PROPRIETARY SIHARD S671 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 S671 Chemical Composition

CRITERIA

VALUE

UNIT

CAS NUMBER

CRITERIA

VALUE

1.25

UNIT

CAS NUMBER

7440-44-0

CRITERIA

VALUE

10.00

UNIT

CAS NUMBER

7440-47-3

CRITERIA

VALUE

0.30

UNIT

CAS NUMBER

7439-96-5

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

SIJ Metal Ravne, Product Data Sheets,

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PROPRIETARY SIHARD S671 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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Thermal Conductivity

22.3 W/(m∙°C)

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Density

val1 kg/dm³

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Poisson Coefficient

val1

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This material has 27 properties — only a subset is shown here.

Unlock detailed physical values across temperatures and conditions.

PROPRIETARY SIHARD S671 Heat Treatments

Annealing: Heat at a rate not exceeding 50°C/h to reach 820-860°C and hold at that temperature for 1 h for every 25 mm of workpiece thickness, 2 hours minimum. Then cool down slowly in furnace to 600°C at a rate not exceeding 20°C per h. Continue cooling to ambient temperature in furnace or in the air. The final hardness should be maximum 250 HBW.
Hardening: To minimize distortion and stresses in large or complex tools 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. For normal tools, use only the second temperature range as a single preheating treatment. Heat rapidly from the preheat temperature. Furnace or salt bath at 1020-1070°C. Equalize and soak at austenitizing temperature for 30 minutes for pieces up to 25 mm in thickness, plus 15 minutes for each additional 25 mm of thickness. Quenching at 1020 to 1070°C / air, oil or inert gas. To increase as quenched hardness by 2-4 HRC and dimensional stability after quenching, sub-zero treatment may be used, hardness in the as quenched condition may be increased when steel is cooled at temperatures below -40°C (CO₂). Temper 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 for every 25 mm of workpiece thickness, but 2 h minimum. This is followed by air cooling. Recommended tempering temperatures are in the range of 450 to 550°C. If surface treatment is to be applied, then tempering temperature has to be 20-30°C higher than the temperature at which steel is treated.

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-Cross References

6Composition
-Mechanical Properties
16Physical Properties
3Heat Treatment
1Metallography
-Machinability

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

-Joints
-Coatings
-Dimensions
-Tribology

-Corrosion
-Ageing
-Weatherability
-Irradiation

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