FIELD: transport.
SUBSTANCE: invention relates to railway transport. Proposed method comprises hardening the part with two sidewalls, top and bottom flanges in lateral section. Part hardening is performed by varying thickness of a part of sidewalls δ2≥1.1δ1 at the distance of ℓ≥0.2H from bottom flange where δ1 is initial thickness of each sidewall and H is their height.
EFFECT: increase in maximum life of truck parts.
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