In addition to requiring excellent wear resistance, machinability, heat resistance, and high strength and toughness of thick wall seamless steel pipes, certain seamless steel pipes can decompose into gases such as hydrogen chloride, hydrogen fluoride, and sulfur dioxide in the molten state, so the mold must have a certain degree of corrosion resistance. Currently, domestic seamless steel pipe users generally choose 4Cr13 stainless steel.

In this study, the hardness and microstructure of two types of seamless steel pipe steels after quenching and tempering at different temperatures were studied, and the polishing properties and corrosion resistance of the two steels under service conditions were compared and analyzed. The results show that:

(1) After proper heat treatment, the two types of tested seamless steel pipe steels have relatively high hardness. The quenching and tempering hardness of B steel is higher than that of A steel, but both can meet the requirements of seamless steel pipe molds.

(2) According to the experimental results and the requirements of the mold for the use of materials, the heat treatment process of 1040 ℃ oil quenching+610 ℃ twice tempering is recommended.

(3) The polishing performance of B steel is better than that of A steel in the same state and under the same conditions.

(4) Under the same quenching and tempering process and corrosion conditions, the corrosion resistance of B steel is better than that of A steel, and the average annual corrosion depth is 34.28% lower than that of A steel.