The application provides a steel seamless
pressure vessel quenching medium concentration determination method, comprising the following steps: S1,
processing multiple end-
quenching samples; S2, configuring multiple groups of water-based
quenching agent solutions; S3, heating and heat-insulating the end-quenching samples, and contacting the test end face of the end-quenching samples with the water-based quenching agent solutions; S4,
processing a detection face on the end-quenching samples, and measuring the
hardness; S5, drawing a relationship curve between the distance from the test end face and the
hardness value at the corresponding position, and obtaining the distance L of the
hardness detection point corresponding to the hardness inflection point from the test end face; S6, drawing a relationship diagram of L and the water-based quenching agent solution concentration; and S7, based on the relationship diagram of S6, determining the water-based quenching agent concentration K during heat treatment quenching cooling of the
pressure vessel with a nominal wall thickness H. The application solves the problems of multiple large furnace test times and inapplicability to different nominal wall thicknesses in the prior art, can quickly and effectively determine the quenching medium concentration, and effectively improves the safety and reliability of the
pressure vessel use.