PROPRIETARY WM A-8 Tool steels

Material group: Ferrous Alloys / Tool steels

Country / Standard: PROPRIETARY

Data updates

Latest Update: 2018-07

Total number of updates: 2

Update History

2018-05

This material has 60 properties — only a subset is shown here.

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PROPRIETARY WM A-8 Chemical Composition

CRITERIA

VALUE

UNIT

CAS NUMBER

CRITERIA

VALUE

0.55

UNIT

CAS NUMBER

7440-44-0

CRITERIA

VALUE

5.00

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

7440-33-7

Ellwood Specialty Steel, Product Data Sheets,

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PROPRIETARY WM A-8 Physical Properties

Temperature

0 - 30°C ≥ 300°C

PROPERTY / VALUE

Modulus of Elasticity

190 — 210 GPa

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Density

7.72 — 8 kg/dm³

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Poisson Coefficient

0.27 — 0.3

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This material has 60 properties — only a subset is shown here.

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PROPRIETARY WM A-8 Heat Treatments

Preheating: Heat at a rate not exceeding 400°F per hour to 1400-1450°F and equalize.
Austenitizing (high heat): Heat slowly from the preheat. Furnace or Salt: 1825-1850°F. Soak for 30 minutes for the first inch of thickness, plus 15 minutes for each additional inch.
Quenching: Air, pressurized gas, or interrupted oil to 150-125°F. Note: Sizes over 5 inches in cross section may not achieve full hardness by cooling in still air. It is usually necessary to increase the quench cooling rate between 1400 to 900°F by using an air blast, pressurized gas, or an interrupted oil quench. For the oil quench, quench until black, about 900°F, then cool in still air to 150-125°F.
Tempering: Temper immediately after quenching. Hold temperature for 1 hour per inch of thickness, 2 hours minimum, then air cool to ambient temperature. The typical tempering range is 300 to 600°F. Double tempering is recommended for tempering temperatures of 900°F and higher. To minimize internal stresses in cross sections greater than 6 inches and to improve stability in tools that will be EDM’d after heat treatment, a soaking time of 4 to 6 hours at the tempering temperature is strongly recommended. Cryogenic Treatment: Some prefer to do cryogenic treatment as an extension of the quench from the austenitizing treatment. Others prefer to cryogenically treat after tempering.
Annealing: Annealing must be performed after hot working and before rehardening. Heat at a rate not exceeding 400°F per hour to 1550°F, and hold at temperature for 1 hour per inch of maximum thickness; 2 hours minimum. Then cool slowly with the furnace at a rate not exceeding 50°F per hour to 1000°F Continue cooling to ambient temperature in the furnace or in air. The resultant hardness should be a maximum of 241 HBW.

PROPRIETARY WM A-8 Mechanical Properties

Temperature

0 - 30°C

PROPERTY / VALUE

Tensile Strength

710 — 2048 MPa

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Elongation, A

9 — 24 %

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Impact Energy

val1 J

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Reduction of Area

val1 %

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Rockwell Hardness (HR)

val1

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Yield Strength, Rp0.2

448 — 1724 MPa

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PROPRIETARY WM A-8 International Equivalent Materials

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MATERIAL

STANDARD

COUNTRY / PRODUCER

EQUIVALENCE CATEGORY

MATERIAL

LSS MGR

STANDARD

PROPRIETARY

COUNTRY / PRODUCER

EQUIVALENCE CATEGORY

Composition 100%

Equivalence categories reflect chemical-composition and mechanical-property comparison — always verify suitability against the governing specification for your application.

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1Cross References

6Composition
42Mechanical Properties
7Physical Properties
2Heat Treatment
-Metallography
-Machinability

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

-Joints
-Coatings
-Dimensions
-Tribology

-Corrosion
-Ageing
-Weatherability
-Irradiation

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