Low carbon 9% nickel steel plates are often used at service temperature cycling from room temperature to cryogenic temperature. It is necessary to study the tensile properties and hardness at different temperatures.

The specimens for Fig-1 are 9% nickel steel plates in double normalized and tempered (NNT) condition made to ASTM A353 with a thickness of 3/8 inch. The test-temperature range is from -320°F [-196°C] to room temperature [75°F]. The hardness-temperature curve, tensile strength-temperature curve, yield strength-temperature curve, and elongation- temperature curve are plotted in Fig-1.

The specimens for Fig-1 are 9% nickel steel plates in quenched and tempered (QT) condition made to ASTM A553 Type I. The test pieces are furnished in two thicknesses: 3/4″ and 3/8″, respectively. The test-temperature range is also from -320°F [-196°C] to room temperature [75°F]. The hardness-temperature curve, tensile strength-temperature curve, yield strength-temperature curve, and elongation- temperature curve are plotted in Fig-2.