Reference for SS&Alloy Pipe Applications in the Petroleum Industry

Material selection in the oil industry is extremely complex, prioritizing safety over cost-effectiveness. The above recommendations represent general considerations. Specific projects require strict adherence to design specifications and a detailed corrosion assessment. 

1. Corrosive media is the primary consideration 
CO₂ corrosion: 13Cr martensitic stainless steel is the primary choice. For harsh environments, super 13Cr or duplex steel is recommended. 
H₂S corrosion (acid corrosion): Sensitive to sulfide stress corrosion cracking (SSCC), material hardness must be strictly controlled, and duplex steel or nickel-based alloys with improved SSCC resistance should be considered. 

Cl⁻ ions: Highly susceptible to pitting and crevice corrosion. 316L is an entry-level choice, while more demanding environments require steels with higher molybdenum content or duplex steel. 

2. For high-temperature oxidizing/sulfiding environments

Austenitic stainless steels with high chromium or silicon content (such as 310S) are preferred. 

3. Economic considerations

Consider the entire lifecycle cost, while meeting process requirements and safe lifespan. Sometimes, higher-grade materials (such as duplex steel) with a higher initial investment can result in lower overall costs due to reduced maintenance and longer lifespan. 

4. Certification and Standards 
Materials used in the oil and gas industry must comply with strict international and industry standards (such as API 5CT, API 5L, NACE MR0175/ISO 15156, etc.).