オーステナイト系耐熱鋼 (0.1C-2Si-24Cr-13Ni-0.8Mo-0.25N) 用被覆アーク溶接棒の開発
1984 年 70 巻 16 号 p. 2282-2288
詳細
1984 年 70 巻 16 号 p. 2282-2288
Purpose of this study is to develop covered arc-welding electrode for austenitic heat-resisting steel with high nitrogen concentration, 0.1C-2Si-24Cr-13Ni-0.8Mo-0.25N.
In order to prevent hot cracking of weld metal and to keep heat-resisting properties of weld metal equal to those of base metal, covered arc-welding electrode for HK40(0.4C-25Cr-20Ni), which includes less than one percent of Si in all-deposited weld metal, was chosen.
Effects of two kinds of coverings, lime-titania and lime, on blowhole in weld metal, crack-resisting properties of weld metal and creep rupture properties of welded butt joint at 1 000°C were investigated.
A lime-type covered arc-welding electrode which prevented blowhole in weld metal and excelled in crack-resisting properties of weld metal and creep rupture properties of welded butt joint could be successfully developed.
Chemical composition of all-deposited weld metal of this welding electrode is as follows; 0.4C-0.75Si-25Cr-20Ni-0.10V-0.02Nb-0.02Ti-0.04O-0.0005H-0.09N.
Various properties of welded butt joint of the above heat-resisting steel are also described in this article.
