Can the steel structure base of petrochemical plants, which is treated to St2 grade, be painted?

I understand the question from the original poster – it’s about whether the steel structure of petrochemical plants can be painted after being rust-removed to St2 grade, right? Here are a few points for reference: St2 corresponds to the rust removal level for manual or power tools; in theory, painting can be carried out at this level. However, petrochemical facilities operate in highly corrosive environments, and the anti-corrosion requirements for such projects are generally higher than those for ordinary steel structures. Many petrochemical projects require a sandblasting rust removal standard of at least Sa2. It is best to first check the project’s design drawings and the owner’s acceptance criteria to confirm the required standards ； Even when using St2-level treatment, it is necessary to thoroughly remove any loose rust, old coatings, and oil stains from the surface, ensuring that rust removal is complete before applying the coating; otherwise, this will affect the adhesion of the coating, leading to problems such as peeling and flaking over time ； Corrosion protection in petrochemical areas also requires a corresponding coating system; it is recommended to choose the appropriate primers and topcoats based on the operating conditions. It is best to consult a specialized corrosion protection engineer for the project in advance to clarify the details, thereby avoiding issues during subsequent inspections.