Mild Steel Sheet - Raw Steel

Mild steel sheet, often referred to as raw steel or black mild steel, is one of the most versatile and widely used materials in fabrication and construction. At Metal Sheets Ltd, we primarily stock hot rolled (HR4) mild steel sheet, supplied directly from the steel mill in its original downstream form. Cost-effective, durable and easy to work with, hot rolled steel is a go-to material for fabrication shops, structural applications and industrial design features. Its characteristic dark mill scale finish gives raw steel its distinctive appearance, making it equally popular for functional engineering projects and contemporary interior design.

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Raw Steel - The Product

Metal Sheets Ltd supplies mild steel sheet to both trade and public customers, with a primary focus on HR4 hot rolled steel sheet, commonly referred to as raw steel or black mild steel.

Hot Rolled: The Basics

Hot rolled (HR) and cold rolled (CR) steel are the two primary forms of mild steel. Hot rolled steel is the initial downstream product produced directly from the steel mill, before any further processing such as cold rolling.

Hot rolled sheets typically retain a mill scale finish, which can appear black or blue in colour. This distinctive surface gives the material its alternative names — raw steel or black mild steel. Due to its stren

Hot Rolled Mild Steel

Raw Steel Applications

Please refer to the table for available stock sizes. Custom cutting and fabrication services are available on request.

Hot Rolled Steel (HR)
Hot rolled steel is widely used across construction, fabrication and design-led projects due to its durability and cost-effectiveness. Common applications include:

1. Construction: Used in structural components for buildings, bridges and infrastructure, including beams, columns and load-bearing elements.

2. Pipes and Tubes: Employed in the manufacture of pipes and tubes for oil and gas, water supply and construction industries.

3. Doors and Shelving: Frequently used for industrial doors, shelving units, storage racks and workshop fixtures.

4. Industrial Décor: The raw, industrial appearance of hot rolled steel is popular with interior designers for items such as table tops, wall cladding, feature panels and architectural details.

For further inspiration, visit our Flickr gallery, or explore Corten steel, a weathering steel variation of mild steel

Stock	Finish	Thickness (mm)	Sheet Size (mm)
Mild Steel	Black Hot Rolled (HR)	1.5, 2.0, 3.0	2000 x 1000, 2500 x 1250

Frequently Asked Questions – Mild Steel Sheet (Raw Steel)

What is hot rolled mild steel sheet?

Hot rolled steel sheet is the first-stage product produced directly from the steel mill. It is rolled at high temperatures, giving it its characteristic black mill scale finish. It is sometimes referred to as raw steel or black mild steel.

How does hot rolled steel differ from cold rolled steel?

Hot rolled steel has a less refined surface with mill scale present, while cold rolled steel (CR) is further processed to achieve a smoother, more uniform finish and tighter dimensional tolerances. HR steel is typically used for structural work and fabrication, while CR steel is chosen where appearance or precision is more important.

Does hot rolled steel need to be painted?

Yes. Hot rolled steel will rust if left unprotected, particularly outdoors. It should be primed and painted for long-term durability. For corrosion resistance without painting, galvanised steel or stainless steel is recommended.

Can mild steel be laser cut?

Yes. Mild steel is ideal for precision laser cutting and can be cut into detailed shapes or components, from small one-off parts to larger production runs.

Is mild steel suitable for indoor design features?

Yes. Hot rolled mild steel is commonly used in industrial-style interiors, including cladding, shelving, wall panels, tabletops and decorative features. The mill scale finish provides a distinctive raw, urban aesthetic.

Can mild steel sheet be welded and fabricated?

Absolutely. Mild steel is easy to weld, bend, fold and fabricate, making it one of the most versatile materials for general metalworking and fabrication.

Will the mill scale stay on the steel?

Mill scale is relatively stable but can flake, mark or rust over time. For painted finishes, the scale should be cleaned or removed prior to priming to ensure good paint adhesion.

What thicknesses are available for mild steel sheet?

We supply hot rolled mild steel sheets in thicknesses commonly used in fabrication, engineering and construction. Sheets are available as full sheets, part sheets or custom-cut panels.

Is raw mild steel suitable for outdoor use?

Raw steel can be used outdoors but will rust quickly if left untreated. For exterior applications requiring corrosion resistance, galvanised steel or Corten weathering steel is typically recommended.

Do you supply samples of mild steel?

Yes. Free mild steel samples are available to designers, architects and educational institutions. To request samples, email sales@metalsheets.co.uk.

Do you deliver mild steel sheets across the UK?

Yes. We offer reliable nationwide and international delivery of hot rolled steel sheets, custom-cut panels and fabricated components.