Carbon structural steel grade, chemical composition, mechanical properties and main purpose carbon structural steel grades and chemical composition Powdered Carbon,Desulfuration Pellet Carbon,Activated Carbon Powder,Coal Based Powdered Activated Carbon NINGXIA TIANFU ACTIVATED CARBON CO.,LTD , https://www.tjfyhxt.com
Brand
grade
Chemical composition (mass fraction) (%)
Deoxygenation method
C
Mn
SP
S
P
≤
Q195
0.06～O.12
O.25～0.50
O.30
O.050
0.045
F, b, Z
Q215
A
O.09~0.15
0.25~0.55
0.30
O.050
O.045
F, b, Z
B
O.045
Q235
A
O.14～O.22
O.30.O.651
0.30
O.050
O.045
F, b, Z
B
0.12～O.20
O.30～0.701
0.045
C
≤0.18
O.35~0.80
0.040
0.040
Z
D
≤0.17
0.035
0.035
TZ
Q255
A
O.18～O.28
O.40～0.70
O.30
O.050
O.045
Z
B
O.045
Q275
0.28～O.38
O.50～O.80
O.35
0.050
0.045
Z
Note: F stands for boiling steel, b stands for semi-killed steel, z stands for killed steel, and TZ stands for special killed steel.
The upper limit of Mn content of 1Q235A and B grade boiling steel is WMn=0.60%.
2 The Si content of the boiling steel Wsi is not more than 0.07%, the Si content of the semi-killed steel Wsi is not more than 0.17%, and the SiSi content of the killed steel is 0.12%.
Yield point of carbon structural steel
Brand
grade
Yield point ós/MPa
Steel thickness or diameter / mm
≤16
>16～40
>40～60
>60～100
>100～150
>150
≥
Q195
195
185
Q215
A, B
215
205
195
185
175
165
Q235
A, B
C, D
235
225
215
205
195
185
Q255
A, B
255
245
235
225
215
205
Q275
275
265
255
245
235
225
Note: The yield point of Q195 is for reference only and is not a delivery condition.
Tensile strength, elongation and impact properties of carbon structural steel
Brand
tensile strength
Ób/MPa
Elongation δ5 (%)
Impact test
Steel thickness or diameter / mm
temperature
/°C
V-type shock absorption work
(vertical) Ak/J
≤16
>16
~40
>40
~60
>60
~100
>100
~150
>150
≥
Q195
315-430
33
32
Q215
335-450
3l
30
29
28
27
26
20
≥27
Q235
375-500
26
25
twenty four
twenty three
twenty two
twenty one
20
≥27
0
-20
Q255
4lO～550
twenty four
twenty three
twenty two
2l
20
19
20
≥27
Q2 75
490～630
20
19
18
17
16
15
Cold bending properties of carbon structural steel
Brand
Sample orientation
180° cold bending test B=2a/mm
60
>60～100
>100～200
Bending diameter d
Q195
vertical
0
horizontal
0.5a
Q215
vertical
0.5a
1.5a
2a
horizontal
a
2a
2.5a
Q235
vertical
a
2a
2.5a
horizontal
1.5a
2.5a
3a
Q255
2a
3a
3.5a
Q275
3a
4a
4.5a
Note: 8 is the width of the sample, and a is the thickness or diameter of the steel.
Characteristics and applications of carbon structural steel
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Brand
Main characteristics
Application examples
Q195
High plasticity, toughness and weldability, good pressure processing properties, but low strength.
Used in the manufacture of anchor bolts, ploughshares, chimneys, roof slabs, rivets, low carbon steel wires, thin plates, welded pipes, tie rods, hooks, brackets, welded structures
Q215
Q235
Good plasticity, toughness and weldability, cold stamping performance, and a certain strength, good cold bending performance
Widely used in general requirements for parts and welded structures. Such as less stressed rods, connecting rods, pins, shafts, screws, nuts, ferrules, brackets, frames, building structures, bridges, etc.
Q255
Good strength, ductility and toughness, good weldability and cold and hot press processing properties
Used to manufacture parts that require less strength, such as bolts, keys, rockers, shafts, tie rods, and various steels, steel plates, etc. for steel structures.
Q275
It has high strength, good plasticity and cutting performance, and certain welding performance. Small parts can be hardened and strengthened
For the manufacture of parts requiring high strength, such as gears, shafts, sprockets, keys, bolts, nuts, steel for agricultural machinery, conveyor chains and chain links
Carbon structural steel