Thermal Power Plant (Material Used in Boiler and color code for H.P.Tube material)

Material used for boiler tubes

To improve the properties of iron, suitable elements are added to it such as chromium, Nickel etc to suit the condition of boiler.

            

Alloying elements can be broadly classified in to two groups

a)     Austenite stabilisers :- Which have the effect of extending the temperature rang over which austenite is formed. Such elements are :

            Carbon

            Manganese

            Nickel

            Copper

            Cobalt

b) Ferrite stabilisers :- Which have the effect of extending the temperature range over which alpha & delta ferrite are formed, which consequently reduces temperature range over which austenite is formed. Such elements are :

            Silicon

            chromium

            Molybdenum

            Tungsten

            Titanium and columbium (Niobium)

H.P.Tube Material and color code

1. SA210 - YELLOW
2. SA209 T1 GRADE A1 - RED/SILVER
3. SA213 T11 GRADE A1 - YELLOW/SILVER
4. SA213 T22 GRADE A1 - RED/GREEN
5. SA213 TP 304 - BLUE/GREEN
6. SA 106 GRADE B - RED
7. SA 192 - WHITE
8. SA 213 TP-307 - YELLOW/BLACK