Limestone Quarry Plant

One of the Top 500 enterprises in China foreign trade

QCCO was approved as a member of “China Association for Contracting Projects Abroad “and granted a membership certificate on Sep 28,2005; “Credibility Rating AAA certificate in Foreign Trade” was granted to QCCO by China Shippers’ Association

 
 

Square Hollow Section,Square steel pipes

Square Steel Tubes

Application:

It is widely used in building, machine, chemical equipment, automobile industrial, container, it is also applied to agriculture and mine machine.

We manufacture a wide range of square hollow section which finds usage in many industries for various applications. We are manufacturing these square hollow sections at our state-of-the-art facility and in compliance with international quality standards.  Our range of products is meticulously tested on various parameters such as tensile strength, flattening, bending, drift expansion, etc. We believe in delivering the highest quality products to our clients and within stipulated time frame. 

Square Hollow Section,Square steel pipes.

Square Hollow Section,Square steel pipes

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

 


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