10CrMo9-10 Steel

Steel name: 10CrMo9-10
Diagram No.: 5111
Type of diagram: TTP
DIN designation: 10CrMo9-10
Mat. No. (Wr. Nr.) designation: 1.7380
AISI/SAE designation: A182 F22
AFNOR designation: 12CD910
GOST designation: 12Ch8
BS designation: 622/B3
Chemical composition in weight %: 0.08 - 0.14% C, max. 0.50% Si, 0.40-0.80% Mn, max. 0.020% P, max. 0.010% S, 2.00 - 2.50% Cr, 0.90-1.20% Mo, max. 0.012% N, max. 0.30% Cu
Steel group: Alloy special steels
Note: After cooling in air from 950C the microstructure is bainitic. On tempering above 500 C the cementite of the bainite is dissolved in under 1000 h. In its place, M2X is precipitated in the form of needles, as described above. Later the carbides M2 C6 and M6C are formed, the former predominating at temperatures around 550C and the latter at 600C.
After the usual technical heat treatment 950C 30 min/air + 750C 2 h/air, the cementite has been completely dissolved. Instead the carbides M2X and M23C6 and, in the presence of vanadium as impurity, face-centred MX are formed. In addition, M6C is formed on tempering for long times or at higher temperatures.
After transformation with slow cooling from 950 to 650C in 12 h followed by cooling in air, M2X is found in the microstructure in the form of needles and eutectoid borders. During the subsequent long-time tempering first M23C6 and then M6C is precipitated.
Finally we consider the precipitation behaviour after isothermal transformation (700C 1 h). In the initial condition M2 X, in the form of needles and eutectic borders, and M23C6 are present. During long-time tempering M6C is precipitated as a further carbide phase, whilst M23C6 is dissolved. It may therefore be assumed that in the steel 10CrMo9-10 only M6C and perhaps also M2X occur as stable carbide phases. Cementite (M3C) and the chromium carbides M7C3 and M23C6 occur only as metastable intermediate phases.
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