Understanding the 1J36 vs 4J36 comparison helps engineers choose the right nickel-iron alloy for critical projects.Both materials contain approximately 36% nickel and 64% iron.Because of this shared base metal,suppliers often call both materials Invar 36.However,their internal standards target completely different physical properties.One alloy optimizes low thermal expansion rate.The other alloy optimizes soft magnetic permeability.
What Is Invar 36 And Why The Overlap?
Invar 36 is a famous 36% nickel-iron alloy known for minimal thermal expansion.Swiss physicist Charles Édouard Guillaume invented this unique alloy family in 1896.Near room temperature,the alloy maintains nearly constant physical dimensions.
Chinese industrial standards use two separate letter prefixes for this 36% nickel alloy family.The prefix “4J” signifies a precision expansion alloy.4J36 focuses strictly on maintaining an extremely low coefficient of thermal expansion.The prefix “1J” signifies a soft magnetic alloy.Thus,1J36 focuses primarily on magnetic permeability and low hysteresis loss.Both alloys share a similar 36% nickel core composition.Traders frequently market both materials under the general trade name Invar 36.
1J36 VS 4J36:Chemical Composition
Small chemical variation creates massive functional differences between these two alloys.Both grades maintain a primary nickel content between 35% and 37%.Iron makes up the remaining balance for both standard materials.
However,4J36 enforces tighter limits on trace elements like carbon and silicon.Controlling these elements ensures reliable thermal stability across broad temperature ranges.In contrast,1J36 allows subtle trace adjustments to enhance magnetic domain alignment.We provide MTRs for both of these materials to ensure compliance with your local laws and regulations.
| Alloy Standard | Ni | C | Si | Minnesota | Fe |
|---|---|---|---|---|---|
| 4J36 (GB/T 15018) | 35.0 – 37.0 | ≤ 0.05 | ≤ 0,30 | 0.20 – 0.60 | Equilibrio |
| 1J36 (GB/T 15001) | 35.0 – 37.0 | ≤ 0.05 | ≤ 0,30 | 0,30 – 0,60 | Equilibrio |
| Invar 36 (UNS K93600) | 35.0 – 37.0 | ≤ 0.05 | ≤ 0,35 | ≤ 0.60 | Equilibrio |
1J36 VS 4J36:Mechanical And Physical Properties
Examining physical properties reveals the true 1J36 vs 4J36 technical difference.The coefficient of thermal expansion remains the primary benchmark for 4J36.Between 20°C and 100°C, 4J36 maintains a tiny CTE below 1.5 x 10⁻⁶ /°C.This near-zero expansion prevents structural warping in precision scientific instruments.
Meanwhile,1J36 exhibits superior magnetic permeability under alternating electromagnetic fields.Its magnetic Curie point sits at roughly 230°C.Below this temperature,1J36 provides predictable magnetic induction for sensitive electronic sensors.Both materials offer moderate tensile strength and high ductility.
| Property Metric | 4J36 Low Expansion Alloy | 1J36 Soft Magnetic Alloy | Invar 36 (UNS K93600) |
|---|---|---|---|
| Density (g/cm³) | 8.10 | 8.12 | 8.11 |
| CTE (20°C – 100°C) | ≤ 1.5 × 10⁻⁶ /°C | ≤ 2.5 × 10⁻⁶ /°C | ≤ 1.2 × 10⁻⁶ /°C |
| Resistencia a la tracción (MPa) | 490 – 620 | 450 – 580 | 490 – 620 |
| Límite elástico (MPa) | ≥ 240 | ≥ 220 | ≥ 240 |
| Curie Temperature | 230°C | 230°C | 230°C |
| Primary Testing Focus | Thermal Dimensional Stability | Initial Magnetic Permeability | Thermal Dimensional Stability |
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1J36 VS 4J36:Primary Industrial Applications
Selecting the correct grade depends entirely on your specific end-use environment.Aerospace manufacturers rely heavily on 4J36 for composite forming molds.The carbon fiber composites match the expansion rate of 4J36 perfectly.Furthermore,cryogenic liquid gas tanks use 4J36 to avoid thermal stress fractures.
Conversely,electrical equipment manufacturers prefer 1J36 for electromagnetic shields.Precision relays and magnetic transformers require the specialized magnetic response of 1J36.
| Sector industrial | Aleación recomendada | Typical Component Type | Primary Engineering Goal |
|---|---|---|---|
| Aerospace & Defense | 4J36 | Satellite mounts and laser optics | Eliminate thermal deformation |
| Cryogenic Storage | 4J36 | Liquefied gas piping and tanks | Maintain structural integrity at low temperatures |
| Electronics & Instrumentation | 1J36 | Magnetic shielding and relay cores | Maximize magnetic flux performance |
| Composite Manufacturing | 4J36 | Layup tooling and forming dies | Match composite expansion coefficient |
How To Select A 1J36 Plate Or 4J36 Plate
Material buyers must specify the exact standard designation when placing factory orders.Ordering a 1J36 plate works best for electronic shielding enclosures and magnetic cores.The manufacturing process for a 1J36 plate includes specialized magnetic annealing treatments.
On the other hand,purchasing a 4J36 plate suits aerospace tooling and optical benches.A high-quality 4J36 plate delivers consistent low thermal expansion across large surface areas.Always request mill test certificates showing exact chemical analysis and physical test data.Working with certified suppliers ensures your factory receives fully tested raw materials.
1J36 VS 4J36 Technical FAQs
You can substitute them if your project only requires basic low thermal expansion.But 1J36 may not meet strict aerospace expansion tolerances.
Both alloys rely on the exact same 36% nickel and iron atomic lattice.Their magnetic state transition occurs at the same temperature.
Water quench 4J36 at 830°C,followed by artificial aging at 315°C.Heat treat 1J36 in a hydrogen atmosphere to maximize magnetic permeability.
Use sharp carbide cutting tools with heavy liquid coolant continuously.Low speed and steady feed rates prevent severe work hardening during machining.
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