DIN 1.8871 Structural and constructional steels

Material group: Ferrous Alloys / Structural and constructional steels
Country/Standard: Germany / DIN

Data updates

Latest Update: 2022-08
Total number of updates: 8
Update History

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DIN 1.8871 Chemical Composition

CRITERIA
VALUE
UNIT
CAS NUMBER
CRITERIA
B
VALUE
≤ 0.0050
UNIT
%
CAS NUMBER
7440-42-8
CRITERIA
C
VALUE
≤ 0.1800
UNIT
%
CAS NUMBER
7440-44-0
CRITERIA
Cr
VALUE
≤ 0.5000
UNIT
%
CAS NUMBER
7440-47-3
CRITERIA
Cu
VALUE
val1
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UNIT
%
CAS NUMBER
7440-50-8
CRITERIA
Cu+6Sn
VALUE
val1
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UNIT
%
CAS NUMBER
CRITERIA
Mn
VALUE
val1
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UNIT
%
CAS NUMBER
7439-96-5
CRITERIA
Mo
VALUE
val1
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UNIT
%
CAS NUMBER
7439-98-7
CRITERIA
N
VALUE
val1
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UNIT
%
CAS NUMBER
7727-37-9; 17778-88-0
CRITERIA
Nb
VALUE
val1
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UNIT
%
CAS NUMBER
7440-03-1
CRITERIA
Ni
VALUE
val1
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UNIT
%
CAS NUMBER
7440-02-0
CRITERIA
P
VALUE
val1
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UNIT
%
CAS NUMBER
7723-14-0
CRITERIA
S
VALUE
val1
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UNIT
%
CAS NUMBER
7704-34-9
CRITERIA
Si
VALUE
val1
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UNIT
%
CAS NUMBER
7440-21-3
CRITERIA
Ti
VALUE
val1
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UNIT
%
CAS NUMBER
7440-32-6
CRITERIA
V
VALUE
val1
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UNIT
%
CAS NUMBER
7440-62-2
CRITERIA
Zr
VALUE
val1
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UNIT
%
CAS NUMBER
7440-67-7

EN 10028-6: 2017 / Flat products made of steels for pressure purposes - Part 6: Weldable fine grain steels, quenched and tempered

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DIN 1.8871 Physical Properties

Temperature

PROPERTY / VALUE
Modulus of Elasticity
190 — 210 GPa
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Density
7.67 — 7.86 kg/dm³
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Poisson Coefficient
val1
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Service Temperature
-20 °C
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DIN 1.8871 Heat Treatments

  • Quenched and tempered: 860-940°C, cooled in oil, polymer or water. Tempered at 600-700°C.
  • Quenching and tempering:
    Hardening at 860-940°C, after the temperature has been reached, quench the entire cross-section in water or oil, or cool in air.
    Tempering at 560-700°C, holding time at least 30 min, cool down in still air.

    Normal annealing 880-960°C, after reaching the temperature, cool the entire cross-section in still air.

    Three stage heat treatment:
    Hardening at 860-940°C / water
    750-780°C / water
    Tempering at 600-630°C.

    Heat treatment after welding:
    Stress relief annealing at 530-580°C. Cooling down in still air or in the oven. The duration required for the specified annealing temperatures includes this warming up and keeping within the temperature range and depends on the thickness of the components. When measuring for the annealing temperature on the component surface, depending on the thickness, the following guide values are recommended:
    ≤ 15 mm at least 15 min
    > 15 mm to ≤ 30 mm at least 30 min
    > 30 mm to ≤ 350 mm at least 60 min
    > 350 mm approx. 120 min.
    The maximum holding time for the usual stress relief annealing is 150 minutes. With a holding time > 90 min or with multiple anneals, the lower limit of the temperature range should be aimed for.

DIN 1.8871 Mechanical Properties

Temperature

PROPERTY / VALUE
Yield Strength, Rp0.2
380 MPa
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Tensile Strength
500 — 730 MPa
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Elongation, A
18 %
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Impact Energy
val1
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J
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