Sealing And Expansion Alloy

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SEALING AND EXPANSION ALLOY

Sealing And Expansion Alloy Supplier In India We produce a range of FeNi, FeNiCr and FeNiCo alloys, which are known as controlled expansion alloys. These have a linear coefficient of thermal expansion from close to 0 up to 12 x 10-6/K, within a predetermined temperature range. These alloys are established as the standard alloys for glass-to-metal and glass-to-ceramic sealing, as well as low expansion alloys.

The thermal expansion coefficients of these alloys can be matched to various types of glass and ceramic.These alloys can be easily further processed by either hot or cold manufacturing methods. They possess similar machining properties to austenitic steels. Welding and brazing these alloys presents no particular problems.

These are nickel-iron based alloys that are required for applications where a hermetic seal is required between metal and glass or ceramic. They are also used for applications where a certain thermal expansion is required over a given temperature range. Examples of such applications are light bulbs, vacuum tubes, optoelectronics, etc.

Other Alloys

Alloy 36 This grade exhibits near zero coefficient of thermal expansion from room temperature to 100 °C. It is used for applications that cannot tolerate any dimensional changes due to temperature changes. It finds use in precision laser measurement equipment, electronic devices, instrumentation, thermostats, and in antenna/aerial technologies. Another common usage is for making the low expansion part of Bimetallic Thermostats.

Alloy 42 has a constant low rate of thermal expansion up to temperatures approaching 350 °C. The thermal coefficient of expansion of this alloy matches that of soft glass. As a result, it is used for glass-sealing applications in microelectronic components and vacuum devices. Alloy 42 is also used as the core of Dumet wire, which forms the glass-sealing component of the lead-in-wires used in electric light bulbs. This alloy is also used for thermostats and thermo switches.

Alloy 48 has a thermal expansion coefficient which matches that of soda-lime glass. It is widely used for electric wiring in glass-to-metal connections. It is also used in thermostats for industrial applications up to 450 °C.

Alloy 52 is also a glass-to-metal sealing alloy that is used in compact fluorescent lamps (CFL) and other electronic applications.

Alloy 54 is also a glass-to-metal sealing alloy that is used in compact fluorescent lamps (CFLs), special auto lamps and other electronic applications.

Note : Other variants with customer specified Nickel content can also be manufactured. Please contact us for more details.

ALLOY
AMW-TRADE NAMEALLOYSTANDARDMATERIAL NO. DIN / UNS
Dilation 36FeNi36SEW 385/DIN 177451.3912
Dilation 41FeNi41ASTM F30K 94100
Dilation 42FeNi42SEW 385/DIN 177451.3917
Dilation 46FeNi46SEW 385/DIN 17745 ASTM F301.3920/K 94600
Dilation 51FeNi51SEW 385/DIN 17745 ASTM F302.4478/N 14052
Dilation 51 Cr1FeNi51Cr1SEW 385/DIN 177452.4480
Dilation 29/18FeNi28Co18MnSEW 385/DIN 17745/ASTM F 151.3981/K 94610
Dilation 48Cr6A1FeNi48Cr6A1
AVERAGE CHEMICAL COMPOSITION (mass %)
AMW-TRADE NAMENICOMNALCUCRSIFE
Dilation 3636≤ 0.05≤ 0.50≤ 0.10n.sn.s≤ 0.50Bal
Dilation 4141≤ 0.05≤ 0.80≤ 0.10≤ 0.10≤ 0.25≤ 0.30Bal
Dilation 4242≤ 0.05≤ 1.00≤ 0.10≤ 0.15≤ 0.05≤ 0.30Bal
Dilation 4646≤ 0.05≤ 0.80≤ 0.10n.s≤ 0.25≤ 0.30Bal
Dilation 51≥50n.s≤ 0.60≤ 0.10n.s≤ 0.25≤ 0.30Bal
Dilation 51 Cr1≥50≤ 0.50≤ 1.00≤ 0.10n.s0.7-1.1≤ 0.30Bal
Dilation 29/182917.1≤ 0.50≤ 0.10≤ 0.20≤ 0.20≤ 0.20Bal
Dilation 48Cr6A147n.s≤ 0.30≤ 0.40≤ 0.035.3-6.3≤ 0.40Bal
PHYSICAL PROPERTIES
AMW-TRADE NAME DENSITY MELTING TEMPERATURE ELECTRICAL RESISTIVITY AT 20˚C THERMAL CONDUCTIVITY AT 20˚C MODULUS OF ELASTICITY
g/cm3 ˚C µΩ m W/m˚k GPa
Dilation 36 8.2 14.3 0.78 13 137
Dilation 41 8.2 1440 0.64 15 142
Dilation 42 8.2 1440 0.62 15 142
Dilation 46 8.2 1440 0.55 15 152
Dilation 51 8.3 1450 0.43 17 160
Dilation 51 Cr1 8.2 1450 0.43 17 157
Dilation 29/18 8.2 1450 0.45 17 157
Dilation 48Cr6A1 8.3 1440 0.85
THERMAL EXPANSION CHARACTERISTICS
AMW-TRADE NAME AVERAGE LINEAR THERMAL EXPANSION COEFFICIENT 10.6/K, base temperature 20 ˚C, temperatures ˚C INFLECTION-POINT/ CURIE-TEMPERATURE
100 150 200 300 400 500 600
Dilation 36 1.5 1.9 2.6 5.3 8.1 9.9 11.1 230
Dilation 41 4.6 4.4 4.2 4.2 5.8 7.9 9.4 340
Dilation 42 5.8 5.6 5.4 5.4 6.2 355
Dilation 46 7.9 7.8 7.7 7.4 7.3 8.6 9.7 400
Dilation 51 10.3 10.3 10.2 10.1 9.9 10.0 10.9 500
Dilation 51 Cr1 10.4 10.4 10.4 10.4 10.4 10.5 11.0 490
Dilation 29/18 6.5 6.2 5.9 5.4 5.1 6.2 7.8 425
Dilation 48Cr6A1 10.3 340

