Tensile Strength of Cast Gray Irons

Grey Cast Iron Tensile Strength

The cast iron is smelted in an iron melting furnace, and the result is cast iron (liquid). Then the liquid cast iron is cast into a casting, and this casting becomes an iron casting. Gray cast iron is a kind of iron-carbon alloy, and its section is gray, so it is called gray cast iron. In gray cast iron, carbon mainly exists in the form of flake graphite. As one of the widely used casting metals, cast gray iron has many advangates in costs, castability and machinablity.

Tensile strength is the main performance index for measuring gray cast iron. All countries use the tensile strength to classify gray cast iron. Below we list the tensile strength of different grades of gray cast iron. Hope it will be helpful to fellow colleagues.


Tensile Strength of Separately Cast Samples of Gray Cast Irons

Material Designation HT100 HT150 HT200 HT250 HT300 HT350
Equivalent Materials GG-10, EN-GJL-100 GG-15, EN-GJL-150 GG-20, EN-GJL-200 GG-25, EN-GJL-250 GG-30, EN-GJL-300 GG-35, EN-GJL-350
Tensile Strength (MPa) ≥100 ≥150 ≥200 ≥250 ≥300 ≥350


Tensile Strength of Cast-on Samples of Gray Cast Irons

Material Designation Wall Thickness of Casting (mm) Tensile Strength (MPa) ≥
Sample Bar Dia. (mm) Sample Block (mm) Castings (Reference)
φ30 φ50 R15 R25
HT150, GG-15, EN-GJL-150 20-40 130 / 120 / 120
40-80 115 115 110 / 105
80-150 / 105 / 100 90
150-300 / 100 / 90 80
HT200, GG-20, EN-GJL-200 20-40 180 / 170 / 165
40-80 160 155 150 / 145
80-150 / 145 / 140 130
150-300 / 135 / 130 120
HT250, GG-25, EN-GJL-250 20-40 220 / 210 / 205
40-80 200 190 190 / 180
80-150 / 180 / 170 165
150-300 / 165 / 160 150
HT300, GG-30, EN-GJL-300 20-40 260 / 250 / 245
40-80 235 230 225 / 215
80-150 / 210 / 200 195
150-300 / 195 / 185 180
HT350, GG-35, EN-GJL-350 20-40 300 / 290 / 285
40-80 270 265 260 / 255
80-150 / 240 / 230 225
150-300 / 215 / 210 205
Note: When the thickness is over 300 mm, the exact mechanical properties are confirmed by the venders and buyers.


Tensile Strength of Gray Iron Casting in Different Wall Thickness

Casting Wall Thickness (mm) Material Designation
HT100, GG-1, EN-GJL-100 HT150, GG-15, EN-GJL-150 HT200, GG-20, EN-GJL-200 HT250, GG-25, EN-GJL-250 HT300, GG-30, EN-GJL-300 HT350, GG-35, EN-GJL-350
Tensile Strength (MPa) ≥
2.5-4.0 130 175 220 / / /
4.0-10 270
10-20 100 145 195 240 290 340
20-30 90 130 170 220 250 290
30-50 80 120 160 200 230 260



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