component
  • Wide selection of cast metals and alloys (ferrous and non-ferrous)
  • Draft is not required in the molds design.
  • Reduce the need for secondary machining.
  • Low material waste.

investment casting process