In the as-received condition, the steel presents a magnetic signal, as displayed in Fig. 2. This figure shows two curves of magnetization. One of them is the raw data of M(H). Note that this curve does not reach the saturation due to the paramagnetic contribution of austenite. By taking the linear fit of the last portion of this curve (as indicated in Fig. 2), we can find an equation of a straight line passing through the origin, with the same slope. Such straight line can approximately represent the paramagnetic contribution to M(H). Once this contribution is subtracted from the raw data, we obtain the second curve displayed in Fig. 2, which reaches saturation. Since the as-received material has a small fraction of δ-ferrite, it is plausible to assume that the magnetic signal of the as-received material comes from this phase