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Occurs in the HAZ due to the precipitation of chromium carbides. In the 5500C - 8500C range, the chromium leaches out of the grain and reacts with the carbon to form chromium carbides, due to the chromium having a greater affinity for carbon.

Wrought iron is almost pure iron. It is made from pig iron in a puddling Furnace and has a carbon content of less than 0.08 percent. Carbon and other elements present in pig iron are taken out, leaving almost pure iron.

Steel forgings may be of carbon or alloy steels. Alloy steel forgings are harder and more brittle than low carbon steels.

Useful Formula Carbon Equivalent :CE = C + Mn/6 + (Cr+Mo-V)/5 + (Ni+CU)/15 % Delta Ferrite : % F = 3[Cr - 0.93 Ni -6.7] Heat input :H(KJ/mm) = ( V x 1 x 60 ) / ( V5 x 1000)

Water contains calcium, magnesium, iron, chloride, oxygen, carbonic acid etc in varying degrees, dependant on the water supply from one area to another, causing boiler scale and corrosion.

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