Specifications: diameter: 320 to 127 mm thickness: 0.4 to 12.7 mm Length: 6 m above, and, in accordance with customer demand, supply and other specifications of steel pipe

Carbon Steel Square Pipes


Carbon Steel Square Tubes

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

Carbon Steel Square Pipes

 

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

 

GB6728:

 

SteelGrade

CHEMICAL COMPOSITION

MECHANICAL PROPERTIES

 

 

 

C (%)

 

Si (%)

 

Mn

 

(%)

 

 

 

P(%)

 

 

 

Max

 

 

 (%)

 

 

 

Max

 

 

 

YS(Mpa)

 

 

 

Min

 

 

 

TS(Mpa)

 

 

 

Min

 

 

 

El (%)

 

 

 

Min

 

Q195

 

.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

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

 

 

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