Leading Suppliers Nationally for Steel Alloys, Sulphur Copper, Section

Here is a list of leading national suppliers in the United Kingdom in the specified categories:

Steel Alloys:

1. Tata Steel
2. ArcelorMittal
3. Liberty Steel
4. Severstal
5. SSAB

Sulphur Copper:

1. BHP Billiton
2. Glencore
3. Freeport-McMoRan
4. Antofagasta
5. Codelco

Section Suppliers:

1. British Steel
2. Tata Steel Europe
3. ArcelorMittal
4. Severfield
5. Barrett Steel

Please note that the list is based on industry reputation, market share, and relevance in each category.