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aluminium angle extrusion |
Hot Extrusion
Hot extrusion is a hot working process, which means it is done above the material's recrystallization temperature to keep the material from work hardening and to make it easier to push the material through the die. Most hot extrusions are done on horizontal hydraulic presses that range from 230 to 11,000 metric tons (250 to 12,000 short tons). Pressures range from 30 to 700 MPa (4,400 to 100,000 psi), therefore lubrication is required, which can be oil or graphite for lower temperature extrusions, or glass powder for higher temperature extrusions. The biggest disadvantage of this process is its cost for machinery and its upkeep. |
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Hot extrusion temperature for various metals
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Material |
Temperature[¡É(¢µ)] |
Magnesium |
650-450 (650-850) |
Aluminium |
350-500 (650-900) |
Copper |
600-1100 (1200-2000) |
Steel |
1200-1300 (2200-2400) |
Titanium |
700-1200 (1300-2100) |
Nickel |
1000-1200 (1900-2200) |
Refractory alloys |
up to 2000 (4000) |
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