Table of content
Introduction
Those who work in the pipe and steel pipe manufacturing industry need to understand the differences between various steel pipes. This article mainly introduces the differences between black pipes and galvanized steel pipes. The two are different in production process, material and use environment. Understanding the difference between the two will help you make a specific choice.
The main difference between black pipes and galvanized pipes is that black pipes are mostly used in gas and heating systems. Galvanized pipes are mostly used in anti-corrosion pipe systems.
What Is Black Pipe?
Black pipes are usually made of steel or iron without coating. A layer of iron oxide is formed during the manufacturing process, so they are usually black. They are heat-resistant and durable.
Key features
- No protective coating
- Durable
- High temperature resistant
- Can be made into threaded connections
Common uses
- Industrial piping systems
- Natural gas and propane pipes
- Steam and high temperature piping systems
- Building structure support
What Is Galvanized Pipe?
Galvanized pipes are mostly made of steel or iron like black pipes, while galvanized pipes are mostly coated on the surface. The galvanized coating helps prevent rust and corrosion, especially in water or humid environments.
Key features
- Galvanized coating on the surface has anti-corrosion effect
- Stronger anti-corrosion effect than black pipe
- Higher price than black pipe
Common uses
- Water supply pipe system
- Outdoor pipe
- Irrigation system
- Fence and scaffolding
Key Differences Between Black and Galvanized Pipe
| Feature | Black Pipe | Galvanized Pipe |
|---|---|---|
| Surface finish | Uncoated, dark matte | Silver or grey zinc coating |
| Corrosion resistance | Low (not rust-resistant) | High (due to zinc layer) |
| Main application | Gas and steam | Water and outdoor plumbing |
| Cost | Lower | Slightly higher |
| Compatibility | Safe for gas systems | Not recommended for gas lines |
| Weight | Lighter | Heavier due to zinc |
Why You Shouldn’t Use Galvanized Pipe for Gas
Galvanized pipes may cause the galvanized layer to fall off after being used for too long, which may cause gas pipes to be blocked (burners, gas regulators, valves). It will cause safety hazards.
How to Tell the Difference
Here’s how to quickly identify each:
- Color: Black pipes are mostly black or dark gray. Galvanized pipes are mostly bright silver.
- Surface: The surface of black pipes is slightly rough. The surface of galvanized pipes is smoother.
- Weight: Galvanized pipes are slightly heavier than black pipes.
- Labels: Specifications are printed on the surface of steel pipes.
Which One Should You Use?
Choose black pipe if:
- Gas piping system
- Industrial piping system
Choose galvanized pipe if:
- Pipeline system in corrosive environment
- Water treatment piping system
- Fence or scaffolding
Summary
Although both black pipe and galvanized pipe are made of steel, galvanized pipe has a zinc coating on the surface, which has a corrosion resistance effect. Black pipe is mostly used in industrial piping system and gas piping system. Galvanized pipe is mostly used in water treatment system.
