GB Q345C Structural and constructional steels

Material group: Ferrous Alloys / Structural and constructional steels
Country/Standard: China / GB

Data updates

Latest Update: 2025-08
Total number of updates: 14
Update History

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GB Q345C Chemical Composition

CRITERIA
VALUE
UNIT
CAS NUMBER
CRITERIA
Al
VALUE
≥ 0.015
UNIT
%
CAS NUMBER
7429-90-5
CRITERIA
C
VALUE
≤ 0.20
UNIT
%
CAS NUMBER
7440-44-0
CRITERIA
CEV
VALUE
≤ 0.44
UNIT
%
CAS NUMBER
CRITERIA
Cr
VALUE
val1
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UNIT
%
CAS NUMBER
7440-47-3
CRITERIA
Cu
VALUE
val1
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UNIT
%
CAS NUMBER
7440-50-8
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
Pcm
VALUE
val1
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UNIT
%
CAS NUMBER
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

High strength low alloy structural steels, GB/T 1591 / 2008

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GB Q345C 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
0.27 — 0.3
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This material has 9550 properties — only a subset is shown here.

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GB Q345C Heat Treatments

  • Normalized: 880°C to 940°C

GB Q345C Mechanical Properties

Temperature

PROPERTY / VALUE
Yield Strength, Rp0.2
265 MPa
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Tensile Strength
450 — 670 MPa
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Elongation, A
4 %
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Impact Energy
val1
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J
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  • 391 Cross References
  • 110 Composition
  • 106 Mechanical Properties
  • 3 Physical Properties
  • 1 Heat Treatment
  • - Metallography
  • - Machinability
  • - Stress-Strain
  • 1 Formability
  • - Fatigue
  • - Fracture
  • - Creep
  • 83 Joints
  • - Coatings
  • 27 Dimensions
  • 1 Tribology
  • 8491 Corrosion
  • - Ageing
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  • - Irradiation
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