Alloy 52 Strip
Alloy 52 Strip is a specialized,thin,flat-rolled form of Alloy 52,which is a controlled expansion nickel-iron alloy.Composed of approximately 50.5% to 51% nickel with the remaining balance being iron,it is highly engineered to exhibit a virtually constant coefficient of thermal expansion up to approximately 1050°F (565°C).
This specific dimensional stability prevents stress fractures,making it the industry standard for creating reliable,hermetic glass-to-metal and ceramic-to-metal seals.
Key Material Properties
- Controlled Thermal Expansion:
Matches the expansion rate of specific soft glasses (like potash-soda-lead glass) and ceramics. - Standards Compliance:
It is manufactured to meet industry standard specifications,primarily ASTM F30 and SAE AMS-I-23011 Class 2. - Physical Characteristics:
Features a high density of ~8.3 g/cm³,good magnetic properties,and a melting point around 1430°C–1450°C. - Excellent Ductility:
The strip form allows it to be easily stamped,formed,deep-drawn,or etched into intricate electronic parts.
Applications of Alloy 52 Strip
- Consumer Electronics
- Semiconductor Industry
- Micrographics Processing
- Aerospace Engineering
- Defense Contracting
- Satellite Manufacturing
- Avionics Systems
- Missile Development
- Medical Equipment
- Industrial Automation
- Vacuum Technology
- Lighting Infrastructure
We offer Alloy 52 strips and coils in thicknesses of 0.1 – 100.We offer not only stainless steel strips but also precision strips made of Hastelloy, Incoloy, Inconel, Monel, and other high-performance alloys.Our products comply with ASTM F1684, EN 10204, ISO 9001, PED 2014/68/EU, CE,and other standards.With over a decade of experience in manufacturing and import/export,we are your best wholesaler in China.
Chemical Composition of Alloy 52 Strip
Alloy 52 is a binary nickel-iron alloy with a highly controlled chemistry designed to match the thermal expansion characteristics of soft glasses and ceramics.The nominal chemical composition breakdown according to ASTM F30 standards is as follows:
| Ni | Fe | Mn | Si | C | Cr | Co | P | S | Al |
|---|---|---|---|---|---|---|---|---|---|
| 50.5 – 51.5 | Balance | ≤ 0.60 | ≤ 0.30 | ≤ 0.05 | ≤ 0.25 | ≤ 0.50 | ≤ 0.025 | ≤ 0.025 | ≤ 0.10 |
Why The Precision Matters
The primary purpose of Alloy 52 is its precise CTE.
Even a 0.5% variance in the Nickel content can radically shift the CTE inflection point.
Strictly controlling trace elements ensures the alloy expands and contracts at the exact same rate as potash-soda-lead glass during heating and cooling cycles,preventing hermetic seal failures.
Even a 0.5% variance in the Nickel content can radically shift the CTE inflection point.
Strictly controlling trace elements ensures the alloy expands and contracts at the exact same rate as potash-soda-lead glass during heating and cooling cycles,preventing hermetic seal failures.
The Role of Trace Elements
- Manganese & Silicon:
Act as deoxidizers during the melting phase to improve de-gassing and clean the crystal lattice structure. - Carbon:
Kept extremely low to prevent the formation of internal carbides,which cause brittleness and disrupt magnetic uniformity. - Sulfur & Phosphorus:
Classified as harmful impurities;keeping them near zero prevents “hot shortness” (cracking during hot rolling of the strip).
Composition VS Competitors
- Alloy 42 Strip (UNS K94100):
Contains 42% Nickel,designed for hard borosilicate glasses. - Kovar Plate (UNS K94610):
Contains 29% Nickel + 17% Cobalt,explicitly designed for thermal matching with alumina ceramics and pyrex glass. - Invar 36 Strip (UNS K93600):
Contains 36% Nickel,formulated for near-zero expansion at room temperature rather than glass sealing.
Alloy 52 Strip Standards & Equivalent Designations
| Alloy 52 Strip (Controlled Expansion) | |||||
|---|---|---|---|---|---|
| Standard / System | Equivalent Designation | Product Form | GB (China) | GJB (Military) | GOST (Russia) |
| Chinese Standard | 4J52 (Fe-Ni52) | Plates, Sheets & Strips | GB/T 15018 | GJB 1952A | – |
| Russian / CIS Standard | 52N / 52H (52Н) | Bars & Rods | GB/T 14985 | – | GOST 10994 / 14080 |
| ISO Chemical Name | Ni52 / FeNi52 | Seamless Pipes & Tubes | – | – | – |
| UNS System | UNS N14052 / K95050 | Welded Pipes & Tubes | – | – | – |
| Aviation / Aerospace | ASTM F30 / Werkstoff 2.4475 | Forgings & Rings | – | – | – |
| UK Designation | NILO Alloy 52 / Pernifer 50 | ||||
| Generic Trade Name | Alloy 52, Glass Sealing 52 | ||||
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Kaysuns is a professional supplier of Alloy 52 Strips.Please feel free to contact me if you have any requirements.
