As of now, which is better between J41H and J41Y for valves?
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This post was last edited by Qingse Nianhua on 2019-2-14 at 15:01. H: Alloy steel seal. . Y: Rigid seal. How can the two be distinguished? Seeking advice
The materials of the sealing surfaces are alloy steel on one hand, and cemented carbide steel on the other. If it comes to appearance, it’s hard to tell the difference; the materials are different. As for which one is better, it’s hard to say; each type of valve has a suitable medium, and the one that suits that medium is the good one. For the differences between H and Y, you can refer to the post on the forum: https://bbs.hcbbs.com/thread-1072470-1-1.html
H is a bit more expensive than Y; Y has better corrosion resistance, and it is more suitable for high-temperature and steam environments
H refers to martensitic stainless steels, such as those in the 13Cr series – the cheapest type of stainless steel. Y denotes cermets, including YG8 alloy, Hastelloy, Monel alloy, etc. As the name implies, cermets have a much higher hardness, better wear resistance, and greater corrosion resistance compared to H-series materials
In order from lowest to highest, common sealing materials include 13Cr, 304, 316, duplex steel, and cemented carbide
Tungsten carbide can also be 304 or 316; is that okay?
No, 304, 316, 347, 321, and the like are all austenitic stainless steels of the 3 series, which contain relatively few alloying elements, whereas cemented carbides are composed almost entirely of alloying elements
Those with Y are fine; H should be considered stainless steel, while Y refers to alloy steel
The hardness is different, but the appearance is the same