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30
2022
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09
What are the commonly used materials of valves in China?
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What are the commonly used materials of valves in China?
1、 Grey cast iron: grey cast iron is applicable to water, steam, air, gas, oil and other media with nominal pressure PN ≤ 1.0MPa and temperature of - 10 ℃~200 ℃. Common grades of gray cast iron are HT200, HT250, HT300 and HT350.
2、 Malleable cast iron: applicable to water, steam, air and oil medium with nominal pressure PN ≤ 2.5MPa and temperature of - 30~300 ℃. Common brands are KTH300-06, KTH330-08 and KTH350-10.
3、 Ductile iron: suitable for water, steam, air, oil and other media with PN ≤ 4.0MPa and temperature of - 30~350 ℃. Common brands include QT400-15, QT450-10 and QT500-7.
In view of the current domestic technology level, various factories are uneven, and it is often difficult for users to inspect. According to experience, it is recommended that PN ≤ 2.5MPa, and steel valves should be used for safety.
4、 Acid resistant high silicon ductile iron: suitable for corrosive medium with nominal pressure PN ≤ 0.25MPa and temperature lower than 120 ℃.
5、 Carbon steel: applicable to water, steam, air, hydrogen, ammonia, nitrogen and petroleum products with nominal pressure PN ≤ 32.0MPa and temperature of - 30~425 ℃. Common grades include WC1, WCB, ZG25, high-quality steel 20, 25, 30 and low-alloy structural steel 16Mn.
6、 Copper alloy: suitable for water, sea water, oxygen, air, oil and other media with PN ≤ 2.5MPa, as well as steam media with temperature of - 40~250 ℃. Common brands are ZGnSn10Zn2 (tin bronze), H62, Hpb59-1 (brass), QAZ19-2, QA19-4 (aluminum bronze).
7、 High temperature copper: applicable to steam and petroleum products with nominal pressure PN ≤ 17.0MPA and temperature ≤ 570 ℃. Common brands include ZGCr5Mo, 1Cr5M0.ZG20CrMoV, ZG15Gr1Mo1V, 12CrMoV, WC6, WC9, etc. The specific selection must be in accordance with the valve pressure and temperature specifications.
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