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Low Expansion Ceramic Seal Expansion Alloys 4J33 Strips 500-1000 MPa
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Low Expansion Ceramic Seal Expansion Alloys 4J33 Strips 500-1000 MPa
  • name

Low Expansion Ceramic Seal Expansion Alloys 4J33 Strips 500-1000 MPa

MOQ: 150kgs
Price: Negotiatable
Standard Packaging: Wooden Crate
Delivery Period: 2-30days
Payment Method: L/C,T/T,Western Union,MoneyGram
Supply Capacity: 300 Ton per Month
Detail Information
Product Description
Detail Information
Place of Origin
China
Brand Name
NikTech
Certification
ISO 9001:2008
Model Number
4J33
Place Of Origin:
China
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
Highlight:

Low Expansion Alloys

,

4J33 Expansion Alloys

,

1000 MPa invar 36

Product Description

4J33 Strips: Low-Expansion Ceramic Seal and Excellent Formability

Product Overview

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.

Chemical Composition

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

Mechanical Properties

Condition Tensile Strength (MPa) Yield Strength (MPa) Elongation (%) Hardness (HB)
Soft (Annealed) < 570 –– 42 ~ 78
Hard (Tempered) > 700 –– –– ––

Physical Properties

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

Conformance Standards

  • 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

Applications

  • 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

Frequently Asked Questions

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.

Tags: 

expansion alloys,  

super invar,  

invar steel

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products
PRODUCTS DETAILS
Products

Monel Alloy

Inconel Alloy

Resistance Alloy

Expansion Alloys

Incoloy Alloy

Hastelloy Alloy

Cobalt Alloy

Soft Magnetic Alloy

Pure Nickel

Stainless Steel

Noble Metal

Nickel Based Welding Products

High Temperature Alloy

Others
Low Expansion Ceramic Seal Expansion Alloys 4J33 Strips 500-1000 MPa
  • name
Low Expansion Ceramic Seal Expansion Alloys 4J33 Strips 500-1000 MPa
MOQ: 150kgs
Price: Negotiatable
Standard Packaging: Wooden Crate
Delivery Period: 2-30days
Payment Method: L/C,T/T,Western Union,MoneyGram
Supply Capacity: 300 Ton per Month
Detail Information
Product Description
Detail Information
Place of Origin
China
Brand Name
NikTech
Certification
ISO 9001:2008
Model Number
4J33
Place Of Origin:
China
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
Minimum Order Quantity:
150kgs
Price:
Negotiatable
Packaging Details:
Wooden Crate
Delivery Time:
2-30days
Payment Terms:
L/C,T/T,Western Union,MoneyGram
Supply Ability:
300 Ton per Month
Highlight

Low Expansion Alloys

,

4J33 Expansion Alloys

,

1000 MPa invar 36

Product Description

4J33 Strips: Low-Expansion Ceramic Seal and Excellent Formability

Product Overview

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.

Chemical Composition

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

Mechanical Properties

Condition Tensile Strength (MPa) Yield Strength (MPa) Elongation (%) Hardness (HB)
Soft (Annealed) < 570 –– 42 ~ 78
Hard (Tempered) > 700 –– –– ––

Physical Properties

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

Conformance Standards

  • 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

Applications

  • 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

Frequently Asked Questions

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.

Tags: 

expansion alloys,

super invar,

invar steel

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