Chemical composition
Nominal: mid-range where both limits are given, the cap where only a maximum is, balance takes the remainder. Exact specified ranges below.
| Element | Name | Content % | |
|---|---|---|---|
| Main elements6 elements | |||
| Fe | Iron | Bal. | |
| Ni | Nickel | 18 – 19% | |
| Co | Cobalt | 11.5 – 12.5% | |
| Mo | Molybdenum | 4.6 – 5.2% | |
| Ti | Titanium | 1.3 – 1.6% | |
| Al | Aluminium | 0.05 – 0.15% | |
| Element | Name | Content % | |
|---|---|---|---|
| Minor & residual5 elements | |||
| C | Carbon | ≤ 0.03% | |
| Mn | Manganese | ≤ 0.1% | |
| Si | Silicon | ≤ 0.1% | |
| P | Phosphorus | ≤ 0.01% | |
| S | Sulphur | ≤ 0.01% | |
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 | |||||
| Sheet and strip (<0.100 in) | Solution annealed, then aged at 510±5 °C for 3–6 h | — | ≥ 2275 (330 ksi) | ≥ 1 | |
| Sheet and strip (0.100–0.380 in) | Solution annealed, then aged at 510±5 °C for 3–6 h | — | ≥ 2275 (330 ksi) | ≥ 1.8 | |
| Other | |||||
| All products | Supplied solution annealed, descaled and oiled by default | — | — | — | Also specified: Hardness ≤ 38 HRC |
| Aged condition | 510±5 °C × 3–6 h, then air cooled | — | — | — | Also specified: Hardness ≥ 56 HRC |
Where this grade is recommended
Matched in 1 service conditions; ranks and scores computed from the condition-scoring matrix.
| Service condition | Industry | Temperature | Rank | Score |
|---|---|---|---|---|
| HS fasteners & shafts | Aerospace | ≤ 300 °C | 6 / 9 | 87 |
Designations & equivalents
| W.Nr. (Germany) | ≈ 1.6356 |
| Trade name(s) | Maraging 350 / C350 / Vascomax C350 |
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 Maraging 350 (18Ni350)?
Maraging 350 (18Ni350) — Maraging steel. 2400 MPa-class ultimate strength — special fasteners and centrifuge parts
What is the maximum service temperature of 18Ni350?
Typically about 400 °C; the practical limit depends on media, stress and design life — acceptance per the governing standard.
Which standards cover 18Ni350?
MIL-S-46850D Grade 350 18%Ni
Where is 18Ni350 typically used?
HS fasteners & shafts (Aerospace)
In which forms is 18Ni350 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
Further reading: Alloy 625 Grade 1 vs Grade 2: a heat-treatment condition, not a quality level