AFNOR NF 18 MD 4.05 Structural and constructional steels

Material group: Ferrous Alloys / Structural and constructional steels

Country / Standard: France / AFNOR NF

Data updates

Latest Update: 2022-05

Total number of updates: 2

Update History

2020-03

This material has 128 properties — only a subset is shown here.

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AFNOR NF 18 MD 4.05 Chemical Composition

CRITERIA

VALUE

UNIT

CAS NUMBER

CRITERIA

VALUE

≤ 0.20

UNIT

CAS NUMBER

7440-44-0

CRITERIA

VALUE

≤ 0.30

UNIT

CAS NUMBER

7440-47-3

CRITERIA

VALUE

≤ 0.25

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

NF A 36-602: 1988 / Weldable steel forgings for boilers and pressure vessels. Mo, Mn-Mo and Cr-Mo alloy steels. Grades and types

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AFNOR NF 18 MD 4.05 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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Thermal Conductivity

val1 W/(m∙°C)

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Density

val1 kg/dm³

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Poisson Coefficient

val1

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This material has 128 properties — only a subset is shown here.

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AFNOR NF 18 MD 4.05 Heat Treatments

Austenitized: 875-925°C; Tempering: 600°C minimum.
Normalising: 875-925°C, air or water cooled.
Tempering: 600-675°C.
Mechanical characteristics are also guaranteed after the following relaxation treatment:
- temperature rise 55°C/h from 300°C
- temperature maintenance at ± 5 °C, at a value taken in the temperature range 580 - 620°C
- temperature holding time 2 min/mm up to 60 mm thickness + 0.5 min/mm above 60 mm thickness
- temperature drop 55°C/h down to 300°C then air cooling

AFNOR NF 18 MD 4.05 Mechanical Properties

Temperature

≤ 0°C 0 - 30°C 100 - 300°C ≥ 300°C

PROPERTY / VALUE

Tensile Strength

510 — 650 MPa

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Elongation, A

≥ 19 %

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Impact Strength

val1 kJ/m²

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Yield Strength, Rp0.2

val1 MPa

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Impact Energy

val1 J

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-Cross References

29Composition
44Mechanical Properties
39Physical Properties
3Heat Treatment
-Metallography
-Machinability

6Stress-Strain
-Formability
-Fatigue
-Fracture
1Creep

5Joints
-Coatings
-Dimensions
-Tribology

-Corrosion
-Ageing
-Weatherability
-Irradiation

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