UNS N19903

Incoloy Alloy
903

UNS N19903

AEETHER
GRADES
Incoloy 903

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Introduction

Chemical Composition

Gallery

Data Sheet

Applications

Incoloy 903
Round
Bar & Rod

Incoloy 903
Flat Bar

Incoloy 903
Square Bar

Incoloy 903
Hexagon Bar

Incoloy 903
Sheet

Incoloy 903
Plate

Incoloy 903
Coil

Incoloy 903
Strip

Incoloy 903 Introduction

Precipitation
Strengthened Alloy

Nickel

Iron

Cobalt

Corrosion
Resistance

Mechanical
Behavior

Purity

100

Overview

As a leading supplier & manufacturer in China, AEETHER supply cost-effective Incoloy 903 Products.

INCOLOY® alloy 903 (UNS N19903) is an agehardenable nickel-iron-cobalt alloy whose outstanding characteristics are a constant low coefficient of thermal expansion, a constant modulus of elasticity, and high strength.

The alloy’s characteristics make it an excellent candidate for applications such as rocket-engine thrust chambers, steam-turbine bolts, springs, gage blocks, and ordnance hardware.

Mechanical Properties

INCOLOY alloy 903 has high mechanical properties at room temperature and retains much of its strength up to around 1200°F (650°C). As indicated by the impact strength, no deleterious phases were present in the alloy. All properties are reported for age-hardened material. Stress-rupture properties of the alloy are governed by thermomechanical processing. Typical stress to produce rupture in 100 h of agehardened material at 1200°F (650°C) is 85 ksi (586 MPa). Room-temperature plane strain fracture toughness (KIC) of agehardened alloy 903 is 100.6 ksi • in (111.36 MPa • m) (average of three tests).

Corrosion Resistance

Testing was conducted for 500 h at 1000°F (540°C), 1100°F (595°C), and 1200°F (650°C). The specimens were alternately exposed to the test temperature for 15 min and cooled in air for 5 min. Because alloy 903 contains no chromium, oxidation resistance may become a consideration for some hightemperature applications. In such cases, protective coatings may be desirable.

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Incoloy 903 Chemical Composition

Al: 0.30% ~ 1.15%

Ti: 1.00% ~ 1.85%

Co: 13.0% ~ 17.0%

Nb: 2.40% ~ 3.50%

Fe: 36.5% ~ 47.3%

Ni: 36.0% ~ 40.0%

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Data Sheet

Physical Properties

Density	g/cm3	8.25
Density	lb/in.3	0.298
Melting Range	°F	2405 - 2539
Melting Range	°C	1318 - 1393
Curie Temperature	°F	780 - 880
Curie Temperature	°C	416 - 471

Mechanical Properties

Exposure Temperature		Yield Strength (0.2% Offset)		Tensile Strength		Elongation	Reduction of Area	Impact Strength
°F	°C	ksi	MPa	ksi	MPa	%	%	ft•lbf	J
70	21	165.5	1141	198.5	1369	17	43	24	32.5
1100	595	169.5	1169	200.5	1382	16	44	25	33.9
1200	650	149.0	1027	185.0	1276	19	47	26	35.3
1300	705	107.0	738	149.0	1027	20	41	—	—

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Incoloy 903 Applications

Aerospace

Quickly Understand What are the Main Incoloy Types.

Incoloy alloys are mostly nickel-chromium-iron alloys or nickel-iron-chromium alloys. Incoloy has good high temperature corrosion resistance. In this article, we will introduce the different types of Incoloy alloys one by one.

2022.11.08

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Relationships among Incoloy 903, 907 and 909

Incoloy 903, Incoloy 907 and Incoloy 909 are all low expansion superalloys. This article will fully explain the origin of these three alloys and their similarities and differences.

2022.05.09

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The Role of Cobalt in Superalloys

Cobalt is added to some superalloys. This article will explain the role of cobalt in superalloys from several aspects.

2021.12.12

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Clearly Understand Superalloys through 3 Classification ...

Up to hundreds of alloy grades may make you feel confused. In this article, we will classify superalloys from three aspects. From then on, you will have a clearer understanding of superalloys.

2021.11.11

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The Outlook of Nickel Alloy Application in Aviation ...

Thanks to the advancement of new technology, an increasing amount of newly developed nickel alloys materials now become accessible, bringing benefits to aviation industry. Nickel-based super alloy is developed to increase the operation temperature ...