Heat treatment 900˚C, Medium hydrogen

Annealing time 0.5 h,

Cooling time to 100˚C longer than 10 h

MECHANICAL PROPERTIES
AMW-TRADE NAME YIELD STRENGTH RP 0.2 TENSILE STRENGTH RM ELONGATION BRINELL-HARDNESS
MPa MPa % HB
Dilation 36 280 500 35 130
Dilation 41 270 500 35 130
Dilation 42 300 510 30 130
Dilation 46 370 500 35 140
Dilation 51 280 550 30 135
Dilation 51 Cr1 280 560 30 135
Dilation 29/18 350 540 35 155
Dilation 48Cr6A1 540 30 130

Average values for condition “Annealed and recrystallized”

DIMENSIONS AND TOLERANCES

THICKNESS TOLERANCES

THICKNESS WIDTH 10 -50 WIDTH > 50 – 200 WIDTH > 200 – 320
0.10 – 0.20 + 0.010 ± 0.015 ± 0.020
> 0.20 – 0.50 + 0.020 ± 0.020 ± 0.030
> 0.50 – 1.00 + 0.030 ± 0.030 ± 0.040
> 1.00 + 0.050 ± 0.050 ± 0.070

Other thickness and tolerances on request.

WIDTH TOLERANCES

WIDTH THICKNESS 0.10 – 0.20 THICKNESS > 0.20 – 0.50 THICKNESS > 0.50 – 1.00 THICKNESS > 1.00 – 2.00 THICKNESS > 2.00
10 – 50 ± 0.1 ± 0.2 ± 0.2 ± 0.3 ± 0.4
> 50 – 200 ± 0.2 ± 0.3 ± 0.3 ± 0.4 ± 0.5
> 200 – 320 ± 0.3 ± 0.4 ± 0.5 ± 0.6 ± 0.8

Other thickness and tolerances on request.

LENGTH TOLERANCES (CUT LENGTH)

THICKNESS LENGTH 500 – 3000
0.40 – 2.00 + 10

Other tolerances on request.

DIMENSIONS AND TOLERANCES
FORM THICKNESS WIDTH LENGTH COIL-ID COIL-OD
Strips 0.10 – 3.00 10 – 320 300 / 400 / 500 Max. 1050
Cut Length 0.40 – 2.00 50 – 320 500 – 300

For Any Inquiries Contact:-

Ms. Pragati Sanap

(Sales Manager)

Call +91 8928403611 or Email: sales@domadia.com

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