UNI 1.4438 Stainless steels

Material group: Ferrous Alloys / Stainless steels

Country/Standard: Italy / UNI

Data updates

Latest Update: 2026-02

Total number of updates: 34

Update History

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

This material has 1095 properties — only a subset is shown here.

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UNI 1.4438 Chemical Composition

CRITERIA

VALUE

UNIT

CAS NUMBER

CRITERIA

VALUE

≤ 0.030

UNIT

CAS NUMBER

7440-44-0

CRITERIA

VALUE

17.5 – 19.5

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 1.4438 Physical Properties

Temperature

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

PROPERTY / VALUE

Modulus of Elasticity

190 — 215 GPa

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Density

val1 kg/dm³

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Poisson Coefficient

val1

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Thermal Conductivity

14 W/(m∙°C)

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Heat Capacity

val1 J/(kg∙°C)

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Electrical Resistivity

0.85 Ω∙mm²/m

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Electrical Conductivity

val1 S/m

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This material has 1095 properties — only a subset is shown here.

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UNI 1.4438 Heat Treatments

Solution annealed (+AT): 1100-1160°C (for guidance only), cooling sufficiently rapid in water or air.
Hot forming: 1150-850°C, air cooling; Solution annealing (+AT): 1020-1120°C, water or air cooling. If heat treatment is carried out in a continuous furnace, the upper part of the range specified should usually be preferred, or even exceeded. The lower end of the range specified for solution annealing should be aimed at the heat treatment as part of further processing, because otherwise the mechanical properties might be affected. If the temperature of hot forming does not drop below the lower temperature for solution annealing, a temperature of 1020°C for steels with Mo contents exceeding 3 %.

UNI 1.4438 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

490 — 720 MPa

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Elongation, A

30 %

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Impact Energy

val1 J

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Brinell Hardness (HB)

≤ 215

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314 Cross References

81 Composition
229 Mechanical Properties
33 Physical Properties
8 Heat Treatment
- Metallography
- Machinability

18 Stress-Strain
- Formability
- Fatigue
- Fracture
- Creep

22 Joints
- Coatings
140 Dimensions
- Tribology

1 Corrosion
- Ageing
- Weatherability
- Irradiation

249 Total Suppliers