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PRODUCTS:Alloy 27
GRADE:4J28
PRODUCTION STANDARD:
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  • SPECIFICATION


    Introduction:
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    Glass Sealing "27" Alloy,it's glass-to-metal sealing and iron-chromium alloy.nominally 28 % chromium, in strip, bar, wire, and rod forms intended primarily for sealing to glass in electronic applications.UNS K92801 should only be considered for use at service temperatures below 300°C. The alloy is prone to sigma phase formation at temperatures close to 620°C, and exhibits brittle mechanical behavior after prolonged exposures at temperatures close to 475°C.
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    Glass sealed and controlled expansion alloys

    *Alloy 27 , ASTM F-256  ,UNS K92801,(Fe-28Cr)Chinese 4J28

    Grade and Chemical Composition (see Table 1)

    Table 1 Grade and Chemical Composition

    Grade

    Chemical Composition (%)

    C

    P

    S

    Mn

    Si

    Ni

    N

    Cr

    Fe

    4J28

    0.12

    0.02

    0.02

    1.00

    0.70

    0.50

    0.20

    27.029.0

    Bal

    Notes:

        1Under condition that the average coefficient of the linear expansion meets the requirements of the standard, the content of chromium is allowed to deviate from the stated range.

            2The shape and dimensions of the alloys are in compliance with GB/T14985.

      Physical Property (see Table2 & Table 3)

    Table 2 Coefficient of Linear Expansion

    Grade

    Heat Treatment of the Samples

    Average Coefficient of Linear Expansion

    20530°C

    4J28

    Heat to 1100±20°C, hold for 15min., cool to room temperature in the air.

    10.811.4

    NOTE: The hardness of the annealed strip should be no more than 170. Hardness inspection is not required when the thickness of the strip is less than0.2mm.

    Table 4 Coefficient of Linear Expansion

    Grade

    Average Coefficient of Linear Expansion ā/(10-6/K)

    20200

    20300

    20400

    20450

    20500

    20600

    20700

    20800

    4J28

    10.0

    10.5

    10.8

    -

    11.1

    11.2

    11.6

    11.6

       Usage: It is applied to seal the equipment of the electric component with the soft glass.



    Specification:
    Sheet/Plate, Bar/Rod/Wire/Coil

    Size Range:
    *Sheet---thickness 0.1mm~3.5mm, width:≤300mm,Condition: cold rolled, bright, bright annealed
    *Plate---thickness 3.5mm~40.0mm,width:≤300mm,Condition: cold rolled, hot rolled, annealed
    *Round Wire---Dia 0.1mm~Dia 5.0mm,Condition: cold drawn, bright, bright annealed
    *Flat Wire---Dia 0.5mm~Dia 5.0mm,length:≤1000mm,Condition:flat rolled, bright annealed
    *Bar---Dia 5.0mm~Dia 8.0mm,length:≤2000mm,Condition:cold drawn,bright, bright annealed
           Dia 8.0mm~Dia 32.0mm,length:≤2500mm,Condition:hot rolled,bright, bright annealed
           Dia 32.0mm~Dia 180.0mm,length:≤1300mm,Condition:hot forging,peeled, turned, hot treated

    Note: we could do any other products with specified technical standard, say, ASTM,SAE,DIN,S.E.W.,JIS,ISO,IEC,NF,BS,ΓОСТ.PLS contact us for more information: Tel: +86-29-89396652 or e-mail us at: Sales@xaleipeng.com



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