These are low-carbon steels meant for surface hardening (carburizing or carbonitriding) to achieve a hard, wear-resistant surface while maintaining a tough, ductile core.
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Heat treating the steel at high temperatures for an extended period to reduce chemical segregation. uni 8449
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In a technical context, UNI 8449 is also an Italian industrial standard (UNI 8449:1983) used for the classification of banded structures in case-hardening steels . These are low-carbon steels meant for surface hardening
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Banded structures are generally undesirable because they create anisotropy in the mechanical properties of the steel. This means the steel behaves differently depending on the direction of loading. Ensure your German grade calculation documents and English
Varying hardness levels between bands can lead to inconsistent tool wear during machining.
If a component fails in service, examining the banded structure according to UNI 8449 can determine if an unsuitable raw material caused the issue. 5. Mitigation of Banding