21/4 Cr-1Mo 鋼の焼入・焼もどし特性について

概要

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An investigation was conducted to obtain the increased strength of 21/4 Cr-1 Mo steel by quenching and tempering, and were also determined the notch toughness such as Charpy V impact properties and the elevated temperature properties such as stress rupture strength of quenched and tempered 21/4 Cr-1 Mo steel which exhibits room temperature tensile strength of about 80kg/mm^2 (equivalent to the requirement of ASTM A 542 class 1 or of ASME Code Case 1414). The results obtained were as follows : (1) When the cooling rate from austenitizing temperature is less than 10℃/min, tensile strength, yield strength and Charpy V impact values at 10℃ decrease rapidly. Tempering in the temperature range from 600 to 650℃ decreases tensile strength and yield strength, and increases Charpy V impact values at 20℃. (2) The cooling rate from austenitizing temperature should be kept more than 10℃/min and the tempering temperature range should be taken from 615 to 660℃ to meet the minimum tensile properties specified by ASTM A 542 class 1. (3) It is expected that the allowable stress values of the quenched and tempered steel up to about 480℃ may become more than 6kg/mm^2 higher than that of the full annealed steel.
社団法人日本鉄鋼協会の論文
1971-06-01