PROPRIETARY ATI S240 Alloy Stainless steels

Material group: Ferrous Alloys / Stainless steels

Country / Standard: PROPRIETARY

Data updates

Latest Update: 2026-02

Total number of updates: 3

Update History

2022-11 2021-03

This material has 154 properties — only a subset is shown here.

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PROPRIETARY ATI S240 Alloy Chemical Composition

CRITERIA

VALUE

UNIT

CAS NUMBER

CRITERIA

VALUE

0.7 – 1.5

UNIT

CAS NUMBER

7429-90-5

CRITERIA

VALUE

≤ 0.03

UNIT

CAS NUMBER

7440-44-0

CRITERIA

VALUE

11.00 – 12.50

UNIT

CAS NUMBER

7440-47-3

CRITERIA

VALUE

val1

UNIT

CAS NUMBER

7440-50-8

CRITERIA

VALUE

val1

UNIT

CAS NUMBER

7439-89-6

CRITERIA

VALUE

val1

UNIT

CAS NUMBER

7439-96-5

CRITERIA

VALUE

val1

UNIT

CAS NUMBER

7439-98-7

CRITERIA

VALUE

val1

UNIT

CAS NUMBER

7727-37-9; 17778-88-0

CRITERIA

VALUE

val1

UNIT

CAS NUMBER

7440-02-0

CRITERIA

VALUE

val1

UNIT

CAS NUMBER

7723-14-0

CRITERIA

VALUE

val1

UNIT

CAS NUMBER

7704-34-9

CRITERIA

VALUE

val1

UNIT

CAS NUMBER

7440-21-3

CRITERIA

VALUE

val1

UNIT

CAS NUMBER

7440-32-6

CRITERIA

VALUE

val1

UNIT

CAS NUMBER

7440-33-7

Allegheny Technologies Incorporated, Product Data Sheets,

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PROPRIETARY ATI S240 Alloy Physical Properties

Temperature

0 - 30°C 30 - 100°C 100 - 300°C ≥ 300°C

PROPERTY / VALUE

Modulus of Elasticity

179.3 — 215 GPa

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Thermal Conductivity

14.954 W/(m∙°C)

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Density

val1 kg/dm³

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Heat Capacity

val1 J/(kg∙°C)

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Melting Temperature

val1 °C

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Poisson Coefficient

val1

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This material has 154 properties — only a subset is shown here.

Unlock detailed physical values across temperatures and conditions.

PROPRIETARY ATI S240 Alloy Heat Treatments

Solution treatment should be performed from 913ºC to 941ºC (1675ºF to 1725ºF) for 45 to 75 minutes at temperature followed by cooling to 0ºC (32ºF) and holding for at least four hours to ensure complete transformation to martensite. No “deep freeze” or cryogenic processing is required. Aging is normally carried out from 510ºC to 621ºC (950ºF to 1150ºF), depending upon the desired final properties. Heat treatment is usually performed in air. Heat treatment of brazed components may be done in inert atmospheres. Reducing atmospheres should not be used because of the potential for nitrogen contamination.

PROPRIETARY ATI S240 Alloy Mechanical Properties

Temperature

≤ 0°C 0 - 30°C 30 - 100°C 100 - 300°C ≥ 300°C

PROPERTY / VALUE

Tensile Strength

1172 — 1704.1 MPa

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Elongation, A

val1 %

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Reduction of Area

val1 %

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Yield Strength, Rp0.2

val1 MPa

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Impact Energy

val1 J

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3Cross References

14Composition
96Mechanical Properties
33Physical Properties
1Heat Treatment
-Metallography
-Machinability

4Stress-Strain
-Formability
-Fatigue
2Fracture
-Creep

-Joints
-Coatings
-Dimensions
-Tribology

-Corrosion
-Ageing
-Weatherability
-Irradiation

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