ASTM-A550 › Complete Document History
Standard Specification for Ferrocolumbium (Ferroniobium)

Complete Current Edition:
   2016 R21 EDITION - REAPPROVED IN 2021 - March 5, 2021

Obsolete Revision Information:
   2016 EDITION - Standard Specification for Ferrocolumbium (Ferroniobium) - May 15, 2016
   2006 R15 EDITION - REAPPROVED IN 2015 - Nov. 15, 2015
   2006 R10 EDITION - REAPPROVED IN 2010 - Nov. 1, 2010
   2006 EDITION - Standard Specification for Ferrocolumbium (Ferroniobium) - July 1, 2006
   1978 R94(E1) EDITION - EDITORIALLY CORRECTED - Feb. 1, 1995
   1978 EDITION - Standard Specification for Ferrocolumbium (Ferroniobium) - April 28, 1978
   1978 R00 EDITION - REAPPROVED IN 2000 - April 28, 1978