What is the difference between Q345 material and 16Mn steel

Q345 material and 16Mn steel are a kind of steel names. Their starting points are different. Q345 material is named from the yield strength of steel, Q stands for yield strength (initial letter of yield), 345 is the value of yield strength, which is 345 Mpa. However, 16Mn steel refers to 0.16% carbon content and 0.7% - 1.0% manganese content.

In addition, the name of 16Mn steel is the old national standard, that is, the former name, because the former national standard has requirements on the manganese content of this material, that is, the manganese content is between 0.7% - 1.0%. However, the new national standard does not require the manganese content of this material, so it does not need to be expressed in 16Mn steel, which is replaced by Q345 material.

Usually, I have friends who ask 16Mn steel, and I will explain to him. Of course, if there are certain requirements for manganese content of Q345 material, I will also screen for customers and try to meet his requirements.