With the development in industrial technology, there is an ever-increasing demand for a more advanced degree of process accuracy. Needless to say, the prevention of heat deformation to ensure accuracy in processing machines, measuring machines, optical instruments, and various precision parts is critical for the promotion of higher performance. In other words, the best solution is to maintain the accuracy of various equipments, parts and components by using alloy materials that show low, controlled thermal-expansion characteristics.
MMC Superalloy manufactures various controlled expansion alloys based on the melting and machining technologies and quality control methods accumulated through its work in aircrafts, nuclear power material, and automobiles.
Properties of typical Fe-base alloys and Ni-base alloys are introduced here as for your alloy selection. Please note that all data are average values based on experimental data and not guaranteed values.
| Controlled expansion alloys | Glass sealing alloys/ constant elasticity alloys | High strength/oxidation-resistant controlled expansion alloys | Comparison | ||||
|---|---|---|---|---|---|---|---|
| MA-INV36 | MA-S-INVER | MA-F15KV | MA902 | MA-B2 | Mo | SUS304 | |
| Main features | Near zero coefficient of linear thermal expansion, approximately one-tenth that of carbon steels at room temperature. | Shows the lowest thermal expansion, which is almost zero, among metallic materials | Generally known for hard glass sealing. Thermal expansion is close to hard glass and ceramics. | Known as the alloy which has very low Young's modulus temperature coefficient. Thermal expansion coefficient is also low. By setting the proper heat treatment conditions, high strength can be obtained. | A corrosion-resistant alloy which is resistant up to the boiling point in all concentrations. Also, it is applied as material for electronic componentss. For its nonmagnetic quality, it is suitable for componentss that are incompatible with magnetic field. | Shows a very high melting point at 2620°C, it retains a high strength and low expansion qualities up to the high temperature range. | In addition to its main application to the petrochemical industry, as a corrosion resistant alloy, recently this alloy is widely applied to low and high temperature fields of industries and consumer durables. |
| Composition | Fe-36Ni | Fe-32Ni-5Co | Fe-29Ni-17Co | Fe-42Ni-Cr-Ti | Ni-28Mo-2Fe | 3N | Fe-18Cr-8Ni |
| Density | 8.12 | 8.15 | 8.35 | 8.11 | 9.22 | 10.2 | 7.93 |
| Melting Point (°C) | 1425 | 1440 | 1450 | 1454-1482 | 1302-1368 | 2620 | 1400-1453 |
| Curie Point(°C) | 210 | 240 | 440 | Solution treatment 211 |
- | - | - |
| Thermal Conductivity(W/mK,room temperature) | 13.4 | 13.7 | 19.7 | 20.9 | 11.1(0°C) | 138 | 16.3(100°C) |
| Specific heat(cal/g•K,room temperature) | 0.108 | 0.110 | 0.114 | 0.12 | 0.089 | 0.061 | 0.12 |
| Average thermal expansion coefficient(RT-100°C) | 0.5∼2×10-6/K | 0∼1.5×10-6/K | 5×10-6/K | 6.8×10-6/K | 10.8×10-6/K | 5.3×10-6/K | 17.3×10-6/K |
| Young' s modulus(GPa,room temperature) | 142 | 136 | 133 | Cold processing+age hardening treatment195 | 217 | 324 | 196 |
| Tensile strength(MPa,room temperature) | 411 | 444 | 477 | Solution treatment 565 |
890 | 833-932 | 578 |
| Yield strength(Mpa,room temperature) | 237 | 282 | 321 | Solution treatment 212 |
410 | 686-785 | 226 |
| Elongation(%,room temperature) | 30 | 32 | 31 | Solution treatment 40 |
61 | 5-15 | 60 |
| Hardness | HV120 | HV130 | HV150 | HV125 | HV215 | HV250 | HV150 |
| Applications | Reference piece for length, electric components, optical instrument components, lead frame | High grade vibration isolation system, optical instrument components, gauge block | Hard glass sealing, ceramics sealing, electronic tube components, semiconductor lead frame | Sensor componentss, electronic resonance devices, spring components | Application of corrosion resistance to hydrochloric acid, high strength fine line, LC-related components, electric components | Lighting related, electronic tube related, semiconductor related, vacuum deposition related, high temperature furnace material related, nuclear power related items | General corrosion resistant alloy, low temperature related equipments, equipment used in high temperature |
*Each data is an average value based on experimental data, and is not a guaranteed value.
Reference
MA-INV36:Commonly known as Invar
MA-S-INVER:Commonly known as Super Invar
MA-F15KV:Commonly known as Kovar
MA902:Commonly known as NI-SPAN-C
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