ISO 24CrMo4 Structural and constructional steels

Material group: Ferrous Alloys / Structural and constructional steels

Country/Standard: International / ISO

Data updates

Latest Update: 2024-01

Total number of updates: 6

Update History

2023-12 2019-06 2016-09 2015-05 2014-12

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ISO 24CrMo4 Chemical Composition

CRITERIA

VALUE

UNIT

CAS NUMBER

CRITERIA

VALUE

0.20 – 0.27

UNIT

CAS NUMBER

7440-44-0

CRITERIA

VALUE

0.90 – 1.20

UNIT

CAS NUMBER

7440-47-3

CRITERIA

VALUE

≤ 0.40

UNIT

CAS NUMBER

7440-50-8

CRITERIA

VALUE

val1

UNIT

CAS NUMBER

7439-96-5

CRITERIA

VALUE

val1

UNIT

CAS NUMBER

7439-98-7

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

ISO 683-11: 2012 / Heat-treatable steels, alloy steels and free-cutting steels - Part 11: Wrought case-hardening steels

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ISO 24CrMo4 Physical Properties

Temperature

0 - 30°C

PROPERTY / VALUE

Modulus of Elasticity

190 — 210 GPa

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Density

7.67 — 7.86 kg/dm³

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Poisson Coefficient

0.27 — 0.3

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ISO 24CrMo4 Heat Treatments

End quench test austenitizing temperature: 900 ± 5°C, 30 min. minimum; Carburizing temperature: 880°-980°C (temperature depends on the chemical composition of the steel, the mass of the product and the carburizing medium. If the steels are direct hardened, in general, a temperature of 950°C is not exceeded. For special procedures, for example under vacuum, higher temperatures (for example 1 020°C to 1 050°C) are not unusual; Direct and Simple hardening temperature: 820 to 860°C; Double hardening: Core-hardening temperature 860° to 900°C or Case hardening temperature 780° to 820°C; Tempering temperature: 150° to 200°C, 1h minimum;
End quench test austenitizing at 900 ± 5°C (Time for austenitizing as a guide: 30 min minimum);

Carburizing at 880-980°C (The carburizing temperature depends on the chemical composition of the steel, the mass of the product and the carburizing medium. If the steels are direct hardened, in general, a temperature of 950°C is not exceeded. For special procedures, for example under vacuum, higher temperatures (for example 1020-1050°C) are not unusual);

Direct and simple hardening at 820-860°C (The kind of quenching agent depends on, for example the shape of the products, the cooling conditions and the amount of furnace filling. If the steels are direct hardened and if there is a danger of distortion, they should be quenched from a temperature between the core-hardening and case-hardening temperatures);

Double hardening: Core-hardening at 860-900°C and Case-hardening at 780-820°C;

Tempering at 150-200°C (Time for tempering as a guide: 1h minimum).

ISO 24CrMo4 Mechanical Properties

Temperature

0 - 30°C

PROPERTY / VALUE

Brinell Hardness (HB)

≤ 270

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Grain Size

Fine grain steel shall have an austenite grain size of 5 or finer. Sampling and sample preparation shall be as specified in ISO 643. The grain size shall be determined from a carburized specimen. Carburization shall be achieved by maintaining the specimen in carburizing powder at 950°C ± 10°C for 6 h. This is generally done by keeping the carburizing chamber at 950°C ± 10°C for 8 h, including a preheating period. In most cases, a carburized layer of approximately 1 mm is obtained.; Steel shall have an austenite grain size of 5 or finer in accordance with ISO 643.

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157 Cross References

32 Composition
29 Mechanical Properties
3 Physical Properties
5 Heat Treatment
- Metallography
- Machinability

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

- Joints
- Coatings
9 Dimensions
- Tribology

- Corrosion
- Ageing
- Weatherability
- Irradiation

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