《Table 1 Chemical composition of 9%Ni steel (wt%)》

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《深冷处理最低温度对9%Ni钢力学性能及逆转奥氏体含量的影响（英文）》

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Commercially forged 9%Ni steel with a diameter of 150mm was employed for this study.The chemical composition of the selected material is shown in Table 1.The raw material was conventionally normalized and tempered after forging.It was cut into round bars with 13 mm in diameter and 65 mm in length for the tensile tests，and small blocks with the sizes of 10.5 mm×10.5 mm×55 mm for impact toughness tests by electrical discharge machining prior to heat treatment and cryogenic treatment.