Method for detecting hydrogen content in steel

The invention discloses a method for detecting the hydrogen content in steel, which comprises the following steps: step 1, sample treatment: selecting a sample, cutting the sample to phi 21.5-22.5 mm by using a cooling liquid to form a cutting piece, and weighing the cutting piece to obtain a mass value; 2, heating and collecting are conducted, specifically, the cut part is placed in a quartz tube, the quartz tube is heated and gradually heated at the speed of 3-8 DEG C/min, carrier gas is introduced every 5 min in the heating process for purging, and gas obtained through purging is collected into a corresponding gas collecting cavity; 3, separation and detection: introducing the nitrogen-hydrogen mixed gas in each gas collection cavity into a gas chromatographic column, and then introducing the nitrogen-hydrogen mixed gas into a thermal conductivity detector for analysis; and step 4, data processing: obtaining the concentration value of hydrogen released from each gas collection cavity through a thermal cond