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
|
