18/8 stainless steel is 18-8 stainless steel, which is composed of iron + 18% chromium + 8% nickel. It can resist chemical oxidation. This stainless steel is No. 304 in the JIS code, so it is also call 304 stainless steel .

As a widely used steel, 304 stainless steel pipe has good corrosion resistance, heat resistance, low temperature strength and mechanical properties.

Because 321 stainless steel contains titanium or niobium elements, its strength and creep properties at high temperatures are better than those of 304 stainless steel.

The introduction of nickel in 304 makes it much more corrosion resistant than 430, but it also makes it more expensive. If cost is more important than service life, 430 may be more suitable.

443 stainless steel increases the chromium content to 21%, and its corrosion resistance is as good as that of 304 stainless steel. Secondly, titanium is added to play a stabilizing role, and it also maintains good corrosion resistance after welding.

304 is an austenitic stainless steel, while 904L is a completely austenitic structure and is insensitive to the precipitation of ferrite and α phase.