- Grade / Alloy
- 310MoLN
- EN / W.Nr.
- 1.4466X1CrNiMoN25-22-2
- AISI / SAE
- —
- UNS
- S31050
- Family
- Austenitic
Chemical composition
Chemical composition
Composition limitsComposition limits for long products within EN 10088-3.
| Element | Content (% by mass) |
|---|---|
| CCarbon | ≤ 0.02 |
| SiSilicon | ≤ 0.7 |
| MnManganese | ≤ 2 |
| PPhosphorus | ≤ 0.025 |
| SSulfur | ≤ 0.01 |
| NNitrogen | 0.1–0.16 |
| CrChromium | 24–26 |
| MoMolybdenum | 2–2.5 |
| NiNickel | 21–23 |
Values describe the grade, not the analysis of a specific batch. The applicable product specification and material certificate determine acceptance. A dash does not mean zero.
What is 1.4466 / 310MoLN?
1.4466 is associated with particular chemical processes rather than general-purpose stainless applications. Equipment used in urea production is a characteristic example. High chromium and nickel contents are accompanied by molybdenum and nitrogen. This combination helps explain its role where metal surfaces contact hot, corrosive process fluids. Its austenitic structure also provides toughness and ductility. The designations 310MoLN and UNS S31050 identify this material.
Its role in urea and fertiliser equipment
Piping, heat exchangers and process vessels occupy different positions within a urea plant. Their common feature is a metal surface that carries the fluid or transfers heat. Media containing ammonium carbamate create corrosion conditions very different from those in an ordinary water line. This explains the close association between 1.4466 and fertiliser production. Applications can involve tubular and flat products as well as connections and mechanical components.
A similar name to 310S, with a different emphasis
The 310 in the name 310MoLN can cause confusion with 310S. The material definitions and principal applications are different. While 310S is familiar in furnaces and hot-gas equipment, 1.4466 is associated with corrosion resistance in chemical service. Resistance to hot air is a prominent theme for one, whereas contact with process fluids is central to the other. Similar numbers therefore do not establish that the grades have the same role.
Its position among specialised corrosion-resistant grades
High-molybdenum stainless steels such as 254 SMO are frequently associated with seawater and chloride-bearing environments. Urea and fertiliser processes are more characteristic of 1.4466. Both approaches concern corrosion resistance, but the alloy balances and familiar service environments differ. Specialised stainless grades do not form a single ranking that applies to every condition. The fluids and equipment associated with a grade explain more than a high-alloy description alone.
Typical application areas
Urea plants, fertiliser equipment and process piping.
Product and cutting options
Relevant product forms for this material are listed below. Availability varies with grade and dimensions.