The performance of stainless steel handles at high temperatures depends on its material, temperature range and exposure time. The following is a detailed analysis:

 

1. Stainless steel type and temperature resistance limit

 

The high temperature resistance of different stainless steels varies greatly:

 

- 304 stainless steel (18% Cr, 8% Ni)

 

- Short-term: It can withstand 800°C (such as sudden high temperature), but it will oxidize and change color.

 

- Long-term: It is recommended to ≤500°C, and the strength will decrease significantly after exceeding it, and it may be deformed.

 

- 316 stainless steel (16%Cr, 10%Ni, 2%Mo)

 

- The temperature resistance is slightly better than 304, and the long-term use is ≤600°C, which is suitable for corrosive environments (such as chemical equipment).

 

- 430 stainless steel (ferrite, 17% Cr)

 

- Temperature resistance ≤400°C, easy oxidation at high temperature, and rapid decline in mechanical properties.

 

- 310S/314 stainless steel (25% Cr, 20% Ni)

 

- Specially designed for high temperature, it can withstand more than 1000°C for a long time (such as industrial furnaces and burners).

 

2. Performance changes at high temperature

 

- Mechanical properties:

 

- At above 300°C, the stainless steel gradually softens and the tensile strength decreases (the strength of 304 decreases by about 50% at 600°C).

 

- Long-term high temperature may cause creep (slow deformation), especially the forced parts (such as heavy door handles).

 

- Surface changes:

 

- Oxidation begins to change color above 200°C (yellow/blue/purple), and a thick oxide layer is formed above 500°C, which affects the beauty but does not necessarily damage.

 

- Corrosion resistance:

 

- High temperature + high humidity/chemical environment (such as salt spray, sulfide) will accelerate pitting or intergranular corrosion, and 316 performs better than 304.

 

- Thermal expansion:

 

- The expansion coefficient of stainless steel wire is high (about 17×10−6/°C), and it may be stuck or loose at high temperatures, and a gap needs to be designed to be reserved.

 

3. Suggestions for applicable scenarios

 

- Home environment (such as oven, fireplace door):

 

- 304 handle is enough (usually <300°C), but it may change color.

 

- Industrial high temperature (drying equipment, boiler):

 

- Choose 310S or nickel-based alloys (such as Inconel) and reinforce the structure.

 

- Corrosive high-temperature environment (coastal, chemical factory):

 

- Priority is given to 316 or surface aluminum/ceramic coating to enhance protection.

 

4. Notes

 

- Avoid sudden cold and sudden heat: thermal shock may cause cracks (especially thick-walled parts).

 

- Regular inspection: Check whether the handle is deformed, loose or corroded after high-temperature use.

 

- Alternative plan:

 

- Ultra-high temperature (>1000°C) can consider ceramic handles or heat-resistant steel (such as 253MA).

 

Sum up

 

304/316 stainless steel handles are suitable for medium and low temperatures (≤600°C), and special alloys are required for high temperatures. If you need to balance beauty and durability, it is recommended to choose 310S or surface heat-resistant treatment.