Selecting the right steel pipes supplier: What do you have to look for?

Choosing the right steel pipe wholesaler is the first and most important decision in ensuring your projects meet quality, schedule, and budget expectations.

Which supplier attributes should you prioritise when making that choice?

• The importance of a dedicated team with extensive expertise in the mechanical properties and applications cannot be overstated, as their knowledge ensures customers receive the best technical support and guidance.
• Commitment to excellence, to ensure you get the best products and service at all times.
• To get the exact materials you need for a bespoke design, you need a supplier with comprehensive stock, offering various sizes, finishes, and grades for different construction and industrial applications.
• Hold an adequate stock of mild steel, stainless steel and galvanised pipes, to provide comprehensive solutions for pipe systems, including flexible and rigid options for transporting various media in construction and industrial settings and standard lengths, usually 1.5 m, 3 m, and 6 m.
• For peace of mind, your wholesaler should provide mill certificates to ensure traceability and mandatory certification to prove the highest safety and quality standards, such as:
  • Mill Test Certificates (MTCs) detail the chemical composition, mechanical properties, and dimensions of the pipes and mark each pipe with heat numbers and manufacturer logos for traceability.
  • Examples of technical certifications
    • EN 10219, ISO 9001, ASME, and DIN.
    • International standards such as API 5L, ASME, ASTM, and ISO 9001:2015, certifying chemical composition and mechanical performance.
    • Quality assurance test results, validation certificates, and third-party inspection reports.
    • EN 10204 defines the type of inspection certificates required for each type of steel.
    • EN 10255 specifies requirements for welded and seamless non-alloy steel tubes and pipes, typically used for water, gas, and air piping.
• Have the capabilities to expedite delivery times.
• Reliability and accuracy of materials to avoid delays on site.
• Be able to supply the necessary fittings and connectors.
• Offer value-added services like custom cutting to minimise on-site labour.
• A professional, detailed website with a verifiable physical address and official company contact channels is a primary indicator of a legitimate supplier.

You can trust Special Metal Alloys to exceed all these expectations.

Special Metal Alloys, located in the UK, is a reputable wholesaler and steel pipe supplier from esteemed international mills. We serve clients across Europe, offering extensive stock availability and leveraging our experience in the European market to meet diverse development needs.

We provide comprehensive, customised solutions and act as your strategic partner in the success of your venture.

Our extensive inventory serves a wide range of industries and contractors, including high-pressure petrochemical facilities, offshore energy plants, and outdoor structures. Specialist machining services and high-precision laser cutting are also available to meet specific job requirements.

Would you like to speak with a technical advisor about your project’s specific requirements and wholesale options? Let us help turn your vision into reality.

Contact us for a quote online, call +44 (0)161 278 2386 or email sales@specialmetalalloys.co.uk.

Please read on for more information about steel pipes and what the different types are used for.

Who needs wholesale quantities of steel pipes?

The durability, rust resistance, and strength make them essential for:

• Transporting oil, natural gas, and water across long distances.
• Construction for structural support, building foundations, building frames, and scaffolding.
• Industrial machinery, irrigation systems, automotive components, and public infrastructure developments.

The difference between pipes and tubes

Although the terms are frequently used interchangeably, pipes are typically round, making them ideal for transporting fluids or gases. Pipes are measured by the internal diameter, also known as nominal bore. Due to their strength, various types of pipes are well-suited for structural support and foundation posts.

Tubes or hollow sections can come in nearly any shape or profile, including round, square, and rectangular hollow sections. Steel tubes are measured by their outside diameter, making it easier to select sizes compatible with other materials, fixings, and connectors.

How are steel pipes manufactured?

Depending on the intended application, different manufacturing methods are used, which affect dimensional tolerances, load performance, and cost.

Seamless pipes

Seamless steel pipes are manufactured by heating solid round steel billets to temperatures of 1,200–1,300°C, piercing them to create a hollow shell, and then rolling and stretching them to achieve specific diameters and wall thicknesses. This process is called hot rolling and is used for larger sizes.

For greater precision and a smoother finish, some are then cold-drawn through a die, over a mandrel.

The advantages of seamless steel pipes include their uniform strength and high-pressure capability, making them ideal for demanding applications. They offer reliable performance and long-term durability in various systems.

