Steel Pipe & Round Tube — strong, versatile, ready for fabrication

When you need a tough, dependable round section, steel pipe (and round tube) is a go-to for everything from general fabrication to structural bracing and outdoor builds. Steelmart stocks a solid range of black pipe, galvanised pipe, Galvabond round tube, semi-bright round tube, and stainless steel tube so you can match the finish and corrosion resistance to the job.

Typical uses include:

  • posts, braces and frames
  • handrails and balustrade components
  • farm and acreage fabrication (gates, rails, general repairs)
  • trailer and workshop fabrication
  • outdoor supports and structures (where corrosion resistance matters)

Choose the right pipe for the job

Black Pipe (mild steel)

Black pipe is a practical, weld-friendly option for general fabrication and structural support where the steel will be painted, coated, or used indoors/under cover. Steelmart’s black pipe is supplied in 6.5m lengths with a wide NB size range.

Common applications:

  • frames and bracing
  • posts and supports
  • fabricated rails and brackets
  • workshop builds and repairs

Galvanised Pipe (corrosion resistant)

Galvanised pipe is zinc-coated for added corrosion protection, a smart pick for outdoor work, fencing, and exposed builds where uncoated mild steel will rust quickly.

Good for:

  • outdoor structures and supports
  • rural and coastal-adjacent projects (depending on exposure)
  • fencing rails and general external fabrication

Galvabond Round Tube (coated tube for durability)

Galvabond round tube is coated for strong corrosion resistance and durability, making it well suited to residential and light industrial fabrication where you want a cleaner finish than raw mild steel.

Ideal for:

  • light frames and supports
  • outdoor and semi-exposed fabrication
  • general fabrication where appearance matters

Semi-Bright Round Tube (cleaner finish, great for powder coat)

Semi-bright round tube is designed for jobs that need a smooth, consistent finish without being mirror-polished; popular for decorative + structural projects and anything being powder coated.

Common uses:

  • fabricated furniture and fit-outs
  • feature frames and architectural details
  • projects needing a tidy finish

Stainless Steel Tube — durable, hygienic, and high corrosion resistance

Stainless steel is the premium choice when you need a clean finish and strong corrosion resistance. Steelmart stocks Grade 304 and Grade 316 stainless tube, with pricing per metre and finish options including 320 grit (and 600 grit on selected variants).

Best suited to:

  • coastal/exposed environments (316 is commonly preferred in marine-style exposure)
  • handrails, balustrades and architectural fabrication
  • food-area fabrication and clean, presentation-focused projects (where specified)

Note: Stainless is highly corrosion resistant, but it’s not “rust-proof” in every environment — correct grade selection and proper fabrication/clean-up matters

FAQ's

What is a steel pipe used for?

Steel pipe and round tube are commonly used for fabrication and structural jobs like:

  • handrails and posts
  • frames, bracing and supports
  • rural and farm fabrication (gates, rails, general repairs)
  • fencing components and external structures (when the right finish is chosen)

For plumbing water and gas services, always confirm the required compliant material and standard for the specific application.

Is stainless steel good for pipes?

Yes, stainless steel pipe/tube is a strong choice when you need high corrosion resistance and a clean finish. It’s widely used for handrails, balustrades, coastal builds, and hygienic environments (when specified).

Just note: stainless is highly corrosion resistant, but not “never rusts” in every environment — grade selection (often 304 vs 316) and correct fabrication/clean-up matter.

What are the three types of steel pipe?

A simple way to group common options is:

  • Black (mild steel) pipe – uncoated, weld-friendly for general fabrication
  • Galvanised pipe – zinc-coated for improved corrosion resistance outdoors
  • Stainless steel pipe/tube – best corrosion resistance and a clean finish

(There are also different manufacturing types like welded vs seamless, but the finish/grade is usually what customers are choosing day-to-day.)

Can I use galvanised pipe for drinking water?

In general, steel pipe (including galvanised and black steel) is not used for drinking water services under Australian plumbing requirements, and products in contact with drinking water need to comply with the relevant standards (including testing for contact with drinking water).

For potable water, plumbers typically specify compliant alternatives (based on the application and local requirements).

What is the difference between a pipe and a tube?

In most trade contexts:

  • Pipe is commonly specified by nominal size (e.g., NB/DN) and wall thickness/schedule, because it’s designed around flow capacity and fittings.

  • Tube is commonly specified by outside diameter (OD) and wall thickness, because it’s designed around structural and fabrication sizing and tighter dimensional control