The need for heat treatment trays to withstand high temperatures is determined by their core role in the heat treatment process, and the maximum temperatures that trays of different materials can withstand vary greatly, as follows:
1. Direct contact with high temperature environment
Heat treatment (such as quenching, annealing, tempering, carburizing, etc.) needs to be carried out in a high-temperature furnace, and the temperature is usually above 500℃. Some processes (such as high-temperature sintering and brazing) even exceed 1000℃. As a carrier for the workpiece, the tray must be placed in the furnace throughout the process and must withstand the high temperature environment in the furnace. Otherwise, it will be deformed, melted or oxidized due to high temperature, causing the workpiece to fall, contaminate or fail the process.
2. Ensure structural stability
The material will soften, creep (slowly deform) or oxidize at high temperatures. If the tray is not resistant to high temperatures, it will bend, crack, collapse and other problems. It will not only affect its own service life, but also cause unstable stacking of workpieces due to structural failure, causing uneven heating, collision deformation and other quality problems.
3. Adapt to temperature fluctuations
During the heat treatment process, there may be fluctuations in temperature rise and fall (such as rapid cooling during quenching). The tray needs to withstand the thermal stress caused by the sudden temperature change to avoid breaking (such as ceramic trays) or cracking (such as cast iron trays) due to poor thermal shock resistance of the material.
| Material Type | Specific Material | Maximum Temperature (℃) | Remarks |
| Metal Material | Ordinary heat-resistant steel (304) | 600-800 | Suitable for medium and low temperature heat treatment |
| High nickel-chromium heat-resistant steel (310S) | 1200-1300 | Long-term use temperature recommendation ≤1100℃ | |
| Heat-resistant alloy (Inconel) | 1100-1200 | The creep resistance is better than that of ordinary heat-resistant steel | |
| Cast iron (grey cast iron/ductile iron) | 500-600 | Easily oxidized and embrittled above 600℃ | |
| Ceramic Material | Alumina ceramics | 1600-1700 | Pure alumina ceramics have better high temperature resistance |
| Silicon carbide ceramics | 1600-1800 | Thermal shock resistance is better than that of alumina | |
| Other Materials | Graphite | 2000-2500 | Need to be used in vacuum or inert gas (easy to oxidize above 500℃ in air) |
Summary
High temperature resistance is the core performance requirement of heat treatment trays. The maximum temperature they can withstand depends on the material: metal trays are usually 600-1300℃, ceramic trays can reach above 1600℃, and graphite trays can withstand temperatures above 2000℃ (protective atmosphere required). When making actual choices, a comprehensive judgment must be made based on the specific heat treatment temperature, insulation time, and environment (such as whether it is exposed to corrosive gases) to avoid failure due to insufficient material temperature resistance.
Email: cast@ebcastings.com
The need for heat treatment trays to withstand high temperatures is determined by their core role in the heat treatment process, and the maximum temperatures that trays of different materials can withstand vary greatly, as follows:
1. Direct contact with high temperature environment
Heat treatment (such as quenching, annealing, tempering, carburizing, etc.) needs to be carried out in a high-temperature furnace, and the temperature is usually above 500℃. Some processes (such as high-temperature sintering and brazing) even exceed 1000℃. As a carrier for the workpiece, the tray must be placed in the furnace throughout the process and must withstand the high temperature environment in the furnace. Otherwise, it will be deformed, melted or oxidized due to high temperature, causing the workpiece to fall, contaminate or fail the process.
2. Ensure structural stability
The material will soften, creep (slowly deform) or oxidize at high temperatures. If the tray is not resistant to high temperatures, it will bend, crack, collapse and other problems. It will not only affect its own service life, but also cause unstable stacking of workpieces due to structural failure, causing uneven heating, collision deformation and other quality problems.
3. Adapt to temperature fluctuations
During the heat treatment process, there may be fluctuations in temperature rise and fall (such as rapid cooling during quenching). The tray needs to withstand the thermal stress caused by the sudden temperature change to avoid breaking (such as ceramic trays) or cracking (such as cast iron trays) due to poor thermal shock resistance of the material.
| Material Type | Specific Material | Maximum Temperature (℃) | Remarks |
| Metal Material | Ordinary heat-resistant steel (304) | 600-800 | Suitable for medium and low temperature heat treatment |
| High nickel-chromium heat-resistant steel (310S) | 1200-1300 | Long-term use temperature recommendation ≤1100℃ | |
| Heat-resistant alloy (Inconel) | 1100-1200 | The creep resistance is better than that of ordinary heat-resistant steel | |
| Cast iron (grey cast iron/ductile iron) | 500-600 | Easily oxidized and embrittled above 600℃ | |
| Ceramic Material | Alumina ceramics | 1600-1700 | Pure alumina ceramics have better high temperature resistance |
| Silicon carbide ceramics | 1600-1800 | Thermal shock resistance is better than that of alumina | |
| Other Materials | Graphite | 2000-2500 | Need to be used in vacuum or inert gas (easy to oxidize above 500℃ in air) |
Summary
High temperature resistance is the core performance requirement of heat treatment trays. The maximum temperature they can withstand depends on the material: metal trays are usually 600-1300℃, ceramic trays can reach above 1600℃, and graphite trays can withstand temperatures above 2000℃ (protective atmosphere required). When making actual choices, a comprehensive judgment must be made based on the specific heat treatment temperature, insulation time, and environment (such as whether it is exposed to corrosive gases) to avoid failure due to insufficient material temperature resistance.
Email: cast@ebcastings.com
