Gold Supplier Building Material Black Steel Square Tube

Min.Order Quantity: 1 Ton

Supply Ability: 4800 Tons / Month

Port: Tianjin port

Certification: SGS、BV、API、CCIC,CE、ISO

Delivery Detail: 10-20 days

Payment Terms: FOB, T/T, L/C,Deferred Payment L/C

Our company accept payment after material  at your warehouse.


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Black Steel Square Tube

Black Steel Square Tube

Use in structures

Black Steel Square Tube, especially rectangular sections, are commonly used in welded steel frames where members experience loading in multiple directions.

Square and circular HSS have very efficient shapes for this multiple-axis loading as they have uniform geometry along two or more cross-sectional axes,

and thus uniform strength characteristics. This makes them good choices for columns. They also have excellent resistance to torsion.

HSS can also be used as beams, although wide flange or I-beam shapes are in many cases a more efficient structural shape for this application. However,

the HSS has superior resistance to lateral torsional buckling.

The flat square surfaces of rectangular HSS can ease construction, and they are sometimes preferred for architectural aesthetics in exposed structures,

although elliptical HSS are becoming more popular in exposed structures for the same aesthetic reasons.

In the recent past, HSS was commonly available in mild steel, such as A500 grade B. Today, HSS is commonly available in mild steel,

A500 grade C. Other steel grades available for HSS are A847 (weathering steel), A1065 (large sections up to 50 inch sq made with SAW process),

and recently approved A1085 (higher strength, tighter tolerances than A500).


Black Steel Square Tube is made the same way as pipe. During the manufacturing process flat steel plate is gradually changed in shape

to become round where the edges are presented ready to weld. The edges are then welded together to form the mother tube.

During the manufacturing process the mother tube goes through a series of shaping stands which form the round HSS (mother tube)

into the final square or rectangular shape. Most American manufacturers adhere to the ASTM A500 or newly adopted ASTM A1085 standards,

while Canadian manufacturers follow both ASTM A500 and CSA G40.21. European hollow sections are generally in accordance with the EN 10210 standard.

Product Name Black Steel Square Tube
Material Q195 similar to a283 GR.B, 040a10, ss330

Q235 similar to a283 GR.D, 080a15,CS type B

Q345 similar to a737 GR.B, SS400, S235JR

Material Chemical Composition
C Mn Si S P
0.06-0.12 0.25-0.50 <=0.30 <=0.050 <=0.045

Tensile strength: 315-430(Mpa)

Yield steength:195(Mpa)



Shape Square                     /    Rectangular
Outer Dia(mm) 15*15mm-1000*1000mm /  10*20mm-700*300mm
Wall Thickness(mm) 0.6-25mm
Length 5.8m-12m
Surface Treatment 1)Black,Pre-galvanized

2)oiled,powder coating

3)Galvanized as your requirement

PS:Pre galvanized steel pipe: 60-150g/m2;Hot dipped galvanized steel pipe: 200-400g/m2

End Finish Plain/ beveled ends or threaded with sockets/coupling and plastic caps.
Packaging Packing in bundle with steel strips; with seaworthy package at the end; could be done with your requirement.
Inspection With Chemical Composition and Mechanical Properties Testing; Hydrostatic Test, Dimensional and Visual Inspection,  With Nondestructive Inspection
Application construction pipe, machine structure pipe, agriculture equipment pipe, water and gas pipe, Greenhouse pipe, Building material, Furniture tube, Low pressure fluid tube, etc
HS Code 7306309000
Others 1:Special design available according to requirement
2:Pipe can be necked dowm, punching hole on pipe wall.
3:Pipe fittings, elbows are available.
4.All production process are under the ISO9001:2000 strictly


Black Steel Square Tube

(1).Machinery manufacture: glass, agricultural, textile, papermaking machinery, electrical equipment, sanitation equipment.

(2).Roads and Bridges: railway, expressway, overpass, road fence, traffic signs.

(3).Construction engineering: steel structure construction, sports venue, three-dimensional garage, exhibition hall.

(4).Decoration: wrought iron doors and windows, outdoor advertising, pavilion and vestibule, glass curtain wall.

(5).Transportation: automobile manufacture, ship manufacture, container, tricycle, tower crane.


Black Steel Square Tube

• Reasonable price with excellent quality
• Abundant stock and prompt delivery
• Rich supply and export experience, sincere service
• Reliable forwarder, 2-hour away from port.

Pls contact me

Sales Manager
Cangzhou Zhongshun Steel Pipe Trade Co.,Ltd.
Add: 101, Cangzhou Custom House Building, Cangzhou City, Hebei Province, China
Tel: +86-18903179350         Fax: 0086-317-2159105
SKYPE ID: +86-18903179350


Global Business

1. More than 10 years of sales experience

2. Product exported more than 150 countries

3. Arrange to produce according yo customer's request

Fast Delivery

1. AA level customs broker,Faster through

2. 20 years of experience in the freight forwarding company

3. Delivery Detail: 10-20 days

Trusted Quality

1. Certificate: API, CE, ISO9001.2000.MTC etc

2. Inspection: BV,SGS,others is avaliable.

3. A complete testing system and testing equipments

One-Step Service

1. Free sample can be provided

2. Small order is acceptable

3. OEM is acceptable

4. Any third party testing is acceptable




  • Phone0086-317-2159105


  • Phone0086-317-2159106