Facts about Heat-resistance Temperature and Heating Process of Stainless Steel Containers

Recently we got some questions from our customer about, how high is the heat resistant temperature of the stainless steel container. You may want to ask this question too.
This essay will introduce the heat-resistance of stainless steel containers, some precaution tips when heating/warming the contents by using stainless steel containers, and frequently asked questions about heating process from our customers.

Contents

・The heat-resistant temperature of stainless steel container
・Precautions when heating the contents by using a stainless steel container
・Frequently asked questions about heating with stainless steel containers

The Heat-resistant temperature of stainless steel container

The heat resistance temperature depends on the type of stainless steel.
The heat resistant temperature of SUS 304 (18 -8) stainless steel, which is mainly used in our company stainless steel containers, is around 700 °C to 800 °C. However, when the temperature exceeds 300 °C, the product comes to a baked color (temper color).

Our company’s stainless steel containers are made of thin plates, and at high temperatures, the body material will not only be burnt to baked color but also distort, making them difficult to use. Therefore, we have set the heat-resistant temperature to about 300 °C. (Cold-resistant temperature: -273 °C)

*The color of the burnt (baked) color depends on the material, temperature, surface condition, etc.
*For information on the heat-resistance of other companies’ products, please contact the manufacturer of the product.

Be careful of the heat resistance temperature of the accessories.

For example, in the case of a stainless steel container with a gasket, even if the heat resistance temperature of the stainless steel is OK, the gasket may be unbearable at such a temperature.
If there are accessories other than stainless steel such as gasket, please check the heat resistance of the accessories in advance.

Stainless steel won't cool down easily once it is warmed up.

Stainless steel (SUS 304) is inferior in thermal conductivity to aluminum and copper, and it takes time to warm up. However, it has excellent heat retaining properties (heat storage properties) and does not cool easily once heated. In addition, stainless steel containers are chosen for processes involving temperature control because stainless steel does not rust and can be used hygienically for a long time.

Precautions when heating the contents by using a stainless steel container

Do Not heat in an empty pot or in a sealed condition.

Heating without content can cause fire. In addition, if the product is heated while sealed, the internal pressure will increase, causing unexpected accidents such as explosions and injuries.
When using an airtight container with a clip or lever ring, remove the clip or band and heat in an open state.

Take measures against burn injuries

The surface of the heated stainless steel container is also very hot, and easily get burned if touch by mistake. To prevent burns, we recommend you wrap a protective cover called a “thermal insulation cover” around the outer surface of the container to insulate it, or to use a standard stainless container with a thermal insulation tank.

Temperature rise speed varies with ambient temperature

For stainless steel containers, such as those with heaters, it is important to know how long it takes to raise the temperature.
Of course, it is necessary to select the appropriate equipment, but if the ambient temperature of the installation site is low, the speed of temperature rise will be slow because heat is lost, and if there is heat radiation from the stainless steel container, the ambient temperature will rise.
In order to reduce the influence of the ambient temperature and the influence on the ambient temperature, it is effective to insulate as described above in order to prevent burns.

Frequently asked questions about heating with stainless steel containers

Can a stainless steel container be heated with a gas stove or IH?

Stainless steel containers (especially those shaped like cylindrical pots) made in our company are made of thin stainless steel plates for storage use.
Therefore, the container may deform or change color when heated on a gas stove.
Heating itself is possible as long as it is not empty or sealed, but deformation and discoloration by heating are not covered by the warranty.
IH can be used only for all metal-compatible products, but please contact the IH manufacturer to confirm the compatibility in advance.

How should I heat the contents that burn easily?

Stir the contents while warming to prevent irregularities in the temperature, or use a method like hot-water bath to prevent them from burning.

After heating, I closed the lid of the container and stored it, and then the lid became unable to open...

If the temperature inside the container is cooler than when the lid is closed, the inside of the container will be reduced in pressure and the lid will not open. The lid can be opened by removing the pressure difference between the inside and outside of the container. Please see the next column for specific instructions.

Can stainless steel products be sterilized?

Stainless steel itself can be sterilized, but some stainless steel products can and cannot be sterilized.
Please refer to this page for details.