20 Valve Materials - Stem Materials

Valve stem material
During the opening and closing process of Lined Valve, the valve stem is subjected to pulling, compressing and torsion forces, and is in direct contact with the medium, and there is relative friction movement between the valve stem and the packing.
Therefore, the valve stem material must ensure sufficient strength and impact toughness at the specified temperature, have certain corrosion resistance and abrasion resistance, and good processability.

Carbon steel
When used for water and steam media with low pressure and medium temperature not exceeding 300℃, A5 ordinary carbon steel is generally selected.
When used for water and steam media with medium pressure and medium temperature not exceeding 450℃, 35 professional carbon steel is generally selected.

Alloy steel
When used for water, steam, oil and other media with medium and high pressure and medium temperature not exceeding 450℃, 40Cr (chrome steel) is generally selected.
When used for water, steam and other media with high pressure and medium temperature not exceeding 540℃, 38CrMoALA nitriding steel can be selected.
When used for steam media with high pressure and medium temperature not exceeding 570℃, 25Cr2MoVA chrome-molybdenum-vanadium steel is generally selected.

Stainless acid-resistant steel
For medium and high pressure, non-corrosive and weakly corrosive media with a medium temperature not exceeding 450°C, 1Cr13, 2Cr13, and 3Cr13 chromium stainless steels can be selected.
When used for corrosive media, stainless acid-resistant steels such as Cr17Ni2, 1Cr18Ni9Ti, Cr18Ni12Mo2Ti, and Cr18Ni12Mo3Ti and PH15-7Mo precipitation hardening steel can be selected.

Heat-resistant steel
When used for high-temperature valves with a medium temperature not exceeding 600°C, 4Cr10Si2Mo martensitic heat-resistant steel and 4Cr14Ni14W2Mo austenitic heat-resistant steel can be selected.