Mechanical Properties at Cryogenic Temperature of Improved High Manganese Steel and Their Electron Beam Welded Joint.

This study has been conducted to obtain more improved high manganese steel than A-T and B-T which were investigated in the previous paper.Then, tensile and impact properties at cryogenic temperature of three kinds of high manganese steel, AS (17Mn-12Cr-4.5Si), BV (21Mn-6.3Cr-3.4Si-0.19N) and CT (25Mn-6.5Cr-4.5Si), and their electron beam welded joints were examined by using tensile and instrumented Charpy impact testing apparatus.From the view points of ultimate tensile strength, elongation and total absorbed energy at cryogenic temperature, CT is far better than A-T and B-T, and can be considered as an improved high manganese steel.