Actually, it can be easily distinguished just by the spark. In fact, there are other simple methods to tell them apart.Stainless Steel Hexagonal TubeHexagonal Titanium Rods with Stainless Steel:

Check the colors. Titanium is black, and steel is white.

2. After soaking in nitric acid, you'll find that titanium does not react, whereas placing stainless steel in it will cause a strong reaction.

3. Titanium has a density of 4.51, making it lightweight, while stainless steel is quite heavy. A careful distinction is a great way to differentiate between the two. This should be a significant difference.

4. Titanium metal tiles can be marked in gray-black, but not in stainless steel.