What is the difference between 304 and 304H

Model 304 refers to those materials widely used to make wire mesh. These materials contain 18% chromium or 8% nickel (18-8) based on stainless alloys. This material will not rust when placed outdoors and will not be oxidized even if the temperature rises to 1400 degrees Fahrenheit. The 304L model has similar properties to the 304 model. The difference between the two is that the 304L material has better weaving and welding characteristics due to its low carbon content. 304H Features: Stainless heat-resistant steel has good pipe bending and welding process performance, corrosion resistance, high lasting strength and structural stability, and very good cold deformation ability. The use temperature can reach up to 650℃, and the anti-oxidation temperature can reach up to 850℃.

Thank you upstairs. Is there any difference in the chemical element content between 304 and 304H?

304 18Cr-8Ni 304L 18Cr-8Ni-Low Carbon As a low-C 304 steel, its corrosion resistance is similar to that of 304 under normal conditions, but after welding or stress relief, its resistance to intergranular corrosion is excellent. There is a slight difference between 304 and 304L mainly in the carbon content. The carbon content of 304 is qualified if it is below 0.08. The 304L is qualified if it is below 0.03. Generally speaking, the carbon content refers to the amount of impurities. The lower the carbon content, the The corrosion resistance will be better, so 304L is more expensive than 304. In fact, in foreign countries, 304L replaces 321, but domestic people have not realized it yet. The carbon content of 304L is lower than that of 304, so the main tensile strength and yield are lower than 304. The low carbon of 304L is just to obtain better corrosion resistance and intergranular corrosion resistance! 304L is mainly used for anti-corrosive media and cannot be used for high temperature ； 304 is used for high temperature and corrosive media, and its corrosion resistance is not as good as 304L!