904L Stainless Steel Plate
904L Stainless Steel Plate is a high-alloy austenitic stainless steel renowned for its exceptional resistance to corrosion, particularly in acidic and chloride-rich environments. Composed of nickel (25%), chromium (20%), and molybdenum (4.5%), this stainless steel plate offers unparalleled durability and performance in industries such as chemical processing, marine, and power generation. Its high content of alloying elements provides superior resistance to pitting, crevice corrosion, and stress corrosion cracking.
- Product Introduction
904L stainless steel plates are not merely corrosion-resistant-they're chemical warfare specialists. With a rare 23% nickel, 4.5% molybdenum, and 1.6% copper, this super-austenitic alloy laughs at sulfuric acid, seawater pitting, and chloride stress corrosion cracking. Designed to outperform 316L by 5x in salt spray tests, 904L plates are the clandestine heroes of offshore oil platforms, pharmaceutical reactors, and uranium processing plants.
Why 904L Dominates Extreme Environments
| Threat | 904L Plate | 316L | 6% Mo Alloys |
|---|---|---|---|
| Sulfuric Acid (50%) | Safe up to 40°C | Fails at 25°C | Safe up to 35°C |
| Chloride Pitting Temp | 60°C (ASTM G48 Method A) | 25°C | 45°C |
| Cost per Ton | $18.500 | $5.800 | $22.000 |
Key Specifications
Composition: 20% Cr / 23% Ni / 4.5% Mo / 1.6% Cu (UNS N08904 compliant)
PREN Value: 36+ (vs. 28 for 316L) due to Mo-Cu synergy
Surface Finishes: 2B mill, electropolished (Ra ≤0.1 µm for FDA/GMP compliance)
Industry-Specific Dominance
1. Chemical & Petrochemical
Sulfuric acid concentrators | Phosphoric acid evaporators | Chlorine dioxide reactors
2. Offshore & Marine
Seawater piping systems | Subsea valve bodies | LNG heat exchanger plates
3. Nuclear & Energy
Uranium enrichment centrifuges | Geothermal brine condensers | Flue gas scrubber liners
4. Pharmaceutical
High-purity API reactors | Vaccine purification columns | CIP (Clean-in-Place) system manifolds
Fabrication Mastery
Welding Protocol:
Filler Metals: ER385 or NIMO-Cr27Mo7Cu3 for critical welds | Strict interpass temp <100°C
Gas Shielding: 98% Ar + 2% N₂ for TIG welding to prevent sigma phase formation
Machining Tips:
Use carbide tools with 10° positive rake | Lubricate with chlorinated-free oils
Post-Treatment:
Electrolytic pickling (HNO₃ + HF) to restore passive layer | Passivation per ASTM A967
Global Proof of Unyielding Performance
Shell Offshore: "904L plates in seawater pumps showed zero pitting after 10 years in 35.000 ppm chlorides."
Pfarma Global: "CIP manifolds passed 1.000+ sterilization cycles with no intergranular attack."
Chilean Copper Mine: "904L acid leaching tanks outlasted 317L by 300% in 30% H₂SO₄ at 50°C."
Hot Tags: 904l stainless steel plate, China 904l stainless steel plate manufacturers, suppliers, factory, 316l Stainless Steel Coil, 904L stainless steel sheet, 309S Stainless Steel Plate, inconel 718 tubing, 904L stainless steel tube, 316 Cold Drawn Stainless Steel Pipe
