Stainless Steel for Pulp & Paper Processing
Pulp and paper plants combine chlorides, oxidizing bleach chemicals, reducing liquors, deposits, abrasion and temperature. Material selection changes by process stage, and final approval requires the mill chemistry and project corrosion review.
Corrosion and Failure Mechanisms
- Pitting and crevice corrosion in chloride-bearing white water and bleach service
- General or localized attack in reducing and oxidizing process liquors
- Stress-corrosion cracking in hot chloride zones
- Erosion-corrosion and under-deposit attack in high-solids flow
Common Selection Risks
- Applying one grade across digesting, bleaching, recovery and wet-end systems
- Ignoring residual oxidants, shutdown washing and deposit chemistry
- Selecting alloy without weld, cleaning and contamination controls
Recommended Stainless Steel Grades
- 316L Stainless SteelGeneral mill piping and moderate process service
- 317L Stainless SteelAdditional molybdenum for selected chemical zones
- 2205 Stainless SteelHigher-strength chloride and liquor service
- 2507 Stainless SteelSevere chloride and oxidizing zones
- 254 SMO Stainless SteelAggressive bleach and high-chloride duties
Typical Supply Requirements
| Stage | Exact mill process and chemical stream |
|---|---|
| Chemistry | Normal, cleaning and upset concentrations |
| Mechanics | Solids, velocity, abrasion and design stress |
| Fabrication | Weld procedure, finish, passivation and inspection |
Related Product Forms
Related Standards
Related Surface Guidance
What to Include in Your RFQ
- Identify the precise process stage.
- Provide normal and upset chemistry.
- State solids, flow and cleaning conditions.
Related Grade Comparisons
Frequently Asked Questions
Is 316L suitable throughout a pulp mill?
No. It serves many general areas, but bleach chemicals, hot chlorides, reducing liquors and deposit-prone zones can require different alloys.
Why use duplex stainless in mill equipment?
Duplex grades add strength and chloride resistance, which can suit vessels and piping when welding and phase balance are controlled.
What process data belongs in the RFQ?
Name the process stage, chemicals and concentrations, temperature, solids, velocity, cleaning cycle, shutdown condition and design code.
Technical content updated: 2026-07-29
Organizational author: Tsingshan (Shandong) Iron & Steel Co., Ltd..Review method, status and limitations.
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