How many MT scrap metal can you load in 20 ft container?

It would be helpful to provide the width and height so that the volume can be calculated. TO half answer your question though it'll depend on what you are putting in it because of the possibility of not being able to 'pack' the scrap in well.

Nevada: Well close to 25 metric tonnes can fit in a 20ft container although i have heard of 28mt fitting, but most ports wont ship it because its too heavy and dangerous for the container. I ship scrap metal from trinidad and 25 is the normal target we aim for in a 20ft.