Physical properties
| Density | 9.22 | g/cm³ |
Informative values: they vary with composition, condition and test method. Use the governing standard or measured mill data for pressure and heat-transfer calculations.
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 elements2 elements | |||
| Ni | Nickel | Bal. | |
| Mo | Molybdenum | 26 – 30% | |
| Element | Name | Content % | |
|---|---|---|---|
| Minor & residual8 elements | |||
| Fe | Iron | ≤ 2% | |
| Cr | Chromium | ≤ 1% | |
| C | Carbon | ≤ 0.02% | |
| Si | Silicon | ≤ 0.1% | |
| Co | Cobalt | ≤ 1% | |
| Mn | Manganese | ≤ 1% | |
| P | Phosphorus | ≤ 0.04% | |
| 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 and descaled | ≥ 760 (110 ksi) | ≥ 350 (51 ksi) | ≥ 40 | |
| Plate, sheet and strip | |||||
| Plate, sheet and strip | Solution annealed | ≥ 760 (110 ksi) | ≥ 350 (51 ksi) | ≥ 40 | |
| Tube and pipe | |||||
| Seamless pipe and tube | Solution annealed and descaled | ≥ 760 (110 ksi) | ≥ 350 (51 ksi) | ≥ 40 | |
| Welded pipe and tube | Solution annealed | ≥ 760 (110 ksi) | ≥ 350 (51 ksi) | ≥ 40 | |
| Fittings and flanges | |||||
| Fittings (factory-made wrought butt-weld / socket) | 1950 °F [1065 °C] minimum, rapid air or water quench | — | — | — | Tensile properties follow the starting material. No tension test on the finished fitting unless agreed. Minimum temperature. |
Hardness requirement
Informative only — not a basis for acceptance — ≤ 100 HRB (sheet, strip and plate, annealed)
⚠ This is not an acceptance criterion.
More detail 2
Hardness values are for information only and are not a basis for rejection or acceptance.
The binding requirements in that table are the tensile ones: for Hastelloy B-2, both sheet and strip (under 4.76 mm) and plate (4.76–63.5 mm) require ≥760 MPa tensile, ≥350 MPa yield and ≥40% elongation.
Grain size
Required by the standard, conditionally — Annealed sheet and strip: mean grain diameter ≤0.127 mm at t ≤3.175 mm; ≤0.214 mm above 3.175 mm
Applies to annealed sheet and strip only; plate and the other product forms are not assessed.
More detail 2
The mean-grain-diameter column is a maximum in both standards and carries identical values, so it is unambiguous; this entry is therefore stated in terms of diameter.
The contradiction in the grain-size-number column is a printing matter: an order that is to be accepted on the number must state in the contract which standard and which column governs.
Where this grade is recommended
Matched in 3 service conditions; ranks and scores computed from the condition-scoring matrix.
| Service condition | Industry | Temperature | Rank | Score |
|---|---|---|---|---|
| HCl & reducing acids | Chemical Processing | ≤ 60 °C | 1 / 8 | 95 |
| Acidizing & fracturing (HCl/HF) | Oil & Gas | ≤ 120 °C | 1 / 6 | 94 |
| Hydrofluoric acid | Chemical Processing | ≤ 50 °C | 6 / 6 | 78 |
Designations & equivalents
| W.Nr. (Germany) | 2.4617 |
| EN designation | NiMo28 |
| Trade name(s) | Hastelloy B-2 / Nimofer 6928 |
| ASTM / AISI | B333 / B335 / B366 / B462 / B564 / B619 / B622 |
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
7 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 B-2 · UNS N10665?
Alloy B-2 · UNS N10665 — Ni corrosion-resistant. Ni-Mo type — dedicated to hydrochloric and reducing acids
What is the maximum service temperature of N10665?
Typically about 540 °C; the practical limit depends on media, stress and design life — acceptance per the governing standard.
What is the tensile strength of N10665?
The specified minimum tensile strength is 760 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 N10665?
ASTM B333, ASTM B335, ASTM B366, ASTM B462, ASTM B564 (forgings), ASTM B619, ASTM B622
Where is N10665 typically used?
HCl & reducing acids (Chemical Processing); Acidizing & fracturing (HCl/HF) (Oil & Gas); Hydrofluoric acid (Chemical Processing)
In which forms is N10665 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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