The performance differences between 3Cr-H13 steel (with Chromium content reduced to 3%) and traditional H13 steel (with 5% Cr content) were compared. Microstructural and phase composition analyses were conducted using SEM, TEM, and XRD to investigate the influence of Chromium on the properties of H13 steel.

The results indicate that reducing Cr content significantly improves the tempering stability and high-temperature strength of H13 steel. This improvement is primarily attributed to the degree of martensite recovery in the tempered structure and the specific types of secondary carbide precipitation.Traditional H13 Steel: When tempered at 650°C, the martensite undergoes nearly complete recovery, leading to a significant drop in matrix strength. Large quantities of near-spherical Cr7C3 and M6C carbides precipitate along the original martensitic lath and grain boundaries, weakening the secondary phase hardening effect.3Cr-H13 Steel: After tempering at 650°C, the matrix retains its lath martensite structure with a high dislocation density. Simultaneously, a large volume of fine, dispersed, short-rod-shaped VC (Vanadium Carbides) precipitates within the laths. These carbides provide dispersion strengthening and pin the dislocations, delaying martensite recovery and thereby enhancing high-temperature performance.These blades are ideally suited for hot shearing of medium-to-thick plates and billets in steel mills.

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