Premium 904L stainless steel (1.4539). Superior resistance to sulfuric, acetic & phosphoric acids. Ideal for chemical processing, oil & gas. Request your quote from ZYTC Alloy.
Delivery :
FOB
minimum order :
50 kilograms
Supply Ability :
5000kilograms / Month
Stock Time :
7-10Day
Country of Origin :
CHINA
Quantity :
add to cart
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904L is a high-nickel (23-28%), high-molybdenum (4-5%) super-austenitic stainless steel with copper addition (1-2%), specifically formulated for exceptional resistance to non-oxidizing acids, particularly sulfuric and phosphoric acid. It offers superior resistance to pitting, crevice corrosion, and stress corrosion cracking compared to 304L and 316L, making it the preferred material for chemical processing, acid production, and pollution control equipment operating in aggressive environments .
1. Product Specifications & Physical Data
ZYTC Alloy supplies 904L stainless steel in precision forms for chemical processing and industrial applications requiring verified corrosion resistance.
Available Forms: Instrument tube, precision tube, hydraulic tube, coiled tube (seamless and welded), sheet, plate, bar, and fittings .
Specifications: ASTM B625, ASTM B673, ASTM B674, ASTM B677, EN 10088-2 1.4539, UNS N08904 .
Chemical Composition (Weight %)
904L Stainless Specification
Nickel (Ni)
23.0 - 28.0
Chromium (Cr)
19.0 - 23.0
Molybdenum (Mo)
4.0 - 5.0
Copper (Cu)
1.0 - 2.0
Carbon (C)
0.020 max.
Manganese (Mn)
2.0 max.
Silicon (Si)
1.0 max.
Sulfur (S)
0.035 max.
Nitrogen (N)
0.10 max.
Iron (Fe)
Balance
Physical Properties
Metric
Imperial
Density
7.95 - 8.0 g/cm³
0.287 - 0.289 lb/in³
Melting Point
1300 - 1390°C
2370 - 2535°F
Modulus of Elasticity
190 GPa
27.6 × 10⁶ psi
Thermal Conductivity (RT)
11.5 W/m·K
79.8 BTU·in/hr·ft²·°F
Coefficient of Expansion (20-100°C)
15.3 µm/m·°C
8.5 µin/in·°F
Mechanical Properties (Minimum)
Value
Unit
Tensile Strength
490 MPa
71 ksi
Yield Strength (0.2% offset)
220 MPa
32 ksi
Elongation
35%
35%
Hardness (Brinell)
215 max.
215 max.
Impact Strength (Charpy V, -196°C)
60 J
44 ft·lbf
2. Fabrication & Material Comparison
Heat Treatment: Solution anneal at 1090-1175°C (2000-2150°F), rapid water quench; cannot be hardened by heat treatment .
Hot Working: Forge at 1150-1200°C (2100-2190°F); reheat as necessary; rapid cooling after working recommended .
Cold Working: Good formability; can be readily bent to small radius in cold condition; subsequent annealing not required for most applications, but recommended under severe SCC conditions .
Machining: Good machinability using standard methods; low sulfur content requires careful attention to tooling and feeds .
Welding: Excellent weldability using all conventional methods; no pre-heat or post-weld heat treatment required; 904L filler recommended; caution required for constrained weldments to avoid hot cracking .
Material Comparison:
vs. 316L Stainless: Superior resistance to sulfuric acid; better pitting and crevice corrosion resistance; higher cost justified for severe service .
vs. 254 SMO: Lower molybdenum (4-5% vs. 6-6.5%); 904L offers better sulfuric acid resistance due to copper; 254 SMO better for extreme chloride pitting .
vs. AL-6XN: Lower nickel and molybdenum; 904L selected specifically for non-oxidizing acid service .
vs. Alloy 20: Comparable performance in sulfuric acid; 904L offers better overall corrosion resistance in mixed environments .
3. Applications
Chemical Processing: Reactors, vessels, heat exchangers, piping for sulfuric, phosphoric, and acetic acid service
Acid Production: Equipment for sulfuric and phosphoric acid manufacturing, pickling tanks
Pollution Control: Gas scrubbing equipment, electrostatic precipitators, FGD systems
Seawater Service: Heat exchangers, cooling devices, piping systems
Oil & Gas: Well piping, process equipment for sour service
Contact ZYTC Alloy for certified 904L stainless steel materials with complete traceability, ASTM/EN specifications, technical datasheets, and competitive pricing on standard precision tube sizes or custom-fabricated components.
