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 | |||
| Ni | Nickel | Bal. | |
| Cr | Chromium | 21 – 23.5% | |
| Fe | Iron | 18 – 21% | |
| Mo | Molybdenum | 6 – 8% | |
| Co | Cobalt | ≤ 5% | |
| Cu | Copper | 1.5 – 2.5% | |
| Element | Name | Content % | |
|---|---|---|---|
| Minor & residual6 elements | |||
| C | Carbon | ≤ 0.015% | |
| Mn | Manganese | ≤ 1% | |
| W | Tungsten | ≤ 1.5% | |
| Si | Silicon | ≤ 1% | |
| Nb+Ta | Niobium + tantalum | ≤ 0.5% | |
| S | Sulphur | ≤ 0.03% | |
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 |
|---|---|---|---|---|---|
| Bar and forgings | |||||
| Bar | Annealed, diameter 7.94–19.05 mm inclusive | ≥ 621 (90 ksi) | ≥ 241 (35 ksi) | ≥ 45 | |
| Bar | Annealed, diameter over 19.05 mm up to 88.9 mm inclusive | ≥ 586 (85 ksi) | ≥ 207 (30 ksi) | ≥ 35 | |
| Plate, sheet and strip | |||||
| Plate | Annealed, thickness 4.76–19.05 mm inclusive | ≥ 621 (90 ksi) | ≥ 241 (35 ksi) | ≥ 45 | |
| Plate | Annealed, thickness over 19.05 mm up to 63.5 mm inclusive | ≥ 586 (85 ksi) | ≥ 207 (30 ksi) | ≥ 35 | |
| Sheet | Annealed, thickness over 0.51 mm | ≥ 621 (90 ksi) | ≥ 241 (35 ksi) | ≥ 45 | |
| Tube and pipe | |||||
| Seamless pipe and tube | Solution annealed and descaled | ≥ 621 (90 ksi) | ≥ 241 (35 ksi) | ≥ 40 | |
| Automatic fusion-welded pipe | Class I: solution annealed after welding; Class II: cold worked after welding, then solution annealed | ≥ 621 (90 ksi) | ≥ 241 (35 ksi) | ≥ 45 | |
| High-strength seamless pipe and tube, Type 1 | Cold worked after solution annealing at not less than 1121 °C | ≥ 793 (115 ksi) | ≥ 758 (110 ksi) | ≥ 11 | Also specified: Hardness ≤ 40 HRC |
| High-strength seamless pipe and tube, Type 2 | Cold worked after solution annealing at not less than 1121 °C | ≥ 896 (130 ksi) | ≥ 862 (125 ksi) | ≥ 10 | Also specified: Hardness ≤ 40 HRC |
| Fittings and flanges | |||||
| Fittings (factory-made wrought butt-weld / socket) | 2100-2150 °F [1147-1177 °C], rapid air or water quench | — | — | — | Recommended temperature; tolerance ±15 °C (±25 °F). Tensile properties follow the starting material. No tension test on the finished fitting unless agreed. |
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 |
|---|---|---|---|---|
| Downhole tubing (sour H₂S/CO₂) | Oil & Gas | > 230 °C | 2 / 10 | 90 |
| Phosphoric acid | Chemical Processing | 80 – 200 °C | 3 / 7 | 84 |
Designations & equivalents
| W.Nr. (Germany) | 2.4619 |
| EN designation | NiCr22Mo7Cu |
| Trade name(s) | Hastelloy G-3 / Nicrofer 4823 |
| ASTM / AISI | B366 / B581 / B582 / B619 / B622 / B983 |
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
6 specifications. Name the standard and its edition on the order.
Guaranteed values and required tests differ between specifications — see Mechanical minima by form for the figures per form.
Frequently asked questions
What is Alloy G-3 · UNS N06985?
Alloy G-3 · UNS N06985 — Ni corrosion-resistant. The domestic OCTG standard for sour wells — H₂S/CO₂ completions
What is the maximum service temperature of N06985?
Typically about 450 °C; the practical limit depends on media, stress and design life — acceptance per the governing standard.
What is the tensile strength of N06985?
The specified minimum tensile strength is 621 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 N06985?
ASTM B582, ASTM B581, ASTM B622, ASTM B619/B619M, ASTM B983, ASTM B366
Where is N06985 typically used?
Downhole tubing (sour H₂S/CO₂) (Oil & Gas); Phosphoric acid (Chemical Processing)
In which forms is N06985 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
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