Physical properties
| Density | 8.2 | g/cm³ |
| Modulus E | 212 | GPa |
| Thermal conductivity | 12 | W/(m·K) |
| Thermal expansion | 14.3 | ×10⁻⁶/K |
| Specific heat | 0.45 | kJ/(kg·K) |
| Resistivity | 1.15 | Ω·mm²/m |
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 elements3 elements | |||
| Ni | Nickel | ≥ 58% | |
| Cr | Chromium | 27 – 31% | |
| Fe | Iron | 7 – 11% | |
| Element | Name | Content % | |
|---|---|---|---|
| Minor & residual5 elements | |||
| C | Carbon | ≤ 0.05% | |
| Mn | Manganese | ≤ 0.5% | |
| Si | Silicon | ≤ 0.5% | |
| Cu | Copper | ≤ 0.5% | |
| S | Sulphur | ≤ 0.015% | |
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 and rod | Annealed after cold or hot working, all sizes | ≥ 586 (85 ksi) | ≥ 240 (35 ksi) | ≥ 30 | |
| Forgings, flanges, fittings and valve parts | Annealed | ≥ 586 (85 ksi) | ≥ 241 (35 ksi) | ≥ 30 | |
| Plate, sheet and strip | |||||
| Hot-rolled plate and sheet, cold-rolled sheet and strip | Conventionally annealed | ≥ 586 (85 ksi) | ≥ 240 (35 ksi) | ≥ 30 | |
| Hot-rolled plate | Annealed at ≥1850 °F [1010 °C] — lower-strength band | ≥ 514 (75 ksi) | ≥ 206 (30 ksi) | ≥ 30 | |
| Tube and pipe | |||||
| Seamless condenser and heat-exchanger tube | Annealed | ≥ 586 (85 ksi) | ≥ 241 (35 ksi) | ≥ 30 | |
| Seamless pipe and tube | Hot-worked or hot-worked annealed, OD ≤127 mm | ≥ 586 (85 ksi) | ≥ 205 (30 ksi) | ≥ 35 | |
| Seamless pipe and tube | Hot-worked or hot-worked annealed, OD >127 mm | ≥ 515 (75 ksi) | ≥ 170 (25 ksi) | ≥ 35 | |
| Seamless pipe and tube | Cold-worked annealed, OD ≤127 mm | ≥ 586 (85 ksi) | ≥ 240 (35 ksi) | ≥ 30 | |
| Seamless pipe and tube | Cold-worked annealed, OD >127 mm | ≥ 586 (85 ksi) | ≥ 205 (30 ksi) | ≥ 35 | |
| Welded heat-exchanger and condenser tube | Annealed (Class 1 or Class 2 — see note) | ≥ 586 (85 ksi) | ≥ 240 (35 ksi) | ≥ 30 | Every piece is leak- or electrically tested (hydrostatic, pneumatic, eddy current or ultrasonic). Flattening and flange tests required. |
| Several forms | |||||
| Long products ≤160 mm and flat products ≤20 mm (EN 10302, 2.4642) | +AT (solution annealed) | ≥ 590 | ≥ 240 | ≥ 30 | Flat products under 3 mm: A five points lower. |
Hardness requirement
Required by the standard, conditionally
| Form and thickness | Hardness max |
|---|---|
| Sheet; strip >0.25–3.2 mm | ≤ 86 HRB |
| Strip 0.13–0.25 mm | ≤ 88 HRB |
Likewise limited to cold-rolled deep-drawing and spinning-quality sheet and strip; ordinary plate, sheet and strip carry NO hardness requirement.
More detail 2
This is a hardness CEILING — deep-drawing material must be soft enough to form — the opposite in kind to the floor carried by age-hardened grades.
Under 1.3 mm the Rockwell B reading is affected by specimen thickness; use superficial Rockwell or Vickers instead.
