Available size range of boiler & petrochemical seamless steel pipes

Selecting the correct outside diameter (OD) and wall thickness (WT) is one of the most important considerations when specifying seamless steel pipes for boiler, heat exchanger, pressure vessel, petrochemical, and power generation applications. Different manufacturing processes support different dimensional ranges, and understanding these capabilities helps engineers optimize both performance and cost.

At Union Steel Industry, we supply seamless steel tubes in a wide variety of dimensions through both cold drawn/cold rolled and hot rolled manufacturing processes. Our production range is designed to meet international standards while accommodating customized project requirements.

Cold Drawn & Cold Rolled Seamless Tube Size Range

Cold drawn and cold rolled seamless tubes are manufactured through secondary processing after hot rolling. These tubes provide:

Higher dimensional accuracy

Better surface finish

Tighter wall thickness tolerance

Improved concentricity

Excellent suitability for precision applications

Typical applications include:

Heat exchanger tubes

Instrumentation tubing

Precision mechanical tubing

Hydraulic systems

High-pressure boiler tubes

According to our production capability, the cold finished size range covers:

Outside Diameter (OD): 18–89 mm

Wall Thickness (WT): 2.5–16.0 mm

Some combinations shown in the chart may require technical evaluation depending on the OD-to-wall ratio.

Hot Rolled Seamless Tube Size Range (Ø31.8–180 mm)

Hot rolled seamless pipes are ideal for medium-size industrial applications where higher production efficiency and larger wall thicknesses are required.

Typical characteristics include:

High productivity

Excellent mechanical properties

Cost-effective manufacturing

Suitable for pressure service

Wide material availability

Production range:

Outside Diameter (OD): 31.8–180 mm

Wall Thickness (WT): 3.2–30.0 mm

This range is widely used for:

Boiler tubes

Petrochemical piping

Superheater tubes

Reheater tubes

Main steam pipelines

Structural applications

Large Diameter Hot Rolled Seamless Pipe Size Range (Ø200–457 mm)

For heavy industrial projects, larger diameter seamless pipes are produced using hot rolling technology.

Available production range:

Outside Diameter (OD): 200–457 mm

Wall Thickness (WT): 6–60 mm

Large diameter seamless pipes are commonly used in:

Petrochemical plants

Oil & gas transportation

Refinery piping

High-pressure pipelines

Power station construction

Pressure vessels

Size Availability Guide

The size charts use different color indicators to represent manufacturing availability.

If a required dimension is not included in the standard matrix, Union Steel Industry can evaluate customized manufacturing solutions based on project requirements.

Choosing Between Cold Drawn and Hot Rolled Tubes

Why Dimension Selection Matters

Selecting the proper tube dimensions directly affects:

Pressure-bearing capacity

Mechanical strength

Heat transfer efficiency

Welding performance

Corrosion allowance

Service life

Manufacturing cost

Engineers typically choose the optimal OD and wall thickness based on operating pressure, design temperature, process medium, applicable standards, and installation requirements.

Why Choose Union Steel Industry?

Union Steel Industry provides seamless steel pipes for boiler, petrochemical, power generation, and industrial applications with comprehensive manufacturing capabilities.

Our advantages include:

Wide OD range from 18 mm to 457 mm

Wall thickness up to 60 mm

Cold drawn and hot rolled production

Multiple international standards available

Customized dimensions upon technical evaluation

Strict quality inspection and dimensional control

Whether you require precision cold drawn tubes or heavy-wall hot rolled seamless pipes, our engineering team can recommend the most suitable dimensions for your application.

FAQ

1. What is the smallest seamless tube size available?

Cold drawn seamless tubes are available starting from 18 mm OD.

2. What is the largest seamless pipe size available?

Hot rolled seamless pipes can be supplied up to 457 mm OD.

3. Can non-standard sizes be manufactured?

Yes. Customized dimensions can be produced after technical evaluation.

4. Which process offers better dimensional accuracy?

Cold drawn and cold rolled tubes provide higher dimensional precision than hot rolled tubes.

5. Are these sizes suitable for boiler and petrochemical applications?

Yes. These dimensional ranges are widely used for boilers, heat exchangers, petrochemical plants, power stations, and pressure piping systems.