Bridge Steel Plate

Home » Hot Rolled Steel Plate »

Product

 Code

Dimension

Application

T(mm)

W(m)

L(m)

 

Q235q

 C

 

1.5-3.5

 

 

 

 

 D

12--80

 

 

 

BRIDGE STRUCTURE
STEEL PLATE

Q345q

C

 

1.5-3.5

 

 
Applied in making highway bridge and railway bridge (even Cross-Sea Bridge) with
riveting and stud welded structure

D

12--80

E

 

 

 

GB/T714-2000

Q370q

C

 

1.5-3.5

 

D

12--80

E

 

 

 

 

Q420q

C

 

1.5-3.5

 

 

D

12--80

 

E

 

 

 

 

 

1.1 Code and application
Product
Code
The meaning of Code
Standard
Application
Bridge structure steel
Q345q
Q- initial letter of the pronunciation(Qu fu dian) of chinese words Meaning Yield point
in English The number 345 indicates the value of  Yield point
q- initial letter of the pronunciation(qiao) of chinese words,Meaning bridge
 
GB/T714-2000
Applied in making highway bridge and railway bridge (even Cross-Sea Bridge) with
riveting and stud welded structure
 
Q370q
Q420q
 
1.2 Technical requirements
 
Code
Grade
C
Si
Mn
P
S
Alt
Q235q
C
≤0.20 
≤0.30 
0.40-0.70
≤0.035 
≤0.035 
 
Q335q
D
≤0.18 
≤0.30 
0.50-0.80
≤0.025 
≤0.025 
≥0.020
Q345q
C
≤0.20 
≤0.60 
1.00-1.60
≤0.035 
≤0.035 
 
Q345q
D
≤0.18 
≤0.60 
1.10-1.60
≤0.025 
≤0.025 
≥0.020
Q345q
E
≤0.17 
≤0.50 
1.20-1.60
≤0.020 
≤0.015 
≥0.020
Q370q
C
≤0.18 
≤0.50 
1.20-1.60
≤0.035 
≤0.035 
 
Q370q
D
≤0.17 
≤0.50 
1.20-1.60
≤0.025 
≤0.025 
≥0.020
Q370q
E
≤0.17 
≤0.50 
1.20-1.60
≤0.020 
≤0.015 
≥0.020
Q420q
C
≤0.18 
≤0.50 
1.20-1.60
≤0.035 
≤0.035 
 
Q420q
D
≤0.17 
≤0.60 
1.30-1.70
≤0.025 
≤0.025 
≥0.020
Q420q
E
≤0.17 
≤0.60 
1.30-1.70
≤0.020 
≤0.015 
≥0.020
 To improve steel properties,generally add some elements like V, Nb, Ti and N,its content as below form and be indicated in Material test certificate.         
V  %
Nb  %
Ti  %
N  %
≤0.08
≤0.045
≤0.02
≤0.018
The content of remnant elements like Chromium, nickel, copper: ≤0.30 %
The element C content for different codes of bridge structure steel as below:
Code
Q345q
Q370q
Q420q
Ceq
0.43%
0.44%
0.45%
The value of C content is calculated by the Formula:
            Ceq=C+Mn/6+Si/24+Ni/40+Cr/5+Mo/4+V/14
 
 
1.3 Mechanical Properties of bridge plate
 
Code
Grade
T(mm)
Y.P Mpa
T.S Mpa
 EL.%
V-impact power
(vertical)
 
V-impact ageing impact
180℃ bending test
Thickness
Degree℃
  J
R
≤16
>16
Q235q
 C
 
235
390
26
0
27
-
d=1.5a
d=2.5a
8--80
225
380
 D
 
215
375
-20
27
27
 
205
375
Q345q
 C
 
345
510
21
0
34
 -
d=2a
d=3a
 D
8--80
325
490
20
-20
34
41
 E
 
315
470
20
-40
34
 
305
470
20
Q370q
 C
 
370
530
21
0
41
-
 D
8--80
355
510
20
-20
41
41
 E
 
330
490
20
-40
41
 
330
490
20
Q420q
 C
 
420
570
20
0
47
-
 D
8--80
410
550
19
-20
47
47
 E
 
400
540
19
-40
 
 
390
530
19