DP28W™: High Grade Material

Summary

Urea Process is well known as one of chemical plant treating corrosive fluid. TOYO is a pioneer to start the application of duplex stainless steel on urea process since 1970’s. TOYO and Nippon Steel & Sumitomo Metal Corporation(NSSMC) have jointly developed new duplex stainless steel DP28W™ for urea plant in 2004 with the remarkable corrosion resistance.

Duplex SS Application to Urea Plant

1970s25Cr-5Ni-2Mo
MP Decomposer and HP Carbamate Pump
1980s25Cr-7Ni-3Mo (DP12)
HP Stripper and HPCC
2004 - 28Cr-8Ni-1Mo-2W (DP28W)
HP Stripper, VSCC, Reactor

Feature

DP28W has following features and the most suitable material for Urea Plant.

  • Excellent corrosion resistance

    • Improves reliability and maintainability
    • Less maintenance cost
    • Prolong life of equipment and plant
  • Excellent passivation property

    • Less passivation air injection
    • Improves safety and operability
  • High mechanical strength

    • Reduce thickness & weight of pressure parts
    • Reduce required surface area of tubes

High Corrosion Resistance -Corrosion Rate of Base Metal-

High Corrosion Resistance -Corrosion Rate of Weldment-

High Mechanical Strength -Comparison of Strength for Each Metal -

 Tensile Strength
(MPa)
Yield Strength
(MPa)
Elongation
(%)
Hardness
(Hv)
DP28W93464742281
DP1282261042251
25Cr-22Ni-2Mo67635250173
316L51823452144
※DP28W is a trademark of Toyo Engineering Corporation and Nippon Steel & Sumitomo Metal Corporation(NSSMC).
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