mõningates terastes esinev haprus peale kuumutamist termperatuurivahemikus 250-375 °C (vt pöördumatu noolutushaprumine; vrd punahaprus)
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Nimetus tuleneb antud temperatuuridel tekkivast oksiidi sinisest värvusest.
brittleness exibited by some steels after being heated to some temperature within the range of about 250 to 375 °C (see: irreversible temper embrittlement; compare: red brittleness)
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Characterized with blue color of oxide.
хрупкость, которая возникает в некоторых сталях после нагрева до температур в промежутке от 250 до 375 °С (ср. красноломкость)