2018.08.22

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More Incoloy Grades +

800

S ≤ 0.015%

Si ≤ 1.00%

C ≤ 0.10%

Mn ≤ 1.50%

Al: 0.15% ~ 0.60%

Ti: 0.15% ~ 0.60%

Cu ≤ 0.75%

Fe ≥ 39.5%

Cr: 19.0% ~ 23.0%

Ni: 30.0% ~ 35.0%

800H

S ≤ 0.015%

Si ≤ 1.00%

C: 0.05% ~ 0.10%

Mn ≤ 1.50%

Al: 0.15% ~ 0.60%

Ti: 0.15% ~ 0.60%

Cu ≤ 0.75%

Fe ≥ 39.5%

Cr: 19.0% ~ 23.0%

Ni: 30.0% ~ 35.0%

800HT

S ≤ 0.015%

Si ≤ 1.00%

C: 0.06% ~ 0.10%

Mn ≤ 1.50%

Al + Ti: 0.85% ~ 1.20%

Cu ≤ 0.75%

Fe ≥ 39.5%

Cr: 19.0% ~ 23.0%

Ni: 30.0% ~ 35.0%

803

S ≤ 0.015%

Si ≤ 1.00%

C: 0.06% ~ 0.10%

Mn ≤ 1.50%

P ≤ 0.045%

Al: 0.15% ~ 0.60%

Ti: 0.15% ~ 0.60%

Cu ≤ 0.75%

Fe: 29.4% ~ 39.4%

Cr: 25.0% ~ 29.0%

Ni: 32.0% ~ 37.0%

825

S ≤ 0.030%

Si ≤ 0.50%

C ≤ 0.05%

Mn ≤ 1.00%

Al ≤ 0.20%

Ti: 0.60% ~ 1.20%

Cu: 1.50% ~ 3.00%

Fe ≥ 22.0%

Mo: 2.5% ~ 3.5%

Cr: 19.5% ~ 23.5%

Ni: 38.0% ~ 46.0%

832

S ≤ 0.005%

Si ≤ 0.70%

C ≤ 0.05%

Mn ≤ 0.40%

Al ≤ 0.15%

Ti ≤ 0.40%

Cu ≤ 0.75%

Fe: 60.6% ~ 68.9%

Mo ≤ 0.4%

Cr: 19.5% ~ 21.0%

Ni: 8.75% ~ 15.5%

864

S ≤ 0.015%

Si: 0.6% ~ 1.0%

C ≤ 0.08%

Mn ≤ 1.00%

P ≤ 0.045%

Ti: 0.40% ~ 1.00%

Cu ≤ 0.75%

Fe: 29.1% ~ 43.9%

Mo: 4.0% ~ 4.8%

Cr: 20.0% ~ 25.0%

Ni: 30.0% ~ 38.0%

890

S ≤ 0.015%

Si: 1.0% ~ 2.0%

C: 0.06% ~ 0.14%

Mn ≤ 1.50%

P ≤ 0.030%

Nb: 0.20% ~ 1.00%

Ta: 0.10% ~ 0.60%

Al: 0.05% ~ 0.60%

Ti: 0.15% ~ 0.60%

Cu ≤ 0.75%

Fe ≥ 17.3%

Mo: 1.0% ~ 2.0%

Cr: 23.5% ~ 28.5%

Ni: 40.0% ~ 45.0%

903

Co: 13.0% ~ 17.0%

Nb: 2.40% ~ 3.50%

Al: 0.30% ~ 1.15%

Ti: 1.00% ~ 1.85%

Fe: 36.5% ~ 47.3%

Ni: 36.0% ~ 40.0%

907

Si: 0.07% ~ 0.35%

Co: 12.0% ~ 16.0%

Nb: 4.30% ~ 5.20%

Al ≤ 0.20%

Ti: 1.30% ~ 1.80%

Fe: 36.5% ~ 47.1%

Ni: 35.0% ~ 40.0%

908

S ≤ 0.005%

Si ≤ 0.50%

C ≤ 0.03%

Mn ≤ 1.00%

P ≤ 0.015%

B ≤ 0.012%

Co ≤ 0.50%

Nb: 2.70% ~ 3.30%

Al: 0.75% ~ 1.25%

Ti: 1.20% ~ 1.80%

Cu ≤ 0.50%

Fe ≥ 36.1%

Cr: 3.75% ~ 4.5%

Ni: 47.0% ~ 51.0%

909

S ≤ 0.015%

Si: 0.25% ~ 0.50%

C ≤ 0.06%

Mn ≤ 1.00%

P ≤ 0.015%

B ≤ 0.012%

Co: 12.0% ~ 16.0%

Nb: 4.30% ~ 5.20%

Ta ≤ 0.05%

Al ≤ 0.15%

Ti: 1.30% ~ 1.80%

Cu ≤ 0.50%

Fe: 36.3% ~ 46.9%

Cr ≤ 1.0%

Ni: 35.0% ~ 40.0%

925

S ≤ 0.030%

Si ≤ 0.50%

C ≤ 0.03%

Mn ≤ 1.00%

P ≤ 0.030%

Nb ≤ 0.50%

Al: 0.10% ~ 0.50%

Ti: 1.90% ~ 2.40%

Cu: 1.50% ~ 3.00%

Fe ≥ 22.0%

Mo: 2.5% ~ 3.5%

Cr: 19.5% ~ 22.5%

Ni: 42.0% ~ 46.0%

926

S ≤ 0.010%

Si ≤ 0.50%

C ≤ 0.02%

Mn ≤ 2.00%

P ≤ 0.030%

N: 0.15% ~ 0.25%

Cu: 0.50% ~ 1.50%

Fe: 41.7% ~ 47.8%

