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For exploring the corrosion rules of copper-containing low carbon steel under different pH conditions，the electrochemical workstation and metallographic microscope were used to analyze the polarization curves，AC impedance spectra and micro morphologies of ordinary weathering steel (Q345)，copper-containing low carbon steel (0Cu3Cr) and hull copper-containing low carbon steel (0CuAl) in NaCl environments with different pH values.Additionally，the difference in corrosion performance between copper-containing steel and low carbon steel in NaCl environments with different pH values was observed.Results showed the self-corrosion potential of the three samples was higher in the NaCl environment with pH＝12.The corrosion processes of 0Cu3Cr and 0CuAl were controlled by the anodic dissolution reaction，while that of Q345 was controlled by the cathodic reaction.Moreover，the self-corrosion potential of Q345 and 0Cu3Cr at pH ＝6 was slightly greater than that at pH＝8.The charge transfer resistance values of the three kinds of samples were the largest in the NaCl environment with pH＝12.When pH＝6，the pitting pits on the surface of 0Cu3Cr were smaller and less numerous.When pH＝8，the pitting pits on the surface were larger and more numerous.Besides，the corrosion resistance of 0CuAl at pH＝8 was better than that at pH＝6.

In the present work, the hot deformation behavior of two austenitic stainless steels with different nitrogen is studied by conducting compression tests at the strain rates in the range 0.01–7 s−1 and temperatures in the range 950–1150 °C using a Gleeble thermomechanical simulator. Simultaneously, the constitutive relationship is based on the Arrhenius hyperbolic sine equation and constructs the corresponding thermal processing maps based on dynamic material modeling (DMM).The 23Cr7MnNi2Mo0.93N (0.93 N) steel possesses a higher hot deformation resistance and a higher activation energy of deformation (628.39 kJ mol−1) compared to the 23Cr7MnNi2Mo0.45N (0.45 N) steel (315.79 kJ mol−1). Dynamic recrystallization occurs predominantly in 0.93 N steels under the conditions tested, the samples with 0.93% nitrogen content exhibit higher peak stresses and more complex rheological behavior. According to the thermal processing maps, the hot working region for 0.45 N steel is 1020 to 1150 °C at strain rates of 0.01 to 0.1 s−1, while 0.93 N steel is not suitable for processing in the experimental parameter range. [ABSTRACT FROM AUTHOR]