[en] Determined is deformation effect (with degrees of 10, 30, 50 %) before standard heat treatment (hardening from 830 deg C + tempering at 315 deg C + ageing at 95 deg C 48 hrs) on the temperature coefficient of linear expansion α, coercive force, hardness and fine invar structure (the region of coherent scattering and microdistortions). It is found that the degree of deformation considerably affects Hsub(c), HV and substructural invar characteristics, the 10% reduction decreases α in the course of standard heat treatment