Mo: 6.0% ~ 7.0%

Cr: 19.0% ~ 21.0%

Ni: 24.0% ~ 26.0%

945

S ≤ 0.030%

Si ≤ 0.50%

C: 0.005% ~ 0.040%

Mn ≤ 1.00%

P ≤ 0.030%

Nb: 2.40% ~ 4.50%

Al: 0.01% ~ 0.70%

Ti: 0.50% ~ 2.50%

Cu: 1.50% ~ 3.00%

Fe: 5.7% ~ 28.0%

Mo: 3.0% ~ 4.0%

Cr: 19.5% ~ 23.0%

Ni: 45.0% ~ 55.0%

945X

S ≤ 0.030%

Si ≤ 0.50%

C: 0.005% ~ 0.030%

Mn ≤ 1.00%

P ≤ 0.030%

Nb: 3.50% ~ 4.50%

Al: 0.01% ~ 0.70%

Ti: 0.50% ~ 2.50%

Cu: 1.50% ~ 3.00%

Fe: 6.2% ~ 20.4%

Mo: 3.0% ~ 4.0%

Cr: 19.5% ~ 22.5%

Ni: 50.0% ~ 55.0%

MA956

C ≤ 0.10%

Mn ≤ 0.30%

P ≤ 0.020%

Y2O3

Y2O3: 0.3% ~ 0.7%

Co ≤ 0.30%

Al: 3.75% ~ 5.75%

Ti: 0.20% ~ 0.60%

Cu ≤ 0.15%

Fe: 70.1% ~ 75.9%

Cr: 18.5% ~ 21.5%

Ni ≤ 0.5%

A-286

S ≤ 0.030%

Si ≤ 1.00%

C ≤ 0.08%

Mn ≤ 2.00%

P ≤ 0.040%

B: 0.001% ~ 0.010%

V: 0.10% ~ 0.50%

Al ≤ 0.35%

Ti: 1.90% ~ 2.35%

Fe: 49.1% ~ 56.0%

Mo: 1.00% ~ 1.50%

Cr: 13.5% ~ 16.0%

Ni: 24.0% ~ 27.0%

020

S ≤ 0.035%

Si ≤ 1.00%

C ≤ 0.07%

Mn ≤ 2.00%

P ≤ 0.045%

Nb + Ta: 8*C% ~ 1.00%

Cu: 3.00% ~ 4.00%

Fe: 29.9% ~ 44.0%

Mo: 2.0% ~ 3.0%

Cr: 19.0% ~ 21.0%

Ni: 32.0% ~ 38.0%

028

S ≤ 0.030%

Si ≤ 1.00%

C ≤ 0.03%

Mn ≤ 2.50%

P ≤ 0.030%

Cu: 0.60% ~ 1.40%

Fe: 29.0% ~ 36.8%

Mo: 3.0% ~ 4.0%

Cr: 26.0% ~ 28.0%

Ni: 30.0% ~ 34.0%

S ≤ 0.030%

Si: 1.90% ~ 2.60%

C ≤ 0.10%

Mn: 0.80% ~ 1.50%

Ni + Co: 34.5% ~ 41.0%

Ti ≤ 0.20%

Cu ≤ 0.50%

Fe: 35.1% ~ 45.0%

Cr: 17.0% ~ 19.0%

Ni + Co: 34.5% ~ 41.0%

330

S ≤ 0.030%

Si: 0.75% ~ 1.50%

C ≤ 0.08%

Mn ≤ 2.00%

P ≤ 0.030%

Cu ≤ 1.00%

Fe: 39.4% ~ 46.1%

Cr: 17.0% ~ 20.0%

Ni: 34.0% ~ 37.0%

25-6HN

S ≤ 0.030%

Si ≤ 1.00%

C ≤ 0.03%

Mn ≤ 2.00%

P ≤ 0.040%

N: 0.18% ~ 0.25%

Cu ≤ 0.75%

Fe: 41.4% ~ 50.3%

Mo: 6.0% ~ 7.0%

Cr: 20.0% ~ 22.0%

Ni: 23.5% ~ 25.5%

27-7MO

S ≤ 0.010%

Si ≤ 0.50%

C ≤ 0.02%

Mn ≤ 3.00%

P ≤ 0.030%

N: 0.30% ~ 0.40%

Cu: 0.50% ~ 1.50%

Fe: 35.5% ~ 42.6%

Mo: 6.5% ~ 8.0%

Cr: 20.5% ~ 23.0%

Ni: 26.0% ~ 28.0%

Incoloy Alloy 903

Incoloy 903 Introduction

Overview

Mechanical Properties

Corrosion Resistance

Incoloy 903 Chemical Composition

Try our Premium Products

Data Sheet

Physical Properties

Mechanical Properties

Incoloy 903 Applications

Aerospace

Related Article

Quickly Understand What are the Main Incoloy Types.

Relationships among Incoloy 903, 907 and 909

The Role of Cobalt in Superalloys

Clearly Understand Superalloys through 3 Classification ...

The Outlook of Nickel Alloy Application in Aviation ...

More Incoloy Grades +

Incoloy Alloy
903