Urea Steel Grade 1.4466 / 310MoLN is a completely austenitic stainless steel grade used in urea production, paper and pulp, and flue gas desulphurization. It has non-magnetic properties and comprises of significant levels of transition metals like chromium and nickel. Moreover, it has low levels of carbon therefore lacks inter-granular carbide precipitations or intermetallic phases. 310MoLN austenitic urea steels are one of the most broadly used grades of stainless steel. Especially, 1.4466 special urea steel has been formulated with an optimized chemical composition. It is designed according to its applications in urea plants. For example, it has nitrogen in its composition which works to stabilize and support its austenitic phase. In addition, it provides enhanced resistance to corrosion in high pressure strippers or urea carbamate environments.
Urea Steel Grade 1.4466 / 310MoLN is a highly alloyed steel grade added with molybdenum and based on 310. However, unlike 310 used for heat resistance, 310MoLN resists corrosion while production of urea. Note the exact composition of the alloy varies between the Euronorm (EN) standards and the standards of American Society of Testing and Materials (ASTM) but an approximated composition is as follow,
- 25% of Chromium
- 22% of Nickel
- 2.0% of Molybdenum
- <0.030% of Carbon
- 0.12% of Nitrogen
Also, the Ferrite levels are kept under 0.5%. All these percentages have been precisely put together to impart quality properties to the steel grade. For example, it provides excellent resistance to pit and fissure corrosion and to ammonium carbamate which is an intermediate in urea production.
1.4466 special urea steel grade serves as the finest example of such alloyed steel and is used for urea production equipment like pipes, fittings, flanges, plates, and forged fittings, etc. It is basically designed for the interior lining of these pieces of equipment because of its high tensile strength and yield strength. The processing of the alloy includes,
- Hot forming
- Cold forming
- Pickling
Hot forming calls for an annealing temperature to obtain the desired microstructure. The austenitic properties of the microstructure allow its easy cold forming followed by pickling and welding. Note that the alloy is sensitive to hot cracking. This is why welding is performed to minimize the ferrite content and carbide precipitations. In order to decrease the susceptibility of hot cracking, basic coated electrodes or fluxes are used.
These graded alloys behave much better than the regular equipment materials therefore they are processed in accordance with high quality specifications. They require special forming techniques with optimal conditions to retain quality properties. Therefore, it is always recommended to obtain such materials from trusted dealers. In such a case, Virgamet is a name of great trust. It is a steel enterprise that deals in quality steel worldwide. They provide products for industrial plants, machining companies, repair and production enterprises, etc. Their credibility, competence, authentic products, professional customer care services, and comprehensive deliveries of supplies are what make them stand out of the crowd. They could be a suitable option if you are looking for one!
