UNI 20 Mn 6 Structural and constructional steels

Material group: Ferrous Alloys / Structural and constructional steels

Country / Standard: Italy / UNI

Data updates

Latest Update: 2020-06

Total number of updates: 2

Update History

2019-07

This material has 8615 properties — only a subset is shown here.

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UNI 20 Mn 6 Chemical Composition

CRITERIA

VALUE

UNIT

CAS NUMBER

CRITERIA

VALUE

0.17 – 0.25

UNIT

CAS NUMBER

7440-44-0

CRITERIA

VALUE

≤ 0.25

UNIT

CAS NUMBER

7440-47-3

CRITERIA

VALUE

1.3 – 1.7

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

UNI 6930: 1971 / Aircraft metallic materials. Hardening and tempering low alloyed steel, weldable (C 0,21% and Mn 1,50%)

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UNI 20 Mn 6 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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Electrical Resistivity

0.17 Ω∙mm²/m

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Density

val1 kg/dm³

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Thermal Conductivity

46.861 W/(m∙°C)

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Electrical Conductivity

val1 S/m

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Poisson Coefficient

val1

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This material has 8615 properties — only a subset is shown here.

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UNI 20 Mn 6 Heat Treatments

Annealing: Heat to 680 - 720°C, hold for a minimum of 2 hours then slow cool in the furnace (approximately 50°C/hour) to 500°C or below, followed by cooling to room temperature in still air. Normalizing: Heat to 870 - 890°C, hold for a sufficient time to complete the transformation, then cool in still air. Final Heat Treatment: Harden by water quenching from 840 - 860°C, followed by tempering at 600 - 630°C for one hour. Sheet and strip shall be produced using either the hot or cold rolled process.

UNI 20 Mn 6 Mechanical Properties

Temperature

0 - 30°C

PROPERTY / VALUE

Tensile Strength

539 — 981 MPa

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Brinell Hardness (HB)

153 — 289

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Elongation, A

≥ 10 %

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Yield Strength, Rp0.2

val1 MPa

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8Cross References

8Composition
9Mechanical Properties
11Physical Properties
1Heat Treatment
-Metallography
-Machinability

2Stress-Strain
1Formability
-Fatigue
-Fracture
-Creep

83Joints
-Coatings
-Dimensions
1Tribology

8491Corrosion
-Ageing
-Weatherability
-Irradiation

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