By RomanMet
Date 03-27-2018 23:09
Edited 03-27-2018 23:43
If the material have cold strain equivalent to 15 % or les, provided the hardness in the strained area does not exceed 190 HBW, this is another consideration to take into account
Hardness min
Must be according to ASTM A106 gr B. But we estimate the value of hardness according to your effort to stress & ASTM 370. this could be estimate the hardness according to Tensile Strength min (60 Ksi) Table 3 Approximate Hardness 123 HB min. The min hardness value is not a requirement but it is a reference value.