5Cr-0.5Mo Steel

Steel name: 5Cr-0.5Mo
Diagram No.: 5142
Type of diagram: CCT
Chemical composition in weight %:
.25Cr-0.5Mo steel: 0.69-0.75% C, 0.40-0.50% Si, 0.69-0.50% Mn, 3.00-3.50% Cr, 0.45-0.55% Mo, 0.04-0.08% V
Cr-0.5Mo steel: 0.79-0.85% C, 0.40-0.50% Si, 0.40-0.50% Mn, 4.75-5.25% Cr, 0.45-0.55% Mo, 0.04-0.08% V
Steel group: Cold work tool steels
Note: Final heat treatment is a hardening and tempering operation that establish the roll body surface hardness, depth of hardness, microstructure, and residual stress pattern. This is accomplished by using either a conventional gas fired furnace or an induction furnace. In either case, the hardening heat treatment involves heating the roll surface and sub-surface, depending on the depth of hardness, above the lower critical temperature, followed by a severe water quench. A cryogenic treatment can then be utilized to convert unstable retained austenite to martensite.
The resulting microstructure in the working zone of the roll body will be martensitic due to the hardenability of the roll material and the quench severity as seen in Figure 1. Though the 5% Cr analysis does suppress the bainite nose compared to the 3.25%C r, with a severe water quench, the difference in depth of hardness achieved in the working zone of the roll between the two grades is negligible. All four of these work roll grades have sufficient alloying to provide a martensitic working zone at the surface of the roll provided that the heat treatment variables are adequately controlled. In addition, all four grades will provide carbides in the martensitic matrix to increase the wear characteristics of the roll. However, with increasing chromium content the chemical composition of the carbides change with a concomitant change in hardness.
Reference: Not shown in this demo version.

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