American standard grade issue
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I would like to ask everyone: Regarding American standard stainless steel grades – for example, what does the ‘S’ in 309S stand for? What does H in 304H stand for? How does it compare to ordinary 309 and 304 in terms of composition, mechanical properties, and processability? What’s the difference?
The addition of S indicates the presence of sulfur, which makes the stainless steel easier to cut; the addition of H means that the carbon content in the material is higher than normal, resulting in greater strength as well.