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Precision Alloy 4J42/4J48/4J52The application of Precision Alloy 4J42/4J48/4J52 : ?It is applied to soft glass-to-metal and ceramic-to-metal seals in electronic component.*Alloy 42,Website:http://www.astrongmagnet.com,ASTM F30,UNS k94100,(Fe-42Ni),Chinese 4J42*Alloy 52,ASTM F30,UNS K95050, (Fe-50Ni),Chinese 4J50*sealmet HC-4,,alloy426, ASTM F31,UNS k94760, (Fe-42Ni-6Cr),Chinese 4J6Usage: It is applied to soft glass-to-metal and ceramic-to-metal seals in electronic component.Table 1 Grade & Chemical CompositionGradeGrade & Chemical Composition(%)CPSMnSiBAlCoNiCrFe4J60.050.0200.0200.250.300.2041.5~42.55.50~6.30Balance4J470.050.0200.0200.400.3046.8~47.80.80~1.40Balance4J490.050.0200.0200.400.300.0246.0~48.05.00~6.00Balance4J420.050.0200.0200.800.300.101.041.5~42.5Balance4J450.050.0200.0200.800.300.1044.5~45.5Balance4J500.050.0200.0200.800.300.1049.0~50.5Balance4J520.050.0200.0200.600.30-51.5~52.5Balance4J540.050.0200.0200.600.30--53.5~54.5BalanceNotes: 1,Under condition that the average coefficient of the linear expansion meets the requirements of the standard, the content of nickel and cobalt are allowed to deviate from the stated range. 2,The shape and dimensions of the alloys are in compliance with YB/T5235.Table 2 Heat Treatment & Coefficient of Linear ExpansionGradeHeat Treatment System of the SamplesAverage Coefficient of Linear Expansion20-300 C20~400 C20-450 C4J6To be heat treated at a temperature of 1130 20 C in the hydrogen, hold for 15 min., cool to 200 C at a rate less than 5 C/min7.6~8.39.5~10.24J478.1~8.74J498.6~9.39.4~l0.14J42To be heat treated at a temperature of 900 20 C in the hydrogen, hold for 1h, cool at a rate less than 5 C/min to 200 C4.0~5.06.5~7.54J456.5~7.26.5~7.24J509.2~10.09.2~9.94J52To be heat treated at a temperature of 850 20 C in the hydrogen, hold for 1h, cool at a rate less than 300 C/H to 400 C9.8~11.09.8~11.04J5410.2~11.410.2~11.4Table 3 Typical Expansion CoefficientGradeAverage Coefficient of Linear Expansion ?/(10-6/K)20~100 C20~20

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