Fastener materials: Fasteners mainly include bolts, studs and nuts. The fastener directly bears the pressure on the
valve, which plays a key role in preventing the outflow of the medium. Therefore, the selected material must ensure sufficient strength and impact toughness at the operating temperature.
When selecting fastener materials according to medium pressure and temperature, the following table can be selected:
|Name||Pn(Mpa)||medium temp /°C|
Heat treatment must be carried out when selecting alloy steel materials. When there are special corrosion resistance requirements for fasteners, stainless acid-resistant steels such as Cr17Ni2, 2Cr13, 1Cr18Ni9 can be selected.