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Grades L80(all tupes),C90,T95 and C110
a) Grades L80(all types),C90,T95,and C110 Through-wall Hardness
The mean hardness numbers ovtained shall comply with the requirements in Table C.5 or Table E.5.In addition,the following shall apply.
1) For L80(all types),any mean hardness number not exceeding 23.0 HRC is acceptable.If any hardness number from a single indentation exceeds 24.0 HRC,the length or piece shall be rejected.
2) For Grades C90 and T95,any mean hardness number not exceeding 25.4 HRC is acceptable.If any hardness number from a single indentation exceeds 27.0 HRC,the length or piece shall be rejected.Products with mean hardness numbers between 25.4 HRC and 27.0HRC shall be retested.
3) For Grade C110,any mean hardness number not exceeding 30.0 HRC is acceptable.If any hardness number from a sigle indentation exceeds 32.0 HRC the length or piece shall be rejected.Products with mean hardness numbers between 30.0 HRC and 32.0 HRC shall be retested.
b) Grades C90,T95,and C110----Surface Hardness (only if required in accordance with 10.6)
For Grades C90 and T95,if the Brinell or Rocjwell C-scale hardness number does not exceed 255 HBW or 25.4 HRC respectivelymthen the length or pirece is acceptable.If any or the hardness numbers are over 255 HBW or 25.4 HRC,two additional indentations may be made in the immediate area.If either of the second test hardness numbers exceeds 255 HBW or 25.4 HRC, the length or piece shall be rejected.
For Grade C110,if the Brinell or Rockwell C-scale hardness number does not exceed 286 HBW or 30 HRC respectively,then the length or piece is acceptable.If any of the hardness numbers are over 286 HBW or 30 HRC two additional indentations may be made in the immediate area. If either of the second test hardness numbers exceeds 286 HBW or 30 HRC the piece shall be rejected.
c) Grades C90 and T95----Alternative Maximum Hardness Requirements
By agreement between the purchaser and manufacturer,the maximum mean hardness numbers may be altered from those stated above,based on slfide stress corrosion cracking tests specified in 7.14.
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