Stainless for sensitive surroundings


Constructing a solid floor with non-magnetic material of which the MRI scanner will be placed, plus a zone of 85 centimeters around it.


The concrete floor is reinforced with Outokumpu’s non-magnetic, austenitic Core stainless steel.


Steel grade: Outokumpu Core 304LN/4311
Product form: Rebar

The western outskirts of Amsterdam host the Netherlands’ leading oncology center: the Antoni van Leeuwenhoek Hospital. Named after the ‘father of microbiology’, who in the seventeenth century made ground-breaking improvements to the microscope, this hospital is both a cancer research center and a clinic. So innovation is key to ensure the best treatments for patients. As such, for the renovation of the MRI (Magnetic Resonance Imaging) scanner room, the hospital looked for an efficient and durable way to construct the floor so that the reinforcement bars (rebar) won’t disrupt the magnetic-sensitive scanner.


A non-magnetic floor

Everything within a zone of 85 centimeters around the machine has to be non-magnetic, including the floor and its rebar. As for the rest of the floor, standard carbon steel bar would do the trick.

In order for this core part of the space to be free of any magnetism, engineer Jan van Vliet, the Director of J. van Vliet Vlechtwerken, was asked to provide a solution. “I didn’t have to think long,” he says. “I asked Outokumpu to provide non-magnetic steel rebar in quality Core 304LN/4311.” These rebar are stainless, which ensures low maintenance and low risk of carbonation. Outokumpu brought the hospital a very sustainable floor – which is much more appealing than the traditional method of using lead plates to cover the floor.


Perfect combination

Outokumpu supplied non-magnetic stainless rebar in 10 and 12mm diameter. Weighing a total of nine tonnes, the floor of the room in the Antoni van Leeuwenhoek Hospital contains 1.5 tonnes of Outokumpu rebar. Outokumpu already pre-cut and bent the rebar prior to delivering them to the hospital.

After the concrete was cast, the end result was one solid floor – ready to support the hospital’s vital machine that detects cancer: the MRI scanner.

Recommended products and insight

Building and infrastructure

Landmark buildings and bridges make a statement. When they’re built of stainless steel, that statement reflects an enduring legacy – a legacy of timeless beauty, exceptional strength and unmatched durability.

Structural applications

An inspired choice for load-bearing structures, stainless steel delivers exceptional strength with added benefits – like the corrosion resistance of steel in the Supra range, and light weight of high-strength duplex steel in the Forta range.


The Core range contains austenitic and ferritic stainless steel products for mild to medium corrosive environments. The classic 18/8 stainless steel is part of Outokumpu Core range.


Outokumpu offers a full range of stainless-steel rebar with high availability. 


Outokumpu's four value propositions: recycling maximized, nothing to hide, pays for itself and indispensability showcase Outokumpu's strengths, which answer to key sustainability needs. By selecting Outokumpu's stainless steel, our customers also benefit from these in their own sustainability efforts.