Gray cast iron valve material selection
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Gray cast iron valve for the nominal pressure PN ≤ 1.0MPa, the working temperature of 10 ~ 200 ℃ water, steam, air, kerosene and oil medium gray cast iron valve, the main parts of the material selection see Table 1: 1 "gray cast iron valve main parts material selection table parts name material name brand standard valve body, bonnet, opening and closing pieces, bracket Gray cast iron HT200, HT250 GB / T HT300, HT350 stem, shaft chromium stainless steel 1Cr13, 2Cr13, 3Cr13 GB / T 1220-1992 Aluminum bronze QA19-2, QA19-4 GB / T 4423-1992 Manganese brass HMn58-2 GB / T 4423-1992 Cast aluminum bronze bearings ZCuA19Mn2, ZCuA19Fe4Mn2 GB / T 1176-1987 Casting manganese brass ZCuZn38Mn2Pb2 Rocker carbon steel casting WCA, WCB, WCC GB / T Quality carbon steel 20,25,35 GB / T 699-1999 spring spring steel 50CrVA GB / T 1222-1992 60Si2Mn, 60Si2MnA Float austenitic stainless steel 1Cr18Ni9, 1Cr18Ni9Ti GB / T 1220-1992 0Cr18Ni9Ti, 1Cr17Ni3Mo2Ti filter 1Cr18Ni9, 1Cr18Ni9Ti seat, opening and closure of the sealing surface of cast aluminum brass ZCuZn25A16Fe3Mn3 GB / T 1176-1987 cast aluminum bronze ZCuA19Mn2, ZCuA19Fe4Ni4Mn2 cast manganese Brass ZCuZn38Mn2Pb2 stainless steel Steel 1Cr13,2Cr13,3Cr13 GB / T 1220-1992 1Cr18Ni9,1Cr18Ni9Ti Tinned copper wire 221 - Polytetrafluoroethylene SFB-1, SFB-2, SFB-3 HG2-534 SFBN-1, SFBN-2, SFBN- 3 HG2-535 Rubber - - Stem nut Cast aluminum ZCrZn25A1Fe3Mn3 GB / T 1176-1987 Cast aluminum bronze ZCuA19Mn2, ZCuA19Fe4Ni4Mn2 Cast manganese brass ZCrZn38Mn2Pb2 Filler Teflon SFT-1, SFT-2, SFT-2, SFT -4 HG2-538 Corrosion Asbestos - - Rubber - - Dip Teflon Asbestos Rope - - Flexible Graphite - - Handwheel Malleable Cast Iron KTH330-08, HTH350-10 GB / T 9440-1988 Ductile Iron QT400-15, QT450- Note: Gray cast iron is generally used for nominal pressure PN ≤ 1.0MPa, but for DN ≤ 200mm stop valve, lifting check valve can also be used for nominal pressure PN = 1.6MPa. Part Name Material Name Grades Standard No. Body, bonnet, opening and closing parts, bracket Gray cast iron HT200, HT250 GB / T HT300, HT350 Stem, Shaft chrome stainless steel 1Cr13, 2Cr13, 3Cr13 GB / T 1220-1992 Aluminum Bronze QA19-2, QA19-4 GB / T 4423-1992 Manganese brass HMn58-2 GB / T 4423-1992 Bushings Cast aluminum bronze ZCuA19Mn2, ZCuA19Fe4Mn2 GB / T 1176-1987 Cast manganese brass ZCuZn38Mn2Pb2 Rocker carbon cast Steel WCA, WCB, WCC GB / T Quality carbon steel 20,25,35 Spring steel 50CrVA GB / T 1222-1992 60Si2Mn, 60Si2MnA Float austenitic stainless steel 1Cr18Ni9,1Cr18Ni9Ti GB / T 1220-1992 0Cr18Ni9Ti, 1Cr17Ni3Mo2Ti Filter 1Cr18Ni9, 1Cr18Ni9Ti Seals, sealing parts for opening and closing parts Cast aluminum ZCuZn25A16Fe3Mn3 GB / T 1176-1987 Cast aluminum bronze ZCuA19Mn2, ZCuA19Fe4Ni4Mn2 Cast manganese brass ZCuZn38Mn2Pb2 Stainless steel 1Cr13,2Cr13,3Cr13 GB / T 1220-1992 1Cr18Ni9,1Cr18Ni9Ti Tinned copper wire 221 - Polytetrafluoroethylene SFB-1, SFB-2, SFB-3 HG2-534 SFBN-1, SFBN- Stem nut Cast aluminum brass ZCrZn25A1Fe3Mn3 GB / T 1176-1987 Cast aluminum bronze Z CuA19Mn2, ZCuA19Fe4Ni4Mn2 Cast Manganese Brass ZCrZn38Mn2Pb2 Filler Teflon SFT-1, SFT-2, SFT-2, SFT-4 HG2-538 Corrosion Asbestos - - Rubber - - Polytetrafluoroethylene Asbestos Rope - - Flexible Graphite - - Hand wheel malleable cast iron KTH330-08, HTH350-10 GB / T 9440-1988 Ductile iron QT400-15, QT450-10 GB / T