Requirements for Stainless Steel Performance in Petrochemical Reaction Units
Date:2025-10-22
When selecting stainless steel pipe for petrochemical plants, the following considerations are crucial
1. The concentration and temperature of corrosive media such as H₂S, Cl⁻, and COOH (carboxylic acid) are the primary factors in material selection. For example, Cl⁻ environments are the number one cause of stress corrosion cracking in austenitic stainless steel.
2. Temperature and pressure determine the required strength grade of the material (e.g., whether to select H-grade stainless steel), as well as the material's heat resistance.
3. Processing and manufacturing processes: Weldability is crucial. For example, when welding duplex stainless steel, strict control of heat input and interpass temperature is required to ensure a balanced phase ratio and good performance in the welded joint. The choice of cold working and heat treatment also significantly affects the material's corrosion resistance.
4. Standards and specifications: Steel must comply with industry specifications and international standards (e.g., ASTM, NACE MR0175/ISO 15156).
