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 |
| Type | Nickel Strips |
| Hardness | 150-250 HB |
| Brand No | W.Nr 2.0842 |
| Tensile Strength | 550-750 MPa |
| Dia | 0.6mm,0.8mm,0.9mm,1.0mm,1.2mm,1.6mm |
| Testing Facility | Accept third party testing such as SGS |
| Welding Performance | Good |
| Type Of Material | nickel-copper alloys |
| Yield Strength | 240-450 MPa |
| Business Type | Manufaturer |
| Diameter | 0.02 - 1 Mm, 1-3 Mm, 5-7 Mm |
| Electrical Conductivity | 34% IACS |
| Width | 1500mm |
| Brand Name | NikTech |
| Model Number | 4J50 |
| 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 |
| Type | Nickel Strips | Hardness | 150-250 HB |
| Brand No | W.Nr 2.0842 | Tensile Strength | 550-750 MPa |
| Dia | 0.6mm,0.8mm,0.9mm,1.0mm,1.2mm,1.6mm | Testing Facility | Accept third party testing such as SGS |
| Welding Performance | Good | Type Of Material | nickel-copper alloys |
| Yield Strength | 240-450 MPa | Business Type | Manufaturer |
| Diameter | 0.02 - 1 Mm, 1-3 Mm, 5-7 Mm | Electrical Conductivity | 34% IACS |
| Width | 1500mm | Brand Name | NikTech |
| Model Number | 4J50 | Certification | ISO 9001:2008 |
| Place of Origin | China | ||
| High Light | 0.6mm Expansion Alloys ，0.8mm Expansion Alloys ，0.9mm invar steel | ||
Expansion Alloy 4J50 Strips (UNS K94610) are wrought Fe–Ni–Co alloys formulated to match the CTE of soft sealing glasses and ceramics. Their optimized chemistry—Ni 50.5 %, Mn 0.60 %, Si 0.30 %, C 0.05 %, Cr 0.25 %, P 0.025 %, S 0.025 %, Al 0.10 %, Co 1.0 %, balance Fe—yields a stable CTE of 9.8 × 10⁻⁶ /°C from 20 → 100 °C rising gently to 10.6 × 10⁻⁶ /°C at 600 °C, ensuring virtually zero thermal stress in glass-to-metal seals. These strips maintain hermeticity and corrosion resistance in vacuum and mild-atmosphere environments, with a Curie point exceeding 400 °C for magnetic stability. Available in cold-rolled thicknesses from 0.2 mm to 3.5 mm and widths to 300 mm, 4J50 Strips form readily via stamping, slitting, and fine-blanking, producing diaphragms, bellows, feedthroughs, and sensor housings with tight tolerances. Heat-treat per YB/T 5235-2005 (900 °C × 1 h in H₂, controlled cool) to achieve “soft” or “hard” tempers, tailoring tensile strength (< 590 MPa soft; > 700 MPa hard) to application needs.
| Element | Content (%) |
|---|---|
| Nickel (Ni) | 50.5 (nominal) |
| Manganese (Mn) | ≤ 0.60 |
| Silicon (Si) | ≤ 0.30 |
| Carbon (C) | ≤ 0.05 |
| Chromium (Cr) | ≤ 0.25 |
| Phosphorus (P) | ≤ 0.025 |
| Sulfur (S) | ≤ 0.025 |
| Aluminum (Al) | ≤ 0.10 |
| Cobalt (Co) | 1.0 |
| Iron (Fe) | Balance |
| Condition | Tensile Strength (MPa) | Elongation (%) | Hardness (RB) |
|---|---|---|---|
| Soft (annealed) | < 590 | ~ 30 | ~ 73 |
| Hard (tempered) | > 700 | ~ 15–25 | ~ 85 |
| Property | Value |
|---|---|
| Density | 8.20 g/cm³ |
| Melting Range | 1430 °C |
| Thermal Conductivity (25 °C) | ~ 14 W/m·°C |
| Electrical Resistivity (20 °C) | 0.44 µΩ·m |
| Curie Point | ~ 430 °C |
| CTE (20–100 °C) | 9.8 × 10⁻⁶ /°C |
| CTE (20–300 °C) | 9.5 × 10⁻⁶ /°C |
| CTE (20–600 °C) | 10.6 × 10⁻⁶ /°C |
YB/T 5235-2005 – Chinese standard for constant-expansion alloys
ASTM F15 – Controlled-expansion alloys for seals
UNS K94610 / W.No. 1.3981 – Material designation for 4J50
Electric Vacuum Industry: Vacuum tube seals, cathode‐ray feedthroughs
Hermetic Electronic Packages: Power semiconductor housings, sensor feedthroughs
Precision Instrumentation: Bellows, diaphragms, micro-valve components
Aerospace & Defense: High-power RF windows, avionics glass seals
Optoelectronics: LED and laser diode hermetic enclosures
Q1: What temperature range is 4J50 effective for?
A1: Continuous service from –60 °C to 400 °C with a stable CTE; intermittent exposures up to 600 °C maintain hermeticity.
Q2: How is “soft” vs. “hard” temper achieved?
A2: Anneal at 900 °C for 1 h in H₂, then cool ≤ 5 °C/min to 200 °C for “soft”; age or cold-work plus re-anneal yields “hard” (> 700 MPa tensile).
Q3: Can 4J50 Strips be welded to Kovar or stainless?
A3: Yes—TIG/GTAW and electron-beam methods join 4J50 to similar alloys and stainless steels without altering CTE or hermetic seal performance.
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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