UNI X9CrNi18-9 Stainless steels

Material group: Ferrous Alloys / Stainless steels

Country/Standard: Italy / UNI

Data updates

Latest Update: 2020-10

Total number of updates: 4

Update History

2016-11 2015-02 2015-01

This material has 480 properties — only a subset is shown here.

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UNI X9CrNi18-9 Chemical Composition

CRITERIA

VALUE

UNIT

CAS NUMBER

CRITERIA

VALUE

0.030 – 0.15

UNIT

CAS NUMBER

7440-44-0

CRITERIA

VALUE

17.0 – 19.0

UNIT

CAS NUMBER

7440-47-3

CRITERIA

VALUE

≤ 2.00

UNIT

CAS NUMBER

7439-96-5

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 X9CrNi18-9 Physical Properties

Temperature

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

PROPERTY / VALUE

Modulus of Elasticity

180 — 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

0.73 Ω∙mm²/m

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Electrical Conductivity

val1 S/m

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This material has 480 properties — only a subset is shown here.

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UNI X9CrNi18-9 Heat Treatments

Heat treated at 350-400°C; Duration: 30 min to 1 h; Air cooling; The optimum heat treatment conditions may be very different. The spring manufacturer shall choose those conditions answering the purpose; The heat treatment data refer to compression springs, torsion and tension (springs without initial tension).
Hot working (air cooling): 1200-900°C; +AT - Solution annealing (air or water cooling): 1000-1100°C.

Hot formed conditions:
1U - Hot formed, not heat treated, not descaled.
1C - Hot formed, heat treated, not descaled.
1E - Hot formed, heat treated, mechanically descaled.
1D - Hot formed, heat treated, pickled, coated (optional).
1X - Hot formed, heat treated, rough machined.
1G - Hot formed, heat treated, descaled, rough machined or shaved in the case of rod.
Cold processed conditions:
2H - Finishes 1E, 1D or 1X, cold processed, coated (optional).
2D - Finish 2H, heat treated, pickled and skin- passed (optional), coated (optional).
2B - Finishes 1E, 1D or 1X, cold processed, mechanically smoothed.
2G - Finishes 2H, 2D or 2B, centreless ground, mechanically smoothed (optional).
P - Finishes 2H, 2D, 2B or 2G, specular polishing.

UNI X9CrNi18-9 Mechanical Properties

Temperature

0 - 30°C

PROPERTY / VALUE

Yield Strength, Rp0.2

val1 MPa

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Yield Strength, Rp1

val1 MPa

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Tensile Strength

550 — 2400 MPa

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Elongation, A

40 %

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Brinell Hardness (HB)

≤ 215

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233 Cross References

22 Composition
19 Mechanical Properties
23 Physical Properties
2 Heat Treatment
- Metallography
1 Machinability

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

- Joints
- Coatings
3 Dimensions
- Tribology

- Corrosion
- Ageing
- Weatherability
- Irradiation

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