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HomeGradesN07080

NiCr20TiAl · UNS N070802.4952 / 2.4631 · Alloy 80A / Nimonic 80A

ГОСТ≈ ХН77ТЮР (ЭИ437Б)

Age-hardened — exhaust valves and turbine blades, 815 °C class

NimonicNi superalloys
Units
Tensile Rm
930
MPa · ≥ std. min
Yield Rp0.2
620
MPa · ≥ std. min
Elongation A
20
% · ≥ std. min
Service limit
815
°C · indicative max
Density
8.19
g/cm³

Physical properties

Density8.2g/cm³
Modulus E216GPa
Thermal conductivity11.4W/(m·K)
Thermal expansion12.6×10⁻⁶/K
Specific heat0.46kJ/(kg·K)
Resistivity1.24Ω·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

Ni 72%Cr 20%Ti 2.3%Al 1.1%Minor & residual 5.1%

Nominal: mid-range where both limits are given, the cap where only a maximum is, balance takes the remainder. Exact specified ranges below.

ElementName Content %
Main elements4 elements
Ni NickelBal.
Cr Chromium18 – 21%
Ti Titanium1.8 – 2.7%
Al Aluminium0.5 – 1.8%
ElementName Content %
Minor & residual5 elements
Fe Iron≤ 3%
C Carbon≤ 0.1%
Mn Manganese≤ 1%
Si Silicon≤ 1%
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.

FormCondition Rm MPaRp0.2 MPaA ≥ %
Bar and forgings
Bar, forgings and forging stockResponse after solution treatment, stabilising and ageing ≥ 930 (135 ksi) ≥ 620 (90 ksi) ≥ 20
Long products (thickness or dia. ≤160 mm)P, precipitation hardened ≥ 1000 ≥ 600 ≥ 18
Plate, sheet and strip
Flat products (3–20 mm thick)P, precipitation hardened ≥ 1000 ≥ 600 ≥ 18

Creep behaviour

⚠ Scope: these figures apply only to grade 2.4952 in EN 10302:2008, as informative guidance; the product standard for this grade specifies no creep data. Use for shortlisting, not for acceptance or design.

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 °CCreep strength Rp1.0 (1% plastic strain)Rupture strength Ru
10 000 h100 000 h10 000 h100 000 h
500624530(745)(578)
510608504(711)(545)
520586477(680)(510)
530567450646480
540544418615447
550523390582416
560500362552384
570474334520354
580450308491327
590425282462298
600398257433272
610370230403247
620348210378222
630326187351198
640303167325176
650275149300157
660260132275135
670240115251118
68021999229102
6902018520888
7001837218675
7101676417065
7201505515357
7301354713749
7401224012544
7501063311437
760972910333
77085249429
78075208625
79068177823
80058167020
1020501002005001000500520540560580600620640660680700720740760780800Stress MPa (log)Temperature °C10 000 h100 000 h1020501002005001000500540580620660700740800Stress MPa (log)Temperature °C10 000 h100 000 h1020501002005001000500530560590620650680710740770800Stress MPa (log)Temperature °C10 000 h100 000 h
Logarithmic stress axis. Colour encodes time (1 000 / 10 000 / 100 000 h); solid lines are rupture strength Ru and the dashed line of the same colour is Rp1.0 (1 % plastic elongation). Informative mean values, not acceptance values.

A stress-rupture acceptance requirement also applies; see "Stress-rupture requirement" below. That is a pass/fail acceptance test, quite unlike the informative guidance values in this section.

Thermal expansion and elastic modulus

Temperature rangeMean coefficient ×10⁻⁶/K
20–200 °C12.6
20–300 °C13.1
20–400 °C13.5
20–600 °C14
05101520200300400600×10⁻⁶/KUpper end of interval °CMean expansion α05101520200300400600×10⁻⁶/KUpper end of interval °CMean expansion α05101520200300400600×10⁻⁶/KUpper end of interval °CMean expansion α
Each point is the mean from 20 °C to that temperature.

Elastic modulus vs temperature

Temp °CE GPa
20216
100212
200208
300202
400196
500189
600179
700161
800130
10012515017520022520100200300400500600700800GPaTemperature °CE10012515017520022520200300400500600700800GPaTemperature °CE10012515017520022520100200300400500600700800GPaTemperature °CE

Stress-rupture requirement

Heat treatmentSolution + stabilize + precipitation hardened
Test temperature1400 °F (760 °C)
Test stress47 000 psi (325 MPa)
Minimum life≥ 23 h
Elongation≥ 3.5 %

This is a pass/fail acceptance test, not a design creep curve.

Where this grade is recommended

Matched in 3 service conditions; ranks and scores computed from the condition-scoring matrix.

Service conditionIndustry TemperatureRankScore
Engine & exhaust valves Automotive & Racing 500 – 750 °C 1 / 7 95
Turbine discs & blades Aerospace 800 – 1100 °C 1 / 8 85
HT fasteners & springs Power & Nuclear > 650 °C 3 / 7 85

Designations & equivalents

W.Nr. (Germany)2.4952 / 2.4631
EN designationNiCr20TiAl
Trade name(s)Nimonic 80A
ASTM / AISIB637
BS (UK)HR 1 (bar/forging) · HR 201 (sheet/plate/strip) · HR 401 (pipe/tube) · HR 601 · BS 3076
AFNOR (France)NC 20TA
GOST (Russia)≈ ХН77ТЮР (ЭИ437Б)

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

3 specifications. Name the standard and its edition on the order.

ASTM B637EN 10302 (creep-resisting steels, nickel and cobalt alloys)BS 3HR

Guaranteed values and required tests differ between specifications — see Mechanical minima by form for the figures per form.

Frequently asked questions

What is Alloy 80A · UNS N07080?

Alloy 80A · UNS N07080 — Ni superalloys. Age-hardened — exhaust valves and turbine blades, 815 °C class

What is the maximum service temperature of N07080?

Typically about 815 °C; the practical limit depends on media, stress and design life — acceptance per the governing standard.

What is the tensile strength of N07080?

The specified minimum tensile strength is 930 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 N07080?

ASTM B637, EN 10302 (creep-resisting steels, nickel and cobalt alloys), BS 3HR

Where is N07080 typically used?

Engine & exhaust valves (Automotive & Racing); Turbine discs & blades (Aerospace); HT fasteners & springs (Power & Nuclear)

In which forms is N07080 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

2.4632 · Alloy 90 / Nimonic 90NiCr20Co18Ti · UNS N070902.4650 · Alloy 263 / Nimonic 263NiCo20Cr20MoTi · UNS N072632.4634 · Alloy 105 / Nimonic 105Nimonic105NiCo20Cr15MoAlTi2.4636 · Alloy 115 / Nimonic 115Nimonic115

Download PDF datasheet

This grade’s datasheet as an A4 PDF — for filing, printing or forwarding to colleagues.

Download PDF datasheet

Supply & enquiry

Tube & pipeφ1 – 219 × 0.25 – 25 mmPlate4.76 – 80 mmBarφ8 – 300 mmWire & filler metalsφ0.01 – 8 mm

For this grade we can supply, against your service conditions:

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