From providing the essential nutrients for the growth of our plants and crops to dermataological skin products to the whitening of our smile the fertilizer industry and associated key processes of UREA and ammonia production are an essential ingredient in today’s lives.  

Fertilizer production processes present environments with aggressive corrosion conditions, such as with ammonium carbamate production at 180 ºC (356 ºF) to 250 ºC (482 ºF) and 150 bar (15 MPa). 

With associated processes such as nitric acid, sulphuric acid, phosphoric acid and melamine production more sophisticated solutions to the use of conventional stainless grades such as 304L/316L are required.  

From condensers to cooling towers consideration must be given to the differing types of corrosion presented by the potentially aggressive chemical plant corrosive environments.  

Austenitic

MST designationAttributeNearest equivalent standardTypical chemical composition 1)DensityMin. mechanical prop. at RT
  UNSENJISCmaxCrNiMoCuothers  Rp0.2 Yield StrengthRm Tensile Strength
           g/cm3lb/in3MPaksiMPaksi
DMV 304LCorrosion Resistant S304031.4306SUS 304L0.0319.011.07.90.291702548570
DMV 316LUGCorrosion Resistant S316031.4435 0.0217.013.54.5  8.00.291702548570
DMV 306SiCorrosion Resistant S306001.43610.01518.015.0Si 47.90.292403554078
DMV 4439Corrosion Resistant (S31726)1.4439 0.0317.513.54.5 N 0.168.00.292403555080
DMV 4335Corrosion Resistant S310021.43350.01525.020.5N<0.107.90.292553754078
DMV 25.22.2Corrosion Resistant S310501.4466 0.0225.022.02.0 N 0.127.90.292553754078
DMV 310SCorrosion Resistant S310081.48450.01525.021.07.90.292053051575
DMV 904Corrosion ResistantN089041.4539 0.0220.525.54.51.5 8.00.292153149071

1) All figures in weight percentage. In case of order, the limits of the order specification will apply.

Nickel Based Alloys

MST designationAttributeNearest equivalent standardTypical chemical composition 1)DensityMin. mechanical prop. at RT
  UNSENCmaxCrNiMoCuothers  Rp0.2 Yield StrengthRm Tensile Strength
          g/cm3lb/in3MPaksiMPaksi
DMV 928Corrosion Resistant N080281.45630.0227.031.03.51.2N 0.108.00.292103150073
DMV 931Corrosion Resistant N080311.45620.01527.031.06.51.2N 0.208.10.292804165094
DMV 59Corrosion Resistant N060592.46050.0123.059.016.0Al8.60.3134050690100
DMV C276Corrosion Resistant N102762.48190.0116.057.016.0W8.40.3035051750109

1) All figures in weight percentage. In case of order, the limits of the order specification will apply.

Urea strippers

Carbamate condensers

Tubes: U bent or straight tubes up to 43 m (110 ft) long.

Bimetallic Tubes

Bimetallic tubes were developed as a solution to service some of the most aggressive environments associated with Urea strippers. 

Consisting of an external tube of DMV 25.22.2 and internal tube lining of Zirconium grade 702 we innovated our process technology to ensure the integral bonding during the cold working process.

Bimetallic pipes and process pipework in typical dimensions up to 31 mm (1.22”) OD.