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                    NEWS

                    • Introduction of common valve materials

                       

                       

                      Malleable cast iron: suitable for water, steam, air and oil medium with nominal pressure PN≤ 2.5mpa and temperature -30 ~ 300℃, commonly used grades are: KTH300 -- 06, KTH330 -- 08, KTH350 -- 10.

                       

                      Gray cast iron: gray cast iron is suitable for medium such as water, steam, air, gas and oil with nominal pressure PN≤1.0MPa and temperature ranging from -10℃ to 200℃. The commonly used brands of gray cast iron are: HT200, HT250, HT300, HT350.

                       

                      Ductile iron: suitable for medium of water, steam, air and oil at temperature of -30 ~ 350℃ PN≤4.0MPa. Common brands are: qt400-15, qt450-10, qt500-7. In view of the current domestic technology level, the factory is uneven, and users are often not easy to test. According to experience, it is recommended that PN≤ 2.5mpa, or steel valve for safety.

                       

                      Stainless acid-resistant steel, suitable for nominal pressure PN≤ 6.4mpa, temperature ≤200℃ nitric acid, acetic acid and other media, common grades are ZG0Cr18Ni9Ti, zg0cr18ni18ni10 < >, ZG0Cr18Ni12Mo2Ti, ZG1Cr18Ni12Mo2Ti< acid resistance and urea >.

                       

                      Low temperature steel, suitable for nominal pressure PN≤ 6.4mpa, temperature ≥ -- 196℃ ethylene, propylene, liquid natural gas, liquid nitrogen and other media, common grades) ZG1Cr18Ni9, 0Cr18Ni9, 1Cr18Ni9Ti, ZG0Cr18Ni9.

                       

                      High temperature steel: suitable for steam and petroleum products with nominal pressure PN≤17.0MPA and temperature ≤570℃. Commonly used brand ZGCr5Mo, 1 cr5m0. ZG20CrMoV, ZG15Gr1Mo1V, 12 crmov WC6, WC9, etc. Specific selection must be in accordance with the valve pressure and temperature specifications.

                       

                      8. Acid-resistant high-silicon ductile iron: suitable for corrosive medium with nominal pressure PN≤0.25MPa and temperature less than 120℃.

                       

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

                       

                      Vi. Copper alloy: suitable for PN≤ 2.5mpa medium of water, sea water, oxygen, air, oil and steam medium of temperature -40 ~ 250℃, commonly used grades are ZGnSn10Zn2(tin bronze), H62, Hpb59 -- 1(brass), QAZ19 -- 2, QA19 -- 4(aluminum bronze).

                       

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