valve body bonnet disc materials standards

The valve body, bonnet and disc are the main parts of the valve and are directly subjected to the medium pressure. The materials used must comply with the standard of “pressure and temperature rating of the valve”.

The common materials and standard as below:

1 Gray cast iron ≤1.0MPa -10 °C ~ 200 °Cwater, steam, air, gas and oilHT200,
2 Forgable cast iron≤ 2.5MPa -30 ~ 300 °C water, steam, air and oilKTH300-06,
3 Ductile iron≤4.0MPa -30~350°C water, steam, air and oilQT400—15,
4 Acid-resistant high silicon ductile iron≤ 0.25MPa below 120 °C
5 Carbon steel≤32.0MPa -30~425°C water, steam, air, hydrogen, ammonia, nitrogen and petroleum products WC1, WCB, ZG25 and high quality steel 20, 25, 30 and low alloy structural steel 16Mn.
6Copper alloy≤ 2.5MPa -40 ~ 250 °C water, seawater, oxygen, air, oil and other media ZGnSn10Zn2 (tin bronze), H62, Hpb59-1 (brass), QAZ19-2, QA19-4 (aluminum bronze).
7High temperature copper≤17.0MPA ≤570°C steam and petroleum products ZGCr5Mo, 1Cr5M0, ZG20CrMoV, ZG15Gr1Mo1V, 12CrMoV, WC6, WC9 and other grades.
8Low temperature steel≤ 6.4Mpa ≥ -196 ° C ethylene, propylene, liquid natural gas, liquid nitrogen and other mediaZG1Cr18Ni9
9Stainless acid resistant steel≤ 6.4Mpa ≤ 200 ° CNitrite acid, acetic acid and other mediaZG0Cr18Ni9Ti

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