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  • High-Quality Square Steel Pipe

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High-Quality Square Steel Pipe
High-quality square steel pipes are cold-formed or hot-rolled structural hollow sections with precise dimensional accuracy and excellent mechanical properties. These pipes feature uniform wall thickness, sharp corners, and straight edges, making them ideal for structural frameworks, architectural applications, and mechanical components.
Phone：+86 18954208811
Email：info@hwdsteel.com
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Add：Keda Xunfei Weilaigang Building, No. 1 Jiangshan South Road, Huangdao District, Qingdao City, Shandong Province
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◉ PRODUCT SPECIFICATION


1. Material Standards & Grades


Primary Standards:

  • ASTM A500 - Cold-Formed Welded and Seamless Carbon Steel Structural Tubing

  • ASTM A1085 - Cold-Formed Welded Carbon Steel Hollow Structural Sections

  • EN 10219 - Cold Formed Welded Structural Hollow Sections

  • JIS G3466 - Carbon Steel Square Pipes for General Structure

Common Material Grades:

Grade

Yield Strength (MPa)

Tensile Strength (MPa)

Equivalent Standards

Gr. A

≥ 230

310-430

S235JR

Gr. B

≥ 290

400-550

S275JR

Gr. C

≥ 330

460-580

S355JR

Gr. D

≥ 360

500-620

S355J2


2. Chemical Composition (% by weight)


Element

Gr. A

Gr. B

Gr. C

Gr. D

Carbon (C)

≤ 0.23

≤ 0.26

≤ 0.23

≤ 0.22

Manganese (Mn)

≤ 1.35

≤ 1.35

≤ 1.50

≤ 1.60

Phosphorus (P)

≤ 0.035

≤ 0.035

≤ 0.035

≤ 0.030

Sulfur (S)

≤ 0.035

≤ 0.035

≤ 0.035

≤ 0.030

Silicon (Si)

≤ 0.40

≤ 0.40

≤ 0.55

≤ 0.55

Carbon Equivalent

≤ 0.36

≤ 0.43

≤ 0.45

≤ 0.45


3. Mechanical Properties


Grade

Yield Strength (MPa)

Tensile Strength (MPa)

Elongation (%)

Hardness (HB)

Gr. A

≥ 230

310-430

≥ 25

≤ 180

Gr. B

≥ 290

400-550

≥ 23

≤ 200

Gr. C

≥ 330

460-580

≥ 21

≤ 220

Gr. D

≥ 360

500-620

≥ 20

≤ 230


4. Physical Properties


Property

Typical Value

Test Standard

Density

7.85 g/cm³

ASTM E1266

Modulus of Elasticity

200 GPa

ASTM E111

Poisson's Ratio

0.30

-

Thermal Expansion Coefficient

11.7 × 10⁻⁶/°C

ASTM E228

Thermal Conductivity

50.0 W/m·K

ASTM E1225


5. Product Specifications


Parameter

Standard Range

Tolerance

Available Customization

Outer Size

10×10mm - 500×500mm

±1.0mm

8×8mm - 600×600mm

Wall Thickness

0.8mm - 20mm

±10%

0.6mm - 25mm

Length

3m - 12m

+50mm/-0mm

1m - 18m

Straightness

≤ 1.5mm per meter

-

≤ 1.0mm per meter

Squareness

≤ 1.0° deviation

-

≤ 0.5° deviation


6. Manufacturing Process


Production Methods:

  • Cold forming and welding

  • Hot rolling process

  • Seamless extrusion (for smaller sizes)

  • Continuous welding process

Process Flow:
Coil Preparation → Forming → Welding → Sizing → Cutting
→ Heat Treatment → Surface Treatment → Inspection


7. Surface Treatment Options


Treatment Type

Thickness/Finish

Application Method

Standards

Hot-Dip Galvanizing

45-85μm

Hot-dip process

ASTM A123

Powder Coating

60-120μm

Electrostatic spray

ASTM D3451

Painting

25-50μm

Spray or brush

ASTM D2200

Black/Oiled

-

Mill finish

-


8. Testing & Inspection


Mandatory Tests:

  • Tensile test

  • Flattening test

  • Hardness test

  • Dimensional inspection

  • Visual inspection

  • Weld seam inspection

Optional Tests:

  • Charpy impact test

  • Bend test

  • Hydrostatic test

  • Ultrasonic testing

  • Positive Material Identification


9. Applications


Structural Applications:

  • Building frameworks and supports

  • Architectural structures

  • Machinery frames and guards

  • Material handling equipment

  • Furniture and display systems

Industrial Applications:

  • Conveyor systems

  • Storage rack systems

  • Agricultural equipment

  • Automotive frameworks

  • Construction scaffolding

All square steel pipes are manufactured according to international standards and can be customized to meet specific project requirements and application needs.

◉ Surfcae selection

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SURFACE CHARACTERISTIC SUMMARY OF MANUFACTURING METHOD APPLICATION
NO.1 Silvery white Hot rolled to specified thickness Do not need to have a glossy surface use
lackluster
NO.2D Silvery white After cold rolling, heat treatment and pickling are carried out General material, deep material
NO.2B Gloss is stronger than No.2D After No.2D treatment, the final light cold rolling is carried out through the polishing roller The general material
BA As bright as a sixpence No standard, but usually a bright annealed surface with high reflectivity. Building materials, kitchen utensils
NO.3 Rough lapping Grind with 100~200# (unit) strop tape Building materials, kitchen utensils
NO.4 Intermediate grinding Polished surface obtained by grinding with 150~180# strop abrasive tape Building materials, kitchen utensils
NO.240 Fine lapping Grinding with 240# strop abrasive tape kitchenware
NO.320 Very fine grinding Grinding was carried out with 320# strop abrasive tape kitchenware
NO.400 The luster is close to BA Use 400# polishing wheel to grind General timber, building timber, kitchen appliances
HL Hairline grinding Suitable particle material for hair stripe grinding (150~240#) with many grains Building, construction material
NO.7 It's close to mirror grinding Use a 600# rotary polishing wheel to grind For art or decoration
NO.8 Mirror ultrafinish The mirror is ground with a polishing wheel Reflector, for decoration

◉ PRODUCTION AND WAREHOUSING

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