Figure 1: Original Static Seal

Figure 2: (Top) Original seal oxidation layer at 500 °C. (Bottom) Original seal oxidation layer at 850 °C

Figure 3: (Top) NIT50 oxidation layer at 850°C. (Bottom) NIT60 oxidation layer at 850°C

Figure 4: (Top) SS304 oxidation layer at 850°C. (Bottom) SS316 oxidation layer at 850 °C

Spectrum

Element (%wt)

Fe

Cr

Mo

Mn

Spectrum A

95.15

2.6

1.67

0.58

Spectrum B

95.69

2.43

1.07

0.82

Spectrum C

95.40

2.55

1.29

0.76

Average

95.41

2.53

1.34

0.72

Table 1:Semi-qualitative analysis of original static seal material [3]

Temp (C°)

Static Seal (µm)

NIT 50 (µm)

NIT 60 (µm)

SS 304 (µm)

SS 316 (µm)

850

400

3

9

36

30

600

191

<1

<1

<1

<1

500

24

0

0

0

0

Table 2:Oxide layer thickness of different materials at different temperatures