1.4466 (AISI 310MoLN / UNS S31050) is a fully austenitic stainless steel specifically engineered for the most demanding chemical environments, particularly urea production. Its optimized chemical composition—high chromium, nickel, molybdenum, and nitrogen—delivers exceptional corrosion resistance in urea carbamate environments while maintaining excellent weldability and structural stability.
Material Standards| Item | Value |
|---|
| Material No. | 1.4466 | | EN Designation | X1CrNiMoN25-22-2 | | AISI/SAE | 310 MoLN | | UNS | S31050 |
Chemical Composition (wt%)| Element | Content (%) |
|---|
| C | ≤0.020 | | Si | ≤0.70 | | Mn | ≤2.00 | | P | ≤0.025 | | S | ≤0.01 | | Cr | 24.0 - 26.0 | | Mo | 2.00 - 2.50 | | Ni | 21.00 - 23.0 | | N | 0.10 - 0.16 |
Mechanical Properties at 20°C| Property | Value |
|---|
| Hardness HB 30 | ≤240 HB | | 0.2% Yield Strength Rp | ≥250 N/mm² | | Tensile Strength Rm | 540-740 N/mm² | | Elongation A5 | ≥35/30 % | | Modulus of Elasticity | 195 kN/mm² |
Physical Properties at 20°C| Property | Value |
|---|
| Density | 7.9 g/cm³ | | Specific Heat Capacity | 500 J/kg K | | Thermal Conductivity | 14 W/m K | | Electrical Resistivity | 0.8 Ω·mm²/m |
Operating Conditions & Selection CriteriaCorrosion Resistance: Urea Carbamate Environments: Excellent resistance in high-pressure strippers and urea synthesis equipment Intergranular Corrosion: Highly resistant after welding due to low carbon and nitrogen stabilization Pitting & Crevice: Good resistance (PREN >33) Stress Corrosion Cracking: Superior resistance compared to 304/316 grades due to higher nickel content
Service Temperature Range: Suitable for continuous operation up to 450°C in corrosive service; mechanical strength maintained to 1100°C for non-corrosive applications . Key Advantages: Fully austenitic – no intermetallic phases Excellent weldability – no preheating or post-weld heat treatment required Good cold formability and polishability
ApplicationsUrea Production: Stripper tubes, carbamate condensers, decomposers, reactor coils, ferrules Chemical Processing: Paper, pharmaceutical, petrochemical, and cellulose industries High-Temperature Equipment: Components requiring corrosion resistance at elevated temperatures
ZYTC Alloy is a leading AS9120B and ISO 9001 dual-certified supplier of high-performance stainless steels and nickel alloys, serving global chemical processing and urea plant manufacturers. Contact ZYTC Alloy Today 📧 Email: daisy@zytcsteel.com
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