Sandvik 353 MA - oxidation and carburization properties

Due to the high silicon content and the addition of rare earth metals (REM), Sandvik 353 MA* has very high resistance to oxidation. The REM addition also contributes to an improved scale adhesion during temperature cycling.

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Carburization

The ability to form a dense chromium oxide gives Sandvik 353 MA its very good resistance to carburization. Figure 6 shows results from carburization tests performed at the independent National Physics Laboratory (NPL) London. It illustrates how Sandvik 353 MA compares with other high temperature grades.

In the illustrations below, carburization tests at 1050°C (1922ºF) show that in steam cracking tubes for ethylene production, Sandvik 353 MA is better protected from carburization than other common wrought grades. The Cr number below each illustration indicates the remaining free Cr in the metal matrix. Low numbers indicate a high degree of carburization.

Surface of tube
Sandvik 353 MA25 Cr-35 Ni*25 Cr-25 Ni*

Cr=15-18%

Cr=5%

Cr <5%

* Competing material used today

Center of tube
Sandvik 353 MA25 Cr-35 Ni*25 Cr-25 Ni*

Cr=22-25%

Cr=20-22%

Cr <5%

* Competing material used today

Test conditions

Surface of tube
Carburization 120 h
Temperature = 1050ºC (1922ºF)

Total test time 1100 h (8 cycles)

Center of tube
Decoking 20 h
Temperature = 1050ºC(1922ºF)

*353 MA is a trademark owned by Outokumpu OY.