Changes in hardness scales from HRB to HRC in table 2 are denoted by a superscripted footnote J. Additionally footnote C states that either Brinell or Rockwell B hardness is permitted. As the maximum hardness for many of the grades is actually measure on the Rockwell C scale, we believe the table would be more user friendly if the heading in table 2 was changed from Rockwell B to Rockwell with the maximum value listed also including the appropriate scale (e.g. instead of listing the maximum as 92 in a column labled Rockwell B the column would be headed Rockwell and the value shown as 92 HRB). We would also propose to change footnote C to read Either Brinell or the designated Rockwell scale are permitted. This proposed change would make the requirements of the specification clearer and easier for the user to interpret without changing any of the current requirements.
Keywordschromium; chromium-nickel stainless steel; chromium-manganese-nickel stainless steel; pressure vessels;