THE SG255 steel plate is characterised by a minimum yield strength of 245 - 355 MPa and by good weldability. The user of SG255 steel grades must make sure that his calculation, design and processing methods are appropriate for the material. The SG255 steel grades of this series are used for manufacturing gas cylinders by welding cold-formed parts together and normalizing the finished cylinder.
JIS G 3116-2000
|
Symbol
|
Chemical composition
|
||||
|
C
max
|
Si
max
|
Mn
max
|
P
max
|
S
max
|
|
|
0.20
|
-
|
0.30
|
0.040
|
0.040
|
|
|
0.20
|
0.35
|
1.00
|
0.040
|
0.040
|
|
|
0.20
|
0.55
|
1.50
|
0.040
|
0.040
|
|
|
0.20
|
0.55
|
1.50
|
0.040
|
0.040
|
|
SG255 steel plate Mechanical properties
|
Symbol
|
Yield point or proof stress
N/mm2 (min)
|
Tensile strength
N/mm2 min
|
Elongation % min
|
Tensile test piece
|
Bendability
|
||
|
Bending
Angle
|
Inside radius
|
Test piece
|
|||||
|
255
|
400
|
26
|
NO.5 in rolling direction
|
180°
|
Thickness x 1.0
|
No.3 in rolling direction
|
|
|
295
|
440
|
26
|
180°
|
Thickness x 1.5
|
|||
|
325
|
490
|
22
|
180°
|
||||
|
365
|
540
|
20
|
180°
|
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Source:
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