Stainless Steel for Oil, Gas & Petrochemical Projects
Oil and gas orders combine material selection with strict product standards, pressure classes, NDT, marking and documentation. Duplex grades serve chloride and strength-driven duties when fabrication controls are defined.
Corrosion and Failure Mechanisms
- Chloride pitting and stress-corrosion cracking in offshore process systems
- Sour-service cracking where hardness and environmental limits are not controlled
- Galvanic attack or crevice corrosion at piping interfaces
- Loss of duplex phase balance from unsuitable heat input
Common Selection Risks
- Treating grade selection as independent from code, sour-service and impact requirements
- Ordering components to mismatched dimensional or pressure standards
- Omitting the ITP, NDT scope and document index from the RFQ
Recommended Stainless Steel Grades
- 316L Stainless SteelGeneral process piping and low-temperature service
- 321 Stainless SteelSelected elevated-temperature piping
- 2205 Stainless SteelOffshore and chloride-bearing systems
- 2507 Stainless SteelSevere offshore service
- 17-4 PH Stainless SteelHigh-strength valve and mechanical parts
Typical Supply Requirements
| Pipe | ASTM A312/A790 or project specification |
|---|---|
| Fittings | ASTM A403/A815 |
| Flanges | ASTM A182 and ASME dimensional standard |
| QA | PMI, NDT, hydrotest and document index per ITP |
Related Product Forms
Related Standards
Related Surface Guidance
What to Include in Your RFQ
- Provide the material requisition and ITP.
- State sour-service and impact-test requirements.
- Align all piping-class components.
Related Grade Comparisons
Frequently Asked Questions
Why is duplex common offshore?
It combines higher chloride resistance with roughly twice the yield strength of 316L when fabrication is controlled.
What is an ITP?
An inspection and test plan defines tests, hold points, witness points, acceptance criteria and required records.
Can every stainless pipe use the same fittings?
No. Material, dimensions, pressure class and service requirements must match the project piping class.
Technical content updated: 2026-07-29
Organizational author: Tsingshan (Shandong) Iron & Steel Co., Ltd..Review method, status and limitations.
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