What does 304 stainless steel, 304L stainless steel and 304H stainless steel mean?
What does 304 stainless steel, 304L stainless steel and 304H stainless steel mean? 2019-11-04 The editor of today's 304 stainless steel pipe manufacturer would like to briefly summarize for everyone: the difference between 304 stainless steel pipe, 304L stainless steel pipe and 304H stainless steel pipe, I hope it can be helpful to everyone. What is the difference between 304, 304H and 304L? In fact, according to the content of chromium and nickel, they are all 304 stainless steel. The composition contains 18% chromium (Cr) and 8% nickel (Ni), but the main difference is that it contains The amount of carbon is different. 304, 304L, 304H chemical composition (%) table 304L is a low-carbon stainless steel, the carbon content is reduced to 0.03% or less, can avoid intergranular corrosion, and theoretically anti-stress corrosion effect is stronger than 304, but in practical applications The effect is not obvious. The purpose of reducing carbon and adding titanium is the same, but the smelting cost of titanium-added 321 is higher, the molten steel is thick, and the price is more expensive. The H in 304H refers to high temperature. High carbon content is the guarantee of high temperature strength. GB150 requires that when austenitic steel is used above 525 degrees, the carbon content is not less than 0.04%. Carbides are strengthening phases, especially high temperature strength. Better than pure austenite. Among the three, the high carbon content is 304H, the low carbon content is 304L, and the carbon content is between the two. It was also shared in 'What is the use of carbon in 304 stainless steel pipes'. 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 causes the price to be different, so the requirements for different uses are also different. 304, 304L, 304H mechanical properties table The above is the relevant knowledge compiled by the editor of 304 stainless steel pipe manufacturers. If you want to know more relevant knowledge, please contact us.