This standard specifies the grades, chemical composition, etc. of niobium and niobium alloys. This standard applies to various niobium and niobium alloy processing products (including ingots and semi-finished products).
YS/T 656-2015 history
2015YS/T 656-2015 Designation and composition of wrought niobium and niobium alloy
2007YS/T 656-2007 Designation and compostition of wrought niobium and niobium alloy