Mae adroddiad newydd a gyhoeddir heddiw'n cyfrifo faint o ddur y bydd ei angen ar gyfer prosiectau seilwaith ac adeiladu sector cyhoeddus Cymru rhwng 2017 a 2023.
A new report is published today which calculates how much steel will be needed for Welsh public sector infrastructure and construction projects between 2017 and 2023.