SUS304溶接継手の高温強度試験(3)及びMod.9Cr-1Mo鋼鍛造材の高温強度試験(1)

Strength tests of SUS304 stainless steel weld joint at elevated temeperature(III) and strength tests of Mod.9Cr-1Mo forging steel at elevated temperature (I)

福田 嘉男*; 福井 寛*; 祐川 正之*; 中川 幸雄*

not registered; not registered; Sukekawa, Masayuki*; not registered

高速原型炉及び大型炉設計に必要な溶接部及び鍛造材のデータを得る目的で、オーステナイト系ステンレス鋼SUS304の溶接継手及びMod.9Cr-1Mo鋼鍛造材の高温強度試験を実施した。溶接継手試験は昨年に引き続きSUS304板材(40t)及びSUS304鍛造材(350t)を母材とする溶接継手を用いた。また、母材試験はMod.9Cr-1Mo鋼(550t)を用いた。SUS304鍛造材と板材の溶接継手についてはクリープ試験、曲げ場クリープ疲労試験を、さらに308全溶接金属についてはクリープ試験を実施した。Mod.9Cr-1Mo鋼鍛造材については、引張試験、クリープ試験及び疲労試験を実施した。これらの試験を実施した結果、以下の結言を得た。(1)308全溶接金属及びSUS304鍛造材-板材の溶接継手のクリープ強度は動燃事業団"高速原型炉高温構造設計指針・材料強度基準等"の許容応力を満足する。(2)SUS304鍛造材-板材の溶接継手の曲げ場クリープ疲労強度は軸応力場でのクリープ疲労試験より500では若干大きく、550ではかなり大きい。(3)Mod.9Cr-1Mo鋼鍛造材の引張、クリープ及び疲労強度は、母材の表面と中央部で有意差はなく動燃事業団"材料強度基準等(暫定値)"を満足する。

Strength tests of SUS304 stainless steel welded joint and Mod.9Cr-1Mo forging base metal at elevated temperature were carried out for the purpose of getting data needed for prototype Fast Breeder Reactor and Demonstration plant. Same as last year's, examined materials were welded joints of SUS304 plate (40t) and SUS304 forging (350t). For base metal test, Mod.9Cr-1Mo forging (550t) were applied. Creep test, bending creep and fatigue test of welded joint of SUS304 plate and SUS304 forging, and creep test of weld metal were carried out. Tensile test, creep test and fatigue test of Mod.9Cr-1Mo forging were carried out. Results of these tests are as follows. (1)308 weld metal and welded joint of 304 plate and forging show that their creep strength are higher than those of Material Strength Standard, PNC. (2)Bending creep fatigue strength of welded joint of plate and forging are a little higher than those strength on axial load at 500C and are a considerable higher than those at 500C. (3)Tensile strength, creep strength and fatigue strength of Mod.9Cr-1Mo forging steel are same as Material Strength Standard, PNC (preliminary). And there are no significant difference between two data of surface and middle of forging.