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Galvanized Steel Pipe：Size，Type and Price–Royal Group

Galvanized steel pipe is a welded steel pipe with a hot-dip or electroplated zinc coating. Galvanizing increases the steel pipe's corrosion resistance and extends its service life. Galvanized pipe has a wide range of uses. Besides being used as line pipe for low-pressure fluids like water, gas, and oil, it is also used in the petroleum industry, particularly for oil well pipes and pipelines in offshore oil fields; for oil heaters, condenser coolers, and coal distillation and washing oil exchangers in chemical coking equipment; and for pier piles and support frames in mine tunnels.

galvanized steel pipe

What are the sizes of galvanized steel pipes?

Nominal Diameter (DN) Corresponding NPS (Inch) Outer Diameter (OD) (mm) Common Wall Thickness (SCH40) (mm) Inner Diameter (ID) (SCH40) (mm)
DN15 1/2" 21.3 2.77 15.76
DN20 3/4" 26.9 2.91 21.08
DN25 1" 33.7 3.38 27
DN32 1 1/4" 42.4 3.56 35.28
DN40 1 1/2" 48.3 3.68 40.94
DN50 2" 60.3 3.81 52.68
DN65 2 1/2" 76.1 4.05 68
DN80 3" 88.9 4.27 80.36
DN100 4" 114.3 4.55 105.2
DN125 5" 141.3 4.85 131.6
DN150 6" 168.3 5.16 157.98
DN200 8" 219.1 6.02 207.06
hot dipped galvanized steel pipe03
Electrogalvanized steel pipe

What are the types of galvanized steel pipes?

 

Type Process Principle Key Features Service Life Application Scenarios
Hot Dip Galvanized Steel Pipe Immerse the steel pipe in molten zinc liquid (about 440-460℃); a double-layer protective coating ("zinc-iron alloy layer + pure zinc layer") forms on the pipe surface through chemical reaction between the pipe and zinc. 1. Thick zinc layer (usually 50-100μm), strong adhesion, not easy to peel off;
2. Excellent corrosion resistance, resistant to acid, alkali and harsh outdoor environments;
3. Higher process cost, silver-gray appearance with a slightly rough texture.		 15-30 years Outdoor projects (e.g., street lamp poles, guardrails), municipal water supply/drainage, fire-fighting pipelines, industrial high-pressure pipelines, gas pipelines.
Electro Galvanized Steel Pipe  Zinc ions are deposited on the steel pipe surface through electrolysis to form a pure zinc coating (no alloy layer). 1. Thin zinc layer (usually 5-20μm), weak adhesion, easy to wear and peel off;
2. Poor corrosion resistance, only suitable for dry, non-corrosive indoor environments;
3. Low process cost, bright and smooth appearance.		 2-5 years Indoor low-pressure pipelines (e.g., temporary water supply, temporary decoration pipelines), furniture brackets (non-load-bearing), indoor decorative parts.

What are the pricess of galvanized steel pipes?

The price of galvanized steel pipe is not fixed and fluctuates significantly due to various factors, so it's impossible to provide a uniform price.

When purchasing, it's recommended to inquire based on your specific requirements (such as diameter, wall thickness (e.g., SCH40/SCH80), and order quantity—bulk orders of 100 meters or more typically receive a 5%-10% discount) to obtain accurate and up-to-date pricing.

ROYAL GROUP

Address

Kangsheng development industry zone,
Wuqing district, Tianjin city, China.

E-mail

sales01@royalsteelgroup.com
chinaroyalsteel@163.com(Factory Contact)

Phone

Sales Manager: +86 153 2001 6383‬

Hours

Monday-Sunday: 24-hour Service

Post time: Sep-16-2025