What is a pneumatic valve stem material

pneumatic valve rod in the process of pneumatic valve opening and closing, pull, pressure and under torsional force, and direct contact with the media, and packing friction and relative movement between at the same time, so the pneumatic valve stem material must ensure that the specified temperatures have sufficient strength and impact toughness, has certain corrosion resistance and abrasion resistance, and good manufacturability.
material has the following several kinds of commonly used pneumatic valve rod. A, carbon steel,

for low and medium temperature not to exceed ℃ water, steam medium, generally choose A ordinary carbon steel.
used for medium and medium temperature not to exceed ℃ water, steam, generally choose quality carbon steel.

2, alloy steel used for medium and high pressure, medium temperature not to exceed ℃ medium such as water, steam, oil, generally choose Cr ( Chrome steel) 。
used in high pressure, medium temperature not to exceed ℃ medium such as water, steam, can choose CrMoALA permeability
nitrogen steel.
used in high pressure, medium temperature not to exceed ℃ steam medium, generally choose molybdenum CrMoVA chrome vanadium steel.

3, stainless acid-resistant steel used for medium and high pressure, medium temperature does not exceed ℃ of corrosive medium and weak corrosive medium, optional
with Cr, Cr, Cr chromium stainless steel.
when used in corrosive medium, can choose CrNi, CrNiTi, CrNiMoTi, CrNiMoTi stainless acid-resistant steel and PH - Mo precipitation hardened steel.

4, heat-resistant steel used in the medium temperature is less than the ℃ high temperature pneumatic valve can choose CrSiMo martensite heat-resistant steel and heat resistant steel CrNiWMo austenite size size.