PROPRIETARY Chrome Core 8 Alloy Structural and constructional steels

Material group: Ferrous Alloys / Structural and constructional steels

Country / Standard: PROPRIETARY

Data updates

Latest Update: 2016-02

Total number of updates: 1

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This material has 32 properties — only a subset is shown here.

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PROPRIETARY Chrome Core 8 Alloy Chemical Composition

CRITERIA

VALUE

UNIT

CAS NUMBER

CRITERIA

VALUE

≤ 0.0300

UNIT

CAS NUMBER

7440-44-0

CRITERIA

VALUE

7.5000 – 8.5000

UNIT

CAS NUMBER

7440-47-3

CRITERIA

VALUE

Balance

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

7723-14-0

CRITERIA

VALUE

val1

UNIT

CAS NUMBER

7704-34-9

CRITERIA

VALUE

val1

UNIT

CAS NUMBER

7440-21-3

Carpenter Technology Corporation, Product Data Sheets,

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PROPRIETARY Chrome Core 8 Alloy Physical Properties

Temperature

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

PROPERTY / VALUE

Modulus of Elasticity

190 — 210 GPa

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Electrical Resistivity

0.49 Ω∙mm²/m

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Density

7.67 — 7.86 kg/dm³

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Electrical Conductivity

val1 S/m

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Heat Capacity

val1 J/(kg∙°C)

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Poisson Coefficient

val1

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This material has 32 properties — only a subset is shown here.

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PROPRIETARY Chrome Core 8 Alloy Heat Treatments

Due to the relatively low chromium content, Chrome Core 8 alloy will form austenite if heated to too high a temperature, and some hardening will occur if the austentized part is rapidly cooled. Consequently the best heat treatment for improved soft magnetic properties is to subcritically anneal. The recommended heat treatment practice for Chrome Core 8 alloy is to anneal at a temperature of 780°C +/-14°C (1436°F +/-25°F) for 2 to 4 hours. The cooling rate after the anneal is not critical although rapid cooling and quenching may induce stresses which impair the magnetic characteristics. Any inert annealing atmosphere such as vacuum, inert gases or dry forming gas is satisfactory. Attempts to decarburize the alloy using a wet hydrogen atmosphere are not recommended. Similar heat treating practices can be used to soften the alloy for further forming.

PROPRIETARY Chrome Core 8 Alloy Mechanical Properties

Temperature

0 - 30°C

PROPERTY / VALUE

Tensile Strength

421 MPa

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Elongation, A

40 %

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Reduction of Area

val1 %

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Rockwell Hardness (HR)

val1

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Yield Strength, Rp0.2

228 MPa

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1Cross References

8Composition
5Mechanical Properties
15Physical Properties
1Heat Treatment
-Metallography
-Machinability

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

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