Wuxi Nickel Alloy New Material Technology Co., Ltd
| Payment Terms | L/C,T/T,Western Union,MoneyGram |
| Supply Ability | 300 Ton per Month |
| Delivery Time | 2-30days |
| Packaging Details | Wooden Crate |
| Composition | Nickel, Iron, Cobalt, Manganese, Silicon |
| Electrical Resistivity | 0.1-0.2 μΩm |
| Elongation | 10-20% |
| Magnetic Properties | Ferromagnetic |
| Availability | Available in various forms such as sheets, plates, rods, wires, and tubes |
| Hardness | 150-250 HV |
| Thermal Expansion Coefficient | 6-18 x 10^-6/K |
| Tensile Strength | 500-1000 MPa |
| Density | 8.0 g/cm3 |
| Melting Point | 1300-1400°C |
| Applications | Thermometers, Thermostats, Bimetallic Strips, Metal Bellows |
| Thermal Conductivity | 10-20 W/mK |
| Brand Name | NikTech |
| Model Number | 4J33 |
| Certification | ISO 9001:2008 |
| Place of Origin | China |
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Product Specification
| Payment Terms | L/C,T/T,Western Union,MoneyGram | Supply Ability | 300 Ton per Month |
| Delivery Time | 2-30days | Packaging Details | Wooden Crate |
| Composition | Nickel, Iron, Cobalt, Manganese, Silicon | Electrical Resistivity | 0.1-0.2 μΩm |
| Elongation | 10-20% | Magnetic Properties | Ferromagnetic |
| Availability | Available in various forms such as sheets, plates, rods, wires, and tubes | Hardness | 150-250 HV |
| Thermal Expansion Coefficient | 6-18 x 10^-6/K | Tensile Strength | 500-1000 MPa |
| Density | 8.0 g/cm3 | Melting Point | 1300-1400°C |
| Applications | Thermometers, Thermostats, Bimetallic Strips, Metal Bellows | Thermal Conductivity | 10-20 W/mK |
| Brand Name | NikTech | Model Number | 4J33 |
| Certification | ISO 9001:2008 | Place of Origin | China |
| High Light | Low Expansion Alloys ，4J33 Expansion Alloys ，1000 MPa invar 36 | ||
Expansion Alloy 4J33 Strips (UNS K94610) are wrought iron-nickel-cobalt alloys tailor-made for glass-to-metal and ceramic-to-metal sealing. Their precise chemistry—32.1–33.6 % Ni and 14.0–15.2 % Co, with C, P, S ≤ 0.05 %—creates a CTE of 6.3 × 10⁻⁶ /°C (20–400 °C) to 8.5 × 10⁻⁶ /°C (20–600 °C), closely matching 95 % Al₂O₃ ceramics and minimizing thermal mismatch stresses. In the annealed “soft” delivery condition, 4J33 Strips achieve tensile strengths < 570 MPa and yield strengths commensurate with high-integrity seals; a “hard” temper raises tensile strength > 700 MPa for demanding structural applications. Exceptional elongation (up to 42 %) and hardness (~ 78 HB) enable fine blanking, deep drawing, and stamping of diaphragms, bellows, and precision feedthrough parts. Physical stability is assured by a melting range near 1450 °C, density of 8.27 g/cm³, thermal conductivity of 17.6 W/m·°C, and resistivity of 0.46 µΩ·m. Supplied in cold-rolled gauges (0.1–3.5 mm thick, widths up to 300 mm), these strips meet ASTM F15 (controlled-expansion alloys) and UNS K94610 specifications, serving global markets from vacuum-tube manufacturing to implantable medical devices.
| Element | Content (%) |
|---|---|
| Nickel (Ni) | 32.1 – 33.6 |
| Cobalt (Co) | 14.0 – 15.2 |
| Carbon (C) | ≤ 0.05 |
| Phosphorus (P) | ≤ 0.02 |
| Sulfur (S) | ≤ 0.02 |
| Manganese (Mn) | ≤ 0.50 |
| Silicon (Si) | ≤ 0.30 |
| Iron (Fe) | Balance |
| Condition | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness (HB) |
|---|---|---|---|---|
| Soft (Annealed) | < 570 | –– | 42 | ~ 78 |
| Hard (Tempered) | > 700 | –– | –– | –– |
| Property | Value |
|---|---|
| Density | 8.27 g/cm³ |
| Melting Point | ~ 1450 °C |
| Thermal Conductivity (25 °C) | 17.6 W/m·°C |
| Electrical Resistivity (25 °C) | 0.46 µΩ·m |
| Mean CTE (–60 °C–600 °C) | 6.3–8.5 × 10⁻⁶/°C |
| Curie Point | 430 °C |
ASTM F15 – Controlled-expansion alloy strip
UNS K94610 / W. Nr. 1.3981 – Alloy designation
YB/T 5231-2005 – Chinese sealing alloy standard
DIN EN 601 – Ceramic-sealed alloy specifications
Vacuum & Electronic Packaging – Hermetic feedthroughs, vacuum tube envelopes
Aerospace Instruments – Engine sensor seals, satellite components
Medical Devices – Implantable sensor housings, surgical instrument seals
Industrial Sensors – High-precision pressure and temperature transducers
Lighting & Photonics – Flash-lamp and photomultiplier tube bases
Q1: How closely does 4J33 match ceramic CTE?
A1: 4J33 Strips exhibit a mean linear CTE of 6.3 × 10⁻⁶/°C (20–400 °C) to 8.5 × 10⁻⁶/°C (20–600 °C), matching 95 % Al₂O₃ within ± 0.2 × 10⁻⁶/°C.
Q2: Can 4J33 be welded or brazed?
A2: Yes—TIG, electron-beam welding, and active brazing alloys achieve hermetic bonds to Kovar, Invar, and stainless substrates without altering expansion properties.
Q3: What form factors are available?
A3: Cold-rolled strip in 0.1–3.5 mm thickness and up to 300 mm width; custom gauge, width, and finish per ASTM F15 and YB/T 5231 standards.
Company Details
Business Type:
Manufacturer
Year Established:
2002
Total Annual:
20000000-80000000
Employee Number:
50~500
Ecer Certification：
Verified Supplier
Wuxi Nickel New Material Co., Ltd. is a high-tech enterprise integrating the production, manufacturing, and research & development of specialty alloy materials. Located in Wuxi, Jiangsu Province, the company specializes in precision alloys, titanium alloys, high-temperature alloys, corrosion-res... Wuxi Nickel New Material Co., Ltd. is a high-tech enterprise integrating the production, manufacturing, and research & development of specialty alloy materials. Located in Wuxi, Jiangsu Province, the company specializes in precision alloys, titanium alloys, high-temperature alloys, corrosion-res...
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