According to rough forging metal material types, different mechanical properties. Carbon steel, alloy steel and copper, aluminum and other non-metal alloy has good plasticity, can be forged. Cast iron plasticity poor immalleable.
　　Rough forging process different choice of materials according to the appropriate forging temperature range:
　　Forging temperature range: initial forging temperature and the final forging temperature between the temperature range.
　　Final forging temperature: metal material allows the minimum temperature deformation. Temperature is too low, forging laborious, could easily lead to fracture.
Before forging temperature: metal material forging heating the maximum temperature allowed. High temperature, easy to produce thermal defects.
　　Therefore, an appropriate temperature range is very important. Thermoelectric pyrometer can be used when heating or optical pyrometer temperature, or by "fire color method" to determine, but there will be errors.
　　Use appropriate heating equipment; usually flame and electric heating in two ways, according to the processing capacity and heat the metal material decisions.
　　Note: The high temperature alloys, high-alloy steel, non-ferrous alloys recommended resistance furnace.
　

Rough forging process is heated to prevent defects:
　　Oxidation and decarbonization. Press noun understood, metal loss due to oxidation; decarbonization cause the metal surface hardness and wear resistance decreased.
Internal cracks. Common stock in a larger size, cracks in the rough inner member. Common causes of heating too fast or installed furnace temperature is too high, generally high-carbon steel is easy to happen.
　　Overheating and over-burning. Press noun understood, overheating will cause the metal to coarse grains, after forging heat treatment process can make; overburnt will destroy the grain binding force, a forging that is broken, irreparable loss, avoid.