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To improve the impact toughness of the perforating gun pipe, subcritical quenching processes were designed and the influences of process parameters and the initial heat treatments on the mechanical properties of the steel were investigated. The results show that the hardness of the steel with an initial full quenching plus tempering increased at first, reached a highest value and then decreased with the increase of subcritical quenching temperatures. The higher tempered temperatures induced higher impact energy and cross-section reduction rate of the treated specimens and a slightly lower strength. When the initial heat treatments were as-quenched and as-annealed, the specimens subjected to the same subcritical quenching and tempering process had lower impact toughness than that with an initial heat treatment of full quenching plus tempering. The latter had much finer ferrites that separates the martensites maximizely, whilst the other two had large bulk ferrites that are detrimental to the impact toughness.

Subcritical quenching process for toughness improvement of low alloy steel for perforating gun