logo
products
PRODUCTS DETAILS
Home > Products >
4J50 Expansion Alloys 590–700 MPa Tensile Excellent Formability Thermal Stability
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
Contact Us
Contact Now
4J50 Expansion Alloys 590–700 MPa Tensile Excellent Formability Thermal Stability
  • name

4J50 Expansion Alloys 590–700 MPa Tensile Excellent Formability Thermal Stability

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
4J50
Place Of Origin:
China
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
Highlight:

0.6mm Expansion Alloys

,

0.8mm Expansion Alloys

,

0.9mm invar steel

Product Description

4J50 Strips: 590–700 MPa Tensile and Excellent Formability and Thermal Stability

Product Overview

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.

Chemical Composition

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

Mechanical Properties

Condition Tensile Strength (MPa) Elongation (%) Hardness (RB)
Soft (annealed) < 590 ~ 30 ~ 73
Hard (tempered) > 700 ~ 15–25 ~ 85

Physical Properties

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

Conformance Standards

  • 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

Applications

  • 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

Frequently Asked Questions

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.

Tags: 

expansion alloys,  

super invar,  

invar steel

Recommended Products
4J29 Expansion Alloys Precision Expansion Control And Vacuum Seal

4J29 Expansion Alloys Precision Expansion Control And Vacuum Seal

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

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

Contact Now
4J50 Expansion Alloys 590–700 MPa Tensile Excellent Formability Thermal Stability

4J50 Expansion Alloys 590–700 MPa Tensile Excellent Formability Thermal Stability

Contact Now
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
4J50 Expansion Alloys 590–700 MPa Tensile Excellent Formability Thermal Stability
  • name
4J50 Expansion Alloys 590–700 MPa Tensile Excellent Formability Thermal Stability
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
4J50
Place Of Origin:
China
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
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

0.6mm Expansion Alloys

,

0.8mm Expansion Alloys

,

0.9mm invar steel

Product Description

4J50 Strips: 590–700 MPa Tensile and Excellent Formability and Thermal Stability

Product Overview

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.

Chemical Composition

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

Mechanical Properties

Condition Tensile Strength (MPa) Elongation (%) Hardness (RB)
Soft (annealed) < 590 ~ 30 ~ 73
Hard (tempered) > 700 ~ 15–25 ~ 85

Physical Properties

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

Conformance Standards

  • 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

Applications

  • 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

Frequently Asked Questions

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.

Tags: 

expansion alloys,

super invar,

invar steel

Quick Link
Home products About Us Video news Cases Contact Us
Quick Contact

Address

Xinwu District, Wuxi City, Jiangsu Province

Tel

86--15312263955

NikTechMaterial
Our Newsletter
Subscribe to our newsletter for discounts and more.
Privacy Policy |  Sitemap  | China Good Quality Monel Alloy Supplier. Copyright © 2025 Wuxi Nickel Alloy New Material Technology Co., Ltd . All Rights Reserved.