Controlled primarily through hardness limits. The standard typically mandates a maximum weldment hardness of 200 HBW (Brinell) to prevent cracking in wet H2Scap H sub 2 cap S environments.
. This standard provides the critical technical framework for controlling weld hardness in P-No. 1 carbon steels to prevent Hydrogen Stress Cracking (HSC) and Sulfide Stress Cracking (SSC) in downstream refinery operations. nace rp0472 pdf new