SAE HP 9-4-20 Structural and constructional steels

Material group: Ferrous Alloys / Structural and constructional steels

Country / Standard: United States / SAE

Data updates

Latest Update: 2020-11

Total number of updates: 7

Update History

2020-04 2019-03 2017-02 2015-05 2015-03 2014-06

This material has 192 properties — only a subset is shown here.

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SAE HP 9-4-20 Chemical Composition

CRITERIA

VALUE

UNIT

CAS NUMBER

CRITERIA

VALUE

0.17 – 0.23

UNIT

CAS NUMBER

7440-44-0

CRITERIA

VALUE

4.25 – 4.75

UNIT

CAS NUMBER

7440-48-4

CRITERIA

VALUE

0.65 – 0.85

UNIT

CAS NUMBER

7440-47-3

CRITERIA

VALUE

val1

UNIT

CAS NUMBER

7440-50-8

CRITERIA

VALUE

val1

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

7723-14-0

CRITERIA

VALUE

val1

UNIT

CAS NUMBER

7704-34-9

CRITERIA

VALUE

val1

UNIT

CAS NUMBER

7440-21-3

CRITERIA

VALUE

val1

UNIT

CAS NUMBER

7440-62-2

SAE AMS 6523J: 2022 / Steel, Sheet, Strip, and Plate 0.75Cr - 9.0Ni - 4.5Co - 1.0Mo - 0.09V (0.17 - 0.23C) Vacuum Consumable Electrode Melted, Annealed

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SAE HP 9-4-20 Physical Properties

Temperature

≤ 0°C 0 - 30°C 30 - 100°C 100 - 300°C

PROPERTY / VALUE

Compression Modulus

199 GPa

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Modulus of Elasticity

190 — 210 GPa

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Density

val1 kg/dm³

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Poisson Coefficient

val1

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Shear Modulus

val1 GPa

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Thermal Conductivity

24.57 W/(m∙°C)

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Coefficient of Thermal Expansion (CTE)

val1 10^-6/°C

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This material has 192 properties — only a subset is shown here.

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SAE HP 9-4-20 Heat Treatments

Annealed: heating to 677 ± 14°C (1250 ± 25°F), holding at heat for 4 ± 0.25 hours, cooling to room temperature in air or other atmosphere at a rate equivalent to an air cool, reheating to 621 ± 14°C (1150 ± 25°F), holding at heat for 4 ± 0.25 hours, and cooling to room temperature in air or other atmosphere at a rate equivalent to an air cool. Pyrometry shall be in accordance with AMS2750.
Normalized (prior to annealing): heating to 899 ± 14°C (1650 ± 25°F), holding at heat for not less than 1 hour per 25 mm of maximum thickness but not less than 1 hour, and cooling to room temperature in air or other atmosphere at a rate equivalent to an air cool.
Hardening: heat to 829 ± 14°C (1525 ± 25°F), hold at heat for 1 hour per 25 mm of maximum section thickness but not less than 1 hour, and quench in oil at 16 to 66°C (60 to 150°F), cool within 2 hours after quenching to -68°C (-90 °F) or below for not less than 2 hours, and warm to room temperature.
Tempering: heat to 566 ± 14°C (1050 ± 25°F), hold at heat for not less than 4 hours, and cool in air to room temperature.
Annealing: Heat to 677°C ± 14°C (1250°F ± 25°F), holding at heat for 4 hours ± 0.25 hour, air cool to room temperature, reheating to 621°C ± 14°C (1150°F ± 25°F), hold at heat for 8 hours ± 0.25 hour and cool in air to room temperature
Normalizing: When specified by the purchaser, normalize prior to annealing by heating to 899°C ± 14°C (1650°F ± 25°F), holding at heat for not less than 1 h/25 mm of maximum thickness but not less than 1 hour, and cooling in air to room temperature.

1. Normalized at 899°C ± 14°C (1650°F ± 25°F). Time at temperature: 1 h/25 mm of maximum cross-section. Normalizing may be omitted if the product was supplied normalized and annealed.
2. Cool in air to room temperature.
Hardened at 829°C ± 14°C (1525°F ± 25°F). Time at temperature: 1 h/25 mm of maximum cross-section, but not less than 1 hour.
4.Quenching in oil or water
5.Subzero cool at -68°C (-90°F) or lower within 2 hours. Time at temperature: not less than 2 hours.
6. Warm in air to room temperature
7. Temper (1), within 2 hours of reaching room temperature at 557°C ± 8°C (1035°F ± 15°F). Time at temperature: 2 h/25 mm) of maximum cross-section, but not less than 2 hours. If the first temper cannot be performed within 2 hours of subzero treatment, a snap temper may be performed at 177 to 232°C (350 to 450°F) for 2 h/25 mm of thickness. Then perform double temper steps 7 through 10.
8. Cool to approximately 52°C (125°F) or lower.
9. Temper (2) at 557°C ± 8°C (1035°F ± 15°F). Time at temperature: 2 h/25 mm of maximum cross-section, but not less than 2 hours.
10. Cool in air to room temperature.

SAE HP 9-4-20 Mechanical Properties

Temperature

0 - 30°C

PROPERTY / VALUE

Tensile Strength

≥ 1241 MPa

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Brinell Hardness (HB)

≤ 352

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Compression Yield Strength

val1 MPa

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Elongation, A

≥ 5 %

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Rockwell Hardness (HR)

val1

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Yield Strength, Rp0.2

val1 MPa

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Grain Size

val1

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Reduction of Area

val1 %

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SAE HP 9-4-20 International Equivalent Materials

Showing 7 of 8 results.

MATERIAL

STANDARD

COUNTRY / PRODUCER

EQUIVALENCE CATEGORY

MATERIAL

9Ni-4Co-0.20C

STANDARD

SAE

COUNTRY / PRODUCER

United States

EQUIVALENCE CATEGORY

Identical

MATERIAL

K91472

STANDARD

UNS

COUNTRY / PRODUCER

United States

EQUIVALENCE CATEGORY

Official

MATERIAL

K91461

STANDARD

UNS

COUNTRY / PRODUCER

United States

EQUIVALENCE CATEGORY

Implicit

MATERIAL

9Ni-4Co-0.20C

STANDARD

AISI

COUNTRY / PRODUCER

United States

EQUIVALENCE CATEGORY

Implicit

MATERIAL

A 579 Grade 84 Class 1240 (180)

STANDARD

ASTM

COUNTRY / PRODUCER

United States

EQUIVALENCE CATEGORY

Implicit

MATERIAL

A 646 Grade HP 9-4-20

STANDARD

ASTM

COUNTRY / PRODUCER

United States

EQUIVALENCE CATEGORY

Implicit

MATERIAL

A 646 Grade 16

STANDARD

ASTM

COUNTRY / PRODUCER

United States

EQUIVALENCE CATEGORY

Implicit

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

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See all 8 equivalent grades with detailed mapping by standard, producer and equivalence category.

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8Cross References

22Composition
43Mechanical Properties
16Physical Properties
2Heat Treatment
-Metallography
-Machinability

27Stress-Strain
-Formability
7Fatigue
9Fracture
-Creep

-Joints
-Coatings
56Dimensions
-Tribology

-Corrosion
1Ageing
-Weatherability
-Irradiation

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