What is a Φ90 Steel Pipe and Why Is It Called Φ90?

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A Φ90 steel pipe refers to a round steel pipe with an outer diameter of 90 millimeters. The symbol “Φ” (phi) is commonly used in engineering and manufacturing to represent the diameter of circular objects such as pipes, rods, and holes.

1. What is a Φ90 Steel Pipe?

A Φ90 steel pipe is a circular metal pipe whose outside diameter is exactly 90 mm.It can be made from different types of steel such as carbon steel, galvanized steel, or stainless steel, depending on the application.

Key characteristics:

Outer diameter: 90 mm
Shape: Round
Material: Steel (varies by type)
Applications: Construction, machinery, water systems, structural supports, and industrial piping

2. Why Is It Called “Φ90”?

The designation “Φ90” simply describes the outer diameter of the pipe.

“Φ” (phi) = diameter
“90” = 90 millimeters

Therefore, Φ90 = diameter 90 mm.

This naming system helps engineers, builders, and manufacturers easily identify and standardize pipe sizes.

3. Additional Notes

In many technical drawings, Φ is placed before the number to show the size refers to a diameter, not a length or thickness.
Other dimensions of the pipe—such as wall thickness (t) or inner diameter (ID)—must be specified separately (e.g., Φ90 × 4 mm).

4. Suppliers of Steel Pipes in Vietnam

Lộc Thiên Steel is a reputable distributor specializing in high-quality steel pipes in Vietnam. We are committed to supplying products for all customer needs—from small household projects to large-scale industrial constructions.

Benefits When Buying Steel Pipes from Lộc Thiên Steel

Certified products (CO–CQ) with clear origin
Free delivery in many regions
High discounts for bulk orders
Attractive commission for referral partners
Flexible payment options
Custom machining and cutting services, including Φ21 steel pipes according to customer specifications