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Why is 904L stainless steel so widely used in corrosive environments?
Release time:
2026-06-02
I. Core Advantages (One-sentence summary: High corrosion resistance + Easy to process + Long service life )
- Composition (00Cr20Ni25Mo4.5Cu) ： Ultra-low carbon (C≤0.02%), High-chromium nickel 、 High molybdenum + copper , corrosion resistance far exceeds that of 316L 。
- Extremely acid-resistant : Resistant below 70℃ All-concentration dilute sulfuric acid ; Atmospheric pressure resistance Acetic acid / formic acid of any concentration ; Fully resistant to phosphoric acid at concentrations below 85%.
- Resistance to localized corrosion :PREN≈ 35 (316L≈26), Pitting corrosion / Crevice corrosion Excellent; resistant Chloride-ion stress corrosion (No cracks after 1000 hours in boiling CaCl₂.)
- Worry-free welding : Ultra-low carbon, post-welding No intergranular corrosion , no heat treatment required.
- Tough and easy to machine : Tensile strength ≥ 490MPa , elongation ≥ 35% , easy to form and easy to weld.
II. Typical Application Scenarios
✅ Chemical / Petrochemical : Sulfuric acid/phosphoric acid reactors, storage tanks, heat exchangers, and piping; chlor-alkali pumps and valves; coal chemical equipment 。
✅
Flue Gas Desulfurization (FGD) : Power plant absorption towers, spray pipes, flue ducts, and slurry pumps (resistant to SO₂/Cl⁻)
。
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Ocean / Desalination : Seawater coolers, desalination pipelines, platform water supply and drainage systems, and ship ballast tanks (high chlorine resistance).
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Pharmaceuticals / Food : Acetic acid / citric acid fermentation tanks, sterile piping, and centrifuges (hygienic-grade, resistant to organic acids).
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Oil and Gas / New Energy : Casing for sulfur-containing oil and gas wells, lithium‑battery electrolyte tubing, and electroplating pickling tanks.
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High-end manufacturing : Watches (such as Rolex), medical implants, and fasteners for highly corrosive environments.
III. Key Considerations for Selection
- ✅ Applicable to: Dilute sulfuric acid, phosphoric acid, organic acids, seawater / high-chloride environments, flue gas desulfurization Under harsh operating conditions.
- ❌ Use with caution: Concentrated nitric acid, concentrated hydrochloric acid (>2%) (Molybdenum accelerates corrosion.)
- Cost: approximately 316L of 3–5 times , but Long lifespan, low maintenance , more cost-effective across the entire lifecycle.
IV. One-Sentence Summary
904L is the “all‑round champion of corrosion resistance” in dilute acid and high‑chloride environments. , the top choice for chemical processing, desulfurization, and offshore engineering—an upgraded, premium alternative to 316L.
TSINGHANG NEW MATERIAL
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