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Linschotenstraat 8B - 3044 AW Rotterdam info@crownersservices.nl +31 10 30 30 070
Safety is a key priority in our operations
SCC* certified
Our employees and supervisors have comprehensive training in
health, safety and environmental practices.
This qualification ensures that our team can identify and manage
workplace hazards, implement safe work procedures and maintain the
highest standards of safety on every project, ensuring a secure
and responsible working environment for all.
EN 1090 EXC 4 certified
This certification means our work meets the highest standard
for safety and quality in steel and aluminum structures.
It’s the top level of assurance that what we build is
strong, reliable and trusted for critical projects.
ISO 26000 — Social responsibility
At Crowners we deliver high-quality metal construction and fabrication
with a commitment to the environment and renewable energy.
Guided by ISO 26000 social responsibility principles, we combine smart
production with sustainable practices — reducing waste, using recyclable
materials, and creating solutions that support a cleaner future.

Crowners is certified according to the following standards
Materials
Carbon Steel: ASTM A36, A516 Gr. 70, API 5L Gr. B, X42–X70
S355-S420_S460-S690-S860-S960
Stainless Steel: 304/304L, 316/316L, Duplex 2205, 1.4462, 1.4410, 1.4418
Alloy Steel: ASTM A387 Gr. 11/22, Cr-Mo steels
Structural Shapes: H-beams, I-beams, channels, angles (ASTM A572, A992)
Piping Materials: ASTM A106 Gr. B, A53, A333 (low temp), API 5L PSL1/PSL2
Aluminum Alloys: 5083, 6082
WPQR
Processes: SAW, SMAW, GTAW, GMAW, FCAW
Positions Qualified: 1G–6G (pipe), 1F–4F (plate)
Joint Types: Butt, fillet, groove, TKY joint, full / partial penetration
Thickness Range: Thin plate (3 mm) to heavy plate (up to 400 mm)
Filler Metals: E7018, E6010, ER70S-6, ER316L, E81T-1, ERNiCrMo-3
Codes & Standards: AWS D1.1, ASME Section IX, ISO 15614, API 1104, DNV-OS-C401, EN ISO 9606