Fatigue tests under direct stress of killed steel, austenite stainless steel and high-strength steel were carried out at room temperature, -55°C and -195°C. The endurance limits and the fatigue reduction factor for notched specimens increase with a decreasing testing temperature. Very sharply notched specimens of killed steel and high-strength steel have also at low temperature such as -55°C two types of endurance limits relating the occurrence of fine non-propagating crack at the root of notch, whilst in the austeinte stainless steel they can not be obtained. A remarkable difference in Charpy impact values between killed steel and austenite stainless steel at low temperature has little influence on the fatigue strength. It can be concluded that the high strength steel quenched and tempered is more advantageous than the steel as rolled concerning the fatigue strength properties of notched specimens at low temperature.
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