しかし、表面より約５ｍｍの硬化層境界付近に製鋼時の非金属介在物と思われ

しかし、表面より約５ｍｍの硬化層境界付近に製鋼時の非金属介在物と思われる内部欠陥がみられました

Results (English) 1:

However, there was internal defects in surface hardened edge of about 5 mm and non-metallic inclusions in steel seems to be

Results (English) 2:

However, internal defects we think that the non-metallic inclusions at the time of steelmaking in the vicinity of the hardened layer boundary of about 5mm from the surface was seen

Results (English) 3:

However, from the surface of the internal defects and inclusions in the hardened layer near the boundary of about 5 mm during steelmaking was