Ohmalloy Material Co.,Ltd
| Payment Terms | T/T, L/C, |
| Packaging Details | Wooden-Case |
| Material | Alloy52 |
| Type of Material | Precision Alloy |
| Diameter | 0.05mm~10mm |
| Package | Spool&Coil |
| Coil Weight | 5~50kg |
| Common name | FeNi52 |
| Application | Glass Metal Seal |
| Chemistry | Fe,Ni Alloy |
| Alloy type | Expansion Alloy |
| Brand Name | OHMALLOY |
| Model Number | Ohmalloy-FeNi52 |
| Certification | ASTM F30 |
| Place of Origin | China |
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Product Specification
| Payment Terms | T/T, L/C, | Packaging Details | Wooden-Case |
| Material | Alloy52 | Type of Material | Precision Alloy |
| Diameter | 0.05mm~10mm | Package | Spool&Coil |
| Coil Weight | 5~50kg | Common name | FeNi52 |
| Application | Glass Metal Seal | Chemistry | Fe,Ni Alloy |
| Alloy type | Expansion Alloy | Brand Name | OHMALLOY |
| Model Number | Ohmalloy-FeNi52 | Certification | ASTM F30 |
| Place of Origin | China |
4J52 Hermetic Sealing Tube CTE 7.6*10^(-6)/°C AS9100 Compliant
Property Value Standard
Composition Ni 51.5±0.3%, Cr 0.15±0.05%, Mn 0.8%, Si 0.15%, Bal. Fe ASTM F30
CTE (20-450°C) 9.9±0.2x10^(-6)/K ASTM E228
Glass Matching Range 8.8-10.5×10^(-6)/K (DW-30 to Corning 7052) ISO 3585
Sealing Temperature 850-1000°C (H2 atmosphere) MIL-STD-889
Leak Rate Performance <1×10^(-11) mbar·L/s (He) ASTM E493
Region Standard Designation
Aerospace AS9100 Rev. D -
USA ASTM F30 UNS K94610
Europe EN 10305-4 FeNi52
Medical ISO 13485 -
Vacuum ASTM E493 Hermetic Seals
Thermal Expansion Control:
Microstructural Requirements:
Glass Type CTE (×10^(-6)/°C) Matched Alloy 52 Variant
Corning 7052 (Borosilicate) 4.6 Ni 52% (Standard)
Schott 8250 9.9 Ni 51.5%
DW-30 (Tungsten Seal) 10.5 Ni 53%
Alumina Ceramic (96%) 6.8 Ni 50% + Cu modifier
Normal composition%
| Ni | 51.5~52.5 | Fe | Bal. | Co | - | Si | ≤0.3 |
| Mo | - | Cu | - | Cr | - | Mn | ≤0.8 |
| C | ≤0.05 | P | ≤0.02 | S | ≤0.02 |
Typical Physical properties
| Density (g/cm3) | 8.25 |
| Electrical resistivity at 20ºC(ohm.mm2/m) | 0.43 |
| Temperature factor of resistivity(20ºC~200ºC)X10-6/ºC | 9.8~11 |
| Thermal conductivity, λ/ W/(m*ºC) | 16.7 |
| Curie point Tc/ ºC | 520 |
| Elastic Modulus, E/ Gpa | 144 |
Coefficient of expansion
| θ/ºC | α1/10-6ºC-1 | θ/ºC | α1/10-6ºC-1 |
| 20~-60 | 20~100 | 10.3 | |
| 20~-40 | 20~200 | 10.4 | |
| 20~-20 | 20~300 | 10.2 | |
| 20~-0 | 20~350 | 10.3 | |
| 20~50 | 20~400 | 10.3 | |
| 20~100 | 20~450 | 10.3 | |
| 20~150 | 20~500 | 10.3 | |
| 20~200 | 20~600 | 10.8 |
| Tensile Strength | Elongation |
| Mpa | % |
| 641 | 14 |
| 689 | 9 |
| 731 | 8 |
| 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 | In protective media and heated to 830 ºC, hold 20min. ~ 1h, quench Due to the stress generated by quenching, heated to 315ºC,hold 1~4h. |
| Precautions | Can not be hardened by heat treatment, Surface treatment can be sandblasting, polishing or pickling. Alloy can be used 25% hydrochloric acid pickling solution at 70 ºC to clear oxidized surface |
Grain size of Alloy52
The grain size of the alloy deep-drawing belt should not be less than level 7, and the grain size less than level 7 should not exceed 10% of the area. When the average grain size of the strip with a thickness of less than 0.13mm is estimated, the number of grains along the thickness of the strip should be no less than 8.
Welding performance of Alloy52
The combined gold has good welding performance and can be brazed and spot welded. The combination of gold and soft glass should be pre-oxidized before sealing.
Coefficient of Expansion
| Alloy | Linear Coefficient of Thermal Expansion a,10-6/°C | |||||||
| 20-200°C | 20-300°C | 20-350°C | 20-450°C | 20-500°C | 20-600°C | 20-700°C | 20-800°C | |
| Kovar | 10.4 | 10.2 | 10.3 | 10.3 | 10.3 | 10.8 | / | / |
Heat Treatment For Alloy52
(1) Stress relief annealing In order to eliminate the residual stress of parts after machining, stress relief annealing is required: 430~540℃, heat preservation 1~2h, furnace cooling or air cooling. [1]
(2) Intermediate annealing In order to eliminate the work hardening phenomenon caused by the alloy in the process of cold rolling, cold drawing and cold stamping, in order to facilitate the continued processing. The workpiece needs to be heated to 700~800℃ in a vacuum or protective atmosphere for 30~60min, then furnace cooled, air cooled or water quenched.
(3) Pre-oxidation treatment When the combined gold is used as a sealing material, it should be pre-oxidized before sealing. A uniform and dense oxide film is formed on the surface of the alloy. The parts are heated in saturated wet hydrogen at 1100°C for 30 minutes, and then oxidized in the air at about 800°C for 5-10 minutes. The weight gain of the parts should be 0.1~0.3mg/cm2
Company Details
Business Type:
Manufacturer,Distributor/Wholesaler,Exporter,Trading Company
Year Established:
2008
Total Annual:
4000000-6000000
Employee Number:
20~50
Ecer Certification：
Verified Supplier
Ohmalloy Material Co.,Ltd is a high-tech enterprise which specialized in making all kinds of alloy such as high resistance alloy, low-resistance copper nickel alloy, precision alloy, FeCrAl alloy and thermocouple Alloy. Ohmalloy Material Co.,Ltd have a full production line from melting, surface... Ohmalloy Material Co.,Ltd is a high-tech enterprise which specialized in making all kinds of alloy such as high resistance alloy, low-resistance copper nickel alloy, precision alloy, FeCrAl alloy and thermocouple Alloy. Ohmalloy Material Co.,Ltd have a full production line from melting, surface...
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