Brittleness that is sometimes found in steel at temperatures typically between about 200 and 350°C (high enough for a film of blue oxide to form on the surface).
Origin
Early 20th century.
Definition of blue brittleness in US English:
blue brittleness
noun
Metallurgy
Brittleness that is sometimes found in steel at temperatures typically between about 200 and 350°C (high enough for a film of blue oxide to form on the surface).