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4.4 Forgings
4.4.1 Forgings for the tanks shall satisfy the requirements of NB/T 47008 or NB/T 47010.
4.4.2 The allowable stress values of the forgings shall meet the requirements in Table 4.4.2.
Table 4.4.2 Allowable stress values of forgings
Notes:1 Interpolation may be made for intermediate temperatures.
2 The allowable stress of all high alloy steel forgings only applies to those parts，of which a slight permanent deformation is permitted.