Chemical composition
Nominal: elements given only as a maximum are counted at the cap; the balance takes the remainder.
| Element | Name | Content % | |
|---|---|---|---|
| Main elements2 elements | |||
| Fe | Iron | Bal. | |
| Ni | Nickel (nominal) | 36% | |
| Element | Name | Content % | |
|---|---|---|---|
| Minor & residual8 elements | |||
| Co | Cobalt | ≤ 0.5% | |
| Mn | Manganese | ≤ 0.6% | |
| Si | Silicon | ≤ 0.4% | |
| C | Carbon | ≤ 0.05% | |
| Cr | Chromium | ≤ 0.25% | |
| P | Phosphorus | ≤ 0.015% | |
| S | Sulphur | ≤ 0.015% | |
| 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, sheet and strip | |||||
| 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) | — | — | |
| Several forms | |||||
| Wire and bar | Annealed at Temper A | — | — | — | |
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 |
|---|---|---|---|---|
| LNG containment & cryogenics | Marine & Offshore | Cryogenic −163 °C | 1 / 4 | 95 |
| Metrology & precision structures | Semiconductor & Vac-Electronics | Controlled 20 °C | 2 / 4 | 90 |
Designations & equivalents
| UNS | K93600 |
| W.Nr. (Germany) | 1.3912 |
| EN designation | FeNi36 |
| Trade name(s) | Invar 36 / Nilo 36 / Pernifer 36 / Dilver P1 |
| ASTM / AISI | ASTM F1684 |
| GOST (Russia) | ≈ 36Н |
Do not mix UNS K93603 and K93600 — order to the number on your drawing or contract.
More detail 1
The data on this page follow ASTM F1684, UNS K93603; Invar 36 is often listed elsewhere as K93600.
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
2 specifications. Name the standard and its edition on the order.
Under ASTM F1684 the key acceptance item is the mean coefficient of thermal expansion from 30 to 150 °C: 1.2–2.7 µm/(m·K) — a result below the lower limit also fails.
More detail 1
Invar's low expansion holds only up to about 200 °C; above that the coefficient rises quickly.
Guaranteed values and required tests differ between specifications — see Mechanical minima by form for the figures per form.
Frequently asked questions
What is Invar 36 (4J36)?
Invar 36 (4J36) — Precision alloys. Near-zero expansion — LNG containment, precision gauges, composite tooling
What is the maximum service temperature of 4J36?
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 4J36?
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 4J36?
ASTM F1684, MIL-I-23011C Class 7
Where is 4J36 typically used?
LNG containment & cryogenics (Marine & Offshore); Metrology & precision structures (Semiconductor & Vac-Electronics)
In which forms is 4J36 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