Heat treatment method for precipitation-hardening ultrahigh-strength steel mechanical sample

The invention provides a heat treatment method for precipitation hardening of an ultrahigh-strength steel mechanical sample, which comprises the following steps: S1, orderly putting sample workpieces into a material frame, and putting the material frame and the sample workpieces into a heat treatment furnace for heating; s2, the material frame and the sample workpiece are heated to 885 +/-10 DEG C, and the heat preservation time is 1 h +/-10 min; s3, the material frame and the sample workpiece are discharged out of the furnace for quenching, the transfer time before quenching is 20 +/-5 s, and the quenching medium is industrial quenching oil; s4, the quenched sample workpiece is put into a cold treatment box, the temperature is reduced to-73 +/-5 DEG C, heat preservation is conducted for 1 h or longer, and then the sample workpiece is discharged out of the furnace and put into air to be recovered to the room temperature; and S5, the sample workpiece is put into a heat treatment furnace to be tempered, the tem