Alloy family
Precision Alloys — Low Expansion, Soft Magnetic, Elastic and Resistance Grades
Precision alloys deliver special physical properties: low-expansion 4J36 (Invar 36) and 4J29 (Kovar), soft magnetic 1J79, elastic 3J1 and resistance alloy 6J22 — used in aerospace, electronic packaging and precision instruments.
Why specify this alloy family
Low expansion
4J36: ≈1.2×10⁻⁶/°C from −80 to 100 °C
Glass sealing
4J29 matches borosilicate glass expansion
Soft magnetic
1J79 offers high permeability and low coercivity
Grades in this family
| Grade | UNS | Density | Tensile | Max service temp. | Detail |
|---|---|---|---|---|---|
| Invar 36 / 4J36 | K93600 | 8.10 g/cm³ | ≥ 440 MPa | −80 ~ +100 ℃ (dimensional stability range) | see Invar 36 / 4J36 data |
| Kovar / 4J29 | K94610 | 8.36 g/cm³ | ≥ 520 MPa | −80 ~ +450 ℃ | see Kovar / 4J29 data |
Select any grade for full chemical composition, mechanical properties, standards and applications.
Grade data sheets
Invar 36 / 4J36UNS K93600 · ≥ 440 MPa tensile · −80 ~ +100 ℃ (dimensional stability range) maxprecision-4j36
Kovar / 4J29UNS K94610 · ≥ 520 MPa tensile · −80 ~ +450 ℃ maxprecision-4j29
Available product forms
Round BarsRound Bars
Seamless Tubes & PipesSeamless Tubes & Pipes
Plates & SheetsPlates & Sheets
Precision StripsPrecision Strips
Forgings & RingsForgings & Rings
Welding Wire & CoilsWelding Wire & Coils
Flanges & Pipe FittingsFlanges & Pipe Fittings
Precision Machined PartsPrecision Machined Parts
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