原子炉用高張力鋼溶接継手の高温引張およびクリープ・ラプチャ試験
1963 年 32 巻 8 号 p. 688-697
詳細
1963 年 32 巻 8 号 p. 688-697
High temperature tensile and creep rupture properties of six low alloy high strength steels were investigated for base metals and welded joints which were made with covered electrodes. Test steels were all 30 mm thick, four HT 60 (three normalized and one quenched & tempered) and two HT 70 quenched & tempered steels which were produced experimentally for nuclear pressure vessels.
The results are that:
(1) The high temperature tensile and rupture strengths of welded joints were generally inferior to those of base metals.
(2) The tensile strength of both base metals and welded joints began to decrease at 300°C for quenched & tempered HT 60 and HT 70 steels, and at 350°C for normalized HT 60 steels.
(3) The rupture of tensile specimens of welded joints was generally located in base metal at lower temperatures, and in weld metal at higher temperatures.
(4) Generally, higher creep rupture strengths were observed for steels with higher tensile strengths at high temperatures.
(5) As far as the present test steels are concerned, normalized steels seem to have better high temperature strength than quenched & tempered steels.
