PROPRIETARY SIHARD K561 Tool steels

Material group: Ferrous Alloys / Tool steels
Country / Standard: PROPRIETARY

Data updates

Latest Update: 2021-10
Total number of updates: 1
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This material has 27 properties — only a subset is shown here.

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PROPRIETARY SIHARD K561 Chemical Composition

CRITERIA
VALUE
UNIT
CAS NUMBER
CRITERIA
C
VALUE
0.55
UNIT
%
CAS NUMBER
7440-44-0
CRITERIA
Cr
VALUE
8.5
UNIT
%
CAS NUMBER
7440-47-3
CRITERIA
Mn
VALUE
0.3
UNIT
%
CAS NUMBER
7439-96-5
CRITERIA
Mo
VALUE
val1
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UNIT
%
CAS NUMBER
7439-98-7
CRITERIA
Si
VALUE
val1
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UNIT
%
CAS NUMBER
7440-21-3
CRITERIA
V
VALUE
val1
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UNIT
%
CAS NUMBER
7440-62-2
CRITERIA
W
VALUE
val1
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UNIT
%
CAS NUMBER
7440-33-7

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PROPRIETARY SIHARD K561 Physical Properties

Temperature

PROPERTY / VALUE
Modulus of Elasticity
190 — 210 GPa
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Thermal Conductivity
22 W/(m∙°C)
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Density
val1
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kg/dm³
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Poisson Coefficient
val1
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This material has 27 properties — only a subset is shown here.

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PROPRIETARY SIHARD K561 Heat Treatments

  • Annealing: Must be performed after hot working and before rehardening. Heat at a rate not exceeding 50°C/h to reach 820-860°C, and hold at that temperature 1 h for every 25 mm of workpiece thickness, 2 h minimum. Then cool slowly in furnace down to 600°C at a rate not exceeding 20°C/h. Continue cooling to ambient temperature in furnace or in the air. The final hardness should be maximum 250 HB.
    Hardening: Use double preheat. Heat at a rate not exceeding 50°C/h to 620-680°C for equalization, and then continue heating to reach 820-840°C. Heat rapidly from the preheat temperature. Furnace or salt bath 1020-1050°C. Equalize and soak at austenitizing temperature 30 minutes for pieces to 25 mm in thickness, plus 15 minutes for each additional 25 mm of thickness. Quench from a temperature between 1020 and 1050°C/air, oil or inert gas. To increase hardness by 1-2 HRC and dimensional stability after quenching, a sub-zero treatment may be used by cooling steel below -100°C. Tempering immediately after quenching (when material reaches 90-70°C). At least two tempering treatments are recommended to achieve a uniform tempered microstructure. Slowly heat to reach tempering temperature. Holding time in furnace 1 h/25 mm of workpiece, but 2 h minimum. Air cooling. Recommended tempering temperatures are 460-550°C.

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  • -Cross References
  • 7Composition
  • -Mechanical Properties
  • 15Physical Properties
  • 3Heat Treatment
  • 1Metallography
  • -Machinability
  • -Stress-Strain
  • -Formability
  • -Fatigue
  • -Fracture
  • -Creep
  • -Joints
  • -Coatings
  • -Dimensions
  • -Tribology
  • -Corrosion
  • -Ageing
  • -Weatherability
  • -Irradiation
  • 1Total Suppliers