Start Your Next Chapter with 7 Steel UK (formerly CELSA STEEL UK)
About 7 Steel UK
Previously known as CELSA STEEL UK, the company was acquired by Sev.en Global Investments in 2025 and has been rebranded as 7 Steel UK. They are the nation’s leading producer of low-carbon, circular steel, continuing a long and proud legacy of steelmaking in South Wales. Their operations are divided into three main divisions: Manufacturing, Service, and Recycling.
From their cutting-edge facility in Cardiff, they have the capacity to produce up to 1.2 million tonnes of crude steel annually, supporting major infrastructure, energy, and construction projects across the UK and Ireland. At the heart of their operations is their Electric Arc Furnace — the cleanest and most energy-efficient steel production technology available, delivering up to 80% lower CO₂ emissions compared to traditional blast furnace methods.
They offer a diverse range of high-performance steel products engineered to meet the highest standards of quality, reliability, and sustainability. As 7 Steel UK, they remain committed to shaping a low-carbon future, one recycled tonne at a time.
Why Join 7 Steel UK?
Career Development
- Continuing a legacy as Cardiff’s largest manufacturing company, with over 600 permanent staff, they offer excellent prospects for promotion and career development.
- They have a proven track record of internal progression, with many team leaders and managers, who started with CELSA STEEL UK, now progressing within 7 Steel UK.
- They are an engineering-led company, employing around 120 technicians and engineers in Cardiff alone.
- They provide study support for qualifications like HNC/HND, with opportunities for further education to the degree level.
Health and Safety: Their Top Priority
- They are committed to achieving ZERO accidents and becoming the industry leader in safety. The health and safety of colleagues and partners are paramount.
- Their dedicated Health & Safety team has doubled in size to provide even greater support to the business.
- They have invested significantly in improving health & safety, including bespoke software for permit-to-work systems and contractor management, as well as refurbishing facilities.
Their Culture
- They believe in empowering colleagues and offer a high degree of autonomy, a value carried over from their time as CELSA STEEL UK.
- Their culture is close-knit and supportive, where colleagues are treated with respect and their views are valued.
- They foster a fast-paced, dynamic environment where you can make a real impact.
Sustainability and Community
- Their finished products contain 98% recycled content, made from 100% UK-sourced scrap metal.
- They recycle over 1 million tonnes of scrap a year, contributing to a circular economy.
- They are proud to be an “anchor company” in Wales, supporting local communities and skilled jobs.
- Learn more about their commitment on the 7 Steel UK reporting page.
Jobs & Careers at 7 Steel UK
7 Steel UK are always looking for talented individuals to join their team in various fields:
- Mechanical and electrical engineers and craftsmen
- Supply chain and logistics professionals (buyers, planners, transport planners, warehouse managers)
- Health and safety professionals
- Commercial professionals (administrators, customer service advisors)
- Production professionals (operators, supervisors, shift managers)
Interested in a job at 7 Steel UK? Submit your CV online here (Please put “7 Steel UK / CELSA” as the job reference number).
Their Cardiff Sites
Their world-class facilities in Cardiff continue to produce high-quality steel products under the new ownership of 7 Steel UK.
The Melt Shop – Tremorfa, Cardiff
Their steel is manufactured via the Electric Arc Furnace (EAF) route, meaning every tonne is made almost entirely from recycled scrap metal. The EAF can produce over 100 tonnes per hour, with an annual capacity of around 1,000,000 tonnes.
Rod & Bar Mill – Castle Works, Cardiff
The rod and bar mill produces 890,000 tonnes of reinforcing and wire rod products each year. A £10M investment in a four-line spooler mill made it the first UK mill to produce hot spooled coil, a vital process for achieving high-grade properties.
Section Mill – Tremorfa, Cardiff
The section mill produces 350,000 tonnes of merchant bar and sections, including angles, flats, and channels for the construction and fabrication industries.
How to Apply for Jobs at 7 Steel UK
- Submit a CV online (Please use “7 Steel UK / CELSA” as the job reference).
- Email your CV to ads@sigmarecruitment.co.uk.
- Call us on 02920 450100 to discuss current opportunities.
“I began recruiting for this organisation back in 2005 when it was CELSA STEEL UK. Over the years, I have seen first-hand its long-term commitment to steelmaking in Cardiff and its people. Now, as 7 Steel UK, the company is leading the charge in sustainable, circular steel production. It remains a fantastic place to build a career, offering the same stability and commitment to growth, combined with a forward-thinking vision for the industry. I have been consistently impressed with their dedication to recycling, continuous improvement, and responsible sourcing.”
Rhys Williams, Managing Director, Sigma Recruitment Ltd.
Find out more about Sigma Recruitment in Cardiff here.
