DIN 1.6311 Structural and constructional steels

Material group: Ferrous Alloys / Structural and constructional steels

Country/Standard: Germany / DIN

Data updates

Latest Update: 2024-07

Total number of updates: 23

Update History

2024-03 2024-01 2023-12 2023-09 2023-02 2023-01 2022-12 2022-11 2022-08 2022-04 2022-03 2021-08 2021-07 2021-05 2020-03 2019-09 2017-10 2016-04 2015-04 2014-07 2014-06 2014-04

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DIN 1.6311 Chemical Composition

CRITERIA

VALUE

UNIT

CAS NUMBER

CRITERIA

VALUE

0.1700 – 0.2300

UNIT

CAS NUMBER

7440-44-0

CRITERIA

VALUE

≤ 0.5000

UNIT

CAS NUMBER

7440-47-3

CRITERIA

VALUE

1.0000 – 1.5000

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

Steels for larger forgings; quality regulations, SEW 550 / 1976

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DIN 1.6311 Physical Properties

Temperature

≤ 0°C 0 - 30°C 30 - 100°C 100 - 300°C ≥ 300°C

PROPERTY / VALUE

Modulus of Elasticity

190 — 210 GPa

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Dynamic Modulus of Elasticity

val1 GPa

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Density

val1 kg/dm³

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Poisson Coefficient

val1

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Coefficient of Thermal Expansion (CTE)

val1 10^-6/°C

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Thermal Conductivity

44 — 44.3 W/(m∙°C)

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Heat Capacity

val1 J/(kg∙°C)

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Electrical Resistivity

0.235 Ω∙mm²/m

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Electrical Conductivity

val1 S/m

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This material has 736 properties — only a subset is shown here.

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DIN 1.6311 Heat Treatments

Quenching and tempering: Hardened at 870-940°C, after reaching the temperature in the entire cross-section. Cooled in air, quenched in oil or water according to the thickness.
Tempered at 610-690°C, held for at least 30 min, cooled in still air or in furnace.

Stress relieving: Heated at 580-620°C, holding time for:

t ≤ 15 mm ( ≥ 15 min.)

15 < t ≤ 30 mm ( ≥ 30 min.)

30 < t ≤ 350 mm ( ≥ 60 min.)

t > 350 mm (approx. 120 min)
Operation of hardening - 870-940°C; Hot working 1100-850°C; Soft annealing, 580-620°C; Stress relieving; Temper 610-690°C.

DIN 1.6311 Mechanical Properties

Temperature

≤ 0°C 0 - 30°C 30 - 100°C 100 - 300°C ≥ 300°C

PROPERTY / VALUE

Yield Strength, Rp0.2

390 MPa

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Tensile Strength

550 — 750 MPa

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Elongation, A

14 %

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Impact Energy

val1 J

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