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  • Galvanized Square Tube Manufacturer | Hot-Dip & Electro Galvanized Steel Pipes

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Galvanized Square Tube Manufacturer | Hot-Dip & Electro Galvanized Steel Pipes
As a professional galvanized square tube manufacturer, we produce both hot-dip galvanized and electro-galvanized square steel tubes that offer excellent corrosion resistance, superior structural strength, and aesthetic appeal. Our products are widely used in construction, furniture, and industrial applications due to their durability and versatility.
Phone：+86 18954208811
Email：info@hwdsteel.com
WhatsApp：+86 18954208811
Add：Keda Xunfei Weilaigang Building, No. 1 Jiangshan South Road, Huangdao District, Qingdao City, Shandong Province
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◉ PRODUCT SPECIFICATION


1. Manufacturing Processes & Standards


Primary Standards:

  • Hot-Dip Galvanized: ASTM A500, ASTM A53, EN 10219, GB/T 3091

  • Electro-Galvanized: ASTM A513, JIS G3466, GB/T 6728


Process Comparison:

Parameter

Hot-Dip Galvanized

Electro-Galvanized

Coating Thickness

45-85μm

5-25μm

Coating Appearance

Uniform spangle

Smooth, bright

Corrosion Life

20-50 years

5-15 years

Coating Adhesion

Excellent

Very Good

Cost Effectiveness

Medium

High


2. Chemical Composition (% by weight, Base Steel)


Element

ASTM A500 Gr. B

ASTM A500 Gr. C

JIS G3466 STKR400

GB/T 6728 Q235

Carbon (C)

≤ 0.26

≤ 0.23

≤ 0.25

≤ 0.20

Manganese (Mn)

≤ 1.35

≤ 1.35

≤ 1.20

≤ 0.50

Phosphorus (P)

≤ 0.035

≤ 0.035

≤ 0.040

≤ 0.045

Sulfur (S)

≤ 0.035

≤ 0.035

≤ 0.040

≤ 0.045

Copper (Cu)

≥ 0.20

≥ 0.20

-

-


3. Mechanical Properties


Grade

Yield Strength (MPa)

Tensile Strength (MPa)

Elongation (%)

Hardness (HRB)

A500 Gr. B

≥ 290

≥ 400

≥ 20

≤ 84

A500 Gr. C

≥ 345

≥ 450

≥ 18

≤ 89

STKR400

≥ 235

≥ 400

≥ 25

≤ 80

Q235

≥ 235

375-500

≥ 22

≤ 78


4. Coating Specifications


Hot-Dip Galvanized Coating:

Coating Class

Coating Thickness (μm)

Coating Mass (g/m²)

Zinc Weight (oz/ft²)

Class 100

≥ 45

≥ 320

≥ 1.05

Class 150

≥ 55

≥ 390

≥ 1.28

Class 200

≥ 65

≥ 460

≥ 1.51

Class 250

≥ 75

≥ 530

≥ 1.74

Class 300

≥ 85

≥ 600

≥ 1.97


Electro-Galvanized Coating:

Coating Class

Coating Thickness (μm)

Coating Mass (g/m²)

Surface Finish

Light Coating

5-10

35-70

Bright

Medium Coating

10-15

70-105

Semi-bright

Heavy Coating

15-25

105-175

Matte


5. Physical Properties


Property

Typical Value

Test Standard

Density

7.85 g/cm³

ASTM E1266

Modulus of Elasticity

200 GPa

ASTM E111

Thermal Expansion Coefficient

11.7 × 10⁻⁶/°C

ASTM E228

Thermal Conductivity

50 W/m·K

ASTM E1225

Surface Roughness

Ra 0.8-3.2μm

ISO 4287


6. Product Specifications


Parameter

Standard Range

Tolerance

Available Customization

Outer Size

10×10mm - 400×400mm

±0.5-1.5mm

8×8mm - 500×500mm

Wall Thickness

0.8-12.0mm

±10%

0.6-16.0mm

Length

3-12m

+10mm/-0mm

1-18m

Straightness

≤ 1.5mm/m

-

≤ 1.0mm/m

Squareness

≤ 1.0°

-

≤ 0.5°


7. Manufacturing Process


Hot-Dip Galvanized Process:

  • Tube forming and welding

  • Chemical cleaning and pickling

  • Flux dipping

  • Hot-dip galvanizing (445-465°C)

  • Cooling and inspection


Electro-Galvanized Process:

  • Tube forming and welding

  • Electro-cleaning and activation

  • Electro-galvanizing

  • Passivation treatment

  • Drying and inspection


8. Testing & Quality Control


Mandatory Tests:

  • Tensile test (ASTM A370)

  • Flattening test (ASTM A500)

  • Bend test

  • Coating thickness test (ASTM E376)

  • Visual inspection

  • Dimensional inspection

  • Zinc coating uniformity test


Optional Tests:

  • Salt spray test (ASTM B117)

  • Adhesion test

  • Hardness test

  • Chemical analysis

  • Third-party inspection


9. Applications


Construction Applications:

  • Structural frameworks and supports

  • Building frames and trusses

  • Handrails and guardrails

  • Scaffolding systems

  • Roofing structures


Industrial Applications:

  • Machinery frames and guards

  • Conveyor systems

  • Storage racks and shelves

  • Agricultural equipment

  • Furniture manufacturing


Special Applications:

  • Solar panel mounting systems

  • Greenhouse structures

  • Exhibition displays

  • Decorative architectures

  • Fencing systems

◉ Surfcae selection

1750928966796787595606433792 拷贝
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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