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 Sumitomo Metal Ind., Ltd. (SMI) have jointly developed new duplex stainless steel DP28W for urea plant in 2004 with the remarkable corrosion resistance.

Duplex SS Application to Urea Plant
1970s 25Cr-5Ni-2Mo
MP Decomposer and HP Carbamate Pump
1980s 25Cr-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.

1.
Excellent corrosion resistance
  • Improves reliability and maintainability
  • Less maintenance cost
  • Prolong life of equipment and plant
2.
Excellent passivation property
  • Less passivation air injection
  • Improves safety and operability
3.
High mechanical strength
  • Reduce thickness & weight of pressure parts
  • Reduce required surface area of tubes
Feature of DP28W

High Corrosion Resistance -Corrosion Rate of Base Metal-

Feature of DP28W

High Corrosion Resistance -Corrosion Rate of Weldment-

Feature of DP28W

High Mechanical Strength -Comparison of Strength for Each Metal -

  Tensile Strength
(MPa)		 Yield Strength
(MPa)		 Elongation
(%)		 Hardness
(Hv)
DP28W 934 647 42 281
DP12 822 610 42 251
25Cr-22Ni-2Mo 676 352 50 173
316L 518 234 52 144

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※ DP28W is a trademark of Toyo Engineering Corporation and Sumitomo Metal Industries Limited.
Copyright(C) 1994-2009 Toyo Engineering Corporation All rights reserved.

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