PROPRIETARY BÖHLER M303 EXTRA Stainless steels

Material group: Ferrous Alloys / Stainless steels

Country / Standard: PROPRIETARY

Data updates

Latest Update: 2021-06

Total number of updates: 2

Update History

2021-04

This material has 58 properties — only a subset is shown here.

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PROPRIETARY BÖHLER M303 EXTRA Chemical Composition

CRITERIA

VALUE

UNIT

CAS NUMBER

CRITERIA

VALUE

0.27

UNIT

CAS NUMBER

7440-44-0

CRITERIA

VALUE

14.50

UNIT

CAS NUMBER

7440-47-3

CRITERIA

VALUE

0.65

UNIT

CAS NUMBER

7439-96-5

CRITERIA

VALUE

val1

UNIT

CAS NUMBER

7439-98-7

CRITERIA

VALUE

val1

UNIT

CAS NUMBER

7440-02-0

CRITERIA

VALUE

val1

UNIT

CAS NUMBER

7440-21-3

Böhler Edelstahl, Product Data Sheets,

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PROPRIETARY BÖHLER M303 EXTRA 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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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 58 properties — only a subset is shown here.

Unlock detailed physical values across temperatures and conditions.

PROPRIETARY BÖHLER M303 EXTRA Heat Treatments

Stress relieving after machining in the pre-hardened condition max. 400°C (750°F), after through-heating, soak for minimum 2 hours in a neutral atmosphere. Slow cooling in furnace with 20°C/hr (36°F/hr) down to 200°C (390°F), then in air. In case a higher hardness is required, following procedure is recommended: Annealing 700 to 725°C (1290 - 1340°F), minimum 25 hours after through-heating. Slow, controlled cooling in furnace at a rate of 10 to 20°C/hr (18 – 36°F/hr) down to approx. 500°C (930°F), further cooling in air. Stress relieving after machining in the annealed condition approx. 650°C (1200°F). After through-heating, soak for 1 - 2 hours in a neutral atmosphere. Slow cooling in furnace with 20°C/hr (36°F/hr) down to 300°C (570°F), then in air. Hardening 1000 to 1020°C (1830 - 1870°F)/oil, N2, salt bath (400 to 450°C [750 - 840°F]). After through-heating, hold for 15 to 30 minutes. Tempering Slow heating to tempering temperature immediately after hardening. Time in furnace 1 hour for each 20 mm (0.79 inch) of workpiece thickness, but at least 2 hours. We recommend the tempering at least twice. A third tempering for stress relieving 30 - 50°C (85 - 120°F) below tempering temperature is of advantage. For information on the average hardness figures obtained after tempering please refer to the tempering chart.

PROPRIETARY BÖHLER M303 EXTRA Mechanical Properties

Temperature

0 - 30°C

PROPERTY / VALUE

Brinell Hardness (HB)

290 — 390

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Rockwell Hardness (HR)

31.1 — 50.3

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2Cross References

6Composition
8Mechanical Properties
37Physical Properties
3Heat Treatment
-Metallography
-Machinability

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

-Joints
-Coatings
-Dimensions
-Tribology

-Corrosion
-Ageing
-Weatherability
-Irradiation

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