Chemical composition
Nominal: elements given only as a maximum are counted at the cap; the balance takes the remainder.
| Element | Name | Content % | |
|---|---|---|---|
| Main elements3 elements | |||
| Fe | Iron | Bal. | |
| Ni | Nickel (nominal) | 32% | |
| Co | Cobalt (nominal) | 5% | |
| Element | Name | Content % | |
|---|---|---|---|
| Minor & residual6 elements | |||
| Mn | Manganese | ≤ 0.6% | |
| Si | Silicon | ≤ 0.25% | |
| C | Carbon | ≤ 0.05% | |
| Cr | Chromium | ≤ 0.25% | |
| P+S | Phosphorus + sulfur, total | ≤ 0.025% | |
| Al+Mg+Ti+Zr | Aluminium + magnesium + titanium + zirconium, total | ≤ 0.2% | |
Mechanical minima by form
Guaranteed values differ by form, size and delivery condition; quotations confirm the specification, form, size and condition.
| Form | Condition | Rm MPa | Rp0.2 MPa | A ≥ % | Other requirements and notes |
|---|---|---|---|---|---|
| Plate | Annealed | ≥ 400 (58 ksi) | ≥ 230 (33 ksi) | — | Also specified: Hardness 60 HRB – 85 HRB |
| Strip and sheet | Annealed at Temper A | — | — | — | |
| Strip and sheet | Temper B, half hard | ≥ 593 (86 ksi) | — | — |
Where this grade is recommended
Matched in 2 service conditions; ranks and scores computed from the condition-scoring matrix.
| Service condition | Industry | Temperature | Rank | Score |
|---|---|---|---|---|
| Metrology & precision structures | Semiconductor & Vac-Electronics | Controlled 20 °C | 1 / 4 | 94 |
| LNG containment & cryogenics | Marine & Offshore | ≤ 40 °C | 2 / 4 | 82 |
Designations & equivalents
| Trade name(s) | Super Invar / Inovco / 32-5 |
| GOST (Russia) | ≈ 32НКД |
Cross-references are common near-equivalents for search and shortlisting; substitution across standards requires clause-by-clause verification. All grades in one cross-reference table →
Applicable standards
Name the standard and its edition on the order.
Frequently asked questions
What is Super Invar 4J32?
Super Invar 4J32 — Precision alloys. Lower expansion than Invar near room temperature — optical benches and laser cavities
What is the maximum service temperature of 4J32?
Typically about 250 °C; the practical limit depends on media, stress and design life — acceptance per the governing standard.
What is the tensile strength of 4J32?
The specified minimum tensile strength is 400 MPa for the main product form. Minima for other forms and sizes are listed under "Mechanical minima by form" on this page.
Which standards cover 4J32?
ASTM F1684
Where is 4J32 typically used?
Metrology & precision structures (Semiconductor & Vac-Electronics); LNG containment & cryogenics (Marine & Offshore)
In which forms is 4J32 available?
Tube, plate, strip, bar, forgings, wire and other forms — sizes and delivery condition confirmed per order, with EN 10204 3.1 / 3.2 certification.
Same series
Download PDF datasheet
This grade’s datasheet as an A4 PDF — for filing, printing or forwarding to colleagues.
Download PDF datasheetSupply & enquiry
Tube & pipeφ1 – 219 × 0.25 – 25 mm
Plate4.76 – 80 mm
Barφ8 – 300 mm
Wire & filler metalsφ0.01 – 8 mmFor this grade we can supply, against your service conditions:
- Tube, plate, strip, bar, forgings, wire and more — with size range and lead time
- Chemistry and mechanical test report (EN 10204 3.1 / 3.2)
- Like-for-like alternatives and selection advice
- Applicable standards and inspection scope
Or email us: info@kochlin.com