Welded pipes

Welded pipes are manufactured by forming flat steel sheets or coils into a cylindrical shape using rollers, then welding the seam using methods like Electric Resistance Welding (ERW) or Submerged Arc Welding (SAW). The process involves uncoiling, forming, welding, sizing, and cutting, often followed by heat treatment and quality assurance testing.

Welded steel pipes are most commonly made by hot rolling, sometimes by rolling coils into a tube shape and welding the seam. This high-temperature process makes the steel malleable, enabling large deformations and producing durable, seamless pipes for industrial applications.

When welded pipes require smooth, precise tolerances, they are also cold-drawn.

Welded pipes are designed to withstand demanding conditions, delivering durability and reliability across a wide range of applications. The installation process for certain welded or flexible pipes can be straightforward, allowing for efficient assembly even in complex configurations. Additionally, installing flexible pipes in long lengths as a single piece can significantly reduce the number of connection points.

Electric Resistance Welding

ERW (Electric Resistance Welded) pipes are produced by cold-forming a flat steel strip into a cylindrical shape and welding the longitudinal seam using high-frequency electric current without filler material. The process involves uncoiling, edge trimming, forming into a cylinder, welding, removing excess weld, sizing, and cutting.

To ensure reliable performance in industrial, heating, and cryogenic applications, regular maintenance is essential to maintain the integrity and safety of ERW pipes.

Submerged Arc Welding

SAW is a high-speed automated or mechanised continuous welding process. Consumable welding electrodes are fed into a weld pool, which is protected by fusible flux.

It is called submerged arc welding because the arc is completely submerged under the flux, preventing visible light, spatter, and fumes.

Types of steel pipes

The most common materials are mild steel, galvanised steel, and stainless steel.

Mild steel

Mild steel tubes and pipes are available in different steel grades for various applications.

Stainless steel pipes

Stainless steel products are known for their exceptional corrosion resistance and durability. They are available in various grades to meet specific application requirements and industry standards. That makes them very popular for products such as pipes and fittings across various industrial applications and projects.

Galvanised pipes

To prevent steel pipes from rusting and corroding, a protective zinc coating is applied. The most common method is to submerge the pipes in molten zinc, creating a durable, metallurgical bond.

What are the Benefits of Galvanisation?

Corrosion resistance

In harsh industrial settings, outdoor environments, and areas where metal is exposed to rain, moisture, high humidity, corrosive elements, and temperature fluctuations, galvanised tubes and pipes provide exceptional corrosion resistance.

Through innovation and continuous improvement, galvanisation delivers a sustainable, environmentally friendly product that provides reliable performance for decades.

Low Maintenance

The zinc coating acts as a barrier, protecting the steel and helping it remain rust-free for many years, significantly reducing the need for ongoing maintenance, repainting, or costly repairs.

Industry quality and safety Standards

Galvanised pipes are manufactured to meet strict industry standards, guaranteeing performance in even the most challenging environments and maintaining their structural integrity under high pressure and temperatures, thereby reducing the risk of leaks or failures. This ensures that fittings, valves, and flanges are reliable and compatible, offering a complete solution.

A Complete Solution for Every Industry

Because of their corrosion-resistant properties and low maintenance requirements, they are widely used in hot and cold water systems, gas transportation, and structural support.

With a focus on delivering an extensive range of products, including all necessary fittings and accessories, galvanised steel pipes offer a complete, versatile solution for the long term.

When should I use flexible piping?

The choice between a rigid and a flexible pipe system is determined by factors such as the intended use and the transported medium.

Flexible pipe systems can be bent to a specified degree, enabling tight routing angles without additional components or connections, simplifying installation. 

Flexible heating pipes are often less prone to corrosion and more resilient when temperature and moisture fluctuate significantly. 

What are the different types of steel pipe used for?

Selecting the right pipes for your project depends on the properties most suitable for your application. Choosing correctly reduces costs and maintenance, and enhances safety and durability.

High-quality stainless steel pipes, connections, and fittings are essential for various industrial applications, ensuring safety and environmental protection.

Buying from reliable sources reduces the risk of leaks, corrosion, and structural failure, minimising unscheduled downtime and maintenance costs. While initial prices may be higher, the durability and reduced need for frequent replacements lead to a lower Total Cost of Ownership (TCO).

