UNI 1.4401 Stainless steels

Material group: Ferrous Alloys / Stainless steels

Country/Standard: Italy / UNI

Data updates

Latest Update: 2026-03

Total number of updates: 39

Update History

2025-11 2025-10 2025-03 2024-09 2024-04 2024-03 2024-02 2024-01 2023-12 2023-11 2023-04 2023-03 2022-10 2022-09 2022-07 2022-04 2022-03 2022-01 2021-12 2021-11 2021-09 2021-06 2021-04 2021-03 2020-12 2020-10 2019-09 2019-08 2019-06 2018-01 2017-06 2016-11 2016-10 2016-08 2016-05 2015-03 2015-02 2014-04

This material has 3424 properties — only a subset is shown here.

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UNI 1.4401 Chemical Composition

CRITERIA

VALUE

UNIT

CAS NUMBER

CRITERIA

VALUE

≤ 0.07

UNIT

CAS NUMBER

7440-44-0

CRITERIA

VALUE

16.5 – 18.5

UNIT

CAS NUMBER

7440-47-3

CRITERIA

VALUE

≤ 2.00

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

EN 10088-1: 2023 / Stainless steels - Part 1: List of stainless steels

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UNI 1.4401 Physical Properties

Temperature

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

PROPERTY / VALUE

Modulus of Elasticity

175 — 215 GPa

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Shear Modulus

val1 GPa

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Density

val1 kg/dm³

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Poisson Coefficient

val1

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Thermal Conductivity

15 W/(m∙°C)

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Heat Capacity

val1 J/(kg∙°C)

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Electrical Resistivity

0.75 Ω∙mm²/m

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Electrical Conductivity

val1 S/m

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This material has 3424 properties — only a subset is shown here.

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UNI 1.4401 Heat Treatments

(+AT) Solution annealed: 1020-1120°C, cooled sufficiently rapid in air or water.
Solution annealed (+AT): 1020-1120°C (for guidance only), cooling sufficiently rapid in water or air.

UNI 1.4401 Mechanical Properties

Temperature

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

PROPERTY / VALUE

Yield Strength, Rp0.2

val1 MPa

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Yield Strength, Rp1

val1 MPa

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Tensile Strength

500 — 2100 MPa

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Elongation, A

1 %

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Reduction of Area

val1 %

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Impact Energy

val1 J

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Brinell Hardness (HB)

≤ 215

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Vickers Hardness (HV)

val1

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1185 Cross References

199 Composition
538 Mechanical Properties
99 Physical Properties
16 Heat Treatment
2 Metallography
1 Machinability

102 Stress-Strain
57 Formability
- Fatigue
- Fracture
1 Creep

193 Joints
- Coatings
164 Dimensions
- Tribology

1 Corrosion
- Ageing
- Weatherability
- Irradiation

866 Total Suppliers