2 04 0 21 0 07 0 06 bal 1050 u00b0 c u00d7 2 hoqdisk ance 520 u00b0 c u00d7 5 hac 590 u00b0 c u00d7 5__________________________________________________________________________ hac table 5__________________________________________________________________________ impact 10 sup 5 h creepexampletensile 0 2 yield elonga reduction strength rupture strengthkind ofstrength strength tion of area ve sub 20 kgf mm sup 2 steel kgf mm sup 2 kgf mm sup 2 kgf m cm sup 2 450 u00b0 c __________________________________________________________________________1 112 0 79 3 19 8 60 1 8 7 51 12 111 7 79 5 20 1 59 3 8 3 52 33 114 3 81 2 19 5 62 5 7 2 51 34 115 7 82 6 22 3 63 4 8 7 52 75 86 4 26 7 68 8 7 5 35 26 86 8 77 1 26 9 69 1 18 2 237 111 5 20 3 63 5 8 1 55 3__________________________________________________________________________ as can be seen in table 5 the materials 1 to 4 and 7 12 chromium steel of this embodiment exhibited a 450 u00b0 c 10 5 h creep rupture strength of not less than 51 kgf mm 2 and a 20 u00b0 c v notched charpy impact strength of not less than 7 kgf m cm 2 so that it was confirmed that the materials had strength sufficient to be used as the materials for a high temperature gas turbine although the materials low alloy steel to be used as the material for the stubshaft exhibited a low 450 u00b0 c creep rupture strength they showed a tensile strength of not less than 86 kgf mm 2 and a 20 u00b0.