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Mechanical Properties of Alloy 52 Strip
The mechanical properties of Alloy 52 strip are highly dependent on the material’s temper condition,which ranges from fully annealed to full-hard.This adaptability allows manufacturers to choose the right balance between formability for stamping and structural rigidity for final components.
| Mechanical Property | Annealed Temper (Soft) | Hard Temper (Cold Rolled) |
|---|---|---|
| Tensile Strength | 450 – 550 MPa (65 – 80 ksi) | ≥ 700 MPa (≥ 101 ksi) |
| Yield Strength | 240 – 350 MPa (35 – 50 ksi) | ≥ 620 MPa (≥ 90 ksi) |
| Elongation | 25% – 35% | ≤ 5% |
| Hardness | 70 – 82 HRB | ≥ 95 HRB |
| Modulus of Elasticity | 140 GPa (20.3 × 10⁶ psi) | 140 GPa (20.3 × 10⁶ psi) |
| Poissons Ratio | 0.29 | 0.29 |
Formability and Workability
- Deep Drawing and Stamping:
In its annealed state,Alloy 52 strip exhibits exceptional ductility.This makes it perfectly suited for high-speed automated progressive stamping presses,severe forming,and deep drawing into miniature cap,cup,or eyelet configurations for electronic packages. - Work Hardening:
Like most nickel-iron formulations,Alloy 52 work-hardens rapidly during cold reduction.This property is heavily exploited when slicing or punching lead frames,where structural rigidity and crisp edges are mandatory to prevent lead deformation.
Heat Treatment & Property Recovery
- Stress Relieving:
After stamping or punching operations,cold-working stresses can alter the strip’s microstructural stability and distort its precise thermal expansion parameters.Inter-stage or post-form stress relieving is usually executed at approximately 760°C to 870°C in a protective hydrogen atmosphere. - Full Annealing:
To reset the mechanical properties back to the softest matrix for subsequent operations,a full anneal is conducted at 850°C to 1000°C for up to 1 hour, followed by controlled cooling.
Machinability Profiles
- Gummy Matrix:
Because of the high nickel content,the alloy behaves like austenitic stainless steel when subjected to edge trimming or slitting.It tends to be tough and “gummy.” - Tool Wear Mitigation:
Sharp tooling edges,high-speed cobalt or carbide tool steel,and heavy continuous lubrication are critical when processing Alloy 52 strip to avoid premature burring,tearing,or severe tool wear.
Mechanical Stability at Elevated Temperatures
- Curie Point Inflection:
The mechanical integrity and dimensional stability remain highly linear up to its Curie temperature (450°C / 842°F). - Above this thermal point,the magnetic orientation degrades, resulting in altered mechanical elasticity and structural stiffness coefficients.This must be carefully mapped out if the final electronic application involves sustained high-temperature thermal cycling.
Our Advantages in Manufacturing Alloy 52 Strip
Ultra-Precise Chemistry Control
We use VIM and ESR melting to control nickel content within a tight ±0.2% margin.This guarantees an exceptionally stable and predictable thermal expansion rate across all batches.By reducing impurities like carbon and sulfur to near zero,we prevent micro-cracks and vacuum leaks during high-temperature glass-to-metal bonding.
Superior Surface Integrity
Our cold-rolling process ensures a flawless finish completely free of scratches,pits,or defects.The strip surface is specially treated to promote a uniform,tightly adherent oxide layer during pre-oxidation.With clean,deburred edges,our material ensures smooth feeding and zero jamming in automated stamping presses.
Tailored Mechanical Tempers
We engineer custom tempers ranging from deep-draw annealed (70 HRB) to high-rigidity full hard (≥ 95 HRB).The high elongation of our soft temper prevents localized tearing during complex,multi-stage stamping.Protective atmosphere annealing eliminates internal stresses,keeping the strip perfectly flat and workable.
Dimensional Accuracy Mastery
Advanced Automatic Gauge Control systems keep thickness tolerances within micro-level variations.Tension-leveling technology eliminates common defects like edge waves,center buckles,and lateral camber.These strict geometric tolerances maximize your material yield and drastically reduce stamping tool wear.
FAQs About Alloy 52 Strip
Heat-treating in a damp hydrogen atmosphere is critical for pre-oxidation.The process removes residual carbon and allows trace manganese and iron to form a uniform,tightly adherent surface oxide layer.When sealing,molten glass flows into this micro-porous oxide structure,creating the actual molecular hermetic bond.
It is generally available in tempers ranging from Annealed (Soft) to Full Hard:
- Annealed (~70 HRB, ~30% elongation):
Ideal for deep-drawing,bending,and complex progressive stamping without tearing. - Full Hard (≥95 HRB):
Ideal for flat components like lead frames or reed switches that require high structural rigidity and crisp,burr-free stamped edges.
The Curie temperature of Alloy 52 is approximately 450°C (842°F).Below this inflection point,the material maintains its signature controlled thermal expansion profile.Above 450°C,the alloy loses its magnetic properties,causing the rate of thermal expansion to increase significantly.Engineers must factor this inflection into high-temperature designs.
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