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Ferrous Metals:

Low Temperature Steel

Most steels (except austenitic stainless steels) become brittle at temperatures below -10 °C. At the ductile to brittle transition temperature the impact energy can decrease by a factor 10. Steels containing Ni have a lower ductile to brittle transition temperature. The embrittlement temperature decreases with increasing Ni%. Applicable to very low temperatures. Mechanical properties increase with increasing Carbon concentration.

Source

Idemat 2003