Name: Galvanized Steel Pipe Supplier | Hot-Dip, Electro, Custom Cut
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+86 18954208811

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info@hwdsteel.com

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Galvanized Steel Pipe Supplier | Hot-Dip, Electro, Custom Cut

As a professional galvanized steel pipe manufacturer, we produce both hot-dip galvanized and electro-galvanized pipes that offer superior corrosion resistance, excellent durability, and reliable performance. Our products undergo strict quality control to ensure consistent quality for various industrial and construction applications.

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 A53, ASTM A123, BS 1387, EN 10240
Electro-Galvanized: ASTM A53, ASTM A153, JIS G3442
Structural Pipes: ASTM A500, ASTM A501

Process Comparison:

Parameter	Hot-Dip Galvanized	Electro-Galvanized
Coating Thickness	45-85μm	5-25μm
Coating Appearance	Spangled, thicker	Smooth, uniform
Corrosion Resistance	Excellent (20-50 years)	Good (5-15 years)
Cost Effectiveness	Medium	High
Application	Outdoor, harsh environments	Indoor, mild environments

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

Element	ASTM A53 Gr. A	ASTM A53 Gr. B	ASTM A500 Gr. B	JIS G3442 STK400
Carbon (C)	≤ 0.25	≤ 0.30	≤ 0.26	≤ 0.25
Manganese (Mn)	≤ 0.95	≤ 1.20	≤ 1.35	≤ 1.20
Phosphorus (P)	≤ 0.05	≤ 0.05	≤ 0.035	≤ 0.040
Sulfur (S)	≤ 0.045	≤ 0.045	≤ 0.035	≤ 0.040
Copper (Cu)	≥ 0.20	≥ 0.20	≥ 0.20	-

3. Mechanical Properties

Grade	Yield Strength (MPa)	Tensile Strength (MPa)	Elongation (%)	Hardness (HB)
A53 Gr. A	≥ 205	≥ 330	≥ 25	≤ 139
A53 Gr. B	≥ 240	≥ 415	≥ 23	≤ 149
A500 Gr. B	≥ 290	≥ 400	≥ 20	≤ 163
STK400	≥ 235	≥ 400	≥ 25	≤ 143

4. Coating Specifications

Hot-Dip Galvanized Coating:

Coating Class	Coating Thickness (μm)	Coating Mass (g/m²)	Average 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)
Light Coating	5-10	35-70
Medium Coating	10-15	70-105
Heavy Coating	15-25	105-175

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
Zinc Melting Point	419°C	-

6. Product Specifications

Parameter	Hot-Dip Galvanized Range	Electro-Galvanized Range	Tolerance
Outer Diameter	1/2" - 24" (21.3-610mm)	1/8" - 8" (10.3-219mm)	±1%
Wall Thickness	1.0-25.0mm	0.8-12.0mm	±12.5%
Length	3-12m	3-12m	+10mm/-0mm
Straightness	≤ 1.5mm/m	≤ 1.0mm/m	-
Thread Type	NPT, BSP, API	NPT, BSP	-

7. Testing & Quality Control

Mandatory Tests:

Hydrostatic test (ASTM A53)
Flattening test (ASTM A53)
Reverse flattening test
Coating thickness test (ASTM E376)
Zinc coating adherence test
Visual inspection
Dimensional inspection

Optional Tests:

Salt spray test (ASTM B117)
Bend test
Chemical analysis
Mechanical properties test
Third-party inspection

8. Applications

Hot-Dip Galvanized Applications:

Construction: Structural frameworks, scaffolding
Infrastructure: Water pipelines, gas transmission
Industrial: Fencing, handrails, guard rails
Agricultural: Irrigation systems, greenhouse structures
Telecommunication: Tower structures, cable conduits

Electro-Galvanized Applications:

Electrical: Conduit pipes, cable management
Automotive: Fuel lines, brake pipes
Furniture: Display racks, furniture frames
Mechanical: Hydraulic lines, pneumatic systems
Decorative: Indoor decorative structures

9. Special Features & Advantages

Hot-Dip Galvanized Advantages:

Complete corrosion protection (inside and outside)
Long service life (20-50 years)
Excellent abrasion resistance
Cathodic protection for damaged areas
Low maintenance cost

Electro-Galvanized Advantages:

Smooth, uniform coating surface
Precise coating thickness control
Good paint adhesion
Cost-effective for indoor applications
Bright, attractive appearance

◉ Surfcae selection

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
NO.1	lackluster	Hot rolled to specified thickness	Do not need to have a glossy surface use
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

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