What is the difference between 304, 304H and 304L? In fact, the content of chromium and nickel are all 304 stainless steel. The composition contains 18% of chromium (Cr) and 8% of nickel (Ni), but the main difference is the difference in carbon content.
304L is ultra-low carbon stainless steel, carbon content dropped below 0.03%, to avoid intergranular corrosion, and in theory the effect of stress corrosion resistance is stronger than 304, but the effect is not obvious in practical applications. The purpose of reducing carbon and adding titanium is the same, but titanium smelting has a higher smelting cost, and the molten steel is thicker and more expensive.
H in 304H refers to high temperature, high carbon content is the guarantee of high temperature strength, GB150 requires that if the austenite steel is used above 525 degrees, the carbon content is not less than 0.04%, and the carbide is the strengthening phase, especially the high temperature strength. Better than pure austenite.
Among them, the highest carbon content is 304H, and the lowest carbon content is 304L. The carbon content of 304 stainless steel is between the two. In the "What is the use of carbon in 304 stainless steel pipe" also shared, the higher the carbon content, the worse the corrosion resistance of stainless steel and the easier it is to rust. The difference in carbon content also leads to a difference in the price, or different requirements for the use of the phrase.
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