PROPRIETARY BÖHLER K888 Matrix Tool steels

Material group: Ferrous Alloys / Tool steels

Country / Standard: PROPRIETARY

Data updates

Latest Update: 2025-01

Total number of updates: 2

Update History

2024-12

This material has 48 properties — only a subset is shown here.

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PROPRIETARY BÖHLER K888 Matrix Chemical Composition

CRITERIA

VALUE

UNIT

CAS NUMBER

CRITERIA

VALUE

0.60

UNIT

CAS NUMBER

7440-44-0

CRITERIA

VALUE

3.80

UNIT

CAS NUMBER

7440-48-4

CRITERIA

VALUE

4.40

UNIT

CAS NUMBER

7440-47-3

CRITERIA

VALUE

val1

UNIT

CAS NUMBER

7439-98-7

CRITERIA

VALUE

val1

UNIT

CAS NUMBER

7440-21-3

CRITERIA

VALUE

val1

UNIT

CAS NUMBER

7440-62-2

CRITERIA

VALUE

val1

UNIT

CAS NUMBER

7440-33-7

Böhler Edelstahl, Product Data Sheets,

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PROPRIETARY BÖHLER K888 Matrix Physical Properties

Temperature

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

PROPERTY / VALUE

Modulus of Elasticity

190 — 218 GPa

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Electrical Resistivity

0.5 Ω∙mm²/m

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Density

val1 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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Thermal Conductivity

20.8 W/(m∙°C)

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Poisson Coefficient

val1

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This material has 48 properties — only a subset is shown here.

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PROPRIETARY BÖHLER K888 Matrix Heat Treatments

Stress relieving: 650-700°C (1202-1292°F). After through heating, hold in neutral atmosphere for 1-2 hours. Slow cooling in furnace. Intended to relieve stresses caused by extensive machining or in complex shapes.

Hardening and Tempering: 1070-1120°C (1958-2048°F). Quenching: Oil, gas (N₂). Holding time after temperature equalization: 20-30 minutes (hardening temperature 1070 to 1100°C (1958 to 2012°F)) or 10 minutes (hardening temperature 1120°C (2048°F). After hardening, tempering to the desired working hardness according to the tempering chart.

PROPRIETARY BÖHLER K888 Matrix Mechanical Properties

Temperature

0 - 30°C

PROPERTY / VALUE

Brinell Hardness (HB)

≤ 280

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Rockwell Hardness (HR)

56.1 — 65.1

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-Cross References

7Composition
22Mechanical Properties
16Physical Properties
2Heat Treatment
-Metallography
-Machinability

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

-Joints
-Coatings
-Dimensions
-Tribology

-Corrosion
-Ageing
-Weatherability
-Irradiation

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