Safe, high-quality steel constructions made with precision

EN1090, EXC3 certified structures and welding

STH Steel offers certified steel constructions and steel work locally and worldwide, according to EN1090 execution class 3 (EXC3). We manufacture steel structures for the construction industry, and we are also an esteemed subcontractor of welded steel components for the manufacturing industry. Together with our customers, we develop high-quality, cost-efficient solutions to their challenges.

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Our services

We manufacture cost-efficient modules, demanding steel structures, and welded steel components, focusing on safety and flexible customer service.


Manufacturing of CE marked steel modules and steel frames as stand-alone units or part of larger factory plants.

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Welded steel components

Manual or robotic welding of steel components and steel machine frames.

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Advanced steel structures

We do not shy away from challenging projects. We have the skill and certificates to take on seemingly impossible tasks. Certification of material and welders according to EXC3 guarantees a safe result.

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Structural steel

Customised steel solutions, from design to installation. Site-built steel constructions, industrial steel buildings, and steel work.

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Certified steel solutions for demanding projects

STH Steel is the number one choice for durable and robust steel constructions. We have the certificates needed to offer high-quality products and safe execution.

EN 1090-1, EXC3

We have the knowledge and certificates to manufacture CE marked, load-bearing steel structures for the construction industry according to execution class EXC2 and EXC3.

ISO 9001:2015

The certificate ensures that STH Steel carries out quality controls to ensure that products, services, and customer service comply with established regulations and statutory requirements.

ISO 3834-2

STH Steel works according to extensive quality requirements for welding, in the factory and in the field, as defined in the certificate.

Our projects

Welding work for every level of difficulty

To us, steel is more than a material. It is an expression of our unyielding will and our creative ability to overcome obstacles. This approach guides us as we offer our steel solutions across country borders, installing them on high rooftops or deep down in the dark bedrock of the earth.

Wherever safe and professional steel structures are needed to sustain the needs of the industry and society, there you will find STH Steel.

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STH Steel

Challenges inspire us

With our extensive experience in the steel industry, we have attained the professional confidence needed to take on projects which, at first glance, seem impossible. Through challenging operations, we have developed the capability to carry out demanding projects.

Together with the customer, we take the time to develop detailed, high-quality solutions with safety as our guideline. Our strengths include flexibility, precision, delivery reliability and a highly skilled workforce. However, our main strength is our courage to take on demanding projects.

Despite high demands for precision and safety from customers, we have not yet encountered an impossible task. Contact us, and we will turn your visions into steel structures!

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