While different steel pipes share certain characteristics, some excel in specific qualities such as corrosion resistance, yield, tensile and compression strength, and impact toughness.

When evaluating the information below, consider specific conditions such as coastal locations, high rainfall zones, wind uplift and strength, and corrosive environments. In these cases, opting for stainless steel pipes, typically grade 316, or even specialised nickel alloys may be better. Pipe systems designed for industrial processes are uncompromisingly reliable for conveying potentially hazardous media.

For most areas where corrosion is a minor concern, Grade 304 stainless steel or galvanised steel pipes should be adequate.

Here are some of the most common applications for steel pipes, along with the most cost-effective choice where corrosion risk is low:

Structural columns

• Hollow structure sections of different wall thickness, dimensions, and lengths are usually the most suitable because of their high load-bearing capacity.
• They are cold-formed welded steel tubes manufactured to ASTM A500 Grade C, offering a superior strength-to-weight ratio.

Frame members

• Square pipes, or rectangular hollow structural sections, offer superior strength, corrosion resistance, and structural stability because they do not easily warp or twist easily.
• They are perfectly suited for outdoor buildings, including garden rooms and garden offices.
• They are available in different wall thicknesses, dimensions, and lengths.
• They are easy to weld and shaped for load-bearing frames, corners, and clean lines. straightforward to add cladding, windows, and doors.
• Rectangular hollow sections generally offer higher bending stiffness for lightweight frames.
• For outdoor or areas with corrosion risk:
  • Most types of galvanised steel meet the EN standards for coating and corrosion resistance.
  • Zinc coating (also called hot-dip galvanising) offers surface protection against the weather.
  • The coating thickness depends on exposure and expected service life.
  • Powder coating or paint slows down corrosion and improves the aesthetic appearance of pipes.
  • Steel pipes, including galvanised or zinc-coated pipes, can be painted, provided the necessary surface preparation is completed.
• Fittings and connectors should be compatible with the steel, any cladding, and fixtures. If not, electrochemical reactions could lead to corrosion and damage.

Lower-cost building frames and bracing

• Mild steel tubes are popular for projects in sheltered areas and industrial settings because of their mechanical and strength properties.
• In outdoor applications where rust is a concern, mild steel with a galvanised finish or special coating is a better choice.

Support posts

• Schedules 80 or 160 have thicker walls for heavy vertical or horizontal loads.
• Their high yield strength makes ASTM A252 ideal for deep piles and foundation work.
• Both can absorb great impact, without buckling or twisting.
• Their round shape is the most efficient for evenly distributing pressure.

Handrails and balustrades

• Favoured for their clean and modern appearance, stainless steel pipes and tubes are often used for handrails and balustrades.
  • For external use, especially in coastal areas, grade 316 stainless steel offers the best durability and corrosion resistance.
  • For indoor use, grade 304 stainless steel is a popular choice.
• Galvanised steel is also a popular choice for outdoor use and in industrial-style applications.

Low-pressure utility pipes

• Galvanised carbon steel pipes are popular for transporting compressed air or non-potable water at low pressure.
• The galvanised pipe, historically used for domestic water supply, is susceptible to internal corrosion and scaling over time.
• Copper or PEX tubing is often used in domestic plumbing, but it must meet the certification requirements of UK water regulations.
• Corrosion-protected steel is often used for external plumbing, especially where there is the risk of mechanical damage.
• ASTM A53 Grade B welded pipe is the industry standard for transporting low-pressure liquids and drinking water.

Transportation of liquids and gases

Because of their ability to withstand extreme pressure and corrosion, galvanised pipes are ideally suited for a wide range of demanding applications, including the transportation of hot and cold water, gas, and oil.

Automotive manufacturing

They are commonly used in exhaust systems, structural components, fluid pipes, and body parts.

The zinc coating protects parts from rust, extending the vehicle’s life and enabling the use of thinner, lighter materials.

Appliances

Mild steel pipes are commonly used in appliance manufacturing and as protective coverings for utility pipes.

Request an online quote now for your custom design and budget. You can also call us on +44 (0)161 278 2386 or email sales@specialmetalalloys.co.uk.