CP800 Steel

Steel name: CP800
Diagram No.: 5008
Type of diagram: CCT
Chemical composition in weight %: 0.14% C, 0.19% Si, 2.21% Mn, 0.063% P, 0.27% Cr, 0.023% Nb
Steel group: Complex phase steels
Note: Austenitizing temperature: 850 C/60 sec. The resulting microstructure after cooling with the lowest cooling rate of 0,6 K/s consists of ferrite (59%), bainite/TM (30%), retained austenite (6%) and some pearlite. With a cooling rate of 20 K/s the microstructure is composed of 42% ferrite, 40% bainite/TM, 13% martensite, 5% retained austenite and no pearlite. The amount of ferrite decreases to 30% as for a cooling rate of 120 K/s. This is balanced by a higher fraction of bainite. Cooling with high cooling rates makes tempered martensite appear rather than bainite. This is also evidenced by the CCT diagram shown in Fig. Rapid cooling impedes ferrite formation and carbon enrichment of the remaining austenite. The decreased austenite hardenability (due to its low carbon content) and the absence of adequate time for the necessary diffusions of carbon during cooling, both resulting in a high Ms-temperature, provoke the formation of autotempered martensite.
Reference: Not shown in this demo version.

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