The effect of hot rolling process on microstructure evolution, mechanical properties and stress corrosion cracking (SCC) resistance of high-strength low-alloy (HSLA) steels was investigated by varying the finish rolling temperature (FRT) and total rolling reduction. The results revealed granular bainite with large equiaxed grains was obtained by a total rolling reduction of 60% with the FRT of 950 °C (within recrystallization temperature T_r). The larger grain size and much less grain boundaries should account for the relatively lower strength and SCC resistance. A larger rolling reduction of 80% under the same FRT resulted in the formation of massive martensite–austenite (M/A) constituents and resultant low ductility and SCC resistance. In contrast, a good combination of strength, ductility and SCC resistance was obtained via 80% rolling reduction with the FRT of 860 °C (within non-recrystallization temperature T_nr), probably because of the fine grain size and M/A constituents, as well as a high density of grain boundary network.

通过改变终轧温度（FRT）和总压下量，研究了热轧工艺对高强度低合金（HSLA）钢的组织演变，力学性能和抗应力腐蚀开裂（SCC）性能的影响。结果表明，通过在950°F的FRT下（在重结晶温度T _r内）将总压下率降低60％，可以得到具有大等轴晶粒的颗粒贝氏体。）。较大的晶粒尺寸和少得多的晶界应说明相对较低的强度和抗SCC性。在相同的FRT下，更大的轧制率降低80％会导致形成大量的马氏体-奥氏体（M / A）成分，从而导致延展性和耐SCC性降低。相反，可能是由于细晶粒尺寸和M / A成分，通过860°C（在非重结晶温度T _nr内）的FRT进行80％的轧制压下可以获得强度，延展性和抗SCC的良好结合，以及高密度的晶界网络。