Nantong,
As per the MTC supplied by the mill are concerned, Y.S of SS400 are ranging from 300 - 315N/mm2. However for the Chinese Std. of Q345B, the Y.S are ranging from 350 - 440N/mm2. In this case, SS400 are to be classified as Mild strength and it's not the equivalent of Q345B? What would be the equivalent of Q345B to Japanese Std.