Piping material of 304 l stainless steel centrifugal pump, what is the difference between 304 and 304 h

Have horizontal and vertical pipeline centrifugal water pump, the material generally cast iron material, stainless steel material and lining fluorine material, such as 304316 and so on stainless steel material, stainless steel 304 l, 304, 304 h what is the difference between the three? Actually according to nickel chromium content is 304 stainless steel, the ingredients are chromium containing 18% ( Cr) And 8% of the nickel ( 倪) , but the main difference is that carbon content is different. Ultra-low carbon is 304 l stainless steel, carbon content down to zero. Below 03%, can avoid intergranular corrosion and stress corrosion resistance, in theory, the effect is better than 304, but the effect is not obvious in the practical application. Lower carbon and the purpose of adding titanium is the same, but the high cost plus 321 titanium smelting, steel thick, the price is also more expensive. 304 H in H refers to the high temperature, high carbon content is the guarantee of high temperature strength, austenitic steel used in GB150 requirements above 525 degrees, the carbon content is not less than 0. 04%, carbide is strengthening phase, especially the high temperature strength is better than that of pure austenite. Of the three, high carbon content is 304 h, low carbon content is 304 l, 304 stainless steel and carbon content between the two. The higher the carbon content of stainless steel corrosion resistance, the worse is easy to rust. Carbon content of different also led to its price will be difference, or that sentence USES different requirements are different. In addition, from the two list can decide, think that can be used instead of 304 304 l view is wrong, I can use is associated with using occasions, and in accordance with the rules regulations, we have no right to & quot; Material substitution & quot; , only original design department can have the right to & quot; Material substitution & quot; Work, to this point, please be sure to remember.
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