PROPRIETARY Böhler Uddeholm S7 Mold Quality Tool steels

Material group: Ferrous Alloys / Tool steels

Country / Standard: PROPRIETARY

Data updates

Latest Update: 2017-07

Total number of updates: 1

Update History

This material has 30 properties — only a subset is shown here.

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PROPRIETARY Böhler Uddeholm S7 Mold Quality Chemical Composition

CRITERIA

VALUE

UNIT

CAS NUMBER

CRITERIA

VALUE

0.5300

UNIT

CAS NUMBER

7440-44-0

CRITERIA

VALUE

3.2000

UNIT

CAS NUMBER

7440-47-3

CRITERIA

VALUE

0.7000

UNIT

CAS NUMBER

7439-96-5

CRITERIA

VALUE

val1

UNIT

CAS NUMBER

7439-98-7

CRITERIA

VALUE

val1

UNIT

CAS NUMBER

7704-34-9

CRITERIA

VALUE

val1

UNIT

CAS NUMBER

7440-21-3

Böhler-Uddeholm AG, Product Data Sheets,

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PROPRIETARY Böhler Uddeholm S7 Mold Quality Physical Properties

Temperature

0 - 30°C 100 - 300°C ≥ 300°C

PROPERTY / VALUE

Modulus of Elasticity

190 — 210 GPa

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Thermal Conductivity

val1 W/(m∙°C)

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Density

val1 kg/dm³

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Heat Capacity

val1 J/(kg∙°C)

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Poisson Coefficient

val1

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This material has 30 properties — only a subset is shown here.

Unlock detailed physical values across temperatures and conditions.

PROPRIETARY Böhler Uddeholm S7 Mold Quality Heat Treatments

Soft annealing: Protect the steel and heat through to 830°C. Then cool in the furnace at 10°C per hour to 540°C, then freely in air.
Stress relieving: After rough machining the tool should be heated through to 650°C, holding time 2 hr. Cool slowly to 500°C, then freely in air.
Hardening: Preheating temperature: 600-700°C. Austenitizing temperature: 920-970°C, but normally 940°C. Hardness before tempering:
At 920°C (soaking time 60 min.) approx. 59 HRC
At 940°C (soaking time 45 min.) approx. 60 HRC
At 960°C (soaking time 30 min.) approx. 60 HRC Soaking time=time at hardening temperature after the tool is fully heated through. Protect the part against decarburization and oxidation during hardening.
Quenching media: Vacuum furnace with sufficient overpressure; Forced air or gas; Martempering bath at 180–250°C, then cool in air; Oil (may be a consideration for large cross sections) Note 1: Quenching in oil increases the risk for distortion and cracking. Note 2: Temper the tool as soon as its temperature reaches 50-70°C. Hardness, grain size and retained austenite as a function of the austenitizing temperature.
Tempering: Choose the tempering temperature according to the hardness required by reference to the tempering graph. Temper twice with intermediate cooling to room temperature. Lowest recommended tempering temperature 230°C. Holding time at temperature minimum 2 hr.

PROPRIETARY Böhler Uddeholm S7 Mold Quality Mechanical Properties

Temperature

0 - 30°C

PROPERTY / VALUE

Compression Yield Strength

1380 — 2070 MPa

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-Cross References

6Composition
4Mechanical Properties
15Physical Properties
4Heat Treatment
-Metallography
-Machinability

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

-Joints
-Coatings
-Dimensions
-Tribology

-Corrosion
-Ageing
-Weatherability
-Irradiation

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