Stainless steel handles, particularly those made from 316-grade stainless steel, exhibit excellent resistance to brittle fracture at -30°C. The addition of 2–3% molybdenum in 316 steel enhances its stability in low-temperature environments by refining grain structures and suppressing crack propagation. In contrast, 304 stainless steel (18% Cr, 8% Ni) lacks molybdenum, making it more susceptible to low-temperature embrittlement due to reduced ductility and increased susceptibility to stress concentration.

 

At -30°C, materials undergo a brittle-to-ductile transition, where impact toughness decreases significantly. Stainless steel handles must pass Charpy V-notch impact tests (e.g., ≥27J at -60°C for structural steels like Q355NF). For stainless steel, the ductile fracture mode is retained in 316-grade even at extreme temperatures, while 304 may show microcracks under mechanical stress.

 

The GB/T 22888-2021 standard specifies methods for evaluating low-temperature brittleness in surface coatings, which aligns with testing protocols for metal components like handles.

Critical parameters include:

Fracture toughness: 316 stainless steel maintains higher fracture resistance due to its austenitic structure.

Thermal cycling stability: Repeated exposure to -30°C does not degrade 316’s mechanical properties.

 

D handle: Optimal for freezer doors or industrial cold storage, where 316’s corrosion resistance and low-temperature ductility prevent handle failure.

stainless steel door handle: Suitable for exterior doors in polar regions, ensuring reliable operation without brittleness.

glass shower door handle and bathroom glass door handle: Even in cold climates, 316 stainless steel resists chloride-induced stress corrosion cracking (common in humid environments).