|
|
|
Square Pipe
Application:
It is widely used in building, machine, chemical equipment, automobile industrial, container, it is also applied to agriculture and mine machine.
Standard：
ASTM A500, GB6728
Steel grade:
ASTM A500: A, B, C
GB6728：Q195，Q215，Q235，Q345
Standard: ASTM A500
Chemical Composition(%)
|
Chemical Requirement
|
|
|
Composition %
|
|
|
Grade A
|
Grade B
|
|
|
Heat
|
Product
|
Heat
|
Product
|
|
Element
|
analysis
|
analysis
|
analysis
|
analysis
|
|
Carbon max
|
0.26
|
0.3
|
0.22
|
0.26
|
|
Manganese max
|
…
|
…
|
1.4
|
1.45
|
|
Phosphorus, max
|
0.035
|
0.045
|
0.03
|
0.04
|
|
Sulfur max
|
0.035
|
0.045
|
0.02
|
0.03
|
|
Copper, when copper steel is specified, min
|
0.20
|
0.18
|
0.2
|
0.18
|
|
Where an ellipsis (...)appears in this table, there is no requirement
|
|
For each reduction of 0.01 percentage point below the specified maximum for carton, and increase of 0.06 percentage point above the specified maximum for manganese is permitted, up to a maximum of 1.50% by heat analysis and 1.6% by product analysis
|
Mechanical Properties
|
Tensile Requirement
|
|
|
Grade A
|
Grade B
|
|
Tensile strength, min, psi (Mpa)
|
48000 (400)
|
70000 (483)
|
|
Yield strength, min, psi (Mpa)
|
36000 (250)
|
50000 (345)
|
|
Elongation in 2 in. (50.8mm), min, %
|
23
|
23
|
GB6728：
|
SteelGrade
|
CHEMICAL COMPOSITION
|
MECHANICAL PROPERTIES
|
|
|
C (%)
|
Si (%)
|
Mn
(%)
|
P(%)
Max
|
S (%)
Max
|
YS(Mpa)
Min
|
TS(Mpa)
Min
|
El (%)
Min
|
|
Q195
|
0.06-0.012
|
0.3
|
0.25-0.5
|
0.45
|
0.5
|
195
|
315
|
22
|
|
Q215
|
0.09-0.15
|
0.3
|
0.25-0.55
|
0.45
|
0.5
|
215
|
335
|
22
|
|
Q235
|
0.12-0.22
|
0.3
|
0.3-0.7
|
0.45
|
0.45
|
235
|
375
|
20
|
|
Q345
|
0.20
|
0.55
|
1.0-1.6
|
0.45
|
0.45
|
345
|
510
|
21
|
|
|
|
