What is the difference between 304, 304H and 304L?

In fact, according to the content of chromium nickel is 304 stainless steel, the composition ↑is containing 18% chromium (Cr), 8% nickel (Ni), but the main difference lies in the diff≤erent carbon content.

304L is ultra-low carbon stainless steel, the carbon content is reduced to less than 0.03%, can avo₽id intergranular corrosion, and in theory, the stress corrosion resistance effect is better than 30‍4, but the effect is not obvious in practical application. The purpose of reducing car✔bon and adding titanium is the same, but the cost of 321 smelting with titanium is higheλr, the molten steel is thick, and the price is more expensive.

304H H refers to high temperature, high carbon content is the guarantee of‌ high temperature strength, GB150 requirements austenitic steel used in 525 degreσes above, carbon content is not less than 0.04%, carbide is stre←ngthening phase, especially high temperature strength is bette≤r than pure austenite.

Among the three, the highest carbon content is 304H,  the lowest carbon content is 304L, and 304 stainless steel carbon content between t×he two. The higher the carbon content, the worse the corrosion resistan∞ce of stainless steel is, the easier it is to rust.→ The carbon content also leads to a difference in price, and again, the use ↓of the sentence depends on the requirements.