| Customization: | Available |
|---|---|
| Classification: | Low Expansion Alloy |
| Certificate: | ISO, ABS, BV, CCS, Dnv, Lr, Gl, Mill Certificate |
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4j36 / Uns K93600/ASTM Invar 36 Precision Alloy Wire
(Common Name: Invar, FeNi36, Invar Standard, Vacodil36)
4J36 (Invar), also known generically as FeNi36 (64FeNi in the US), is a nickel-iron alloy notable for its uniquely low coefficient of thermal expansion (CTE or α).
4J36 (Invar) is used where high dimensional stability is required, such as precision instruments, clocks, seismic creep gauges, television shadow-mask frames, valves in motors, and antimagnetic watches. In land surveying, when first-order (high-precision) elevation leveling is to be performed, the Level staff (leveling rod) used is made of Invar, instead of wood, fiberglass, or other metals. Invar struts were used in some pistons to limit their thermal expansion inside their cylinders.
4J36 use oxyacetylene welding, electric arc welding, welding and other welding methods. Since the coefficient of expansion and chemical composition of the alloy is related should be avoided due to welding causes a change in the alloy composition, it is preferable to use Argon arc welding welding filler metals preferably contains 0.5% to 1.5% titanium, in order to reduce weld porosity and crack.
| Controlled Expansion and Glass Sealing Alloys | |||
| German standard number | Tradename | DIN | UNS |
| 1.3912 | Alloy 36 | 17745 | K93600/93601 |
| 1.3917 | Alloy 42 | 17745 | K94100 |
| 1.3922 | Alloy 48 | 17745 | K94800 |
| 1.3981 | Pernifer2918 | 17745 | K94610 |
| 2.4478 | NiFe 47 | 17745 | N14052 |
| 2.4486 | NiFe47Cr | 17745 | - |
Normal composition%
| Ni | 35~37.0 | Fe | Bal. | Co | - | Si | ≤0.3 |
| Mo | - | Cu | - | Cr | - | Mn | 0.2~0.6 |
| C | ≤0.05 | P | ≤0.02 | S | ≤0.02 |
Coefficient of expansion
| θ/ºC | α1/10-6ºC-1 | θ/ºC | α1/10-6ºC-1 |
| 20~-60 | 1.8 | 20~250 | 3.6 |
| 20~-40 | 1.8 | 20~300 | 5.2 |
| 20~-20 | 1.6 | 20~350 | 6.5 |
| 20~-0 | 1.6 | 20~400 | 7.8 |
| 20~50 | 1.1 | 20~450 | 8.9 |
| 20~100 | 1.4 | 20~500 | 9.7 |
| 20~150 | 1.9 | 20~550 | 10.4 |
| 20~200 | 2.5 | 20~600 | 11.0 |
Typical Physical properties
| Density (g/cm3) | 8.1 |
| Electrical resistivity at 20ºC(OMmm2/m) | 0.78 |
| Temperature factor of resistivity(20ºC~200ºC)X10-6/ºC | 3.7~3.9 |
| Thermal conductivity, λ/ W/(m*ºC) | 11 |
| Curie point Tc/ ºC | 230 |
| Elastic Modulus, E/ Gpa | 144 |
| The heat treatment process | |
| Annealing for stress relief | Heated to 530~550ºC and hold 1~2 h. Cold down |
| annealing | In order to eliminate hardening, which be bring out in cold-rolled, cold drawing process. Annealing needs heated to 830~880ºC in vacuum,hold 30 min. |
| The stabilization process |
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| Precautions |
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Typical Mechanical properties
| Tensile Strength | Elongation |
| Mpa | % |
| 641 | 14 |
| 689 | 9 |
| 731 | 8 |
Temperature factor of resistivity
| Temperature range, ºC | 20~50 | 20~100 | 20~200 | 20~300 | 20~400 |
| aR/ 103 *ºC | 1.8 | 1.7 | 1.4 | 1.2 | 1.0 |
| Inconel |
Inconel 722, Inconel 725, Inconel X-750, Inconel 625, Inconel 686, Inconel 690, Inconel 702, Inconel 706, Inconel 713C, Inconel 600, Inconel 601, Inconel 602CA, Inconel 617, Inconel 718.
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| Incoloy | Incoloy 945, Incoloy A-286, Incoloy 901, Incoloy 903, Incoloy 907, Incoloy 909, Incoloy 925, Incoloy 926, Incoloy 330, Incoloy 800, Incoloy 800H, Incoloy 800HT, Incoloy 801, Incoloy 840, Incoloy 20, Incoloy 205, Incoloy 208 |
| Hastelloy | Hastelloy C 276, Hastelloy G, Hastelloy W, Hastelloy X, Hastelloy G-30, Hastelloy G-35, Hastelloy G3, Hastelloy N, Hastelloy S, B-2, Hastelloy B-3, Hastelloy C2000, Hastelloy C22 |
| Haynes | Haynes 75, Haynes 244, Haynes 25, Haynes 263, Haynes 282, Haynes 556, Haynes 188, Haynes 230, Haynes 233, Haynes 242 |
| Monel | Monel 400, Monel K-500, Monel R405, Monel 401, Monel 404, Monel 405. |
| Nimonic | Nimonic 91, Nimonic C263, Nimonic PE11, Nimonic PE16, Nimonic PK33, Nimonic 80A, Nimonic 96, Nimonic 90, Nimonic 901, Nimonic 105, Nimonic 115 |
| Other Nickel | Waspaloy, Multimet N155, Mumetal 80, Rene 41, Kovar, Maraging 250, Maraging 300, Maraging 350, MP159, MP35N, Alloy 46, Alloy 48, Alloy 52, Alloy 42, Alloy 45, Cobalt alloy 6b, Custom 455, Invar 36, Invar 42, Nickel 200, Nickel 201 |
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