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The brand and characteristics corresponding to the universal name of valve material

Issuing time:2021-10-26 15:20

1、 Grey cast iron: Grey cast iron is suitable for media such as water, steam, air, gas, and oil with a nominal pressure PN ≤ 1.0MPa and a temperature range of -10 ℃ to 200 ℃. The commonly used grades of gray cast iron are HT200, HT250, HT300, and HT350.

2、 Malleable cast iron: suitable for water, steam, air, and oil media with a nominal pressure PN ≤ 2.5MPa and a temperature of -30~300 ℃. Commonly used grades include KTH300-06, KTH330-08, and KTH350-10.

3、 Ductile iron: suitable for media with PN ≤ 4.0MPa and temperatures ranging from -30 to 350 ℃, such as water, steam, air, and oil. Commonly used brands include QT400-15, QT450-10, and QT500-7.

Given the current level of domestic technology and the uneven nature of various factories, it is often difficult for users to inspect. Based on experience, it is recommended to use steel valves for safety when PN ≤ 2.5MPa.

4、 Acid resistant high silicon ductile iron: suitable for corrosive media with nominal pressure PN ≤ 0.25MPa and temperature below 120 ℃.

5、 Carbon steel: suitable for media such as water, steam, air, hydrogen, ammonia, nitrogen, and petroleum products with a nominal pressure of PN ≤ 32.0MPa and a temperature of -30~425 ℃. Commonly used grades include WC1, WCB, ZG25, high-quality steel 20, 25, 30, and low alloy structural steel 16Mn.

6、 Copper alloy: suitable for water, seawater, oxygen, air, oil and other media with PN ≤ 2.5MPa, as well as steam media with temperatures ranging from -40 to 250 ℃. Commonly used brands are ZGnSn10Zn2 (tin bronze), H62, Hpb59-1 (brass), QAZ19-2, QA19-4 (aluminum bronze).

7、 High temperature copper: suitable for steam and petroleum products with nominal pressure PN ≤ 17.0MPA and temperature ≤ 570 ℃. Commonly used brands include ZGCr5Mo, 1Cr5M0. ZG20CrMoV, ZG15Gr1Mo1V, 12CrMoV, WC6, WC9, and other brands. The specific selection must comply with the regulations of valve pressure and temperature specifications.

8、 Low temperature steel: suitable for nominal pressure PN ≤ 6.4Mpa, temperature ≥ -196 ℃ ethylene, propylene, liquid natural gas, liquid nitrogen and other media, commonly used grades include ZG1Cr18Ni9, 0Cr18Ni9, 1Cr18Ni9Ti, ZG0Cr18Ni9

9、 Stainless acid resistant steel: suitable for medium with nominal pressure PN ≤ 6.4Mpa, temperature ≤ 200 ℃ nitric acid, acetic acid, etc. Commonly used grades include ZG0Cr18Ni9Ti, ZG0Cr18Ni10<nitric acid resistance>, ZG0Cr18Ni12Mo2Ti, ZG1Cr18Ni12Mo2Ti<acid and urea resistance>


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