Creep behaviour
Guidance values (MPa) — Mean values of a scatter band. They are neither an acceptance requirement nor a design allowable stress. Figures in parentheses are long-term extrapolations and less reliable than the tested range.
| Temp °C | Creep strength Rp1.0 (1% plastic strain) | Rupture strength Ru | ||
|---|---|---|---|---|
| 10 000 h | 100 000 h | 10 000 h | 100 000 h | |
| 700 | 42 | 30 | 56 | 39 |
| 750 | 30 | 19.3 | 41 | 30 |
| 800 | 20 | 12 | 30 | 21 |
| 850 | 12.8 | 7.6 | 21.5 | 14.4 |
| 900 | 8.2 | 4.8 | 15.4 | 10 |
| 950 | 5.3 | 3 | 10.9 | 7 |
| 1000 | 3.4 | 1.9 | 7.7 | 4.8 |
| 1050 | 2.2 | 1.2 | 5.4 | 3.4 |
Thermal expansion and elastic modulus
| Temperature range | Mean coefficient ×10⁻⁶/K |
|---|---|
| 20–200 °C | 14.3 |
| 20–300 °C | 14.5 |
| 20–400 °C | 14.8 |
| 20–600 °C | 15.7 |
| 20–800 °C | 16.6 |
| 20–1000 °C | 17.3 |
Elastic modulus vs temperature
| Temp °C | E GPa |
|---|---|
| 20 | 212 |
| 100 | 206 |
| 200 | 201 |
| 300 | 195 |
| 400 | 189 |
| 500 | 182 |
| 600 | 175 |
| 700 | 167 |
| 800 | 155 |
Grain size
Required by the standard, conditionally
| Form and thickness | ASTM micrograin size | Mean grain section dia. |
|---|---|---|
| Sheet ≤1.3 mm | No. 4.5 or finer | ≤ 0.075 mm |
| Sheet >1.3–6.4 mm | No. 3.5 or finer | ≤ 0.110 mm |
| Strip 0.13–0.25 mm | No. 8 or finer | ≤ 0.022 mm |
| Strip >0.25–3.2 mm | No. 4.5 or finer | ≤ 0.075 mm |
Applies only to COLD-ROLLED DEEP-DRAWING AND SPINNING QUALITY sheet and strip.
More detail 4
If the order does not call for that quality, this table does not apply.
For this product class, grain size and hardness REPLACE the ordinary tensile minima — the tensile minima do not apply to it, and vice versa.
The direction is "or finer" (a maximum grain diameter), the opposite of 800H's "No. 5 or coarser": deep drawing needs fine grain against orange peel, creep needs coarse grain.
Strip over 3.2 mm thick or over 305 mm wide is judged on the sheet rows; under 0.13 mm, testing is not recommended.
Where this grade is recommended
Matched in 4 service conditions; ranks and scores computed from the condition-scoring matrix.
| Service condition | Industry | Temperature | Rank | Score |
|---|---|---|---|---|
| Nuclear SG tubing | Power & Nuclear | ≤ 300 °C | 1 / 4 | 96 |
| Nitric & oxidising media | Chemical Processing | 60 – 120 °C | 1 / 7 | 88 |
| Nuclear fuel cladding & grids | Power & Nuclear | ≤ 350 °C | 3 / 4 | 82 |
| Caustic & molten alkali | Chemical Processing | ≤ 80 °C | 5 / 5 | 82 |
Designations & equivalents
| W.Nr. (Germany) | 2.4642 |
| EN designation | NiCr29Fe |
| Trade name(s) | Inconel 690 / Nicrofer 6030 |
| ASTM / AISI | B163 / B166 / B167 / B168 / B516 / B564 / B829 / B906 |
| AWS (welding) | A5.14 ERNiCrFe-7 / A5.11 ENiCrFe-7 |
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
9 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 690 · UNS N06690?
Alloy 690 · UNS N06690 — Ni corrosion-resistant. High-chromium nuclear grade — steam-generator tubing
What is the maximum service temperature of N06690?
Typically about 550 °C; the practical limit depends on media, stress and design life — acceptance per the governing standard.
What is the tensile strength of N06690?
The specified minimum tensile strength is 586 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 N06690?
ASTM B163, ASTM B166, ASTM B167, ASTM B168, ASTM B516, ASTM B564 (forgings), ASTM B829, ASTM B906, EN 10302 (creep-resisting steels, nickel and cobalt alloys)
Where is N06690 typically used?
Nuclear SG tubing (Power & Nuclear); Nitric & oxidising media (Chemical Processing); Nuclear fuel cladding & grids (Power & Nuclear); Caustic & molten alkali (Chemical Processing)
In which forms is N06690 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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