Tin bronze plate temperature range

Tin bronze plate should have low deformation resistance and good plasticity at extrusion temperature. The reasonable extrusion temperature range should be determined based on the plastic diagram, recrystallization diagram and phase diagram of the alloy, and considering the actual production situation.

The heating temperature is generally 0.75~0.95 times of the melting point temperature of the alloy. The upper limit of the extrusion temperature range can be determined according to the melting point of the metal and the alloy and the solid phase point temperature of the alloy on the phase diagram, so as to avoid the thermal brittleness (overheating and overburning phenomenon) during the extrusion. At the lower limit of the extrusion temperature range, good plasticity at high temperatures should be considered and the deformation resistance of metals and alloys should not be too high.

For the alloy with phase transition at high temperature, hot extrusion is carried out in single phase zone.

Hot extrusion should be carried out at the temperature within the high temperature plastic zone as far as possible to avoid transverse cracks. But at the same time, the surface properties of the alloy at high temperature should be considered to prevent excessive oxidation or bonding of the ingot surface. The viscosity of some alloys to tools increases with the increase of temperature, such as white copper, aluminum bronze, etc., so low temperature extrusion should be considered as far as possible. In addition, when considering the extrusion temperature, you also need to consider the extruder capacity. Large - ton extruders should be used when the extrusion temperature is lower.

Extrusion elbow deformation is large, deformation speed is fast, the friction between metal and tools will produce a lot of heat, can cause the extrusion process of ingot billet temperature rise. When determining the heating temperature, try to use the temperature lower limit extrusion.

Extrusion at different temperatures can obtain different mechanical properties, in the selection of extrusion temperature, should consider the performance requirements of the product. Some alloys, such as HPB 59-1, are extruded at higher temperature and have longer tail and increased residual pressure. When the brass is extruded, the temperature is too low, and the end of the extruded product is easy to form strip tissue.